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<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/2310.11902">arXiv:2310.11902</a> <span> [<a href="https://arxiv.org/pdf/2310.11902">pdf</a>, <a href="https://arxiv.org/format/2310.11902">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"> Operation and performance of MEG II detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=MEG+II+Collaboration"> MEG II Collaboration</a>, <a href="/search/physics?searchtype=author&query=Afanaciev%2C+K">K. Afanaciev</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Ban%2C+S">S. Ban</a>, <a href="/search/physics?searchtype=author&query=Baranov%2C+V">V. Baranov</a>, <a href="/search/physics?searchtype=author&query=Benmansour%2C+H">H. Benmansour</a>, <a href="/search/physics?searchtype=author&query=Biasotti%2C+M">M. Biasotti</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Chiappini%2C+M">M. Chiappini</a>, <a href="/search/physics?searchtype=author&query=Chiarello%2C+G">G. Chiarello</a>, <a href="/search/physics?searchtype=author&query=Corvaglia%2C+A">A. Corvaglia</a>, <a href="/search/physics?searchtype=author&query=Cuna%2C+F">F. Cuna</a>, <a href="/search/physics?searchtype=author&query=Maso%2C+G+D">G. Dal Maso</a>, <a href="/search/physics?searchtype=author&query=De+Bari%2C+A">A. De Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Barusso%2C+L+F">L. Ferrari Barusso</a>, <a href="/search/physics?searchtype=author&query=Francesconi%2C+M">M. Francesconi</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Gallucci%2C+G">G. Gallucci</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Gerritzen%2C+L">L. Gerritzen</a>, <a href="/search/physics?searchtype=author&query=Grancagnolo%2C+F">F. Grancagnolo</a> , et al. (60 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="2310.11902v3-abstract-short" style="display: inline;"> The MEG II experiment, located at the Paul Scherrer Institut (PSI) in Switzerland, is the successor to the MEG experiment, which completed data taking in 2013. MEG II started fully operational data taking in 2021, with the goal of improving the sensitivity of the mu+ -> e+ gamma decay down to 6e-14 almost an order of magnitude better than the current limit. In this paper, we describe the operation… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.11902v3-abstract-full').style.display = 'inline'; document.getElementById('2310.11902v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.11902v3-abstract-full" style="display: none;"> The MEG II experiment, located at the Paul Scherrer Institut (PSI) in Switzerland, is the successor to the MEG experiment, which completed data taking in 2013. MEG II started fully operational data taking in 2021, with the goal of improving the sensitivity of the mu+ -> e+ gamma decay down to 6e-14 almost an order of magnitude better than the current limit. In this paper, we describe the operation and performance of the experiment and give a new estimate of its sensitivity versus data acquisition time. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.11902v3-abstract-full').style.display = 'none'; document.getElementById('2310.11902v3-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 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 October, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">42 pages, 55 figures. Submitted to EPJC</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.15253">arXiv:2308.15253</a> <span> [<a href="https://arxiv.org/pdf/2308.15253">pdf</a>, <a href="https://arxiv.org/format/2308.15253">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"> Development of a SciFi-based beam monitor for COMET </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Xu%2C+Y">Yu Xu</a>, <a href="/search/physics?searchtype=author&query=Ning%2C+Y">Yunsong Ning</a>, <a href="/search/physics?searchtype=author&query=Qin%2C+Z">Zhizhen Qin</a>, <a href="/search/physics?searchtype=author&query=Teng%2C+Y">Yao Teng</a>, <a href="/search/physics?searchtype=author&query=Feng%2C+C">Changqing Feng</a>, <a href="/search/physics?searchtype=author&query=Tang%2C+J">Jian Tang</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+Y">Yu Chen</a>, <a href="/search/physics?searchtype=author&query=Fukao%2C+Y">Yoshinori Fukao</a>, <a href="/search/physics?searchtype=author&query=Mihara%2C+S">Satoshi Mihara</a>, <a href="/search/physics?searchtype=author&query=Oishi%2C+K">Kou Oishi</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="2308.15253v2-abstract-short" style="display: inline;"> COMET is a leading experiment to search for coherent conversion of $渭^- \mathrm{N}\to e^- \mathrm{N}$ with a high-intensity pulsed muon beamline, produced by the innovative slow extraction techniques. Therefore, it is critical to measure the characteristics of the muon beam. We set up a Muon Beam Monitor (MBM), where scintillation fibers (SciFi) weaved in the cross shape are coupled to silicon pho… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.15253v2-abstract-full').style.display = 'inline'; document.getElementById('2308.15253v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.15253v2-abstract-full" style="display: none;"> COMET is a leading experiment to search for coherent conversion of $渭^- \mathrm{N}\to e^- \mathrm{N}$ with a high-intensity pulsed muon beamline, produced by the innovative slow extraction techniques. Therefore, it is critical to measure the characteristics of the muon beam. We set up a Muon Beam Monitor (MBM), where scintillation fibers (SciFi) weaved in the cross shape are coupled to silicon photomultipliers (SiPM), to measure the spatial profile and timing structure of the extracted muon beam for COMET. The MBM detector has been tested successfully with a proton beamline in China Spallation Neutron Source (CSNS) and taken data with good performance in the commissioning run called COMET Phase-$伪$. Experience of the MBM development, such as the mechanical structure and electronics readout, and its beam measurement results will be shared. