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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/2409.10128">arXiv:2409.10128</a> <span> [<a href="https://arxiv.org/pdf/2409.10128">pdf</a>, <a href="https://arxiv.org/format/2409.10128">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"> Shedding light on Dark Sectors with high-energy muons at the NA64 experiment at the CERN SPS </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Andreev%2C+Y+M">Yu. M. Andreev</a>, <a href="/search/hep-ex?searchtype=author&query=Banerjee%2C+D">D. Banerjee</a>, <a href="/search/hep-ex?searchtype=author&query=Oberhauser%2C+B+B">B. Banto Oberhauser</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bisio%2C+P">P. Bisio</a>, <a href="/search/hep-ex?searchtype=author&query=Charitonidis%2C+N">N. Charitonidis</a>, <a href="/search/hep-ex?searchtype=author&query=Crivelli%2C+P">P. Crivelli</a>, <a href="/search/hep-ex?searchtype=author&query=Depero%2C+E">E. Depero</a>, <a href="/search/hep-ex?searchtype=author&query=Dermenev%2C+A+V">A. V. Dermenev</a>, <a href="/search/hep-ex?searchtype=author&query=Donskov%2C+S+V">S. V. Donskov</a>, <a href="/search/hep-ex?searchtype=author&query=Dusaev%2C+R+R">R. R. Dusaev</a>, <a href="/search/hep-ex?searchtype=author&query=Enik%2C+T">T. Enik</a>, <a href="/search/hep-ex?searchtype=author&query=Frolov%2C+V+N">V. N. Frolov</a>, <a href="/search/hep-ex?searchtype=author&query=Gardikiotis%2C+A">A. Gardikiotis</a>, <a href="/search/hep-ex?searchtype=author&query=Gertsenberger%2C+S+V">S. V. Gertsenberger</a>, <a href="/search/hep-ex?searchtype=author&query=Girod%2C+S">S. Girod</a>, <a href="/search/hep-ex?searchtype=author&query=Gninenko%2C+S+N">S. N. Gninenko</a>, <a href="/search/hep-ex?searchtype=author&query=H%C3%B6sgen%2C+M">M. H枚sgen</a>, <a href="/search/hep-ex?searchtype=author&query=Joosten%2C+R">R. Joosten</a>, <a href="/search/hep-ex?searchtype=author&query=Kachanov%2C+V+A">V. A. Kachanov</a>, <a href="/search/hep-ex?searchtype=author&query=Kambar%2C+Y">Y. Kambar</a>, <a href="/search/hep-ex?searchtype=author&query=Karneyeu%2C+A+E">A. E. Karneyeu</a>, <a href="/search/hep-ex?searchtype=author&query=Kasianova%2C+E+A">E. A. Kasianova</a>, <a href="/search/hep-ex?searchtype=author&query=Kekelidze%2C+G">G. Kekelidze</a>, <a href="/search/hep-ex?searchtype=author&query=Ketzer%2C+B">B. Ketzer</a> , et al. (32 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="2409.10128v1-abstract-short" style="display: inline;"> A search for Dark Sectors is performed using the unique M2 beam line at the CERN Super Proton Synchrotron. New particles ($X$) could be produced in the bremsstrahlung-like reaction of high energy 160 GeV muons impinging on an active target, $渭N\rightarrow渭NX$, followed by their decays, $X\rightarrow\text{invisible}$. The experimental signature would be a scattered single muon from the target, with… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.10128v1-abstract-full').style.display = 'inline'; document.getElementById('2409.10128v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.10128v1-abstract-full" style="display: none;"> A search for Dark Sectors is performed using the unique M2 beam line at the CERN Super Proton Synchrotron. New particles ($X$) could be produced in the bremsstrahlung-like reaction of high energy 160 GeV muons impinging on an active target, $渭N\rightarrow渭NX$, followed by their decays, $X\rightarrow\text{invisible}$. The experimental signature would be a scattered single muon from the target, with about less than half of its initial energy and no activity in the sub-detectors located downstream the interaction point. The full sample of the 2022 run is analyzed through the missing energy/momentum channel, with a total statistics of $(1.98\pm0.02)\times10^{10}$ muons on target. We demonstrate that various muon-philic scenarios involving different types of mediators, such as scalar or vector particles, can be probed simultaneously with such a technique. For the vector-case, besides a $L_渭-L_蟿$ $Z'$ vector boson, we also consider an invisibly decaying dark photon ($A'\rightarrow\text{invisible}$). This search is complementary to NA64 running with electrons and positrons, thus, opening the possibility to expand the exploration of the thermal light dark matter parameter space by combining the results obtained with the three beams. