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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.09676">arXiv:2311.09676</a> <span> [<a href="https://arxiv.org/pdf/2311.09676">pdf</a>, <a href="https://arxiv.org/format/2311.09676">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2024.138846">10.1016/j.physletb.2024.138846 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for Charged Excited States of Dark Matter with KamLAND-Zen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=collaboration%2C+K">KamLAND-Zen collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Eizuka%2C+M">M. Eizuka</a>, <a href="/search/hep-ex?searchtype=author&query=Futagi%2C+S">S. Futagi</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+S">S. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Kurasawa%2C+M">M. Kurasawa</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">H. Miyake</a>, <a href="/search/hep-ex?searchtype=author&query=Morita%2C+D">D. Morita</a>, <a href="/search/hep-ex?searchtype=author&query=Nakahata%2C+T">T. Nakahata</a> , et al. (44 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.09676v2-abstract-short" style="display: inline;"> Particle dark matter could belong to a multiplet that includes an electrically charged state. WIMP dark matter ($蠂^{0}$) accompanied by a negatively charged excited state ($蠂^{-}$) with a small mass difference (e.g. $<$ 20 MeV) can form a bound-state with a nucleus such as xenon. This bound-state formation is rare and the released energy is $\mathcal{O}(1-10$) MeV depending on the nucleus, making… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.09676v2-abstract-full').style.display = 'inline'; document.getElementById('2311.09676v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.09676v2-abstract-full" style="display: none;"> Particle dark matter could belong to a multiplet that includes an electrically charged state. WIMP dark matter ($蠂^{0}$) accompanied by a negatively charged excited state ($蠂^{-}$) with a small mass difference (e.g. $<$ 20 MeV) can form a bound-state with a nucleus such as xenon. This bound-state formation is rare and the released energy is $\mathcal{O}(1-10$) MeV depending on the nucleus, making large liquid scintillator detectors suitable for detection. We searched for bound-state formation events with xenon in two experimental phases of the KamLAND-Zen experiment, a xenon-doped liquid scintillator detector. No statistically significant events were observed. For a benchmark parameter set of WIMP mass $m_{蠂^{0}} = 1$ TeV and mass difference $螖m = 17$ MeV, we set the most stringent upper limits on the recombination cross section times velocity $\langle蟽v\rangle$ and the decay-width of $蠂^{-}$ to $9.2 \times 10^{-30}$ ${\rm cm^3/s}$ and $8.7 \times 10^{-14}$ GeV, respectively at 90% confidence level. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.09676v2-abstract-full').style.display = 'none'; document.getElementById('2311.09676v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. B 855 (2024) 138846 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.09307">arXiv:2301.09307</a> <span> [<a href="https://arxiv.org/pdf/2301.09307">pdf</a>, <a href="https://arxiv.org/format/2301.09307">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Measurement of cosmic-ray muon spallation products in a xenon-loaded liquid scintillator with KamLAND </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KamLAND-Zen Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Asami%2C+S">S. Asami</a>, <a href="/search/hep-ex?searchtype=author&query=Eizuka%2C+M">M. Eizuka</a>, <a href="/search/hep-ex?searchtype=author&query=Futagi%2C+S">S. Futagi</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gima%2C+T">T. Gima</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+A">A. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Kurasawa%2C+M">M. Kurasawa</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Miyake%2C+H">H. Miyake</a> , et al. (42 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.09307v1-abstract-short" style="display: inline;"> Cosmic-ray muons produce various radioisotopes when passing through material. These spallation products can be backgrounds for rare event searches such as in solar neutrino, double-beta decay, and dark matter search experiments. The KamLAND-Zen experiment searches for neutrinoless double-beta decay in 745kg of xenon dissolved in liquid scintillator. The experiment includes dead-time-free electroni… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.09307v1-abstract-full').style.display = 'inline'; document.getElementById('2301.09307v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.09307v1-abstract-full" style="display: none;"> Cosmic-ray muons produce various radioisotopes when passing through material. These spallation products can be backgrounds for rare event searches such as in solar neutrino, double-beta decay, and dark matter search experiments. The KamLAND-Zen experiment searches for neutrinoless double-beta decay in 745kg of xenon dissolved in liquid scintillator. The experiment includes dead-time-free electronics with a high efficiency for detecting muon-induced neutrons. The production yields of different radioisotopes are measured with a combination of delayed coincidence techniques, newly developed muon reconstruction and xenon spallation identification methods. The observed xenon spallation products are consistent with results from the FLUKA and Geant4 simulation codes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.09307v1-abstract-full').style.display = 'none'; document.getElementById('2301.09307v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.02139">arXiv:2203.02139</a> <span> [<a href="https://arxiv.org/pdf/2203.02139">pdf</a>, <a href="https://arxiv.org/format/2203.02139">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.130.051801">10.1103/PhysRevLett.130.051801 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KamLAND-Zen Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Asami%2C+S">S. Asami</a>, <a href="/search/hep-ex?searchtype=author&query=Eizuka%2C+M">M. Eizuka</a>, <a href="/search/hep-ex?searchtype=author&query=Futagi%2C+S">S. Futagi</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gima%2C+T">T. Gima</a>, <a href="/search/hep-ex?searchtype=author&query=Goto%2C+A">A. Goto</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ichimura%2C+K">K. Ichimura</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kawada%2C+N">N. Kawada</a>, <a href="/search/hep-ex?searchtype=author&query=Kishimoto%2C+Y">Y. Kishimoto</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Kurasawa%2C+M">M. Kurasawa</a>, <a href="/search/hep-ex?searchtype=author&query=Maemura%2C+N">N. Maemura</a> , et al. (50 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.02139v2-abstract-short" style="display: inline;"> The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta ($0谓尾尾$) decay half-life in $^{136}$Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of $^{136}$Xe. These new data provide valuable… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.02139v2-abstract-full').style.display = 'inline'; document.getElementById('2203.02139v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.02139v2-abstract-full" style="display: none;"> The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta ($0谓尾尾$) decay half-life in $^{136}$Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of $^{136}$Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. We obtain a lower limit for the $0谓尾尾$ decay half-life of $T_{1/2}^{0谓} > 2.3 \times 10^{26}$ yr at 90% C.L., corresponding to upper limits on the effective Majorana neutrino mass of 36-156 meV using commonly adopted nuclear matrix element calculations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.02139v2-abstract-full').style.display = 'none'; document.getElementById('2203.02139v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 130, 051801 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.10452">arXiv:2104.10452</a> <span> [<a href="https://arxiv.org/pdf/2104.10452">pdf</a>, <a href="https://arxiv.org/format/2104.10452">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/16/08/p08023">10.1088/1748-0221/16/08/p08023 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The nylon balloon for xenon loaded liquid scintillator in KamLAND-Zen 800 neutrinoless double-beta decay search experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=collaboration%2C+K">KamLAND-Zen collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Hosokawa%2C+K">K. Hosokawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Nakada%2C+T">T. Nakada</a>, <a href="/search/hep-ex?searchtype=author&query=Obara%2C+S">S. Obara</a>, <a href="/search/hep-ex?searchtype=author&query=Ozaki%2C+H">H. Ozaki</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Ueshima%2C+K">K. Ueshima</a>, <a href="/search/hep-ex?searchtype=author&query=Watanabe%2C+H">H. Watanabe</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+S">S. Abe</a>, <a href="/search/hep-ex?searchtype=author&query=Hata%2C+K">K. Hata</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashi%2C+A">A. Hayashi</a>, <a href="/search/hep-ex?searchtype=author&query=Honda%2C+Y">Y. Honda</a>, <a href="/search/hep-ex?searchtype=author&query=Ieki%2C+S">S. Ieki</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Ishikawa%2C+S">S. Ishikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Kamei%2C+Y">Y. Kamei</a>, <a href="/search/hep-ex?searchtype=author&query=Kamizawa%2C+K">K. Kamizawa</a> , et al. (49 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2104.10452v3-abstract-short" style="display: inline;"> The KamLAND-Zen 800 experiment is searching for the neutrinoless double-beta decay of $^{136}$Xe by using $^{136}$Xe-loaded liquid scintillator. The liquid scintillator is enclosed inside a balloon made of thin, transparent, low-radioactivity film that we call Inner Balloon (IB). The IB, apart from guaranteeing the liquid containment, also allows to minimize the background from cosmogenic muon-spa… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.10452v3-abstract-full').style.display = 'inline'; document.getElementById('2104.10452v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.10452v3-abstract-full" style="display: none;"> The KamLAND-Zen 800 experiment is searching for the neutrinoless double-beta decay of $^{136}$Xe by using $^{136}$Xe-loaded liquid scintillator. The liquid scintillator is enclosed inside a balloon made of thin, transparent, low-radioactivity film that we call Inner Balloon (IB). The IB, apart from guaranteeing the liquid containment, also allows to minimize the background from cosmogenic muon-spallation products and $^{8}$B solar neutrinos. Indeed these events could contribute to the total counts in the region of interest around the Q-value of the double-beta decay of $^{136}$Xe. In this paper, we present an overview of the IB and describe the various steps of its commissioning minimizing the radioactive contaminations, from the material selection, to the fabrication of the balloon and its installation inside the KamLAND detector. Finally, we show the impact of the IB on the KamLAND background as measured by the KamLAND detector itself. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.10452v3-abstract-full').style.display = 'none'; document.getElementById('2104.10452v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 June, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 16 figures, to be submitted to JINST</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> 2021 JINST 16 P08023 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1906.02357">arXiv:1906.02357</a> <span> [<a href="https://arxiv.org/pdf/1906.02357">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Write-ups for workshop on the project for the hadron experimental facility of J-PARC, Partial collection of LOIs at the extended hadron hall and the related topics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Association%2C+H+H+U">Hadron Hall Users' Association</a>, <a href="/search/hep-ex?searchtype=author&query=Achenbach%2C+P">P. Achenbach</a>, <a href="/search/hep-ex?searchtype=author&query=Ahn%2C+J+K">J. K. Ahn</a>, <a href="/search/hep-ex?searchtype=author&query=Ajimura%2C+S">S. Ajimura</a>, <a href="/search/hep-ex?searchtype=author&query=Akaishi%2C+T">T. Akaishi</a>, <a href="/search/hep-ex?searchtype=author&query=Akaishi%2C+Y">Y. Akaishi</a>, <a href="/search/hep-ex?searchtype=author&query=Andersson%2C+W+I">W. Ikegami Andersson</a>, <a href="/search/hep-ex?searchtype=author&query=Aoki%2C+K">K. Aoki</a>, <a href="/search/hep-ex?searchtype=author&query=Asano%2C+H">H. Asano</a>, <a href="/search/hep-ex?searchtype=author&query=Bleser%2C+S">S. Bleser</a>, <a href="/search/hep-ex?searchtype=author&query=Botta%2C+E">E. Botta</a>, <a href="/search/hep-ex?searchtype=author&query=B%C3%B6lting%2C+M">M. B枚lting</a>, <a href="/search/hep-ex?searchtype=author&query=Chang%2C+W">WC. Chang</a>, <a href="/search/hep-ex?searchtype=author&query=Feliciello%2C+A">A. Feliciello</a>, <a href="/search/hep-ex?searchtype=author&query=Fujioka%2C+H">H. Fujioka</a>, <a href="/search/hep-ex?searchtype=author&query=Hassanvand%2C+M">M. Hassanvand</a>, <a href="/search/hep-ex?searchtype=author&query=Honda%2C+R">R. Honda</a>, <a href="/search/hep-ex?searchtype=author&query=Ichikawa%2C+Y">Y. Ichikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ishikawa%2C+T">T. Ishikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Itahashi%2C+K">K. Itahashi</a>, <a href="/search/hep-ex?searchtype=author&query=Komatsu%2C+Y">Y. Komatsu</a>, <a href="/search/hep-ex?searchtype=author&query=Miwa%2C+K">K. Miwa</a>, <a href="/search/hep-ex?searchtype=author&query=Miyachi%2C+Y">Y. Miyachi</a>, <a href="/search/hep-ex?searchtype=author&query=Morino%2C+Y">Y. Morino</a>, <a href="/search/hep-ex?searchtype=author&query=Nakano%2C+T">T. Nakano</a> , et al. (27 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1906.02357v2-abstract-short" style="display: inline;"> This write-up document is a summary of International workshop on the project for the extended hadron experimental facility which was held from March 26 to 28, 2018 at KEK Tokai Campus. This document is a collection of Letter Of Intents (LOIs) related to the proposed beam lines in the extended hadron experimental facility at J-PARC. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1906.02357v2-abstract-full" style="display: none;"> This write-up document is a summary of International workshop on the project for the extended hadron experimental facility which was held from March 26 to 28, 2018 at KEK Tokai Campus. This document is a collection of Letter Of Intents (LOIs) related to the proposed beam lines in the extended hadron experimental facility at J-PARC. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1906.02357v2-abstract-full').style.display = 'none'; document.getElementById('1906.02357v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1901.03871">arXiv:1901.03871</a> <span> [<a href="https://arxiv.org/pdf/1901.03871">pdf</a>, <a href="https://arxiv.org/format/1901.03871">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Theory">nucl-th</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.122.192501">10.1103/PhysRevLett.122.192501 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Precision Analysis of the $^{136}$Xe Two-Neutrino $尾尾$ Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KamLAND-Zen Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1901.03871v2-abstract-short" style="display: inline;"> We present a precision analysis of the $^{136}$Xe two-neutrino $尾尾$ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino $尾尾$ rate allows us to measure the ratio of the leading and subleading $2谓尾尾$ nuclear matrix elements (NMEs), $尉^{2谓}_{31} = -0.26^{+0.31}_{-0.25}$. Theoretical predictions from the nu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.03871v2-abstract-full').style.display = 'inline'; document.getElementById('1901.03871v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1901.03871v2-abstract-full" style="display: none;"> We present a precision analysis of the $^{136}$Xe two-neutrino $尾尾$ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino $尾尾$ rate allows us to measure the ratio of the leading and subleading $2谓尾尾$ nuclear matrix elements (NMEs), $尉^{2谓}_{31} = -0.26^{+0.31}_{-0.25}$. Theoretical predictions from the nuclear shell model and the majority of the quasiparticle random-phase approximation (QRPA) calculations are consistent with the experimental limit. However, part of the $尉^{2谓}_{31}$ range allowed by the QRPA is excluded by the present measurement at the 90% confidence level. Our analysis reveals that predicted $尉^{2谓}_{31}$ values are sensitive to the quenching of NMEs and the competing contributions from low- and high-energy states in the intermediate nucleus. Since these aspects are also at play in neutrinoless $尾尾$ decay, $尉^{2谓}_{31}$ provides new insights towards reliable neutrinoless $尾尾$ NMEs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1901.03871v2-abstract-full').style.display = 'none'; document.getElementById('1901.03871v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> INT-PUB-19-001 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 122, 192501 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1807.02691">arXiv:1807.02691</a> <span> [<a href="https://arxiv.org/pdf/1807.02691">pdf</a>, <a href="https://arxiv.org/format/1807.02691">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2018.08.012">10.1016/j.physletb.2018.08.012 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Combined limit on the production of a light gauge boson decaying into $渭^+渭^-$ and $蟺^+蟺^-$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KLOE-2 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Anastasi%2C+A">A. Anastasi</a>, <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Berlowski%2C+M">M. Berlowski</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Cao%2C+B">B. Cao</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Curciarello%2C+F">F. Curciarello</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/hep-ex?searchtype=author&query=D%27Agostinio%2C+G">G. D'Agostinio</a>, <a href="/search/hep-ex?searchtype=author&query=Dan%C3%A9%2C+E">E. Dan茅</a>, <a href="/search/hep-ex?searchtype=author&query=De+Leo%2C+V">V. De Leo</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Simone%2C+P">P. De Simone</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Cicco%2C+A">A. Di Cicco</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Domenici%2C+D">D. Domenici</a>, <a href="/search/hep-ex?searchtype=author&query=D%27Uffizi%2C+A">A. D'Uffizi</a>, <a href="/search/hep-ex?searchtype=author&query=Fantini%2C+A">A. Fantini</a> , et al. (35 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1807.02691v2-abstract-short" style="display: inline;"> We searched for the $渭^+渭^-$ decay of a light vector gauge boson, also known as dark photon, in the $e^+ e^- \to 渭^+ 渭^- 纬_{\rm ISR}$ process by means of the Initial State Radiation (ISR) method. We used 1.93~fb$^{-1}$ of data collected by the KLOE experiment at the DA$桅$NE $蠁$-factory. No structures have been observed over the irreducible $渭^+ 渭^-$ background. A 90\% CL limit on the ratio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.02691v2-abstract-full').style.display = 'inline'; document.getElementById('1807.02691v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1807.02691v2-abstract-full" style="display: none;"> We searched for the $渭^+渭^-$ decay of a light vector gauge boson, also known as dark photon, in the $e^+ e^- \to 渭^+ 渭^- 纬_{\rm ISR}$ process by means of the Initial State Radiation (ISR) method. We used 1.93~fb$^{-1}$ of data collected by the KLOE experiment at the DA$桅$NE $蠁$-factory. No structures have been observed over the irreducible $渭^+ 渭^-$ background. A 90\% CL limit on the ratio $\varepsilon^2=伪^{\prime}/伪$ between the dark coupling constant and the fine structure constant of $ 3\times 10^{-6}-2\times 10^{-7}$ has been set in the dark photon mass region between 519 MeV and 973 MeV. This new limit has been combined with the published result obtained investigating the hypothesis of the dark photon decaying into hadrons in $e^+ e^- \to 蟺^+ 蟺^- 纬_{\rm ISR}$ events. The combined 90\% CL limit increases the sensitivity especially in the $蟻-蠅$ interference region and excludes $\varepsilon^2$ greater than $(13-2)\times 10^{-7}$. For dark photon masses greater than 600 MeV the combined limit is lower than 8~$\times\, 10^{-7}$ resulting more stringent than present constraints from other experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.02691v2-abstract-full').style.display = 'none'; document.getElementById('1807.02691v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 7 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 9 figures, 1 table, accepted for publication in Physics Letters B</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physics Letters B 784 (2018), 336 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1711.03085">arXiv:1711.03085</a> <span> [<a href="https://arxiv.org/pdf/1711.03085">pdf</a>, <a href="https://arxiv.org/format/1711.03085">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> Combination of KLOE $蟽\big(e^+e^-\rightarrow蟺^+蟺^-纬(纬)\big)$ measurements and determination of $a_渭^{蟺^+蟺^-}$ in the energy range $0.10 < s < 0.95$ GeV$^2$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+T+K">The KLOE-2 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Anastasi%2C+A">A. Anastasi</a>, <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Berlowski%2C+M">M. Berlowski</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Balkest%C3%A5hl%2C+L+C">L. Caldeira Balkest氓hl</a>, <a href="/search/hep-ex?searchtype=author&query=Cao%2C+B">B. Cao</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Curciarello%2C+F">F. Curciarello</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/hep-ex?searchtype=author&query=D%27Agostini%2C+G">G. D'Agostini</a>, <a href="/search/hep-ex?searchtype=author&query=Dan%C3%A8%2C+E">E. Dan猫</a>, <a href="/search/hep-ex?searchtype=author&query=De+Leo%2C+V">V. De Leo</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Simone%2C+P">P. De Simone</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Cicco%2C+A">A. Di Cicco</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Domenici%2C+D">D. Domenici</a>, <a href="/search/hep-ex?searchtype=author&query=D%27Uffizi%2C+A">A. D'Uffizi</a> , et al. (41 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1711.03085v2-abstract-short" style="display: inline;"> The three precision measurements of the cross section $蟽\big(e^+e^-\rightarrow蟺^+蟺^-纬(纬)\big)$ using initial state radiation by the KLOE collaboration provide an important input for the prediction of the hadronic contribution to the anomalous magnetic moment of the muon. These measurements are correlated for both statistical and systematic uncertainties and, therefore, the simultaneous use of thes… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.03085v2-abstract-full').style.display = 'inline'; document.getElementById('1711.03085v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1711.03085v2-abstract-full" style="display: none;"> The three precision measurements of the cross section $蟽\big(e^+e^-\rightarrow蟺^+蟺^-纬(纬)\big)$ using initial state radiation by the KLOE collaboration provide an important input for the prediction of the hadronic contribution to the anomalous magnetic moment of the muon. These measurements are correlated for both statistical and systematic uncertainties and, therefore, the simultaneous use of these measurements requires covariance matrices that fully describe the correlations. We present the construction of these covariance matrices and use them to determine a combined KLOE measurement for $蟽\big(e^+e^-\rightarrow蟺^+蟺^-纬(纬)\big)$. We find, from this combination, a two-pion contribution to the muon magnetic anomaly in the energy range $0.10 < s < 0.95$ GeV$^2$ of $a_渭^{蟺^+蟺^-} = (489.8 \pm 1.7_{\rm stat} \pm 4.8_{\rm sys} ) \times 10^{-10}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1711.03085v2-abstract-full').style.display = 'none'; document.getElementById('1711.03085v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 November, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">20 pages, 8 figures. Version as published in JHEP 1803 (2018) 173</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1609.06631">arXiv:1609.06631</a> <span> [<a href="https://arxiv.org/pdf/1609.06631">pdf</a>, <a href="https://arxiv.org/format/1609.06631">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2016.12.016">10.1016/j.physletb.2016.12.016 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the running of the fine structure constant below 1 GeV with the KLOE Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+T+K">The KLOE-2 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Anastasi%2C+A">A. Anastasi</a>, <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Bencivenni%2C+G">G. Bencivenni</a>, <a href="/search/hep-ex?searchtype=author&query=Berlowski%2C+M">M. Berlowski</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Balkest%C3%A5hl%2C+L+C">L. Caldeira Balkest氓hl</a>, <a href="/search/hep-ex?searchtype=author&query=Cao%2C+B">B. Cao</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Curciarello%2C+F">F. Curciarello</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/hep-ex?searchtype=author&query=D%27Agostini%2C+G">G. D'Agostini</a>, <a href="/search/hep-ex?searchtype=author&query=Dan%C3%A9%2C+E">E. Dan茅</a>, <a href="/search/hep-ex?searchtype=author&query=De+Leo%2C+V">V. De Leo</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Simone%2C+P">P. De Simone</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Cicco%2C+A">A. Di Cicco</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Salvo%2C+R">R. Di Salvo</a> , et al. (42 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1609.06631v2-abstract-short" style="display: inline;"> We have measured the running of the effective QED coupling constant $伪(s)$ in the time-like region $0.6<\sqrt s< 0.975$ GeV with the KLOE detector at DA$桅$NE using the Initial State Radiation process $e^+e^-\to渭^+ 渭^-纬$. It represents the first measurement of the running of $伪(s)$ in this energy region. Our results show a more than 5$蟽$ significance of the hadronic contribution to the running of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.06631v2-abstract-full').style.display = 'inline'; document.getElementById('1609.06631v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1609.06631v2-abstract-full" style="display: none;"> We have measured the running of the effective QED coupling constant $伪(s)$ in the time-like region $0.6<\sqrt s< 0.975$ GeV with the KLOE detector at DA$桅$NE using the Initial State Radiation process $e^+e^-\to渭^+ 渭^-纬$. It represents the first measurement of the running of $伪(s)$ in this energy region. Our results show a more than 5$蟽$ significance of the hadronic contribution to the running of $伪(s)$, which is the strongest direct evidence both in time- and space-like regions achieved in a single measurement. By using the $e^+e^-\to蟺^+蟺^-$ cross section measured by KLOE, the real and imaginary part of the shift $螖伪(s)$ has been extracted. By a fit of the real part of $螖伪(s)$ and assuming the lepton universality the branching ratio $BR(蠅\to渭^+渭^-) = (6.6\pm1.4_{stat}\pm1.7_{syst})\cdot 10^{-5} $ has been determined. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.06631v2-abstract-full').style.display = 'none'; document.getElementById('1609.06631v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 8 figures, version accepted for publication in Phys. Lett. B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1605.02889">arXiv:1605.02889</a> <span> [<a href="https://arxiv.org/pdf/1605.02889">pdf</a>, <a href="https://arxiv.org/ps/1605.02889">ps</a>, <a href="https://arxiv.org/format/1605.02889">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.117.082503">10.1103/PhysRevLett.117.082503 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for Majorana Neutrinos near the Inverted Mass Hierarchy Region with KamLAND-Zen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KamLAND-Zen Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1605.02889v2-abstract-short" style="display: inline;"> We present an improved search for neutrinoless double-beta ($0谓尾尾$) decay of $^{136}$Xe in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the $^{110m}$Ag contaminant identified in previous searches. Combining the results from the first and second phase, we obtain a lower limit for the $0谓尾尾$ decay half-life of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.02889v2-abstract-full').style.display = 'inline'; document.getElementById('1605.02889v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1605.02889v2-abstract-full" style="display: none;"> We present an improved search for neutrinoless double-beta ($0谓尾尾$) decay of $^{136}$Xe in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the $^{110m}$Ag contaminant identified in previous searches. Combining the results from the first and second phase, we obtain a lower limit for the $0谓尾尾$ decay half-life of $T_{1/2}^{0谓} > 1.07 \times 10^{26}$ yr at 90% C.L., an almost sixfold improvement over previous limits. Using commonly adopted nuclear matrix element calculations, the corresponding upper limits on the effective Majorana neutrino mass are in the range 61-165 meV. For the most optimistic nuclear matrix elements, this limit reaches the bottom of the quasi-degenerate neutrino mass region. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.02889v2-abstract-full').style.display = 'none'; document.getElementById('1605.02889v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 July, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures, the results were updated based on the revised estimation of the 137Xe background</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Lett. 117, 082503 (2016) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1603.06086">arXiv:1603.06086</a> <span> [<a href="https://arxiv.org/pdf/1603.06086">pdf</a>, <a href="https://arxiv.org/format/1603.06086">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2016.04.019">10.1016/j.physletb.2016.04.019 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Limit on the production of a new vector boson in $\mathrm{e^+ e^-}\rightarrow {\rm U}纬$, U$\rightarrow 蟺^+蟺^-$ with the KLOE experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KLOE-2 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Anastasi%2C+A">A. Anastasi</a>, <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Bencivenni%2C+G">G. Bencivenni</a>, <a href="/search/hep-ex?searchtype=author&query=Berlowski%2C+M">M. Berlowski</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Balkest%C3%A5hl%2C+L+C">L. Caldeira Balkest氓hl</a>, <a href="/search/hep-ex?searchtype=author&query=Cao%2C+B">B. Cao</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Curciarello%2C+F">F. Curciarello</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/hep-ex?searchtype=author&query=D%27Agostini%2C+G">G. D'Agostini</a>, <a href="/search/hep-ex?searchtype=author&query=Dan%C3%A8%2C+E">E. Dan猫</a>, <a href="/search/hep-ex?searchtype=author&query=De+Leo%2C+V">V. De Leo</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Simone%2C+P">P. De Simone</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Cicco%2C+A">A. Di Cicco</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Salvo%2C+R">R. Di Salvo</a> , et al. (41 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1603.06086v1-abstract-short" style="display: inline;"> The recent interest in a light gauge boson in the framework of an extra U(1) symmetry motivates searches in the mass range below 1 GeV. We present a search for such a particle, the dark photon, in ${\rm e^+ e^-}\rightarrow {\rm U}纬$, U$\rightarrow 蟺^+蟺^-$ based on 28 million $\mathrm{e^+ e^-} \rightarrow 蟺^+ 蟺^-纬$ events collected at DA$桅$NE by the KLOE experiment. The $蟺^+ 蟺^-$ production by in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.06086v1-abstract-full').style.display = 'inline'; document.getElementById('1603.06086v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1603.06086v1-abstract-full" style="display: none;"> The recent interest in a light gauge boson in the framework of an extra U(1) symmetry motivates searches in the mass range below 1 GeV. We present a search for such a particle, the dark photon, in ${\rm e^+ e^-}\rightarrow {\rm U}纬$, U$\rightarrow 蟺^+蟺^-$ based on 28 million $\mathrm{e^+ e^-} \rightarrow 蟺^+ 蟺^-纬$ events collected at DA$桅$NE by the KLOE experiment. The $蟺^+ 蟺^-$ production by initial-state radiation compensates for a loss of sensitivity of previous KLOE ${\rm U} \rightarrow \mathrm{e^+ e^-}$, $渭^+渭^-$ searches due to the small branching ratios in the $蟻-蠅$ resonance region. We found no evidence for a signal and set a limit at 90\% CL on the mixing strength between the photon and the dark photon, $\varepsilon^2$, in the U mass range between $527$ and $987$~MeV. Above 700 MeV this new limit is more stringent than previous ones. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1603.06086v1-abstract-full').style.display = 'none'; document.getElementById('1603.06086v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 March, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 9 figures, 1 table, submitted to Phys. Lett. B</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physics Letters B 757 (2016) pp. 356-361 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1601.06985">arXiv:1601.06985</a> <span> [<a href="https://arxiv.org/pdf/1601.06985">pdf</a>, <a href="https://arxiv.org/format/1601.06985">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Precision measurement of the $畏\to蟺^+蟺^-蟺^0$ Dalitz plot distribution with the KLOE detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KLOE-2 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Anastasi%2C+A">A. Anastasi</a>, <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Bencivenni%2C+G">G. Bencivenni</a>, <a href="/search/hep-ex?searchtype=author&query=Berlowski%2C+M">M. Berlowski</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Balkest%C3%A5hl%2C+L+C">L. Caldeira Balkest氓hl</a>, <a href="/search/hep-ex?searchtype=author&query=Cao%2C+B">B. Cao</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Curciarello%2C+F">F. Curciarello</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/hep-ex?searchtype=author&query=D%27Agostini%2C+G">G. D'Agostini</a>, <a href="/search/hep-ex?searchtype=author&query=Dan%C3%A9%2C+E">E. Dan茅</a>, <a href="/search/hep-ex?searchtype=author&query=De+Leo%2C+V">V. De Leo</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Simone%2C+P">P. De Simone</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Cicco%2C+A">A. Di Cicco</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Salvo%2C+R">R. Di Salvo</a> , et al. (40 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1601.06985v1-abstract-short" style="display: inline;"> Using $1.6$ fb$^{-1}$ of $e^+ e^-\to蠁\to畏纬$ data collected with the KLOE detector at DA$桅$NE, the Dalitz plot distribution for the $畏\to 蟺^+ 蟺^- 蟺^0$ decay is studied with the world's largest sample of $\sim 4.7 \cdot 10^6$ events. The Dalitz plot density is parametrized as a polynomial expansion up to cubic terms in the normalized dimensionless variables $X$ and $Y$. The experiment is sensitive t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.06985v1-abstract-full').style.display = 'inline'; document.getElementById('1601.06985v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1601.06985v1-abstract-full" style="display: none;"> Using $1.6$ fb$^{-1}$ of $e^+ e^-\to蠁\to畏纬$ data collected with the KLOE detector at DA$桅$NE, the Dalitz plot distribution for the $畏\to 蟺^+ 蟺^- 蟺^0$ decay is studied with the world's largest sample of $\sim 4.7 \cdot 10^6$ events. The Dalitz plot density is parametrized as a polynomial expansion up to cubic terms in the normalized dimensionless variables $X$ and $Y$. The experiment is sensitive to all charge conjugation conserving terms of the expansion, including a $gX^2Y$ term. The statistical uncertainty of all parameters is improved by a factor two with respect to earlier measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.06985v1-abstract-full').style.display = 'none'; document.getElementById('1601.06985v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 26 January, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 9 figures, supplement: an ascii table</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1601.06565">arXiv:1601.06565</a> <span> [<a href="https://arxiv.org/pdf/1601.06565">pdf</a>, <a href="https://arxiv.org/ps/1601.06565">ps</a>, <a href="https://arxiv.org/format/1601.06565">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2016.04.015">10.1016/j.physletb.2016.04.015 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the $蠁\to 蟺^0 e^+e^-$ transition form factor with the KLOE detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KLOE-2 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Anastasi%2C+A">A. Anastasi</a>, <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Bencivenni%2C+G">G. Bencivenni</a>, <a href="/search/hep-ex?searchtype=author&query=Berlowski%2C+M">M. Berlowski</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Balkest%C3%A5hl%2C+L+C">L. Caldeira Balkest氓hl</a>, <a href="/search/hep-ex?searchtype=author&query=Cao%2C+B">B. Cao</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Curciarello%2C+F">F. Curciarello</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwi%C5%84ski%2C+E">E. Czerwi艅ski</a>, <a href="/search/hep-ex?searchtype=author&query=D%27Agostini%2C+G">G. D'Agostini</a>, <a href="/search/hep-ex?searchtype=author&query=Dan%C3%A8%2C+E">E. Dan猫</a>, <a href="/search/hep-ex?searchtype=author&query=De+Leo%2C+V">V. De Leo</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Simone%2C+P">P. De Simone</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Cicco%2C+A">A. Di Cicco</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Salvo%2C+R">R. Di Salvo</a> , et al. (40 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1601.06565v2-abstract-short" style="display: inline;"> A measurement of the vector to pseudoscalar conversion decay $蠁\to 蟺^0 e^+e^-$ with the KLOE experiment is presented. A sample of $\sim 9500$ signal events was selected from a data set of 1.7 fb$^{-1}$ of $e^+e^-$ collisions at $\sqrt{s} \sim m_蠁$ collected at the DA$桅$NE $e^+e^-$ collider. These events were used to obtain the first measurement of the transition form factor $| F_{蠁蟺^0}(q^2) |$ and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.06565v2-abstract-full').style.display = 'inline'; document.getElementById('1601.06565v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1601.06565v2-abstract-full" style="display: none;"> A measurement of the vector to pseudoscalar conversion decay $蠁\to 蟺^0 e^+e^-$ with the KLOE experiment is presented. A sample of $\sim 9500$ signal events was selected from a data set of 1.7 fb$^{-1}$ of $e^+e^-$ collisions at $\sqrt{s} \sim m_蠁$ collected at the DA$桅$NE $e^+e^-$ collider. These events were used to obtain the first measurement of the transition form factor $| F_{蠁蟺^0}(q^2) |$ and a new measurement of the branching ratio of the decay: $\rm{BR}\,(蠁\to 蟺^0 e^+e^-) = (\,1.35 \pm 0.05^{\,\,+0.05}_{\,\,-0.10}\,) \times 10 ^{-5}$. The result improves significantly on previous measurements and is in agreement with theoretical predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.06565v2-abstract-full').style.display = 'none'; document.getElementById('1601.06565v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 January, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 4 figures; matches published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. B 757 (2016) 362 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1509.03724">arXiv:1509.03724</a> <span> [<a href="https://arxiv.org/pdf/1509.03724">pdf</a>, <a href="https://arxiv.org/ps/1509.03724">ps</a>, <a href="https://arxiv.org/format/1509.03724">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nuclphysa.2015.11.011">10.1016/j.nuclphysa.2015.11.011 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KamLAND-Zen Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Asakura%2C+K">K. Asakura</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Hachiya%2C+T">T. Hachiya</a>, <a href="/search/hep-ex?searchtype=author&query=Hayashida%2C+S">S. Hayashida</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Ishidoshiro%2C+K">K. Ishidoshiro</a>, <a href="/search/hep-ex?searchtype=author&query=Ishikawa%2C+T">T. Ishikawa</a>, <a href="/search/hep-ex?searchtype=author&query=Ishio%2C+S">S. Ishio</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+S">S. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Motoki%2C+D">D. Motoki</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Obara%2C+S">S. Obara</a>, <a href="/search/hep-ex?searchtype=author&query=Otani%2C+M">M. Otani</a>, <a href="/search/hep-ex?searchtype=author&query=Oura%2C+T">T. Oura</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+I">I. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shirahata%2C+Y">Y. Shirahata</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a>, <a href="/search/hep-ex?searchtype=author&query=Tachibana%2C+H">H. Tachibana</a> , et al. (21 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1509.03724v2-abstract-short" style="display: inline;"> A search for double-beta decays of 136Xe to excited states of 136Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The 0+1, 2+1 and 2+2 transitions of 0谓\{beta}\{beta} decay were evaluated in an exposure of 89.5kg-yr of 136Xe, while the same transitions of 2谓\{beta}\{beta} decay were evaluated in an exposure of 61.8kg-yr. No excess over background was found for all… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.03724v2-abstract-full').style.display = 'inline'; document.getElementById('1509.03724v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1509.03724v2-abstract-full" style="display: none;"> A search for double-beta decays of 136Xe to excited states of 136Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The 0+1, 2+1 and 2+2 transitions of 0谓\{beta}\{beta} decay were evaluated in an exposure of 89.5kg-yr of 136Xe, while the same transitions of 2谓\{beta}\{beta} decay were evaluated in an exposure of 61.8kg-yr. No excess over background was found for all decay modes. The lower half-life limits of the 2+1 state transitions of 0谓\{beta}\{beta} and 2谓\{beta}\{beta} decay were improved to T(0谓, 0+ \rightarrow 2+) > 2.6\times10^25 yr and T(2谓, 0+ \rightarrow 2+) > 4.6\times10^23 yr (90% C.L.), respectively. We report on the first experimental lower half-life limits for the transitions to the 0+1 state of 136Xe for 0谓\{beta}\{beta} and 2谓\{beta}\{beta} decay. They are T (0谓, 0+ \rightarrow 0+) > 2.4\times10^25 yr and T(2谓, 0+ \rightarrow 0+) > 8.3\times10^23 yr (90% C.L.). The transitions to the 2+2 states are also evaluated for the first time to be T(0谓, 0+ \rightarrow 2+) > 2.6\times10^25 yr and T(2谓, 0+ \rightarrow 2+) > 9.0\times10^23 yr (90% C.L.). These results are compared to recent theoretical predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.03724v2-abstract-full').style.display = 'none'; document.getElementById('1509.03724v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 December, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 September, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 4 figures. Published in Nuclear Physics A</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.06795">arXiv:1501.06795</a> <span> [<a href="https://arxiv.org/pdf/1501.06795">pdf</a>, <a href="https://arxiv.org/ps/1501.06795">ps</a>, <a href="https://arxiv.org/format/1501.06795">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2015.06.015">10.1016/j.physletb.2015.06.015 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for dark Higgsstrahlung in e+ e- -> mu+ mu- and missing energy events with the KLOE experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KLOE-2 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Bencivenni%2C+G">G. Bencivenni</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Balkestahl%2C+L+C">L. Caldeira Balkestahl</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Curciarello%2C+F">F. Curciarello</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/hep-ex?searchtype=author&query=Dane%27%2C+E">E. Dane'</a>, <a href="/search/hep-ex?searchtype=author&query=De+Leo%2C+V">V. De Leo</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Simone%2C+P">P. De Simone</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Cicco%2C+A">A. Di Cicco</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Salvo%2C+R">R. Di Salvo</a>, <a href="/search/hep-ex?searchtype=author&query=Domenici%2C+D">D. Domenici</a>, <a href="/search/hep-ex?searchtype=author&query=Fantini%2C+A">A. Fantini</a>, <a href="/search/hep-ex?searchtype=author&query=Felici%2C+G">G. Felici</a>, <a href="/search/hep-ex?searchtype=author&query=Fiore%2C+S">S. Fiore</a> , et al. (34 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1501.06795v1-abstract-short" style="display: inline;"> We searched for evidence of a Higgsstrahlung process in a secluded sector, leading to a final state with a dark photon U and a dark Higgs boson h', with the KLOE detector at DAFNE. We investigated the case of h' lighter than U, with U decaying into a muon pair and h' producing a missing energy signature. We found no evidence of the process and set upper limits to its parameters in the range 2m_mu<… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.06795v1-abstract-full').style.display = 'inline'; document.getElementById('1501.06795v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.06795v1-abstract-full" style="display: none;"> We searched for evidence of a Higgsstrahlung process in a secluded sector, leading to a final state with a dark photon U and a dark Higgs boson h', with the KLOE detector at DAFNE. We investigated the case of h' lighter than U, with U decaying into a muon pair and h' producing a missing energy signature. We found no evidence of the process and set upper limits to its parameters in the range 2m_mu<m_U<1000 MeV, m_h'<m_U. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.06795v1-abstract-full').style.display = 'none'; document.getElementById('1501.06795v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 7 figures, submitted to Physics Letters B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1409.0077">arXiv:1409.0077</a> <span> [<a href="https://arxiv.org/pdf/1409.0077">pdf</a>, <a href="https://arxiv.org/ps/1409.0077">ps</a>, <a href="https://arxiv.org/format/1409.0077">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Results from KamLAND-Zen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+T+K">The KamLAND-Zen Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1409.0077v1-abstract-short" style="display: inline;"> KamLAND-Zen reports on a preliminary search for neutrinoless double-beta decay with ^{136}Xe based on 114.8 live-days after the purification of the xenon loaded liquid scintillator. In this data, the problematic ^{110m}Ag background peak identified in previous searches is reduced by more than a factor of 10. By combining the KamLAND-Zen pre- and post-purification data, we obtain a preliminary lowe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.0077v1-abstract-full').style.display = 'inline'; document.getElementById('1409.0077v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1409.0077v1-abstract-full" style="display: none;"> KamLAND-Zen reports on a preliminary search for neutrinoless double-beta decay with ^{136}Xe based on 114.8 live-days after the purification of the xenon loaded liquid scintillator. In this data, the problematic ^{110m}Ag background peak identified in previous searches is reduced by more than a factor of 10. By combining the KamLAND-Zen pre- and post-purification data, we obtain a preliminary lower limit on the 0谓尾尾decay half-life of T_{1/2}^{0谓} > 2.6 x 10^{25} yr at 90% C.L. The search sensitivity will be enhanced with additional low background data after the purification. Prospects for further improvements with future KamLAND-Zen upgrades are also presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.0077v1-abstract-full').style.display = 'none'; document.getElementById('1409.0077v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 August, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 8 figures, submitted to proceedings of the XXVI Conference on Neutrino Physics and Astrophysics (Neutrino 2014)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1407.2028">arXiv:1407.2028</a> <span> [<a href="https://arxiv.org/pdf/1407.2028">pdf</a>, <a href="https://arxiv.org/ps/1407.2028">ps</a>, <a href="https://arxiv.org/format/1407.2028">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Measurement of the absolute branching ratio of the $K^+ \rightarrow 蟺^+蟺^-蟺^+(纬)$ decay with the KLOE detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+T+K">The KLOE-2 Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1407.2028v3-abstract-short" style="display: inline;"> The absolute branching ratio of the $K^+ \rightarrow 蟺^+蟺^-蟺^+(纬)$ decay, inclusive of final-state radiation, has been measured using $\sim$17 million tagged $K^+$ mesons collected with the KLOE detector at DA$桅$NE, the Frascati $蠁$-factory. The result is: \[ BR(K^+ \rightarrow 蟺^+蟺^-蟺^+(纬)) = 0.05565 \pm 0.00031_{stat} \pm 0.00025_{syst} \] a factor $\simeq$ 5 more precise with respect to the p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.2028v3-abstract-full').style.display = 'inline'; document.getElementById('1407.2028v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1407.2028v3-abstract-full" style="display: none;"> The absolute branching ratio of the $K^+ \rightarrow 蟺^+蟺^-蟺^+(纬)$ decay, inclusive of final-state radiation, has been measured using $\sim$17 million tagged $K^+$ mesons collected with the KLOE detector at DA$桅$NE, the Frascati $蠁$-factory. The result is: \[ BR(K^+ \rightarrow 蟺^+蟺^-蟺^+(纬)) = 0.05565 \pm 0.00031_{stat} \pm 0.00025_{syst} \] a factor $\simeq$ 5 more precise with respect to the previous result. This work completes the program of precision measurements of the dominant kaon branching ratios at KLOE. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.2028v3-abstract-full').style.display = 'none'; document.getElementById('1407.2028v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 September, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 July, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 2 figures, to be submitted to Physics Letters B</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1312.6818">arXiv:1312.6818</a> <span> [<a href="https://arxiv.org/pdf/1312.6818">pdf</a>, <a href="https://arxiv.org/ps/1312.6818">ps</a>, <a href="https://arxiv.org/format/1312.6818">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2014.01.026">10.1016/j.physletb.2014.01.026 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Test of CPT and Lorentz symmetry in entangled neutral kaons with the KLOE experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KLOE-2 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Balwierz-Pytko%2C+I">I. Balwierz-Pytko</a>, <a href="/search/hep-ex?searchtype=author&query=Bencivenni%2C+G">G. Bencivenni</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Balkestahl%2C+L+C">L. Caldeira Balkestahl</a>, <a href="/search/hep-ex?searchtype=author&query=Capon%2C+G">G. Capon</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Curciarello%2C+F">F. Curciarello</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/hep-ex?searchtype=author&query=Dan%C3%A8%2C+E">E. Dan猫</a>, <a href="/search/hep-ex?searchtype=author&query=De+Leo%2C+V">V. De Leo</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Robertis%2C+G">G. De Robertis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Simone%2C+P">P. De Simone</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Cicco%2C+A">A. Di Cicco</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Donato%2C+C">C. Di Donato</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Salvo%2C+R">R. Di Salvo</a> , et al. (49 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1312.6818v2-abstract-short" style="display: inline;"> Neutral kaon pairs produced in phi decays in anti-symmetric entangled state can be exploited to search for violation of CPT symmetry and Lorentz invariance. We present an analysis of the CP-violating process phi->K_S K_L->pi+pi-pi+pi- based on 1.7 fb-1 of data collected by the KLOE experiment at the Frascati phi-factory DAFNE. The data are used to perform a measurement of the CPT-violating paramet… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.6818v2-abstract-full').style.display = 'inline'; document.getElementById('1312.6818v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1312.6818v2-abstract-full" style="display: none;"> Neutral kaon pairs produced in phi decays in anti-symmetric entangled state can be exploited to search for violation of CPT symmetry and Lorentz invariance. We present an analysis of the CP-violating process phi->K_S K_L->pi+pi-pi+pi- based on 1.7 fb-1 of data collected by the KLOE experiment at the Frascati phi-factory DAFNE. The data are used to perform a measurement of the CPT-violating parameters Delta_amu for neutral kaons in the contest of the Standard Model Extension framework. The parameters measured in the reference frame of the fixed stars are: Delta_ao = (-6.0 +- 7.7_{stat} +- 3.1_{syst}) x 10^{-18} GeV Delta_ax = ( 0.9 +- 1.5_{stat} +- 0.6_{syst}) x 10^{-18} GeV Delta_ay = (-2.0 +- 1.5_{stat} +- 0.5_{syst}) x 10^{-18} GeV Delta_az = ( 3.1 +- 1.7_{stat} +- 0.5_{syst}) x 10^{-18} GeV These are presently the most precise measurements in the quark sector of the Standard Model Extension. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.6818v2-abstract-full').style.display = 'none'; document.getElementById('1312.6818v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 March, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 December, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 6 figures, added few typo corrections</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. B 730 (2014) 89-94 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1211.3863">arXiv:1211.3863</a> <span> [<a href="https://arxiv.org/pdf/1211.3863">pdf</a>, <a href="https://arxiv.org/ps/1211.3863">ps</a>, <a href="https://arxiv.org/format/1211.3863">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.110.062502">10.1103/PhysRevLett.110.062502 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Limit on Neutrinoless 尾尾 Decay of Xe-136 from the First Phase of KamLAND-Zen and Comparison with the Positive Claim in Ge-76 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KamLAND-Zen Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1211.3863v2-abstract-short" style="display: inline;"> We present results from the first phase of the KamLAND-Zen double-beta decay experiment, corresponding to an exposure of 89.5 kg yr of Xe-136. We obtain a lower limit for the neutrinoless double-beta decay half-life of T_{1/2}^{0谓} > 1.9 x 10^{25} yr at 90% C.L. The combined results from KamLAND-Zen and EXO-200 give T_{1/2}^{0谓} > 3.4 x 10^{25} yr at 90% C.L., which corresponds to a Majorana neutr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1211.3863v2-abstract-full').style.display = 'inline'; document.getElementById('1211.3863v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1211.3863v2-abstract-full" style="display: none;"> We present results from the first phase of the KamLAND-Zen double-beta decay experiment, corresponding to an exposure of 89.5 kg yr of Xe-136. We obtain a lower limit for the neutrinoless double-beta decay half-life of T_{1/2}^{0谓} > 1.9 x 10^{25} yr at 90% C.L. The combined results from KamLAND-Zen and EXO-200 give T_{1/2}^{0谓} > 3.4 x 10^{25} yr at 90% C.L., which corresponds to a Majorana neutrino mass limit of <m_{尾尾}> < (120-250) meV based on a representative range of available matrix element calculations. Using those calculations, this result excludes the Majorana neutrino mass range expected from the neutrinoless double-beta decay detection claim in Ge-76, reported by a part of the Heidelberg-Moscow Collaboration, at more than 97.5% C.L. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1211.3863v2-abstract-full').style.display = 'none'; document.getElementById('1211.3863v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 February, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 November, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.110:062502,2013 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1211.1845">arXiv:1211.1845</a> <span> [<a href="https://arxiv.org/pdf/1211.1845">pdf</a>, <a href="https://arxiv.org/ps/1211.1845">ps</a>, <a href="https://arxiv.org/format/1211.1845">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1007/JHEP01(2013)119">10.1007/JHEP01(2013)119 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of 畏 meson production in 纬纬 interactions and 螕(畏-->纬纬) with the KLOE detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KLOE-2 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Badoni%2C+D">D. Badoni</a>, <a href="/search/hep-ex?searchtype=author&query=Balwierz-Pytko%2C+I">I. Balwierz-Pytko</a>, <a href="/search/hep-ex?searchtype=author&query=Bencivenni%2C+G">G. Bencivenni</a>, <a href="/search/hep-ex?searchtype=author&query=Bini%2C+C">C. Bini</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Balkestaahl%2C+L+C">L. Caldeira Balkestaahl</a>, <a href="/search/hep-ex?searchtype=author&query=Capon%2C+G">G. Capon</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/hep-ex?searchtype=author&query=Dane%2C+E">E. Dane</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Robertis%2C+G">G. De Robertis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Donato%2C+C">C. Di Donato</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Salvo%2C+R">R. Di Salvo</a>, <a href="/search/hep-ex?searchtype=author&query=Domenici%2C+D">D. Domenici</a>, <a href="/search/hep-ex?searchtype=author&query=Erriquez%2C+O">O. Erriquez</a> , et al. (47 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1211.1845v2-abstract-short" style="display: inline;"> We present a measurement of 畏 meson production in photon-photon interactions produced by electron-positron beams colliding with \sqrt{s}=1 GeV. The measurement is done with the KLOE detector at the 蠁-factory DA桅NE with an integrated luminosity of 0.24 fb^{-1}. The e^+e^- --> e^+e^-畏 cross section is measured without detecting the outgoing electron and positron, selecting the decays 畏-->蟺^+蟺^-蟺^0 a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1211.1845v2-abstract-full').style.display = 'inline'; document.getElementById('1211.1845v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1211.1845v2-abstract-full" style="display: none;"> We present a measurement of 畏 meson production in photon-photon interactions produced by electron-positron beams colliding with \sqrt{s}=1 GeV. The measurement is done with the KLOE detector at the 蠁-factory DA桅NE with an integrated luminosity of 0.24 fb^{-1}. The e^+e^- --> e^+e^-畏 cross section is measured without detecting the outgoing electron and positron, selecting the decays 畏-->蟺^+蟺^-蟺^0 and 畏-->蟺^0蟺^0蟺^0. The most relevant background is due to e^+e^- --> 畏纬 when the monochromatic photon escapes detection. The cross section for this process is measured as 蟽(e^+e^- -->畏纬) = (856 \pm 8_{stat} \pm 16_{syst}) pb. The combined result for the e^+e^- -->e^+e^-畏 cross section is 蟽(e^+e^- -->e^+e^-畏) = (32.72 \pm 1.27_{stat} \pm 0.70_{syst}) pb. From this we derive the partial width 螕(畏-->纬纬) = (520 \pm 20_{stat} \pm 13_{syst}) eV. This is in agreement with the world average and is the most precise measurement to date. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1211.1845v2-abstract-full').style.display = 'none'; document.getElementById('1211.1845v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 December, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 November, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Version accepted by JHEP</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1210.3927">arXiv:1210.3927</a> <span> [<a href="https://arxiv.org/pdf/1210.3927">pdf</a>, <a href="https://arxiv.org/ps/1210.3927">ps</a>, <a href="https://arxiv.org/format/1210.3927">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2013.01.067">10.1016/j.physletb.2013.01.067 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Limit on the production of a light vector gauge boson in phi meson decays with the KLOE detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KLOE-2 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Badoni%2C+D">D. Badoni</a>, <a href="/search/hep-ex?searchtype=author&query=Balwierz-Pytko%2C+I">I. Balwierz-Pytko</a>, <a href="/search/hep-ex?searchtype=author&query=Bencivenni%2C+G">G. Bencivenni</a>, <a href="/search/hep-ex?searchtype=author&query=Bini%2C+C">C. Bini</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Balkestaahl%2C+L+C">L. Caldeira Balkestaahl</a>, <a href="/search/hep-ex?searchtype=author&query=Capon%2C+G">G. Capon</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/hep-ex?searchtype=author&query=Dane%2C+E">E. Dane</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Robertis%2C+G">G. De Robertis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Donato%2C+C">C. Di Donato</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Salvo%2C+R">R. Di Salvo</a>, <a href="/search/hep-ex?searchtype=author&query=Domenici%2C+D">D. Domenici</a>, <a href="/search/hep-ex?searchtype=author&query=Erriquez%2C+O">O. Erriquez</a> , et al. (47 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1210.3927v2-abstract-short" style="display: inline;"> We present a new limit on the production of a light dark-force mediator with the KLOE detector at DAPHNE. This boson, called U, has been searched for in the decay phi --> eta U, U --> e+ e-, analyzing the decay eta --> pi0 pi0 pi0 in a data sample of 1.7 fb-1. No structures are observed in the e+e- invariant mass distribution over the background. This search is combined with a previous result obta… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.3927v2-abstract-full').style.display = 'inline'; document.getElementById('1210.3927v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1210.3927v2-abstract-full" style="display: none;"> We present a new limit on the production of a light dark-force mediator with the KLOE detector at DAPHNE. This boson, called U, has been searched for in the decay phi --> eta U, U --> e+ e-, analyzing the decay eta --> pi0 pi0 pi0 in a data sample of 1.7 fb-1. No structures are observed in the e+e- invariant mass distribution over the background. This search is combined with a previous result obtained from the decay eta --> pi+ pi- pi0, increasing the sensitivity. We set an upper limit at 90% C.L. on the ratio between the U boson coupling constant and the fine structure constant of alpha'/alpha < 1.7x10^-5 for 30<M_U<400 MeV and alpha'/alpha < 8x10^-6 for the sub-region 50<M_U<210 MeV. This result assumes the Vector Meson Dominance expectations for the phietagamma^* transition form factor. The dependence of this limit on the transition form factor has also been studied. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1210.3927v2-abstract-full').style.display = 'none'; document.getElementById('1210.3927v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 31 January, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 October, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 7 figures, updated PLB version</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1205.6372">arXiv:1205.6372</a> <span> [<a href="https://arxiv.org/pdf/1205.6372">pdf</a>, <a href="https://arxiv.org/ps/1205.6372">ps</a>, <a href="https://arxiv.org/format/1205.6372">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.86.021601">10.1103/PhysRevC.86.021601 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Limits on Majoron-emitting double-beta decays of Xe-136 in the KamLAND-Zen experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KamLAND-Zen Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+A">A. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Gando%2C+Y">Y. Gando</a>, <a href="/search/hep-ex?searchtype=author&query=Hanakago%2C+H">H. Hanakago</a>, <a href="/search/hep-ex?searchtype=author&query=Ikeda%2C+H">H. Ikeda</a>, <a href="/search/hep-ex?searchtype=author&query=Inoue%2C+K">K. Inoue</a>, <a href="/search/hep-ex?searchtype=author&query=Kato%2C+R">R. Kato</a>, <a href="/search/hep-ex?searchtype=author&query=Koga%2C+M">M. Koga</a>, <a href="/search/hep-ex?searchtype=author&query=Matsuda%2C+S">S. Matsuda</a>, <a href="/search/hep-ex?searchtype=author&query=Mitsui%2C+T">T. Mitsui</a>, <a href="/search/hep-ex?searchtype=author&query=Nakada%2C+T">T. Nakada</a>, <a href="/search/hep-ex?searchtype=author&query=Nakamura%2C+K">K. Nakamura</a>, <a href="/search/hep-ex?searchtype=author&query=Obata%2C+A">A. Obata</a>, <a href="/search/hep-ex?searchtype=author&query=Oki%2C+A">A. Oki</a>, <a href="/search/hep-ex?searchtype=author&query=Ono%2C+Y">Y. Ono</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+I">I. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Shirai%2C+J">J. Shirai</a>, <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a>, <a href="/search/hep-ex?searchtype=author&query=Takemoto%2C+Y">Y. Takemoto</a>, <a href="/search/hep-ex?searchtype=author&query=Tamae%2C+K">K. Tamae</a>, <a href="/search/hep-ex?searchtype=author&query=Ueshima%2C+K">K. Ueshima</a>, <a href="/search/hep-ex?searchtype=author&query=Watanabe%2C+H">H. Watanabe</a>, <a href="/search/hep-ex?searchtype=author&query=Xu%2C+B+D">B. D. Xu</a>, <a href="/search/hep-ex?searchtype=author&query=Yamada%2C+S">S. Yamada</a> , et al. (16 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1205.6372v2-abstract-short" style="display: inline;"> We present limits on Majoron-emitting neutrinoless double-beta decay modes based on an exposure of 112.3 days with 125 kg of Xe-136. In particular, a lower limit on the ordinary (spectral index n = 1) Majoron-emitting decay half-life of Xe-136 is obtained as T_{1/2}^{0谓蠂^{0}} > 2.6 x 10^{24} yr at 90% C.L., a factor of five more stringent than previous limits. The corresponding upper limit on the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.6372v2-abstract-full').style.display = 'inline'; document.getElementById('1205.6372v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1205.6372v2-abstract-full" style="display: none;"> We present limits on Majoron-emitting neutrinoless double-beta decay modes based on an exposure of 112.3 days with 125 kg of Xe-136. In particular, a lower limit on the ordinary (spectral index n = 1) Majoron-emitting decay half-life of Xe-136 is obtained as T_{1/2}^{0谓蠂^{0}} > 2.6 x 10^{24} yr at 90% C.L., a factor of five more stringent than previous limits. The corresponding upper limit on the effective Majoron-neutrino coupling, using a range of available nuclear matrix calculations, is <g_{ee}> < (0.8 - 1.6) x 10^{-5}. This excludes a previously unconstrained region of parameter space and strongly limits the possible contribution of ordinary Majoron emission modes to 0谓尾尾decay for neutrino masses in the inverted hierarchy scheme. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.6372v2-abstract-full').style.display = 'none'; document.getElementById('1205.6372v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 August, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 May, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 3 figures (1 figure added). Published version in PRC rapid communication</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.C86:021601,2012 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1201.4664">arXiv:1201.4664</a> <span> [<a href="https://arxiv.org/pdf/1201.4664">pdf</a>, <a href="https://arxiv.org/ps/1201.4664">ps</a>, <a href="https://arxiv.org/format/1201.4664">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.85.045504">10.1103/PhysRevC.85.045504 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the double-尾decay half-life of ^{136}Xe with the KamLAND-Zen experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KamLAND-Zen Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1201.4664v2-abstract-short" style="display: inline;"> We present results from the KamLAND-Zen double-beta decay experiment based on an exposure of 77.6 days with 129 kg of $^{136}$Xe. The measured two-neutrino double-beta decay half-life of $^{136}$Xe is $T_{1/2}^{2谓} = 2.38 \pm 0.02(stat) \pm 0.14(syst) \times 10^{21}$ yr, consistent with a recent measurement by EXO-200. We also obtain a lower limit for the neutrinoless double-beta decay half-life,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.4664v2-abstract-full').style.display = 'inline'; document.getElementById('1201.4664v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1201.4664v2-abstract-full" style="display: none;"> We present results from the KamLAND-Zen double-beta decay experiment based on an exposure of 77.6 days with 129 kg of $^{136}$Xe. The measured two-neutrino double-beta decay half-life of $^{136}$Xe is $T_{1/2}^{2谓} = 2.38 \pm 0.02(stat) \pm 0.14(syst) \times 10^{21}$ yr, consistent with a recent measurement by EXO-200. We also obtain a lower limit for the neutrinoless double-beta decay half-life, $T_{1/2}^{0谓} > 5.7 \times 10^{24}$ yr at 90% confidence level (C.L.), which corresponds to almost a five-fold improvement over previous limits. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1201.4664v2-abstract-full').style.display = 'none'; document.getElementById('1201.4664v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 April, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 January, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 4 figures. Version as published in PRC</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.C85:045504,2012 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1110.0411">arXiv:1110.0411</a> <span> [<a href="https://arxiv.org/pdf/1110.0411">pdf</a>, <a href="https://arxiv.org/ps/1110.0411">ps</a>, <a href="https://arxiv.org/format/1110.0411">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2011.11.033">10.1016/j.physletb.2011.11.033 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Search for a vector gauge boson in phi meson decays with the KLOE detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KLOE-2 Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1110.0411v2-abstract-short" style="display: inline;"> The existence of a light dark force mediator has been tested with the KLOE detector at DAPHNE. This particle, called U, is searched for using the decay chain phi-->etaU, eta-->pi+pi-pi0, U-->e+e-. No evidence is found in 1.5 fb-1 of data. The resulting exclusion plot covers the mass range 5<M_U<470 MeV, setting an upper limit on the ratio between the U boson coupling constant and the fine structur… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1110.0411v2-abstract-full').style.display = 'inline'; document.getElementById('1110.0411v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1110.0411v2-abstract-full" style="display: none;"> The existence of a light dark force mediator has been tested with the KLOE detector at DAPHNE. This particle, called U, is searched for using the decay chain phi-->etaU, eta-->pi+pi-pi0, U-->e+e-. No evidence is found in 1.5 fb-1 of data. The resulting exclusion plot covers the mass range 5<M_U<470 MeV, setting an upper limit on the ratio between the U boson coupling constant and the fine structure constant, alpha'/alpha, of <= 2x10^-5 at 90% C.L. for 50<M_U<420 MeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1110.0411v2-abstract-full').style.display = 'none'; document.getElementById('1110.0411v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 November, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 October, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 8 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1109.2461">arXiv:1109.2461</a> <span> [<a href="https://arxiv.org/pdf/1109.2461">pdf</a>, <a href="https://arxiv.org/ps/1109.2461">ps</a>, <a href="https://arxiv.org/format/1109.2461">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjc/s10052-012-1917-1">10.1140/epjc/s10052-012-1917-1 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> On the possibility to measure the (pi0 to gamma gamma) decay width and the (gamma* gamma to pi0) transition form factor with the KLOE-2 experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Czyz%2C+H">H. Czyz</a>, <a href="/search/hep-ex?searchtype=author&query=Gonnella%2C+F">F. Gonnella</a>, <a href="/search/hep-ex?searchtype=author&query=Ivashyn%2C+S">S. Ivashyn</a>, <a href="/search/hep-ex?searchtype=author&query=Mascolo%2C+M">M. Mascolo</a>, <a href="/search/hep-ex?searchtype=author&query=Messi%2C+R">R. Messi</a>, <a href="/search/hep-ex?searchtype=author&query=Moricciani%2C+D">D. Moricciani</a>, <a href="/search/hep-ex?searchtype=author&query=Nyffeler%2C+A">A. Nyffeler</a>, <a href="/search/hep-ex?searchtype=author&query=Venanzoni%2C+G">G. Venanzoni</a>, <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KLOE-2 Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1109.2461v2-abstract-short" style="display: inline;"> A possibility of KLOE-2 experiment to measure the width Gamma(pi0 to gamma gamma) and the (pi0 gamma gamma*) form factor F(Q^2) at low invariant masses of the virtual photon in the space-like region is considered. This measurement is an important test of the strong interaction dynamics at low energies. The feasibility is estimated on the basis of a Monte-Carlo simulation. The expected accuracy for… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1109.2461v2-abstract-full').style.display = 'inline'; document.getElementById('1109.2461v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1109.2461v2-abstract-full" style="display: none;"> A possibility of KLOE-2 experiment to measure the width Gamma(pi0 to gamma gamma) and the (pi0 gamma gamma*) form factor F(Q^2) at low invariant masses of the virtual photon in the space-like region is considered. This measurement is an important test of the strong interaction dynamics at low energies. The feasibility is estimated on the basis of a Monte-Carlo simulation. The expected accuracy for Gamma(pi0 to gamma gamma) is at a per cent level, which is better than the current experimental world average and theory. The form factor will be measured for the first time at Q^2 less or equal 0.1 GeV^2 in the space-like region. The impact of these measurements on the accuracy of the pion-exchange contribution to the hadronic light-by-light scattering part of the anomalous magnetic moment of the muon is also discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1109.2461v2-abstract-full').style.display = 'none'; document.getElementById('1109.2461v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 February, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 September, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">2-column style; matches the revision accepted by EPJC</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> EPJ C72, 1917 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.5733">arXiv:1107.5733</a> <span> [<a href="https://arxiv.org/pdf/1107.5733">pdf</a>, <a href="https://arxiv.org/ps/1107.5733">ps</a>, <a href="https://arxiv.org/format/1107.5733">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Measurement of $螕(畏\to 蟺^+蟺^-纬)/螕(畏\to 蟺^+蟺^-蟺^0)$ with KLOE experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+KLOE+Collaboration"> The KLOE Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosino%2C+F">F. Ambrosino</a>, <a href="/search/hep-ex?searchtype=author&query=Antonelli%2C+A">A. Antonelli</a>, <a href="/search/hep-ex?searchtype=author&query=Antonelli%2C+M">M. Antonelli</a>, <a href="/search/hep-ex?searchtype=author&query=Archilli%2C+F">F. Archilli</a>, <a href="/search/hep-ex?searchtype=author&query=Balwierz%2C+I">I. Balwierz</a>, <a href="/search/hep-ex?searchtype=author&query=Bencivenni%2C+G">G. Bencivenni</a>, <a href="/search/hep-ex?searchtype=author&query=Bini%2C+C">C. Bini</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bocchetta%2C+S">S. Bocchetta</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Capon%2C+G">G. Capon</a>, <a href="/search/hep-ex?searchtype=author&query=Capussela%2C+T">T. Capussela</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwiski%2C+E">E. Czerwiski</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Simone%2C+P">P. De Simone</a>, <a href="/search/hep-ex?searchtype=author&query=De+Zorzi%2C+G">G. De Zorzi</a>, <a href="/search/hep-ex?searchtype=author&query=Denig%2C+A">A. Denig</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Donato%2C+C">C. Di Donato</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Micco%2C+B">B. Di Micco</a> , et al. (65 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1107.5733v1-abstract-short" style="display: inline;"> We report the measurement of the ratio $螕(畏\to 蟺^+蟺^-纬)/螕(畏\to 蟺^+蟺^-蟺^0)$ analyzing a large sample of $蠁\to 畏纬$ decays recorded with the KLOE experiment at the DA$桅$NE $e^+ e^-$ collider, corresponding to an integrated luminosity of 558 pb$^{-1}$. The $畏\to 蟺^+蟺^-纬$ process is supposed to proceed both via a resonant contribution, mediated by the $蟻$ meson, and a non resonant direct term, connecte… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.5733v1-abstract-full').style.display = 'inline'; document.getElementById('1107.5733v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.5733v1-abstract-full" style="display: none;"> We report the measurement of the ratio $螕(畏\to 蟺^+蟺^-纬)/螕(畏\to 蟺^+蟺^-蟺^0)$ analyzing a large sample of $蠁\to 畏纬$ decays recorded with the KLOE experiment at the DA$桅$NE $e^+ e^-$ collider, corresponding to an integrated luminosity of 558 pb$^{-1}$. The $畏\to 蟺^+蟺^-纬$ process is supposed to proceed both via a resonant contribution, mediated by the $蟻$ meson, and a non resonant direct term, connected to the box anomaly. The presence of the direct term affects the partial width value. Our result $R_畏=螕(畏\to 蟺^+ 蟺^- 纬)/螕(畏\to 蟺^+ 蟺^- 蟺^0)= 0.1838\pm 0.0005_{stat} \pm 0.0030_{syst}$ is in agreement with a recent CLEO measurement, which differs by more 3 $蟽$ from the average of previous results. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.5733v1-abstract-full').style.display = 'none'; document.getElementById('1107.5733v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 July, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2011. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.3782">arXiv:1107.3782</a> <span> [<a href="https://arxiv.org/pdf/1107.3782">pdf</a>, <a href="https://arxiv.org/ps/1107.3782">ps</a>, <a href="https://arxiv.org/format/1107.3782">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> $纬纬$ physics with the KLOE experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+T+K">The KLOE-2 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Archilli%2C+F">F. Archilli</a>, <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Badoni%2C+D">D. Badoni</a>, <a href="/search/hep-ex?searchtype=author&query=Balwierz%2C+I">I. Balwierz</a>, <a href="/search/hep-ex?searchtype=author&query=Bencivenni%2C+G">G. Bencivenni</a>, <a href="/search/hep-ex?searchtype=author&query=Bini%2C+C">C. Bini</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bocci%2C+V">V. Bocci</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Bulychjev%2C+S+A">S. A. Bulychjev</a>, <a href="/search/hep-ex?searchtype=author&query=Campana%2C+P">P. Campana</a>, <a href="/search/hep-ex?searchtype=author&query=Capon%2C+G">G. Capon</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/hep-ex?searchtype=author&query=Dane%2C+E">E. Dane</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Robertis%2C+G">G. De Robertis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Zorzi%2C+G">G. De Zorzi</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Donato%2C+C">C. Di Donato</a> , et al. (45 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1107.3782v1-abstract-short" style="display: inline;"> The processes $e^+e^-\to e^+e^-X$, with $X$ being either the $畏$ meson or $蟺^0蟺^0$, are studied at DA$桅$NE, with $e^+e^-$ beams colliding at $\sqrt{s}\simeq1$ GeV, below the $蠁$ resonance peak. The data sample is from an integrated luminosity of 240 pb$^{-1}$, collected by the KLOE experiment without tagging of the outgoing $e^+e^-$. Preliminary results are presented on the observation of the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.3782v1-abstract-full').style.display = 'inline'; document.getElementById('1107.3782v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.3782v1-abstract-full" style="display: none;"> The processes $e^+e^-\to e^+e^-X$, with $X$ being either the $畏$ meson or $蟺^0蟺^0$, are studied at DA$桅$NE, with $e^+e^-$ beams colliding at $\sqrt{s}\simeq1$ GeV, below the $蠁$ resonance peak. The data sample is from an integrated luminosity of 240 pb$^{-1}$, collected by the KLOE experiment without tagging of the outgoing $e^+e^-$. Preliminary results are presented on the observation of the $纬纬\to畏$ process, with both $畏\to蟺^+蟺^-蟺^0$ and $畏\to蟺^0蟺^0蟺^0$ channels, and the evidence for $纬纬\to蟺^0蟺^0$ production at low $蟺^0蟺^0$ invariant mass. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.3782v1-abstract-full').style.display = 'none'; document.getElementById('1107.3782v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 July, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Contributed paper to the Lepton-Photon 2011 Conference</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1105.6067">arXiv:1105.6067</a> <span> [<a href="https://arxiv.org/pdf/1105.6067">pdf</a>, <a href="https://arxiv.org/ps/1105.6067">ps</a>, <a href="https://arxiv.org/format/1105.6067">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2011.07.033">10.1016/j.physletb.2011.07.033 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Observation of the rare eta->e+e-e+e- decay with the KLOE experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=The+KLOE+Collaboration"> The KLOE Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=Ambrosino%2C+F">F. Ambrosino</a>, <a href="/search/hep-ex?searchtype=author&query=Antonelli%2C+A">A. Antonelli</a>, <a href="/search/hep-ex?searchtype=author&query=Antonelli%2C+M">M. Antonelli</a>, <a href="/search/hep-ex?searchtype=author&query=Archilli%2C+F">F. Archilli</a>, <a href="/search/hep-ex?searchtype=author&query=Balwierz%2C+I">I. Balwierz</a>, <a href="/search/hep-ex?searchtype=author&query=Bencivenni%2C+G">G. Bencivenni</a>, <a href="/search/hep-ex?searchtype=author&query=Bini%2C+C">C. Bini</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bocchetta%2C+S">S. Bocchetta</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Capon%2C+G">G. Capon</a>, <a href="/search/hep-ex?searchtype=author&query=Capussela%2C+T">T. Capussela</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/hep-ex?searchtype=author&query=DeLucia%2C+E">E. DeLucia</a>, <a href="/search/hep-ex?searchtype=author&query=DeSantis%2C+A">A. DeSantis</a>, <a href="/search/hep-ex?searchtype=author&query=DeSimone%2C+P">P. DeSimone</a>, <a href="/search/hep-ex?searchtype=author&query=DeZorzi%2C+G">G. DeZorzi</a>, <a href="/search/hep-ex?searchtype=author&query=Denig%2C+A">A. Denig</a>, <a href="/search/hep-ex?searchtype=author&query=DiDomenico%2C+A">A. DiDomenico</a>, <a href="/search/hep-ex?searchtype=author&query=DiDonato%2C+C">C. DiDonato</a>, <a href="/search/hep-ex?searchtype=author&query=DiMicco%2C+B">B. DiMicco</a> , et al. (65 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1105.6067v3-abstract-short" style="display: inline;"> We report the first observation of the rare eta->e+e-e+e- decay based on 1.7 fb^{-1} collected by the KLOE experiment at the DAFNE phi-factory. The selection of the e+e-e+e- final state is fully inclusive of radiation. We have identified 362 +- 29 events resulting in a branching ratio of (2.4 +- 0.2_stat+bckg +- 0.1_syst) x 10^{-5}. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1105.6067v3-abstract-full" style="display: none;"> We report the first observation of the rare eta->e+e-e+e- decay based on 1.7 fb^{-1} collected by the KLOE experiment at the DAFNE phi-factory. The selection of the e+e-e+e- final state is fully inclusive of radiation. We have identified 362 +- 29 events resulting in a branching ratio of (2.4 +- 0.2_stat+bckg +- 0.1_syst) x 10^{-5}. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1105.6067v3-abstract-full').style.display = 'none'; document.getElementById('1105.6067v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 October, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 May, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 3 figures, to be published on PLB</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Lett. B702 (2011) 324-328 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1103.0094">arXiv:1103.0094</a> <span> [<a href="https://arxiv.org/pdf/1103.0094">pdf</a>, <a href="https://arxiv.org/ps/1103.0094">ps</a>, <a href="https://arxiv.org/format/1103.0094">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> Tau lepton physics at Belle </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=collaboration%2C+K+H+f+B">K. Hayasaka for Belle collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1103.0094v1-abstract-short" style="display: inline;"> We report the recent results of a search for lepton-flavor-violating tau decays and a search for CP violation in tau to nu Ks pi using a large data sample accumulated with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. The sensitivity to these modes is significantly improved compared to previous experiments. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1103.0094v1-abstract-full" style="display: none;"> We report the recent results of a search for lepton-flavor-violating tau decays and a search for CP violation in tau to nu Ks pi using a large data sample accumulated with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. The sensitivity to these modes is significantly improved compared to previous experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1103.0094v1-abstract-full').style.display = 'none'; document.getElementById('1103.0094v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 March, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, proceedings for DISCRETE10</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1002.2572">arXiv:1002.2572</a> <span> [<a href="https://arxiv.org/pdf/1002.2572">pdf</a>, <a href="https://arxiv.org/ps/1002.2572">ps</a>, <a href="https://arxiv.org/format/1002.2572">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Technical Design Report of the Inner Tracker for the KLOE-2 experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KLOE-2 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Archilli%2C+F">F. Archilli</a>, <a href="/search/hep-ex?searchtype=author&query=Badoni%2C+D">D. Badoni</a>, <a href="/search/hep-ex?searchtype=author&query=Babusci%2C+D">D. Babusci</a>, <a href="/search/hep-ex?searchtype=author&query=Bencivenni%2C+G">G. Bencivenni</a>, <a href="/search/hep-ex?searchtype=author&query=Bini%2C+C">C. Bini</a>, <a href="/search/hep-ex?searchtype=author&query=Bloise%2C+C">C. Bloise</a>, <a href="/search/hep-ex?searchtype=author&query=Bocci%2C+V">V. Bocci</a>, <a href="/search/hep-ex?searchtype=author&query=Bossi%2C+F">F. Bossi</a>, <a href="/search/hep-ex?searchtype=author&query=Branchini%2C+P">P. Branchini</a>, <a href="/search/hep-ex?searchtype=author&query=Budano%2C+A">A. Budano</a>, <a href="/search/hep-ex?searchtype=author&query=Bulychjev%2C+S+A">S. A. Bulychjev</a>, <a href="/search/hep-ex?searchtype=author&query=Campana%2C+P">P. Campana</a>, <a href="/search/hep-ex?searchtype=author&query=Capon%2C+G">G. Capon</a>, <a href="/search/hep-ex?searchtype=author&query=Ceradini%2C+F">F. Ceradini</a>, <a href="/search/hep-ex?searchtype=author&query=Ciambrone%2C+P">P. Ciambrone</a>, <a href="/search/hep-ex?searchtype=author&query=Czerwinski%2C+E">E. Czerwinski</a>, <a href="/search/hep-ex?searchtype=author&query=Dan%C3%A8%2C+E">E. Dan猫</a>, <a href="/search/hep-ex?searchtype=author&query=De+Lucia%2C+E">E. De Lucia</a>, <a href="/search/hep-ex?searchtype=author&query=De+Robertis%2C+G">G. De Robertis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Santis%2C+A">A. De Santis</a>, <a href="/search/hep-ex?searchtype=author&query=De+Zorzi%2C+G">G. De Zorzi</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Domenico%2C+A">A. Di Domenico</a>, <a href="/search/hep-ex?searchtype=author&query=Di+Donato%2C+C">C. Di Donato</a> , et al. (59 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1002.2572v1-abstract-short" style="display: inline;"> The technical design report of the Inner Tracker for the KLOE-2 experiment is presented </span> <span class="abstract-full has-text-grey-dark mathjax" id="1002.2572v1-abstract-full" style="display: none;"> The technical design report of the Inner Tracker for the KLOE-2 experiment is presented <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1002.2572v1-abstract-full').style.display = 'none'; document.getElementById('1002.2572v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 February, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">77 pages</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> LNF-10/3(P) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0805.2262">arXiv:0805.2262</a> <span> [<a href="https://arxiv.org/pdf/0805.2262">pdf</a>, <a href="https://arxiv.org/ps/0805.2262">ps</a>, <a href="https://arxiv.org/format/0805.2262">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Search for the decay K_S->e+e- </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Archilli%2C+F">Flavio Archilli</a>, <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+f+K">for KLOE Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0805.2262v3-abstract-short" style="display: inline;"> We present results of a direct search for the decay K_S->e+e- with the KLOE detector, obtained with a sample of e+e- -> phi -> K_S K_L events produced at DAFNE, the Frascati phi-factory, for an integrated luminosity of 1.9 fb-1. The Standard Model prediction for this decay is BR(K_S->e+e-) = 2 x 10^-14. The search has been performed by tagging the K_S decays with simultaneous detection of a K_L… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0805.2262v3-abstract-full').style.display = 'inline'; document.getElementById('0805.2262v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0805.2262v3-abstract-full" style="display: none;"> We present results of a direct search for the decay K_S->e+e- with the KLOE detector, obtained with a sample of e+e- -> phi -> K_S K_L events produced at DAFNE, the Frascati phi-factory, for an integrated luminosity of 1.9 fb-1. The Standard Model prediction for this decay is BR(K_S->e+e-) = 2 x 10^-14. The search has been performed by tagging the K_S decays with simultaneous detection of a K_L interaction in the calorimeter. Background rejection has been optimized by using both kinematic cuts and particle identification. At the end of the analysis chain we find BR(K_S->e+e-) < 9.3 x 10^-9 at 90% CL, which improves by a factor of ~15 on the previous best result, obtained by CPLEAR experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0805.2262v3-abstract-full').style.display = 'none'; document.getElementById('0805.2262v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 August, 2008; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 May, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 4 figures, to appear in the proceedings of 43rd Rencontres de Moriond EW, La Thuile, Italy, 1-8 March 2008</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0606008">arXiv:hep-ex/0606008</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0606008">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0606008">ps</a>, <a href="https://arxiv.org/format/hep-ex/0606008">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Measurement of the Pion Formfactor with KLOE and Study of the Reaction f0(980) to pi+pi- </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Denig%2C+A">Achim Denig</a>, <a href="/search/hep-ex?searchtype=author&query=collaboration%2C+K">KLOE collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/0606008v2-abstract-short" style="display: inline;"> At the Frascati phi-factory DAPHNE the pion formfactor is measured by means of the 'radiative return', i.e. by using events in which one of the collider electrons (positrons) has radiated an initial state radiation photon, lowering in such a way the invariant mass M_pipi of the two-pion-system. In a recent publication of the KLOE collaboration the initial state radiation photon had been required… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0606008v2-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/0606008v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0606008v2-abstract-full" style="display: none;"> At the Frascati phi-factory DAPHNE the pion formfactor is measured by means of the 'radiative return', i.e. by using events in which one of the collider electrons (positrons) has radiated an initial state radiation photon, lowering in such a way the invariant mass M_pipi of the two-pion-system. In a recent publication of the KLOE collaboration the initial state radiation photon had been required to be at small polar angles with respect to the beam axis. We are presenting results from a new and complementary analysis in which the photon is tagged at large polar angles. Only like this the threshold region M_pipi^2<0.35 GeV^2 becomes accessible. Moreover, the final state pi+pi-gamma allows to study the phi radiative decay into the scalar particle f_0(980) with f_0(980) \to pi+pi-. For the first time the two-pion mass spectrum could be fitted with different theoretical models for the description of this phi radiative decay. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0606008v2-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0606008v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 June, 2006; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 June, 2006; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2006. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Proceedings of the 41st Rencontres de Moriond, QCD and Hadronic Interactions; La Thuile, March 18-25, 2006; 6 pages; 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0512068">arXiv:hep-ex/0512068</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0512068">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0512068">ps</a>, <a href="https://arxiv.org/format/hep-ex/0512068">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2005.12.045">10.1016/j.physletb.2005.12.045 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of K^+ \to 蟺^0 渭^+ 谓纬decay using stopped kaons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KEK-E470 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+S">S. Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Horie%2C+K">K. Horie</a>, <a href="/search/hep-ex?searchtype=author&query=Aliev%2C+M+A">M. A. Aliev</a>, <a href="/search/hep-ex?searchtype=author&query=Asano%2C+Y">Y. Asano</a>, <a href="/search/hep-ex?searchtype=author&query=Baker%2C+T">T. Baker</a>, <a href="/search/hep-ex?searchtype=author&query=Depommier%2C+P">P. Depommier</a>, <a href="/search/hep-ex?searchtype=author&query=Hasinoff%2C+M">M. Hasinoff</a>, <a href="/search/hep-ex?searchtype=author&query=Igarashi%2C+Y">Y. Igarashi</a>, <a href="/search/hep-ex?searchtype=author&query=Imazato%2C+J">J. Imazato</a>, <a href="/search/hep-ex?searchtype=author&query=Ivashkin%2C+A+P">A. P. Ivashkin</a>, <a href="/search/hep-ex?searchtype=author&query=Khabibullin%2C+M+M">M. M. Khabibullin</a>, <a href="/search/hep-ex?searchtype=author&query=Khotjantsev%2C+A+N">A. N. Khotjantsev</a>, <a href="/search/hep-ex?searchtype=author&query=Kudenko%2C+Y+G">Y. G. Kudenko</a>, <a href="/search/hep-ex?searchtype=author&query=Levchenko%2C+A+S">A. S. Levchenko</a>, <a href="/search/hep-ex?searchtype=author&query=Lim%2C+G+Y">G. Y. Lim</a>, <a href="/search/hep-ex?searchtype=author&query=Macdonald%2C+J+A">J. A. Macdonald</a>, <a href="/search/hep-ex?searchtype=author&query=Mineev%2C+O+V">O. V. Mineev</a>, <a href="/search/hep-ex?searchtype=author&query=Rangacharyulu%2C+C">C. Rangacharyulu</a>, <a href="/search/hep-ex?searchtype=author&query=Sawada%2C+S">S. Sawada</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/0512068v1-abstract-short" style="display: inline;"> The K^+ \to 蟺^0 渭^+ 谓纬($K_{渭3 纬}$) decay has been measured with stopped positive kaons at the KEK 12 GeV proton synchrotron. A $K_{渭3 纬}$ sample containing 125 events was obtained. The partial branching ratio $Br(K_{渭3 纬}, E_纬>30 {\rm MeV}, 胃_{渭^+ 纬}>20^{\circ})$ was found to be $[2.4 \pm 0.5(stat) \pm 0.6(syst)]\times 10^{-5}$, which is in good agreement with theoretical predictions. </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0512068v1-abstract-full" style="display: none;"> The K^+ \to 蟺^0 渭^+ 谓纬($K_{渭3 纬}$) decay has been measured with stopped positive kaons at the KEK 12 GeV proton synchrotron. A $K_{渭3 纬}$ sample containing 125 events was obtained. The partial branching ratio $Br(K_{渭3 纬}, E_纬>30 {\rm MeV}, 胃_{渭^+ 纬}>20^{\circ})$ was found to be $[2.4 \pm 0.5(stat) \pm 0.6(syst)]\times 10^{-5}$, which is in good agreement with theoretical predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0512068v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0512068v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 December, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2005. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 3 figures, to be published in Physics Letters B</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Lett.B633:190-194,2006 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0505019">arXiv:hep-ex/0505019</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0505019">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Recent Results from K2K Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Mariani%2C+C">C. Mariani</a>, <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+f+K">for K2K Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/0505019v1-abstract-short" style="display: inline;"> The latest results from K2K experiment are reported, with focus on muon neutrino oscillation. The results are based on data taken from June 1999 to February 2004, corresponding to 8.9 x 10^19 protons on target. </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0505019v1-abstract-full" style="display: none;"> The latest results from K2K experiment are reported, with focus on muon neutrino oscillation. The results are based on data taken from June 1999 to February 2004, corresponding to 8.9 x 10^19 protons on target. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0505019v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0505019v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 May, 2005; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2005. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 3 figures, 2005 Electroweak session, XXXXth Rencontres de Moriond</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0403005">arXiv:hep-ex/0403005</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0403005">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0403005">ps</a>, <a href="https://arxiv.org/format/hep-ex/0403005">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> KLOE Perspectives for R-Measurements at DAFNE2 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Denig%2C+A+G">Achim G. Denig</a>, <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KLOE Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/0403005v1-abstract-short" style="display: inline;"> As a future upgrade of the Frascati phi factory DAPHNE an increase of the center-of-mass energy of the accelerator up to W=2GeV has been proposed (DAFNE2). In this case the hadronic cross section in the energy range between 1-2 GeV can be measured with the KLOE detector. The feasibility of these measurements and the impact on the hadronic contribution to the anomalous magnetic moment of the muon… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0403005v1-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/0403005v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0403005v1-abstract-full" style="display: none;"> As a future upgrade of the Frascati phi factory DAPHNE an increase of the center-of-mass energy of the accelerator up to W=2GeV has been proposed (DAFNE2). In this case the hadronic cross section in the energy range between 1-2 GeV can be measured with the KLOE detector. The feasibility of these measurements and the impact on the hadronic contribution to the anomalous magnetic moment of the muon are discussed. The possibilities for an energy scan are compared with the radiative return technique, in which the accelerator is running at a fixed center-of-mass energy and ISR-events are taken to lower the invariant mass of the hadronic system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0403005v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0403005v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 March, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2004. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Invited talk at the Workshop on 'e+e- in the 1-2 GeV range', Alghero/Sardinia, Sept. 10-13, 2003 (eConf C030910.1), 4 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> ECONF C0309101:FRWP009,2003 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0311012">arXiv:hep-ex/0311012</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0311012">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0311012">ps</a>, <a href="https://arxiv.org/format/hep-ex/0311012">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> </div> <p class="title is-5 mathjax"> Measurement of the hadronic cross section at DAPHNE with the KLOE detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Denig%2C+A">Achim Denig</a>, <a href="/search/hep-ex?searchtype=author&query=collaboration%2C+K">KLOE collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/0311012v1-abstract-short" style="display: inline;"> We have measured the cross section sigma(e+e- \to pi+pi-gamma) as a function of the pi+pi- invariant mass, M_pipi, with the KLOE detector at DAPHNE (W=m_phi=1.02GeV). The photon in the above process is due to Initial State Radiation. Dividing by a theoretical radiator function we obtain the cross section sigma(e+e- \to pi+pi-) for the mass range 0.37<M_pipi^2<0.93GeV^2. We extract the pion form… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0311012v1-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/0311012v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0311012v1-abstract-full" style="display: none;"> We have measured the cross section sigma(e+e- \to pi+pi-gamma) as a function of the pi+pi- invariant mass, M_pipi, with the KLOE detector at DAPHNE (W=m_phi=1.02GeV). The photon in the above process is due to Initial State Radiation. Dividing by a theoretical radiator function we obtain the cross section sigma(e+e- \to pi+pi-) for the mass range 0.37<M_pipi^2<0.93GeV^2. We extract the pion form factor and the hadronic contribution to the muon anomaly, a_mu. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0311012v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0311012v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 November, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2003. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Proceedings for HADRON2003, Aschaffenburg/Germany, Aug.31-Sept.6 2003, 6 pages, 2figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0306050">arXiv:hep-ex/0306050</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0306050">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0306050">ps</a>, <a href="https://arxiv.org/format/hep-ex/0306050">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physletb.2003.08.028">10.1016/j.physletb.2003.08.028 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> New precision measurement of the $J/蠄$- and $蠄'$ -meson masses </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Aulchenko%2C+V+M">V. M. Aulchenko</a>, <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KEDR Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/0306050v2-abstract-short" style="display: inline;"> A new high precision measurement of the $J/蠄$- and $蠄'$-meson masses has been performed at the VEPP-4M collider using the KEDR detector. The resonant depolarization method has been employed for the absolute calibration of the beam energy. The following mass values have been obtained: $M_{J/蠄} = 3096.917 \pm 0.010 \pm 0.007$ MeV, $M_{蠄'} = 3686.111 \pm 0.025 \pm 0.009$ MeV. The relative mea… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0306050v2-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/0306050v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0306050v2-abstract-full" style="display: none;"> A new high precision measurement of the $J/蠄$- and $蠄'$-meson masses has been performed at the VEPP-4M collider using the KEDR detector. The resonant depolarization method has been employed for the absolute calibration of the beam energy. The following mass values have been obtained: $M_{J/蠄} = 3096.917 \pm 0.010 \pm 0.007$ MeV, $M_{蠄'} = 3686.111 \pm 0.025 \pm 0.009$ MeV. The relative measurement accuracy has reached $4. 10^{-6}$ for $J/蠄$ and $7. 10^{-6}$ for $蠄'$, approximately 3 times better than in the previous precise experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0306050v2-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0306050v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 September, 2003; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 June, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2003. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 4 tables, 10 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Lett.B573:63-79,2003 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0302001">arXiv:hep-ex/0302001</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0302001">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0302001">ps</a>, <a href="https://arxiv.org/format/hep-ex/0302001">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/S0168-9002(03)01363-9">10.1016/S0168-9002(03)01363-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Apparatus for a Search for T-violating Muon Polarization in Stopped-Kaon Decays </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+t+K">the KEK-E246 Collaboration</a>, <a href="/search/hep-ex?searchtype=author&query=%3A"> :</a>, <a href="/search/hep-ex?searchtype=author&query=Abe%2C+M">M. Abe</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/0302001v1-abstract-short" style="display: inline;"> The detector built at KEK to search for T-violating transverse muon polarization in K+ --> pi0 mu+ nu (Kmu3) decay of stopped kaons is described. Sensitivity to the transverse polarization component is obtained from reconstruction of the decay plane by tracking the mu+ through a toroidal spectrometer and detecting the pi0 in a segmented CsI(Tl) photon calorimeter. The muon polarization was obtai… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0302001v1-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/0302001v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0302001v1-abstract-full" style="display: none;"> The detector built at KEK to search for T-violating transverse muon polarization in K+ --> pi0 mu+ nu (Kmu3) decay of stopped kaons is described. Sensitivity to the transverse polarization component is obtained from reconstruction of the decay plane by tracking the mu+ through a toroidal spectrometer and detecting the pi0 in a segmented CsI(Tl) photon calorimeter. The muon polarization was obtained from the decay positron asymmetry of muons stopped in a polarimeter. The detector included features which minimized systematic errors while maintaining high acceptance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0302001v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0302001v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 February, 2003; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2003. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">56 pages, 30 figures, submitted to NIM</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> Preprint INR-1094/2003, KEK Preprint 2002-130, TRI-PP-03-01 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Instrum.Meth..A506:60-91,2003 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0212048">arXiv:hep-ex/0212048</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0212048">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0212048">ps</a>, <a href="https://arxiv.org/format/hep-ex/0212048">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/S0370-2693(02)03236-7">10.1016/S0370-2693(02)03236-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of direct photon emission in $K^+ \to 蟺^+ 蟺^0 纬$ decay using stopped positive kaons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Shimizu%2C+S">Suguru Shimizu</a>, <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+f+K">for KEK-E470 Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/0212048v1-abstract-short" style="display: inline;"> The radiative decay $K^+ \to 蟺^+ 蟺^0 纬$ ($K_{蟺2 纬}$) has been measured with stopped positive kaons. A $K_{蟺2 纬}$ sample containing 4k events was analyzed, and the $K_{蟺2 纬}$ branching ratio of the direct photon emission process was determined to be $[6.1\pm2.5({\rm stat})\pm1.9({\rm syst})]\times 10^{-6}$. No interference pattern with internal bremsstrahlung was observed. </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0212048v1-abstract-full" style="display: none;"> The radiative decay $K^+ \to 蟺^+ 蟺^0 纬$ ($K_{蟺2 纬}$) has been measured with stopped positive kaons. A $K_{蟺2 纬}$ sample containing 4k events was analyzed, and the $K_{蟺2 纬}$ branching ratio of the direct photon emission process was determined to be $[6.1\pm2.5({\rm stat})\pm1.9({\rm syst})]\times 10^{-6}$. No interference pattern with internal bremsstrahlung was observed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0212048v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0212048v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 December, 2002; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2002. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 6 figures, 2 tables, to be published in Phys. Lett. B</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Lett.B554:7-14,2003 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0106006">arXiv:hep-ex/0106006</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0106006">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0106006">ps</a>, <a href="https://arxiv.org/format/hep-ex/0106006">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/S0370-2693(01)00755-9">10.1016/S0370-2693(01)00755-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of $螕(K_{渭3})/螕(K_{e3})$ ratio using stopped positive kaons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Horie%2C+K">Keito Horie</a>, <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KEK-E246 Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/0106006v2-abstract-short" style="display: inline;"> The ratio of the $K^{+}\to 蟺^{0} 渭^{+} 谓$ ($K_{\mu3}^+$) and $K^{+}\to 蟺^{0} e^{+} 谓$ ($K_{e3}^+$) decay widths, $螕(K_{渭3})/螕(K_{e3})$, has been measured with stopped positive kaons. $K_{\mu3}^+$ and $K_{e3}^+$ samples containing 2.4$\times 10^4$ and 4.0$\times 10^4$ events, respectively, were analyzed. The $螕(K_{\mu3})/螕(K_{e3})$ ratio was obtained to be 0.671$\pm$0.007(stat.)