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.15253v2-abstract-full').style.display = 'none'; document.getElementById('2308.15253v2-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, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.07622">arXiv:2203.07622</a> <span> [<a href="https://arxiv.org/pdf/2203.07622">pdf</a>, <a href="https://arxiv.org/format/2203.07622">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</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="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> The International Linear Collider: Report to Snowmass 2021 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Aryshev%2C+A">Alexander Aryshev</a>, <a href="/search/physics?searchtype=author&query=Behnke%2C+T">Ties Behnke</a>, <a href="/search/physics?searchtype=author&query=Berggren%2C+M">Mikael Berggren</a>, <a href="/search/physics?searchtype=author&query=Brau%2C+J">James Brau</a>, <a href="/search/physics?searchtype=author&query=Craig%2C+N">Nathaniel Craig</a>, <a href="/search/physics?searchtype=author&query=Freitas%2C+A">Ayres Freitas</a>, <a href="/search/physics?searchtype=author&query=Gaede%2C+F">Frank Gaede</a>, <a href="/search/physics?searchtype=author&query=Gessner%2C+S">Spencer Gessner</a>, <a href="/search/physics?searchtype=author&query=Gori%2C+S">Stefania Gori</a>, <a href="/search/physics?searchtype=author&query=Grojean%2C+C">Christophe Grojean</a>, <a href="/search/physics?searchtype=author&query=Heinemeyer%2C+S">Sven Heinemeyer</a>, <a href="/search/physics?searchtype=author&query=Jeans%2C+D">Daniel Jeans</a>, <a href="/search/physics?searchtype=author&query=Kruger%2C+K">Katja Kruger</a>, <a href="/search/physics?searchtype=author&query=List%2C+B">Benno List</a>, <a href="/search/physics?searchtype=author&query=List%2C+J">Jenny List</a>, <a href="/search/physics?searchtype=author&query=Liu%2C+Z">Zhen Liu</a>, <a href="/search/physics?searchtype=author&query=Michizono%2C+S">Shinichiro Michizono</a>, <a href="/search/physics?searchtype=author&query=Miller%2C+D+W">David W. Miller</a>, <a href="/search/physics?searchtype=author&query=Moult%2C+I">Ian Moult</a>, <a href="/search/physics?searchtype=author&query=Murayama%2C+H">Hitoshi Murayama</a>, <a href="/search/physics?searchtype=author&query=Nakada%2C+T">Tatsuya Nakada</a>, <a href="/search/physics?searchtype=author&query=Nanni%2C+E">Emilio Nanni</a>, <a href="/search/physics?searchtype=author&query=Nojiri%2C+M">Mihoko Nojiri</a>, <a href="/search/physics?searchtype=author&query=Padamsee%2C+H">Hasan Padamsee</a>, <a href="/search/physics?searchtype=author&query=Perelstein%2C+M">Maxim Perelstein</a> , et al. (487 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="2203.07622v3-abstract-short" style="display: inline;"> The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This docu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.07622v3-abstract-full').style.display = 'inline'; document.getElementById('2203.07622v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.07622v3-abstract-full" style="display: none;"> The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This document brings the story of the ILC up to date, emphasizing its strong physics motivation, its readiness for construction, and the opportunity it presents to the US and the global particle physics community. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.07622v3-abstract-full').style.display = 'none'; document.getElementById('2203.07622v3-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 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 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">356 pages, Large pdf file (40 MB) submitted to Snowmass 2021; v2 references to Snowmass contributions added, additional authors; v3 references added, some updates, additional authors</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> DESY-22-045, IFT--UAM/CSIC--22-028, KEK Preprint 2021-61, PNNL-SA-160884, SLAC-PUB-17662 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.05505">arXiv:2203.05505</a> <span> [<a href="https://arxiv.org/pdf/2203.05505">pdf</a>, <a href="https://arxiv.org/format/2203.05505">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> <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"> Testing Lepton Flavor Universality and CKM Unitarity with Rare Pion Decays in the PIONEER experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=PIONEER+Collaboration"> PIONEER Collaboration</a>, <a href="/search/physics?searchtype=author&query=Altmannshofer%2C+W">W. Altmannshofer</a>, <a href="/search/physics?searchtype=author&query=Binney%2C+H">H. Binney</a>, <a href="/search/physics?searchtype=author&query=Blucher%2C+E">E. Blucher</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D">D. Bryman</a>, <a href="/search/physics?searchtype=author&query=Caminada%2C+L">L. Caminada</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+S">S. Chen</a>, <a href="/search/physics?searchtype=author&query=Cirigliano%2C+V">V. Cirigliano</a>, <a href="/search/physics?searchtype=author&query=Corrodi%2C+S">S. Corrodi</a>, <a href="/search/physics?searchtype=author&query=Crivellin%2C+A">A. Crivellin</a>, <a href="/search/physics?searchtype=author&query=Cuen-Rochin%2C+S">S. Cuen-Rochin</a>, <a href="/search/physics?searchtype=author&query=Di+Canto%2C+A">A. Di Canto</a>, <a href="/search/physics?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/physics?searchtype=author&query=Gaponenko%2C+A">A. Gaponenko</a>, <a href="/search/physics?searchtype=author&query=Garcia%2C+A">A. Garcia</a>, <a href="/search/physics?searchtype=author&query=Gibbons%2C+L">L. Gibbons</a>, <a href="/search/physics?searchtype=author&query=Glaser%2C+C">C. Glaser</a>, <a href="/search/physics?searchtype=author&query=Godoy%2C+M+E">M. Escobar Godoy</a>, <a href="/search/physics?searchtype=author&query=G%C3%B6ldi%2C+D">D. G枚ldi</a>, <a href="/search/physics?searchtype=author&query=Gori%2C+S">S. Gori</a>, <a href="/search/physics?searchtype=author&query=Gorringe%2C+T">T. Gorringe</a>, <a href="/search/physics?searchtype=author&query=Hertzog%2C+D">D. Hertzog</a>, <a href="/search/physics?searchtype=author&query=Hodge%2C+Z">Z. Hodge</a>, <a href="/search/physics?searchtype=author&query=Hoferichter%2C+M">M. Hoferichter</a>, <a href="/search/physics?searchtype=author&query=Ito%2C+S">S. Ito</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="2203.05505v1-abstract-short" style="display: inline;"> The physics motivation and the conceptual design of the PIONEER experiment, a next-generation rare pion decay experiment testing lepton flavor universality and CKM unitarity, are described. Phase I of the PIONEER experiment, which was proposed and approved at Paul Scherrer Institut, aims at measuring the charged-pion branching ratio to electrons vs.