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.10128v1-abstract-full').style.display = 'none'; document.getElementById('2409.10128v1-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 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </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">24 pages, 22 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2024-236 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.06982">arXiv:2404.06982</a> <span> [<a href="https://arxiv.org/pdf/2404.06982">pdf</a>, <a href="https://arxiv.org/format/2404.06982">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"> First constraints on the $L_渭-L_蟿$ explanation of the muon $g-2$ anomaly from NA64-$e$ at CERN </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Andreev%2C+Y+M">Yu. M. Andreev</a>, <a href="/search/hep-ex?searchtype=author&query=Antonov%2C+A">A. Antonov</a>, <a href="/search/hep-ex?searchtype=author&query=Banerjee%2C+D">D. Banerjee</a>, <a href="/search/hep-ex?searchtype=author&query=Oberhauser%2C+B+B">B. Banto Oberhauser</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bisio%2C+P">P. Bisio</a>, <a href="/search/hep-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/hep-ex?searchtype=author&query=Charitonidis%2C+N">N. Charitonidis</a>, <a href="/search/hep-ex?searchtype=author&query=Cooke%2C+D">D. Cooke</a>, <a href="/search/hep-ex?searchtype=author&query=Crivelli%2C+P">P. Crivelli</a>, <a href="/search/hep-ex?searchtype=author&query=Depero%2C+E">E. Depero</a>, <a href="/search/hep-ex?searchtype=author&query=Dermenev%2C+A+V">A. V. Dermenev</a>, <a href="/search/hep-ex?searchtype=author&query=Donskov%2C+S+V">S. V. Donskov</a>, <a href="/search/hep-ex?searchtype=author&query=Dusaev%2C+R+R">R. R. Dusaev</a>, <a href="/search/hep-ex?searchtype=author&query=Enik%2C+T">T. Enik</a>, <a href="/search/hep-ex?searchtype=author&query=Frolov%2C+V+N">V. N. Frolov</a>, <a href="/search/hep-ex?searchtype=author&query=Gardikiotis%2C+A">A. Gardikiotis</a>, <a href="/search/hep-ex?searchtype=author&query=Gninenko%2C+S+N">S. N. Gninenko</a>, <a href="/search/hep-ex?searchtype=author&query=H%C3%B6sgen%2C+M">M. H枚sgen</a>, <a href="/search/hep-ex?searchtype=author&query=Kachanov%2C+V+A">V. A. Kachanov</a>, <a href="/search/hep-ex?searchtype=author&query=Kambar%2C+Y">Y. Kambar</a>, <a href="/search/hep-ex?searchtype=author&query=Karneyeu%2C+A+E">A. E. Karneyeu</a>, <a href="/search/hep-ex?searchtype=author&query=Kekelidze%2C+G">G. Kekelidze</a>, <a href="/search/hep-ex?searchtype=author&query=Ketzer%2C+B">B. Ketzer</a>, <a href="/search/hep-ex?searchtype=author&query=Kirpichnikov%2C+D+V">D. V. Kirpichnikov</a> , et al. (36 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="2404.06982v6-abstract-short" style="display: inline;"> The inclusion of an additional $U(1)$ gauge $L_渭-L_蟿$ symmetry would release the tension between the measured and the predicted value of the anomalous muon magnetic moment: this paradigm assumes the existence of a new, light $Z^\prime$ vector boson, with dominant coupling to $渭$ and $蟿$ leptons and interacting with electrons via a loop mechanism. The $L_渭-L_蟿$ model can also explain the Dark Matte… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.06982v6-abstract-full').style.display = 'inline'; document.getElementById('2404.06982v6-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.06982v6-abstract-full" style="display: none;"> The inclusion of an additional $U(1)$ gauge $L_渭-L_蟿$ symmetry would release the tension between the measured and the