$\pm$0.008(syst.)… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0106006v2-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/0106006v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0106006v2-abstract-full" style="display: none;"> The ratio of the $K^{+}\to 蟺^{0} 渭^{+} 谓$ ($K_{\mu3}^+$) and $K^{+}\to 蟺^{0} e^{+} 谓$ ($K_{e3}^+$) decay widths, $螕(K_{渭3})/螕(K_{e3})$, has been measured with stopped positive kaons. $K_{\mu3}^+$ and $K_{e3}^+$ samples containing 2.4$\times 10^4$ and 4.0$\times 10^4$ events, respectively, were analyzed. The $螕(K_{\mu3})/螕(K_{e3})$ ratio was obtained to be 0.671$\pm$0.007(stat.)$\pm$0.008(syst.) calculating the detector acceptance by a Monte Carlo simulation with the assumption of $渭$-$e$ universality in $K_{l3}^+$ decay. The coefficient of the $q^2$ dependent term of the $f_0$ form factor was also determined to be $位_0$=0.022$\pm$0.005(stat.)$\pm$0.004(syst.). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0106006v2-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0106006v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 June, 2001; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 May, 2001; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2001. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Lett.B513:311-318,2001 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0008045">arXiv:hep-ex/0008045</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0008045">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0008045">ps</a>, <a href="https://arxiv.org/format/hep-ex/0008045">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.86.761">10.1103/PhysRevLett.86.761 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study of the KL to PI+PI-GAMMA Direct Emission Vertex </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Belz%2C+J">J. Belz</a>, <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+t+K">the KTeV Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/0008045v1-abstract-short" style="display: inline;"> We have perfomed studies of the KL to PI+PI-GAMMA Direct Emission (DE) and Inner Bremsstrahlung (IB) vertices, based on data collected by KTeV during the 1996 Fermilab fixed target run. We find a1/a2 = -0.737 +- 0.034 GeV^2 for the DE form-factor parameter in the rho-propagator parametrization, and report on fits of the form-factor to linear and quadratic functions as well. We concurrently measu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0008045v1-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/0008045v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0008045v1-abstract-full" style="display: none;"> We have perfomed studies of the KL to PI+PI-GAMMA Direct Emission (DE) and Inner Bremsstrahlung (IB) vertices, based on data collected by KTeV during the 1996 Fermilab fixed target run. We find a1/a2 = -0.737 +- 0.034 GeV^2 for the DE form-factor parameter in the rho-propagator parametrization, and report on fits of the form-factor to linear and quadratic functions as well. We concurrently measure B.R.(KL to PI+PI-GAMMA, E_gamma >20 MeV)/(KL to PI+PI-) = (20.8 +- 0.3)*10^-3, and a KL to PI+PI-GAMMA DE/(DE + IB) branching ratio of 0.683 +- 0.011. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0008045v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0008045v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 August, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2000. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 6 figures, to be submitted to Physical Review Letters</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.86:761-764,2001 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/0004024">arXiv:hep-ex/0004024</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/0004024">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/0004024">ps</a>, <a href="https://arxiv.org/format/hep-ex/0004024">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/S0168-9002(00)00624-0">10.1016/S0168-9002(00)00624-0 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Design, construction, and operation of SciFi tracking detector for K2K experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Suzuki%2C+A">A. Suzuki</a>, <a href="/search/hep-ex?searchtype=author&query=Park%2C+H">H. Park</a>, <a href="/search/hep-ex?searchtype=author&query=collaboration%2C+K">K2K collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/0004024v3-abstract-short" style="display: inline;"> We describe the construction and performance of a scintillating fiber detector used in the near detector for the K2K (KEK to Kamioka, KEK E362) long baseline neutrino oscillation experiment. The detector uses 3.7 m long and 0.692 mm diameter scintillating fiber coupled to image-intensifier tubes (IIT), and a CCD camera readout system. Fiber sheet production and detector construction began in 199… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0004024v3-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/0004024v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/0004024v3-abstract-full" style="display: none;"> We describe the construction and performance of a scintillating fiber detector used in the near detector for the K2K (KEK to Kamioka, KEK E362) long baseline neutrino oscillation experiment. The detector uses 3.7 m long and 0.692 mm diameter scintillating fiber coupled to image-intensifier tubes (IIT), and a CCD camera readout system. Fiber sheet production and detector construction began in 1997, and the detector was commissioned in March, 1999. Results from the first K2K runs confirm good initial performance : position resolution is estimated to be about 0.8 mm, and track finding efficiency is $98 \pm 2$ % for long tracks (i.e., those which intersect more than 5 fiber planes). The hit efficiency was estimated to be $92 \pm 2$ % using cosmic-ray muons, after noise reduction at the offline stage. The possibility of using the detector for particle identification is also discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/0004024v3-abstract-full').style.display = 'none'; document.getElementById('hep-ex/0004024v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 April, 2000; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 April, 2000; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2000. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">In total 21 pages with 18 figures. THis is the proceedings for "The 7th International Conference on Instrumentation for Colliding Beam Physics", held on Hamamatsu, Japan, Nov. 15-19, 1999</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Instrum.Meth.A453:165-176,2000 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/9903048">arXiv:hep-ex/9903048</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/9903048">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/9903048">ps</a>, <a href="https://arxiv.org/format/hep-ex/9903048">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.83.2128">10.1103/PhysRevLett.83.2128 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Light Gluino Search for Decays Containing pi+pi- or pi0 from a Neutral Hadron Beam at Fermilab </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=al%2C+A+A+e">A. Alavi-Harati et al</a>, <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+K">KTeV Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/9903048v1-abstract-short" style="display: inline;"> We report on two null searches, one for the spontaneous appearance of $蟺^+蟺^-$ pairs, another for a single $蟺^0$, consistent with the decay of a long-lived neutral particle into hadrons and an unseen neutral particle. For the lowest level gluon-gluino bound state, known as the $R^0$, we exclude the decays $R^0\to 蟺^+蟺^-\tilde纬$ and $R^0\to 蟺^0\tilde纬$ for the masses of $R^0$ and $\tilde纬$ in the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/9903048v1-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/9903048v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/9903048v1-abstract-full" style="display: none;"> We report on two null searches, one for the spontaneous appearance of $蟺^+蟺^-$ pairs, another for a single $蟺^0$, consistent with the decay of a long-lived neutral particle into hadrons and an unseen neutral particle. For the lowest level gluon-gluino bound state, known as the $R^0$, we exclude the decays $R^0\to 蟺^+蟺^-\tilde纬$ and $R^0\to 蟺^0\tilde纬$ for the masses of $R^0$ and $\tilde纬$ in the theoretically allowed range. In the most interesting $R^0$ mass range, $\leq 3 GeV/c^2$, we exclude $R^0$ lifetimes from $3\times 10^{-10}$ seconds to as high as $10^{-3}$ seconds, assuming perturbative QCD production for the $R^0$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/9903048v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/9903048v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 March, 1999; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 1999. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> RUTGERS 99-12 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.83:2128-2132,1999 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/9903007">arXiv:hep-ex/9903007</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/9903007">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/9903007">ps</a>, <a href="https://arxiv.org/format/hep-ex/9903007">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.83.922">10.1103/PhysRevLett.83.922 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the branching ratio of pi^0 -> e^+e^- using K_L -> 3 pi^0 decays in flight </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+E+%2F+K">E799-II / KTeV Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/9903007v2-abstract-short" style="display: inline;"> The branching ratio of the rare decay pi^0 -> e^+e^- has been measured in E799-II, a rare kaon decay experiment using the KTeV detector at Fermilab. The pi^0's were produced in fully-reconstructed K_L -> 3 pi^0 decays in flight. We observed 275 candidate pi^0 -> e^+e^- events, with an expected background of 21.4 +- 6.2 events which includes the contribution from Dalitz decays. We measured BR(pi^… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/9903007v2-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/9903007v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/9903007v2-abstract-full" style="display: none;"> The branching ratio of the rare decay pi^0 -> e^+e^- has been measured in E799-II, a rare kaon decay experiment using the KTeV detector at Fermilab. The pi^0's were produced in fully-reconstructed K_L -> 3 pi^0 decays in flight. We observed 275 candidate pi^0 -> e^+e^- events, with an expected background of 21.4 +- 6.2 events which includes the contribution from Dalitz decays. We measured BR(pi^0 -> e^+e^-, x>0.95) = (6.09 +- 0.40 +- 0.24) times 10^{-8}, where the first error is statistical and the second systematic. This result is the first significant observation of the excess rate for this decay above the unitarity lower bound. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/9903007v2-abstract-full').style.display = 'none'; document.getElementById('hep-ex/9903007v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 August, 1999; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 March, 1999; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 1999. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">New version shortened to PRL length limit. 5 pages, 4 figures. Published in Phys. Rev. Lett</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-Pub-99/040-E </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.83:922-925,1999 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/9902029">arXiv:hep-ex/9902029</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/9902029">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/9902029">ps</a>, <a href="https://arxiv.org/format/hep-ex/9902029">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.83.917">10.1103/PhysRevLett.83.917 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the Decay KL -> Pi0 Gamma Gamma </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=al%2C+A+A+e">A. Alavi-Harati et. al</a>, <a href="/search/hep-ex?searchtype=author&query=Collaboration%2C+t+K">the KTeV Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/9902029v1-abstract-short" style="display: inline;"> We report on a new measurement of the decay KL -> pi0 gamma gamma by the KTeV experiment at Fermilab. We determine the KL -> pi0 gamma gamma branching ratio to be (1.68 +/- 0.07 +/- 0.08)x10**-6. Our data shows the first evidence for a low-mass gamma gamma signal as predicted by recent O(p**6) chiral perturbation calculations that include vector meson exchange contributions. From our data, we ex… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/9902029v1-abstract-full').style.display = 'inline'; document.getElementById('hep-ex/9902029v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/9902029v1-abstract-full" style="display: none;"> We report on a new measurement of the decay KL -> pi0 gamma gamma by the KTeV experiment at Fermilab. We determine the KL -> pi0 gamma gamma branching ratio to be (1.68 +/- 0.07 +/- 0.08)x10**-6. Our data shows the first evidence for a low-mass gamma gamma signal as predicted by recent O(p**6) chiral perturbation calculations that include vector meson exchange contributions. From our data, we extract a value for the effective vector coupling aV = -0.72 +/- 0.05 +/- 0.06. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/9902029v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/9902029v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 February, 1999; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 1999. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys.Rev.Lett.83:917-921,1999 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/hep-ex/9801005">arXiv:hep-ex/9801005</a> <span> [<a href="https://arxiv.org/pdf/hep-ex/9801005">pdf</a>, <a href="https://arxiv.org/ps/hep-ex/9801005">ps</a>, <a href="https://arxiv.org/format/hep-ex/9801005">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/S0920-5632(98)00088-7">10.1016/S0920-5632(98)00088-7 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Status of the KTeV Experiment at Fermilab </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Ben-David%2C+R">R. Ben-David</a>, <a href="/search/hep-ex?searchtype=author&query=collaboration%2C+r+t+K">representing the KTeV collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="hep-ex/9801005v1-abstract-short" style="display: inline;"> The KTeV experiment is a fixed target experiment at Fermilab. Its primary goal is the search for direct CP violation in the decay of neutral kaons. Its current status and some preliminary results will be discussed. </span> <span class="abstract-full has-text-grey-dark mathjax" id="hep-ex/9801005v1-abstract-full" style="display: none;"> The KTeV experiment is a fixed target experiment at Fermilab. Its primary goal is the search for direct CP violation in the decay of neutral kaons. Its current status and some preliminary results will be discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('hep-ex/9801005v1-abstract-full').style.display = 'none'; document.getElementById('hep-ex/9801005v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 January, 1998; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 1998. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages Latex, 4 figures; to be published in the proceedings of the XVI International Workshop on Weak Interactions and Neutrinos, WIN '97, Capri, Italy, June 22-28, 1997</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> FERMILAB-Conf-97/347-E </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Phys.Proc.Suppl.66:473-477,1998 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 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