\ muons, $R_{e/渭}$, 15 times more precisely than… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.05505v1-abstract-full').style.display = 'inline'; document.getElementById('2203.05505v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.05505v1-abstract-full" style="display: none;"> The physics motivation and the conceptual design of the PIONEER experiment, a next-generation rare pion decay experiment testing lepton flavor universality and CKM unitarity, are described. Phase I of the PIONEER experiment, which was proposed and approved at Paul Scherrer Institut, aims at measuring the charged-pion branching ratio to electrons vs.\ muons, $R_{e/渭}$, 15 times more precisely than the current experimental result, reaching the precision of the Standard Model (SM) prediction at 1 part in $10^4$. Considering several inconsistencies between the SM predictions and data pointing towards the potential violation of lepton flavor universality, the PIONEER experiment will probe non-SM explanations of these anomalies through sensitivity to quantum effects of new particles up to the PeV mass scale. The later phases of the PIONEER experiment aim at improving the experimental precision of the branching ratio of pion beta decay (BRPB), $蟺^+\to 蟺^0 e^+ 谓(纬)$, currently at $1.036(6)\times10^{-8}$, by a factor of three (Phase II) and an order of magnitude (Phase III). Such precise measurements of BRPB will allow for tests of CKM unitarity in light of the Cabibbo Angle Anomaly and the theoretically cleanest extraction of $|V_{ud}|$ at the 0.02\% level, comparable to the deduction from superallowed beta decays. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.05505v1-abstract-full').style.display = 'none'; document.getElementById('2203.05505v1-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 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">contribution to Snowmass 2021 based on the PIONEER proposal (arXiv:2203.01981)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.01981">arXiv:2203.01981</a> <span> [<a href="https://arxiv.org/pdf/2203.01981">pdf</a>, <a href="https://arxiv.org/format/2203.01981">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> <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"> PIONEER: Studies of Rare Pion Decays </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=PIONEER+Collaboration"> PIONEER Collaboration</a>, <a href="/search/physics?searchtype=author&query=Altmannshofer%2C+W">W. Altmannshofer</a>, <a href="/search/physics?searchtype=author&query=Binney%2C+H">H. Binney</a>, <a href="/search/physics?searchtype=author&query=Blucher%2C+E">E. Blucher</a>, <a href="/search/physics?searchtype=author&query=Bryman%2C+D">D. Bryman</a>, <a href="/search/physics?searchtype=author&query=Caminada%2C+L">L. Caminada</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+S">S. Chen</a>, <a href="/search/physics?searchtype=author&query=Cirigliano%2C+V">V. Cirigliano</a>, <a href="/search/physics?searchtype=author&query=Corrodi%2C+S">S. Corrodi</a>, <a href="/search/physics?searchtype=author&query=Crivellin%2C+A">A. Crivellin</a>, <a href="/search/physics?searchtype=author&query=Cuen-Rochin%2C+S">S. Cuen-Rochin</a>, <a href="/search/physics?searchtype=author&query=DiCanto%2C+A">A. DiCanto</a>, <a href="/search/physics?searchtype=author&query=Doria%2C+L">L. Doria</a>, <a href="/search/physics?searchtype=author&query=Gaponenko%2C+A">A. Gaponenko</a>, <a href="/search/physics?searchtype=author&query=Garcia%2C+A">A. Garcia</a>, <a href="/search/physics?searchtype=author&query=Gibbons%2C+L">L. Gibbons</a>, <a href="/search/physics?searchtype=author&query=Glaser%2C+C">C. Glaser</a>, <a href="/search/physics?searchtype=author&query=Godoy%2C+M+E">M. Escobar Godoy</a>, <a href="/search/physics?searchtype=author&query=G%C3%B6ldi%2C+D">D. G枚ldi</a>, <a href="/search/physics?searchtype=author&query=Gori%2C+S">S. Gori</a>, <a href="/search/physics?searchtype=author&query=Gorringe%2C+T">T. Gorringe</a>, <a href="/search/physics?searchtype=author&query=Hertzog%2C+D">D. Hertzog</a>, <a href="/search/physics?searchtype=author&query=Hodge%2C+Z">Z. Hodge</a>, <a href="/search/physics?searchtype=author&query=Hoferichter%2C+M">M. Hoferichter</a>, <a href="/search/physics?searchtype=author&query=Ito%2C+S">S. Ito</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="2203.01981v2-abstract-short" style="display: inline;"> A next-generation rare pion decay experiment, PIONEER, is strongly motivated by several inconsistencies between Standard Model (SM) predictions and data pointing towards the potential violation of lepton flavor universality. It will probe non-SM explanations of these anomalies through sensitivity to quantum effects of new particles even if their masses are at very high scales. Measurement of the c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.01981v2-abstract-full').style.display = 'inline'; document.getElementById('2203.01981v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.01981v2-abstract-full" style="display: none;"> A next-generation rare pion decay experiment, PIONEER, is strongly motivated by several inconsistencies between Standard Model (SM) predictions and data pointing towards the potential violation of lepton flavor universality. It will probe non-SM explanations of these anomalies through sensitivity to quantum effects of new particles even if their masses are at very high scales. Measurement of the charged-pion branching ratio to electrons vs. muons $R_{e/渭}$ is extremely sensitive to new physics effects. At present, the SM prediction for $R_{e/渭}$ is known to 1 part in $10^4$, which is 15 times more precise than the current experimental result. An experiment reaching the theoretical accuracy will test lepton flavor universality at an unprecedented level, probing mass scales up to the PeV range. Measurement of pion beta decay, $蟺^+\to 蟺^0 e^+ 谓(纬)$, with 3 to 10-fold improvement in sensitivity, will determine $V_{ud}$ in a theoretically pristine manner and test CKM unitarity, which is very important in light of the recently emerged tensions. In addition, various exotic rare decays involving sterile neutrinos and axions will be searched for with unprecedented sensitivity. The experiment design benefits from experience with the recent PIENU and PEN experiments at TRIUMF and the Paul Scherrer Institut (PSI). Excellent energy and time resolutions, greatly increased calorimeter depth, high-speed detector and electronics response, large solid angle coverage, and complete event reconstruction are all critical aspects of the approach. The PIONEER experiment design includes a 3$蟺$ sr 25 radiation length calorimeter, a segmented low gain avalanche detector stopping target, a positron tracker, and other detectors. Using intense pion beams, and state-of-the-art instrumentation and computational resources, the experiments can be performed at the PSI ring cyclotron. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.01981v2-abstract-full').style.display = 'none'; document.getElementById('2203.01981v2-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 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.10767">arXiv:2107.10767</a> <span> [<a href="https://arxiv.org/pdf/2107.10767">pdf</a>, <a href="https://arxiv.org/format/2107.10767">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/10.3390/sym13091591">10.3390/sym13091591 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Search for $渭^+\to e^+ 纬$ with 10$^{-14}$ Sensitivity: the Upgrade of the MEG Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=The+MEG+II+Collaboration"> The MEG II Collaboration</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">Alessandro M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Baranov%2C+V">Vladimir Baranov</a>, <a href="/search/physics?searchtype=author&query=Biasotti%2C+M">Michele Biasotti</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">Gianluigi Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">Paolo W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">Gianluca Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">Fabrizio Cei</a>, <a href="/search/physics?searchtype=author&query=Chiappini%2C+M">Marco Chiappini</a>, <a href="/search/physics?searchtype=author&query=Chiarello%2C+G">Gianluigi Chiarello</a>, <a href="/search/physics?searchtype=author&query=Corvaglia%2C+A">Alessandro Corvaglia</a>, <a href="/search/physics?searchtype=author&query=Cuna%2C+F">Federica Cuna</a>, <a href="/search/physics?searchtype=author&query=Maso%2C+G+d">Giovanni dal Maso</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">Antonio de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">Matteo De Gerone</a>, <a href="/search/physics?searchtype=author&query=Francesconi%2C+M">Marco Francesconi</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">Luca Galli</a>, <a href="/search/physics?searchtype=author&query=Gallucci%2C+G">Giovanni Gallucci</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">Flavio Gatti</a>, <a href="/search/physics?searchtype=author&query=Grancagnolo%2C+F">Francesco Grancagnolo</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">Marco Grassi</a>, <a href="/search/physics?searchtype=author&query=Grigoriev%2C+D+N">Dmitry N. Grigoriev</a>, <a href="/search/physics?searchtype=author&query=Hildebrandt%2C+M">Malte Hildebrandt</a>, <a href="/search/physics?searchtype=author&query=Ieki%2C+K">Kei Ieki</a>, <a href="/search/physics?searchtype=author&query=Ignatov%2C+F">Fedor Ignatov</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="2107.10767v2-abstract-short" style="display: inline;"> The MEG experiment took data at the Paul Scherrer Institute in the years 2009--2013 to test the violation of the lepton flavour conservation law, which originates from an accidental symmetry that the Standard Model of elementary particle physics has, and published the most stringent limit on the charged lepton flavour violating decay $渭^+ \rightarrow {\rm e}^+ 纬$: BR($渭^+ \rightarrow {\rm e}^+ 纬$)… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.10767v2-abstract-full').style.display = 'inline'; document.getElementById('2107.10767v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.10767v2-abstract-full" style="display: none;"> The MEG experiment took data at the Paul Scherrer Institute in the years 2009--2013 to test the violation of the lepton flavour conservation law, which originates from an accidental symmetry that the Standard Model of elementary particle physics has, and published the most stringent limit on the charged lepton flavour violating decay $渭^+ \rightarrow {\rm e}^+ 纬$: BR($渭^+ \rightarrow {\rm e}^+ 纬$) $<4.2 \times 10^{-13}$ at 90% confidence level. The MEG detector has been upgraded in order to reach a sensitivity of $6\times10^{-14}$. The basic principle of MEG II is to achieve the highest possible sensitivity using the full muon beam intensity at the Paul Scherrer Institute ($7\times10^{7}$ muons/s) with an upgraded detector. The main improvements are better rate capability of all sub-detectors and improved resolutions while keeping the same detector concept. In this paper, we present the current status of the preparation, integration and commissioning of the MEG II detector in the recent engineering runs. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.10767v2-abstract-full').style.display = 'none'; document.getElementById('2107.10767v2-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 September, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">12 pages, 4 figures. The version of acceptance for Symmetry</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Symmetry 2021, 13(9), 1591 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2011.12529">arXiv:2011.12529</a> <span> [<a href="https://arxiv.org/pdf/2011.12529">pdf</a>, <a href="https://arxiv.org/ps/2011.12529">ps</a>, <a href="https://arxiv.org/format/2011.12529">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> </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/10.1109/TNS.2021.3085100">10.1109/TNS.2021.3085100 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Gigabit Ethernet Daisy-Chain on FPGA for COMET Read-out Electronics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hamada%2C+E">Eitaro Hamada</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Yuki Fujii</a>, <a href="/search/physics?searchtype=author&query=Igarashi%2C+Y">Youichi Igarashi</a>, <a href="/search/physics?searchtype=author&query=Ikeno%2C+M">Masahiro Ikeno</a>, <a href="/search/physics?searchtype=author&query=Mihara%2C+S">Satoshi Mihara</a>, <a href="/search/physics?searchtype=author&query=Nishiguchi%2C+H">Hajime Nishiguchi</a>, <a href="/search/physics?searchtype=author&query=Oishi%2C+K">Kou Oishi</a>, <a href="/search/physics?searchtype=author&query=Uchida%2C+T">Tomohisa Uchida</a>, <a