predicted value of the anomalous muon magnetic moment: this paradigm assumes the existence of a new, light $Z^\prime$ vector boson, with dominant coupling to $渭$ and $蟿$ leptons and interacting with electrons via a loop mechanism. The $L_渭-L_蟿$ model can also explain the Dark Matter relic abundance, by assuming that the $Z'$ boson acts as a "portal" to a new Dark Sector of particles in Nature, not charged under known interactions. In this work we present the results of the $Z'$ search performed by the NA64-$e$ experiment at CERN SPS, that collected $\sim 9\times10^{11}$ 100 GeV electrons impinging on an active thick target. Despite the suppressed $Z'$ production yield with an electron beam, NA64-$e$ provides the first accelerator-based results excluding the $g-2$ preferred band of the $Z'$ parameter space in the 1 keV $ < m_{Z'} \lesssim 2$ MeV range, in complementarity with the limits recently obtained by the NA64-$渭$ experiment with a muon beam. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.06982v6-abstract-full').style.display = 'none'; document.getElementById('2404.06982v6-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 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </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, 5 figures. New version with extended exclusion limits down to 1 keV in Z' mass</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2024-103 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.01708">arXiv:2401.01708</a> <span> [<a href="https://arxiv.org/pdf/2401.01708">pdf</a>, <a href="https://arxiv.org/format/2401.01708">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"> Exploration of the Muon $g-2$ and Light Dark Matter explanations in NA64 with the CERN SPS high energy muon beam </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Andreev%2C+Y+M">Yu. M. Andreev</a>, <a href="/search/hep-ex?searchtype=author&query=Banerjee%2C+D">D. Banerjee</a>, <a href="/search/hep-ex?searchtype=author&query=Oberhauser%2C+B+B">B. Banto Oberhauser</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bisio%2C+P">P. Bisio</a>, <a href="/search/hep-ex?searchtype=author&query=Charitonidis%2C+N">N. Charitonidis</a>, <a href="/search/hep-ex?searchtype=author&query=Crivelli%2C+P">P. Crivelli</a>, <a href="/search/hep-ex?searchtype=author&query=Depero%2C+E">E. Depero</a>, <a href="/search/hep-ex?searchtype=author&query=Dermenev%2C+A+V">A. V. Dermenev</a>, <a href="/search/hep-ex?searchtype=author&query=Donskov%2C+S+V">S. V. Donskov</a>, <a href="/search/hep-ex?searchtype=author&query=Dusaev%2C+R+R">R. R. Dusaev</a>, <a href="/search/hep-ex?searchtype=author&query=Enik%2C+T">T. Enik</a>, <a href="/search/hep-ex?searchtype=author&query=Frolov%2C+V+N">V. N. Frolov</a>, <a href="/search/hep-ex?searchtype=author&query=Silva%2C+R+B+G">R. B. Galleguillos Silva</a>, <a href="/search/hep-ex?searchtype=author&query=Gardikiotis%2C+A">A. Gardikiotis</a>, <a href="/search/hep-ex?searchtype=author&query=Gertsenberger%2C+S+V">S. V. Gertsenberger</a>, <a href="/search/hep-ex?searchtype=author&query=Girod%2C+S">S. Girod</a>, <a href="/search/hep-ex?searchtype=author&query=Gninenko%2C+S+N">S. N. Gninenko</a>, <a href="/search/hep-ex?searchtype=author&query=Hoesgen%2C+M">M. Hoesgen</a>, <a href="/search/hep-ex?searchtype=author&query=Kachanov%2C+V+A">V. A. Kachanov</a>, <a href="/search/hep-ex?searchtype=author&query=Kambar%2C+Y">Y. Kambar</a>, <a href="/search/hep-ex?searchtype=author&query=Karneyeu%2C+A+E">A. E. Karneyeu</a>, <a href="/search/hep-ex?searchtype=author&query=Kasianova%2C+E+A">E. A. Kasianova</a>, <a href="/search/hep-ex?searchtype=author&query=Kekelidze%2C+G">G. Kekelidze</a>, <a href="/search/hep-ex?searchtype=author&query=Ketzer%2C+B">B. Ketzer</a> , et al. (32 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="2401.01708v1-abstract-short" style="display: inline;"> We report on a search for a new $Z'$ ($L_渭-L_蟿$) vector boson performed at the NA64 experiment