href="/search/physics?searchtype=author&query=Ueno%2C+K">Kazuki Ueno</a>, <a href="/search/physics?searchtype=author&query=Yamaguchi%2C+H">Hiroshi Yamaguchi</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="2011.12529v2-abstract-short" style="display: inline;"> The COMET experiment at J-PARC aims to search for the neutrinoless transition of a muon to an electron. We have developed the readout electronics board called ROESTI for the COMET straw tube tracker. We plan to install the ROESTI in the gas manifold of the detector. The number of vacuum feedthroughs needs to be reduced due to space constraints and cost limitations. In order to decrease the number… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.12529v2-abstract-full').style.display = 'inline'; document.getElementById('2011.12529v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2011.12529v2-abstract-full" style="display: none;"> The COMET experiment at J-PARC aims to search for the neutrinoless transition of a muon to an electron. We have developed the readout electronics board called ROESTI for the COMET straw tube tracker. We plan to install the ROESTI in the gas manifold of the detector. The number of vacuum feedthroughs needs to be reduced due to space constraints and cost limitations. In order to decrease the number of vacuum feedthroughs drastically, we developed a network processor with a daisy-chain function of Gigabit Ethernet for the FPGA on the ROESTI. We implemented two SiTCPs, which are hardware-based TCP processors for Gigabit Ethernet, in the network processor. We also added the data path controllers which handle the Ethernet frames and the event data. The network processor enables ROESTI to process the slow control over UDP/IP and to transfer event data over TCP/IP. By using the network processor, we measured the throughput, the stability, and the data loss rate for two to six ROESTIs. In any number of boards, the throughput of the event data transfer achieved the theoretical limit of TCP over the Gigabit Ethernet stably and ROESTI stably sent 100% of the data. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2011.12529v2-abstract-full').style.display = 'none'; document.getElementById('2011.12529v2-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 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 November, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2020. </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">IEEE Real Time 2020 Conference, 8 pages, 17 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/2010.16203">arXiv:2010.16203</a> <span> [<a href="https://arxiv.org/pdf/2010.16203">pdf</a>, <a href="https://arxiv.org/format/2010.16203">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> </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/10.1109/TNS.2021.3084624">10.1109/TNS.2021.3084624 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> An FPGA-based Trigger System with Online Track Recognition in COMET Phase-I </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Nakazawa%2C+Y">Yu Nakazawa</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Yuki Fujii</a>, <a href="/search/physics?searchtype=author&query=Ikeno%2C+M">Masahiro Ikeno</a>, <a href="/search/physics?searchtype=author&query=Kuno%2C+Y">Yoshitaka Kuno</a>, <a href="/search/physics?searchtype=author&query=Lee%2C+M">MyeongJae Lee</a>, <a href="/search/physics?searchtype=author&query=Mihara%2C+S">Satoshi Mihara</a>, <a href="/search/physics?searchtype=author&query=Shoji%2C+M">Masayoshi Shoji</a>, <a href="/search/physics?searchtype=author&query=Uchida%2C+T">Tomohisa Uchida</a>, <a href="/search/physics?searchtype=author&query=Ueno%2C+K">Kazuki Ueno</a>, <a href="/search/physics?searchtype=author&query=Yoshida%2C+H">Hisataka Yoshida</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="2010.16203v3-abstract-short" style="display: inline;"> An FPGA-based online trigger system has been developed for the COMET Phase-I experiment. This experiment searches for muon-to-electron conversion, which has never been observed yet. A drift chamber and trigger counters detect a mono-energetic electron from the conversion process in a 1-T solenoidal magnetic field. A highly intense muon source is applied to reach unprecedented experimental sensitiv… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.16203v3-abstract-full').style.display = 'inline'; document.getElementById('2010.16203v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2010.16203v3-abstract-full" style="display: none;"> An FPGA-based online trigger system has been developed for the COMET Phase-I experiment. This experiment searches for muon-to-electron conversion, which has never been observed yet. A drift chamber and trigger counters detect a mono-energetic electron from the conversion process in a 1-T solenoidal magnetic field. A highly intense muon source is applied to reach unprecedented experimental sensitivity. It also generates undesirable background particles, and a trigger rate due to these particles is expected to be much higher than an acceptable trigger rate in the data acquisition system. By using hit information from the drift chamber too, the online trigger system efficiently suppresses a background trigger rate while keeping signal-event acceptance large. A characteristic of this system is the utilization of the machine learning technique in the form of look-up tables on hardware. An initial simulation study indicates that the signal-event acceptance of the online trigger is 96% while the background trigger rate is reduced from over $90\,\mathrm{kHz}$ to $13\,\mathrm{kHz}$. For this scenario, we have produced trigger-related electronics that construct a distributed trigger architecture. The total latency of the trigger system was estimated to be $3.2\,\mathrm{渭s}$, and the first operation test was carried out by using a part of the drift-chamber readout region. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.16203v3-abstract-full').style.display = 'none'; document.getElementById('2010.16203v3-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 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2020. </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">IEEE Real Time 2020 Conference, 7 pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1812.09018">arXiv:1812.09018</a> <span> [<a href="https://arxiv.org/pdf/1812.09018">pdf</a>, <a href="https://arxiv.org/format/1812.09018">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 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/10.1093/ptep/ptz125">10.1093/ptep/ptz125 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> COMET Phase-I Technical Design Report </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=The+COMET+Collaboration"> The COMET Collaboration</a>, <a href="/search/physics?searchtype=author&query=Abramishvili%2C+R">R. Abramishvili</a>, <a href="/search/physics?searchtype=author&query=Adamov%2C+G">G. Adamov</a>, <a href="/search/physics?searchtype=author&query=Akhmetshin%2C+R+R">R. R. Akhmetshin</a>, <a href="/search/physics?searchtype=author&query=Allin%2C+A">A. Allin</a>, <a href="/search/physics?searchtype=author&query=Ang%C3%A9lique%2C+J+C">J. C. Ang茅lique</a>, <a href="/search/physics?searchtype=author&query=Anishchik%2C+V">V. Anishchik</a>, <a href="/search/physics?searchtype=author&query=Aoki%2C+M">M. Aoki</a>, <a href="/search/physics?searchtype=author&query=Aznabayev%2C+D">D. Aznabayev</a>, <a href="/search/physics?searchtype=author&query=Bagaturia%2C+I">I. Bagaturia</a>, <a href="/search/physics?searchtype=author&query=Ban%2C+G">G. Ban</a>, <a href="/search/physics?searchtype=author&query=Ban%2C+Y">Y. Ban</a>, <a href="/search/physics?searchtype=author&query=Bauer%2C+D">D. Bauer</a>, <a href="/search/physics?searchtype=author&query=Baygarashev%2C+D">D. Baygarashev</a>, <a href="/search/physics?searchtype=author&query=Bondar%2C+A+E">A. E. Bondar</a>, <a href="/search/physics?searchtype=author&query=C%C3%A2rloganu%2C+C">C. C芒rloganu</a>, <a href="/search/physics?searchtype=author&query=Carniol%2C+B">B. Carniol</a>, <a href="/search/physics?searchtype=author&query=Chau%2C+T+T">T. T. Chau</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+J+K">J. K. Chen</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+S+J">S. J. Chen</a>, <a href="/search/physics?searchtype=author&query=Cheung%2C+Y+E">Y. E. Cheung</a>, <a href="/search/physics?searchtype=author&query=da+Silva%2C+W">W. da Silva</a>, <a href="/search/physics?searchtype=author&query=Dauncey%2C+P+D">P. D. Dauncey</a>, <a href="/search/physics?searchtype=author&query=Densham%2C+C">C. Densham</a>, <a href="/search/physics?searchtype=author&query=Devidze%2C+G">G. Devidze</a> , et al. (170 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="1812.09018v3-abstract-short" style="display: inline;"> The Technical Design for the COMET Phase-I experiment is presented in this paper. COMET is an experiment at J-PARC, Japan, which will search for neutrinoless conversion of muons into electrons in the field of an aluminium nucleus ($渭-e$ conversion, $渭^- N \to e^- N$); a lepton flavor violating process. The experimental sensitivity goal for this process in the Phase-I experiment is… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.09018v3-abstract-full').style.display = 'inline'; document.getElementById('1812.09018v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.09018v3-abstract-full" style="display: none;"> The Technical Design for the COMET Phase-I experiment is presented in this paper. COMET is an experiment at J-PARC, Japan, which will search for neutrinoless conversion of muons into electrons in the field of an aluminium nucleus ($渭-e$ conversion, $渭^- N \to e^- N$); a lepton flavor violating process. The experimental sensitivity goal for this process in the Phase-I experiment is $3.1\times10^{-15}$, or 90 % upper limit of branching ratio of $7\times 10^{-15}$, which is a factor of 100 improvement over the existing limit. The expected number of background events is 0.032. To achieve the target sensitivity and background level, the 3.2 kW 8 GeV proton beam from J-PARC will be used. Two types of detectors, CyDet and StrECAL, will be used for detecting the \mue conversion events, and for measuring the beam-related background events in view of the Phase-II experiment, respectively. Results from simulation on signal and background estimations are also described. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.09018v3-abstract-full').style.display = 'none'; document.getElementById('1812.09018v3-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 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">A minor correction applied in Eq. 3</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Progress of Theoretical and Experimental Physics, Volume 2020, Issue 3, March 2020, 033C01 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1801.04688">arXiv:1801.04688</a> <span> [<a href="https://arxiv.org/pdf/1801.04688">pdf</a>, <a href="https://arxiv.org/format/1801.04688">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 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/s10052-018-5845-6">10.1140/epjc/s10052-018-5845-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The design of the MEG II experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Berg%2C+F">F. Berg</a>, <a href="/search/physics?searchtype=author&query=Biasotti%2C+M">M. Biasotti</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Chiappini%2C+M">M. Chiappini</a>, <a href="/search/physics?searchtype=author&query=Chiarello%2C+G">G. Chiarello</a>, <a href="/search/physics?searchtype=author&query=Chiri%2C+C">C. Chiri</a>, <a href="/search/physics?searchtype=author&query=Cocciolo%2C+G">G. Cocciolo</a>, <a href="/search/physics?searchtype=author&query=Corvaglia%2C+A">A. Corvaglia</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=D%27Onofrio%2C+A">A. D'Onofrio</a>, <a href="/search/physics?searchtype=author&query=Francesconi%2C+M">M. Francesconi</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Grancagnolo%2C+F">F. Grancagnolo</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Grigoriev%2C+D+N">D. N. Grigoriev</a>, <a href="/search/physics?searchtype=author&query=Hildebrandt%2C+M">M. Hildebrandt</a> , et al. (55 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="1801.04688v1-abstract-short" style="display: inline;"> The MEG experiment, designed to search for the mu+->e+ gamma decay at a 10^-13 sensitivity level, completed data taking in 2013. In order to increase the sensitivity reach of the experiment by an order of magnitude to the level of 6 x 10-14 for the branching ratio, a total upgrade, involving substantial changes to the experiment, has been undertaken, known as MEG II. We present both the