employing a high energy muon beam and a missing energy-momentum technique. Muons from the M2 beamline at the CERN Super Proton Synchrotron with a momentum of 160 GeV/c are directed to an active target. A signal event is a single scattered muon with momentum $<$ 80 GeV/c in the final state, accompanied by… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.01708v1-abstract-full').style.display = 'inline'; document.getElementById('2401.01708v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.01708v1-abstract-full" style="display: none;"> We report on a search for a new $Z'$ ($L_渭-L_蟿$) vector boson performed at the NA64 experiment employing a high energy muon beam and a missing energy-momentum technique. Muons from the M2 beamline at the CERN Super Proton Synchrotron with a momentum of 160 GeV/c are directed to an active target. A signal event is a single scattered muon with momentum $<$ 80 GeV/c in the final state, accompanied by missing energy, i.e. no detectable activity in the downstream calorimeters. For a total statistic of $(1.98\pm0.02)\times10^{10}$ muons on target, no event is observed in the expected signal region. This allows us to set new limits on part of the remaining $(m_{Z'},\ g_{Z'})$ parameter space which could provide an explanation for the muon $(g-2)_渭$ anomaly. Additionally, our study excludes part of the parameter space suggested by the thermal Dark Matter relic abundance. Our results pave the way to explore Dark Sectors and light Dark Matter with muon beams in a unique and complementary way to other experiments. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.01708v1-abstract-full').style.display = 'none'; document.getElementById('2401.01708v1-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 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </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">Report number:</span> CERN-EP-2023-306 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.15612">arXiv:2308.15612</a> <span> [<a href="https://arxiv.org/pdf/2308.15612">pdf</a>, <a href="https://arxiv.org/format/2308.15612">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"> Probing Light Dark Matter with positron beams at NA64 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Andreev%2C+Y+M">Yu. M. Andreev</a>, <a href="/search/hep-ex?searchtype=author&query=Antonov%2C+A">A. Antonov</a>, <a href="/search/hep-ex?searchtype=author&query=Banerjee%2C+D">D. Banerjee</a>, <a href="/search/hep-ex?searchtype=author&query=Oberhauser%2C+B+B">B. Banto Oberhauser</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bisio%2C+P">P. Bisio</a>, <a href="/search/hep-ex?searchtype=author&query=Bondi%2C+M">M. Bondi</a>, <a href="/search/hep-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/hep-ex?searchtype=author&query=Charitonidis%2C+N">N. Charitonidis</a>, <a href="/search/hep-ex?searchtype=author&query=Cooke%2C+D">D. Cooke</a>, <a href="/search/hep-ex?searchtype=author&query=Crivelli%2C+P">P. Crivelli</a>, <a href="/search/hep-ex?searchtype=author&query=Depero%2C+E">E. Depero</a>, <a href="/search/hep-ex?searchtype=author&query=Dermenev%2C+A+V">A. V. Dermenev</a>, <a href="/search/hep-ex?searchtype=author&query=Donskov%2C+S+V">S. V. Donskov</a>, <a href="/search/hep-ex?searchtype=author&query=Dusaev%2C+R+R">R. R. Dusaev</a>, <a href="/search/hep-ex?searchtype=author&query=Enik%2C+T">T. Enik</a>, <a href="/search/hep-ex?searchtype=author&query=Frolov%2C+V+N">V. N. Frolov</a>, <a href="/search/hep-ex?searchtype=author&query=Gardikiotis%2C+A">A. Gardikiotis</a>, <a href="/search/hep-ex?searchtype=author&query=Gerassimov%2C+S+G">S. G. Gerassimov</a>, <a href="/search/hep-ex?searchtype=author&query=Gninenko%2C+S+N">S. N. Gninenko</a>, <a href="/search/hep-ex?searchtype=author&query=Hosgen%2C+M">M. Hosgen</a>, <a href="/search/hep-ex?searchtype=author&query=Jeckel%2C+M">M. Jeckel</a>, <a href="/search/hep-ex?searchtype=author&query=Kachanov%2C+V+A">V. A. Kachanov</a>, <a href="/search/hep-ex?searchtype=author&query=Kambar%2C+Y">Y. Kambar</a>, <a href="/search/hep-ex?searchtype=author&query=Karneyeu%2C+A+E">A. E. Karneyeu</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="2308.15612v1-abstract-short" style="display: inline;"> We present the results of a missing-energy search for Light Dark Matter which has a new interaction with ordinary matter transmitted by a vector boson, called dark photon $A^\prime$. For the first time, this search is performed with a positron beam by using the significantly enhanced production of $A^\prime$ in the resonant annihilation of positrons with atomic electrons of the target nuclei, foll… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.15612v1-abstract-full').style.display = 'inline'; document.getElementById('2308.15612v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.15612v1-abstract-full" style="display: none;"> We present the results of a missing-energy search for Light Dark Matter which has a new interaction with ordinary matter transmitted by a vector boson, called dark photon $A^\prime$. For the first time, this search is performed with a positron beam by using the significantly enhanced production of $A^\prime$ in the resonant annihilation of positrons with atomic electrons of the target nuclei, followed by the invisible decay of $A^\prime$ into dark matter. No events were found in the signal region with $(10.1 \pm 0.1)~\times~10^{9}$ positrons on target with 100 GeV energy. This allowed us to set new exclusion limits that, relative to the collected statistics, prove the power of this experimental technique. This measurement is a crucial first step toward a future exploration program with positron beams, whose estimated sensitivity is here presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.15612v1-abstract-full').style.display = 'none'; document.getElementById('2308.15612v1-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, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </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 submitted to PRL</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2023-192 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.02404">arXiv:2307.02404</a> <span> [<a href="https://arxiv.org/pdf/2307.02404">pdf</a>, <a href="https://arxiv.org/format/2307.02404">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"> Search for Light Dark Matter with NA64 at CERN </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Andreev%2C+Y+M">Yu. M. Andreev</a>, <a href="/search/hep-ex?searchtype=author&query=Banerjee%2C+D">D. Banerjee</a>, <a href="/search/hep-ex?searchtype=author&query=Oberhauser%2C+B+B">B. Banto Oberhauser</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bisio%2C+P">P. Bisio</a>, <a href="/search/hep-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/hep-ex?searchtype=author&query=Charitonidis%2C+N">N. Charitonidis</a>, <a href="/search/hep-ex?searchtype=author&query=Chumakov%2C+A+G">A. G. Chumakov</a>, <a href="/search/hep-ex?searchtype=author&query=Cooke%2C+D">D. Cooke</a>, <a href="/search/hep-ex?searchtype=author&query=Crivelli%2C+P">P. Crivelli</a>, <a href="/search/hep-ex?searchtype=author&query=Depero%2C+E">E. Depero</a>, <a href="/search/hep-ex?searchtype=author&query=Dermenev%2C+A+V">A. V. Dermenev</a>, <a href="/search/hep-ex?searchtype=author&query=Donskov%2C+S+V">S. V. Donskov</a>, <a href="/search/hep-ex?searchtype=author&query=Dusaev%2C+R+R">R. R. Dusaev</a>, <a href="/search/hep-ex?searchtype=author&query=Enik%2C+T">T. Enik</a>, <a href="/search/hep-ex?searchtype=author&query=Frolov%2C+V+N">V. N. Frolov</a>, <a href="/search/hep-ex?searchtype=author&query=Silva%2C+R+B+G">R. B. Galleguillos Silva</a>, <a href="/search/hep-ex?searchtype=author&query=Gardikiotis%2C+A">A. Gardikiotis</a>, <a href="/search/hep-ex?searchtype=author&query=Gertsenberger%2C+S+V">S. V. Gertsenberger</a>, <a href="/search/hep-ex?searchtype=author&query=Girod%2C+S">S. Girod</a>, <a