motivation… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.04688v1-abstract-full').style.display = 'inline'; document.getElementById('1801.04688v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1801.04688v1-abstract-full" style="display: none;"> The MEG experiment, designed to search for the mu+->e+ gamma decay at a 10^-13 sensitivity level, completed data taking in 2013. In order to increase the sensitivity reach of the experiment by an order of magnitude to the level of 6 x 10-14 for the branching ratio, a total upgrade, involving substantial changes to the experiment, has been undertaken, known as MEG II. We present both the motivation for the upgrade and a detailed overview of the design of the experiment and of the expected detector performance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1801.04688v1-abstract-full').style.display = 'none'; document.getElementById('1801.04688v1-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 January, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">61 pages and 97 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C 78 (380) (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1612.08329">arXiv:1612.08329</a> <span> [<a href="https://arxiv.org/pdf/1612.08329">pdf</a>, <a href="https://arxiv.org/format/1612.08329">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> <p class="title is-5 mathjax"> A Fast High-Voltage Switching Multiwire Proportional Chamber </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Natori%2C+H">H. Natori</a>, <a href="/search/physics?searchtype=author&query=Teshima%2C+N">N. Teshima</a>, <a href="/search/physics?searchtype=author&query=Aoki%2C+M">M. Aoki</a>, <a href="/search/physics?searchtype=author&query=Nishiguchi%2C+H">H. Nishiguchi</a>, <a href="/search/physics?searchtype=author&query=Nguyen%2C+T+D">T. D. Nguyen</a>, <a href="/search/physics?searchtype=author&query=Takezaki%2C+Y">Y. Takezaki</a>, <a href="/search/physics?searchtype=author&query=Furuya%2C+Y">Y. Furuya</a>, <a href="/search/physics?searchtype=author&query=Ito%2C+S">S. Ito</a>, <a href="/search/physics?searchtype=author&query=Mihara%2C+S">S. Mihara</a>, <a href="/search/physics?searchtype=author&query=Nagao%2C+D">D. Nagao</a>, <a href="/search/physics?searchtype=author&query=Nakatsugawa%2C+Y">Y. Nakatsugawa</a>, <a href="/search/physics?searchtype=author&query=Nguyen%2C+T+M">T. M. Nguyen</a>, <a href="/search/physics?searchtype=author&query=Seiya%2C+Y">Y. Seiya</a>, <a href="/search/physics?searchtype=author&query=Shimizu%2C+K">K. Shimizu</a>, <a href="/search/physics?searchtype=author&query=Yamamoto%2C+K">K. Yamamoto</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="1612.08329v1-abstract-short" style="display: inline;"> A new experiment, called DeeMe, which is designed to search for $渭$-e conversions with a sensitivity of $\mathcal{O}(10^{-14})$, is in preparation at the Japan Proton Accelerator Research Complex (J-PARC). It utilizes a high-quality pulsed proton beam from the Rapid Cycling Synchrotron at J-PARC. The detector for DeeMe must tolerate large pulses of prompt charged particles whose instantaneous hit… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.08329v1-abstract-full').style.display = 'inline'; document.getElementById('1612.08329v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1612.08329v1-abstract-full" style="display: none;"> A new experiment, called DeeMe, which is designed to search for $渭$-e conversions with a sensitivity of $\mathcal{O}(10^{-14})$, is in preparation at the Japan Proton Accelerator Research Complex (J-PARC). It utilizes a high-quality pulsed proton beam from the Rapid Cycling Synchrotron at J-PARC. The detector for DeeMe must tolerate large pulses of prompt charged particles whose instantaneous hit rate is as large as 70 GHz/mm$^2$ in a time width of 200 ns and detect a single electron that arrives with delayed timing on the order of microseconds. A special wire chamber has been developed with a new dynamic gain control technique that reduces space charge effects. In this paper, we detail the novel detector scheme and operation verification. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1612.08329v1-abstract-full').style.display = 'none'; document.getElementById('1612.08329v1-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 December, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 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">To be published in PTEP</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1510.04743">arXiv:1510.04743</a> <span> [<a href="https://arxiv.org/pdf/1510.04743">pdf</a>, <a href="https://arxiv.org/ps/1510.04743">ps</a>, <a href="https://arxiv.org/format/1510.04743">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/10.1140/epjc/s10052-016-4047-3">10.1140/epjc/s10052-016-4047-3 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Muon polarization in the MEG experiment: predictions and measurements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Bao%2C+Y">Y. Bao</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Berg%2C+F">F. Berg</a>, <a href="/search/physics?searchtype=author&query=Biasotti%2C+M">M. Biasotti</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Chiarello%2C+G">G. Chiarello</a>, <a href="/search/physics?searchtype=author&query=Chiri%2C+C">C. Chiri</a>, <a href="/search/physics?searchtype=author&query=De+Bari%2C+A">A. De Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=D%C3%93nofrio%2C+A">A. D脫nofrio</a>, <a href="/search/physics?searchtype=author&query=Dussoni%2C+S">S. Dussoni</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Grancagnolo%2C+F">F. Grancagnolo</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Graziosi%2C+A">A. Graziosi</a>, <a href="/search/physics?searchtype=author&query=Grigoriev%2C+D+N">D. N. Grigoriev</a>, <a href="/search/physics?searchtype=author&query=Haruyama%2C+T">T. Haruyama</a>, <a href="/search/physics?searchtype=author&query=Hildebrandt%2C+M">M. Hildebrandt</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="1510.04743v2-abstract-short" style="display: inline;"> The MEG experiment makes use of one of the world's most intense low energy muon beams, in order to search for the lepton flavour violating process $渭^{+} \rightarrow {\rm e}^{+} 纬$. We determined the residual beam polarization at the thin stopping target, by measuring the asymmetry of the angular distribution of Michel decay positrons as a function of energy. The