href="/search/hep-ex?searchtype=author&query=Gninenko%2C+S+N">S. N. Gninenko</a>, <a href="/search/hep-ex?searchtype=author&query=H%22osgen%2C+M">M. H"osgen</a>, <a href="/search/hep-ex?searchtype=author&query=Kachanov%2C+V+A">V. A. Kachanov</a>, <a href="/search/hep-ex?searchtype=author&query=Kambar%2C+Y">Y. Kambar</a>, <a href="/search/hep-ex?searchtype=author&query=Karneyeu%2C+A+E">A. E. Karneyeu</a> , et al. (38 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="2307.02404v1-abstract-short" style="display: inline;"> Thermal dark matter models with particle $蠂$ masses below the electroweak scale can provide an explanation for the observed relic dark matter density. This would imply the existence of a new feeble interaction between the dark and ordinary matter. We report on a new search for the sub-GeV $蠂$ production through the interaction mediated by a new vector boson, called the dark photon $A'$, in collisi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.02404v1-abstract-full').style.display = 'inline'; document.getElementById('2307.02404v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.02404v1-abstract-full" style="display: none;"> Thermal dark matter models with particle $蠂$ masses below the electroweak scale can provide an explanation for the observed relic dark matter density. This would imply the existence of a new feeble interaction between the dark and ordinary matter. We report on a new search for the sub-GeV $蠂$ production through the interaction mediated by a new vector boson, called the dark photon $A'$, in collisions of 100 GeV electrons with the active target of the NA64 experiment at the CERN SPS. With $9.37\times10^{11}$ electrons on target collected during 2016-2022 runs NA64 probes for the first time the well-motivated region of parameter space of benchmark thermal scalar and fermionic dark matter models. No evidence for dark matter production has been found. This allows us to set the most sensitive limits on the $A'$ couplings to photons for masses $m_{A'} \lesssim 0.35$ GeV, and to exclude scalar and Majorana dark matter with the $蠂-A'$ coupling $伪_D \leq 0.1$ for masses $0.001 \lesssim m_蠂\lesssim 0.1$ GeV and $3m_蠂\leq m_{A'}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.02404v1-abstract-full').style.display = 'none'; document.getElementById('2307.02404v1-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 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </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, 7 figures. arXiv admin note: text overlap with arXiv:1906.00176</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2023-130 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.19411">arXiv:2305.19411</a> <span> [<a href="https://arxiv.org/pdf/2305.19411">pdf</a>, <a href="https://arxiv.org/format/2305.19411">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="Accelerator Physics">physics.acc-ph</span> </div> </div> <p class="title is-5 mathjax"> Measurement of the intrinsic hadronic contamination in the NA64$-e$ high-purity $e^+/e^-$ beam at CERN </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Andreev%2C+Y+M">Yu. M. Andreev</a>, <a href="/search/hep-ex?searchtype=author&query=Banerjee%2C+D">D. Banerjee</a>, <a href="/search/hep-ex?searchtype=author&query=Oberhauser%2C+B+B">B. Banto Oberhauser</a>, <a href="/search/hep-ex?searchtype=author&query=Bernhard%2C+J">J. Bernhard</a>, <a href="/search/hep-ex?searchtype=author&query=Bisio%2C+P">P. Bisio</a>, <a href="/search/hep-ex?searchtype=author&query=Bondi%2C+M">M. Bondi</a>, <a href="/search/hep-ex?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/hep-ex?searchtype=author&query=Charitonidis%2C+N">N. Charitonidis</a>, <a href="/search/hep-ex?searchtype=author&query=Chumakov%2C+A+G">A. G. Chumakov</a>, <a href="/search/hep-ex?searchtype=author&query=Cooke%2C+D">D. Cooke</a>, <a href="/search/hep-ex?searchtype=author&query=Crivelli%2C+P">P. Crivelli</a>, <a href="/search/hep-ex?searchtype=author&query=Depero%2C+E">E. Depero</a>, <a href="/search/hep-ex?searchtype=author&query=Dermenev%2C+A+V">A. V. Dermenev</a>, <a href="/search/hep-ex?searchtype=author&query=Donskov%2C+S+V">S. V. Donskov</a>, <a href="/search/hep-ex?searchtype=author&query=Dusaev%2C+R+R">R. R. Dusaev</a>, <a href="/search/hep-ex?searchtype=author&query=Enik%2C+T">T. Enik</a>, <a href="/search/hep-ex?searchtype=author&query=Frolov%2C+V+N">V. N. Frolov</a>, <a href="/search/hep-ex?searchtype=author&query=Gardikiotis%2C+A">A. Gardikiotis</a>, <a href="/search/hep-ex?searchtype=author&query=Gerassimov%2C+S+G">S. G. Gerassimov</a>, <a href="/search/hep-ex?searchtype=author&query=Gninenko%2C+S+N">S. N. Gninenko</a>, <a href="/search/hep-ex?searchtype=author&query=H%22osgen%2C+M">M. H"osgen</a>, <a href="/search/hep-ex?searchtype=author&query=Jeckel%2C+M">M. Jeckel</a>, <a href="/search/hep-ex?searchtype=author&query=Kachanov%2C+V+A">V. A. Kachanov</a>, <a href="/search/hep-ex?searchtype=author&query=Kambar%2C+Y">Y. Kambar</a>, <a href="/search/hep-ex?searchtype=author&query=Karneyeu%2C+A+E">A. E. Karneyeu</a> , et al. (43 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="2305.19411v2-abstract-short" style="display: inline;"> In this study, we present the measurement of the intrinsic hadronic contamination at the CERN SPS H4 beamline configured to transport electrons and positrons at 100 GeV/c momentum. The analysis was performed using data collected by the NA64-$e$ experiment in 2022. Our study is based on calorimetric measurements, exploiting the different interaction mechanisms of electrons and hadrons in the NA64-E… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.19411v2-abstract-full').style.display = 'inline'; document.getElementById('2305.19411v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.19411v2-abstract-full" style="display: none;"> In this study, we present the measurement of the intrinsic hadronic contamination at the CERN SPS H4 beamline configured to transport electrons and positrons at 100 GeV/c momentum. The analysis was performed using data collected by the NA64-$e$ experiment in 2022. Our study is based on calorimetric measurements, exploiting the different interaction mechanisms of electrons and hadrons in the NA64-ECAL and NA64-HCAL detectors. We determined the intrinsic hadronic contamination by comparing the results obtained using the nominal electron/positron beamline configuration with those obtained in a dedicated setup, in which only hadrons impinged on the detector. The significant differences in the experimental signatures of electrons and hadrons motivated our approach, resulting in a small and well-controlled systematic uncertainty for the measurement. Our study allowed us to precisely determine the intrinsic hadronic contamination, which represents a crucial parameter for the NA64 experiment in which the hadron contaminants may result in non-trivial backgrounds. Moreover, we performed dedicated Monte Carlo simulations for the hadron production induced by the primary T2 target. We found a good agreement between measurements and simulation results, confirming the validity of the applied methodology and our evaluation of the intrinsic hadronic contamination. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.19411v2-abstract-full').style.display = 'none'; document.getElementById('2305.19411v2-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 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> CERN-EP-2023-108 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2102.00442">arXiv:2102.00442</a> <span> [<a href="https://arxiv.org/pdf/2102.00442">pdf</a>, <a href="https://arxiv.org/format/2102.00442">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> <p class="title is-5 mathjax"> Conceptual design of the Spin Physics Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/hep-ex?searchtype=author&query=Abazov%2C+V+M">V. M. Abazov</a>, <a href="/search/hep-ex?searchtype=author&query=Abramov%2C+V">V. Abramov</a>, <a href="/search/hep-ex?searchtype=author&query=Afanasyev%2C+L+G">L. G. Afanasyev</a>, <a href="/search/hep-ex?searchtype=author&query=Akhunzyanov%2C+R+R">R. R. Akhunzyanov</a>, <a href="/search/hep-ex?searchtype=author&query=Akindinov%2C+A+V">A. V. Akindinov</a>, <a href="/search/hep-ex?searchtype=author&query=Akopov%2C+N">N. Akopov</a>, <a href="/search/hep-ex?searchtype=author&query=Alekseev%2C+I+G">I. G. Alekseev</a>, <a href="/search/hep-ex?searchtype=author&query=Aleshko%2C+A+M">A. M. Aleshko</a>, <a href="/search/hep-ex?searchtype=author&query=Alexakhin%2C+V+Y">V. Yu. Alexakhin</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+G+D">G. D. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Alexeev%2C+M">M. Alexeev</a>, <a href="/search/hep-ex?searchtype=author&query=Amoroso%2C+A">A. Amoroso</a>, <a href="/search/hep-ex?searchtype=author&query=Anikin%2C+I+V">I. V. Anikin</a>, <a href="/search/hep-ex?searchtype=author&query=Andreev%2C+V+F">V. F. Andreev</a>, <a href="/search/hep-ex?searchtype=author&query=Anosov%2C+V+A">V. A. Anosov</a>, <a href="/search/hep-ex?searchtype=author&query=Arbuzov%2C+A+B">A. B. Arbuzov</a>, <a href="/search/hep-ex?searchtype=author&query=Azorskiy%2C+N+I">N. I. Azorskiy</a>, <a href="/search/hep-ex?searchtype=author&query=Baldin%2C+A+A">A. A. Baldin</a>, <a href="/search/hep-ex?searchtype=author&query=Balandina%2C+V+V">V. V. Balandina</a>, <a href="/search/hep-ex?searchtype=author&query=Baldina%2C+E+G">E. G. Baldina</a>, <a href="/search/hep-ex?searchtype=author&query=Barabanov%2C+M+Y">M. Yu. Barabanov</a>, <a href="/search/hep-ex?searchtype=author&query=Barsov%2C+S+G">S. G. Barsov</a>, <a href="/search/hep-ex?searchtype=author&query=Baskov%2C+V+A">V. A. Baskov</a>, <a href="/search/hep-ex?searchtype=author&query=Beloborodov%2C+A+N">A. N. Beloborodov</a>, <a href="/search/hep-ex?searchtype=author&query=Belov%2C+I+N">I. N. Belov</a> , et al. (270 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="2102.00442v3-abstract-short" style="display: inline;"> The Spin Physics Detector, a universal facility for studying the nucleon spin structure and other spin-related phenomena with polarized proton and deuteron beams, is proposed to be placed in one of the two interaction points of the NICA collider that is under construction at the Joint Institute for Nuclear Research (Dubna, Russia). At the heart of the project there is huge experience with polarize… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.00442v3-abstract-full').style.display = 'inline'; document.getElementById('2102.00442v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2102.00442v3-abstract-full" style="display: none;"> The Spin Physics Detector, a universal facility for studying the nucleon spin structure and other spin-related phenomena with polarized proton and deuteron beams, is proposed to be placed in one of the two interaction points of the NICA collider that is under construction at the Joint Institute for Nuclear Research (Dubna, Russia). At the heart of the project there is huge experience with polarized beams at JINR. The main objective of the proposed experiment is the comprehensive study of the unpolarized and polarized gluon content of the nucleon. Spin measurements at the Spin Physics Detector at the NICA collider have bright perspectives to make a unique contribution and challenge our understanding of the spin structure of the nucleon. In this document the Conceptual Design of the Spin Physics Detector is presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2102.00442v3-abstract-full').style.display = 'none'; document.getElementById('2102.00442v3-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, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2021. </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 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