initial muon beam polarization at… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.04743v2-abstract-full').style.display = 'inline'; document.getElementById('1510.04743v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1510.04743v2-abstract-full" style="display: none;"> The MEG experiment makes use of one of the world's most intense low energy muon beams, in order to search for the lepton flavour violating process $渭^{+} \rightarrow {\rm e}^{+} 纬$. We determined the residual beam polarization at the thin stopping target, by measuring the asymmetry of the angular distribution of Michel decay positrons as a function of energy. The initial muon beam polarization at the production is predicted to be $P_渭 = -1$ by the Standard Model (SM) with massless neutrinos. We estimated our residual muon polarization to be $P_渭 = -0.85 \pm 0.03 ~ {\rm (stat)} ~ { }^{+ 0.04}_{-0.05} ~ {\rm (syst)}$ at the stopping target, which is consistent with the SM predictions when the depolarizing effects occurring during the muon production, propagation and moderation in the target are taken into account. The knowledge of beam polarization is of fundamental importance in order to model the background of our ${\megsign}$ search induced by the muon radiative decay: $渭^{+} \rightarrow {\rm e}^{+} \bar谓_渭谓_{\rm e} 纬$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.04743v2-abstract-full').style.display = 'none'; document.getElementById('1510.04743v2-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 April, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 October, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C (2016) 76:223 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1312.3217">arXiv:1312.3217</a> <span> [<a href="https://arxiv.org/pdf/1312.3217">pdf</a>, <a href="https://arxiv.org/format/1312.3217">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> <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/10.1140/epjc/s10052-016-3947-6">10.1140/epjc/s10052-016-3947-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the radiative decay of polarized muons in the MEG experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=MEG+Collaboration"> MEG Collaboration</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Bao%2C+Y">Y. Bao</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Berg%2C+F">F. Berg</a>, <a href="/search/physics?searchtype=author&query=Biasotti%2C+M">M. Biasotti</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Chiarello%2C+G">G. Chiarello</a>, <a href="/search/physics?searchtype=author&query=Chiri%2C+C">C. Chiri</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=D%27Onofrio%2C+A">A. D'Onofrio</a>, <a href="/search/physics?searchtype=author&query=Dussoni%2C+S">S. Dussoni</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Grancagnolo%2C+F">F. Grancagnolo</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Graziosi%2C+A">A. Graziosi</a>, <a href="/search/physics?searchtype=author&query=Grigoriev%2C+D+N">D. N. Grigoriev</a>, <a href="/search/physics?searchtype=author&query=Haruyama%2C+T">T. Haruyama</a> , et al. (46 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="1312.3217v3-abstract-short" style="display: inline;"> We studied the radiative muon decay $渭^+ \to e^+谓\bar谓纬$ by using for the first time an almost fully polarized muon source. We identified a large sample (~13000) of these decays in a total sample of 1.8x10^14 positive muon decays collected in the MEG experiment in the years 2009--2010 and measured the branching ratio B($渭^+ \to e^+谓\bar谓纬$) = (6.03+-0.14(stat.)+-0.53(sys.))x10^-8 for E_e > 45 MeV… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.3217v3-abstract-full').style.display = 'inline'; document.getElementById('1312.3217v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1312.3217v3-abstract-full" style="display: none;"> We studied the radiative muon decay $渭^+ \to e^+谓\bar谓纬$ by using for the first time an almost fully polarized muon source. We identified a large sample (~13000) of these decays in a total sample of 1.8x10^14 positive muon decays collected in the MEG experiment in the years 2009--2010 and measured the branching ratio B($渭^+ \to e^+谓\bar谓纬$) = (6.03+-0.14(stat.)+-0.53(sys.))x10^-8 for E_e > 45 MeV and E_纬 > 40 MeV, consistent with the Standard Model prediction. The precise measurement of this decay mode provides a basic tool for the timing calibration, a normalization channel, and a strong quality check of the complete MEG experiment in the search for $渭^+ \to e^+纬$ process. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1312.3217v3-abstract-full').style.display = 'none'; document.getElementById('1312.3217v3-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 March, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 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">8 pages, 7 figures. Added an introduction to NLO calculation which was recently calculated. Published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C (2016) 76:108 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1303.2348">arXiv:1303.2348</a> <span> [<a href="https://arxiv.org/pdf/1303.2348">pdf</a>, <a href="https://arxiv.org/ps/1303.2348">ps</a>, <a href="https://arxiv.org/format/1303.2348">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 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/s10052-013-2365-2">10.1140/epjc/s10052-013-2365-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The MEG detector for $渭+\to e+纬$ decay search </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adam%2C+J">J. Adam</a>, <a href="/search/physics?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Cerri%2C+C">C. Cerri</a>, <a href="/search/physics?searchtype=author&query=Corbo%2C+M">M. Corbo</a>, <a href="/search/physics?searchtype=author&query=Curalli%2C+N">N. Curalli</a>, <a href="/search/physics?searchtype=author&query=De+Bari%2C+A">A. De Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Del+Frate%2C+L">L. Del Frate</a>, <a href="/search/physics?searchtype=author&query=Doke%2C+S">S. Doke</a>, <a href="/search/physics?searchtype=author&query=Dussoni%2C+S">S. Dussoni</a>, <a href="/search/physics?searchtype=author&query=Egger%2C+J">J. Egger</a>, <a href="/search/physics?searchtype=author&query=Fratini%2C+K">K. Fratini</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Galeotti%2C+S">S. Galeotti</a>, <a href="/search/physics?searchtype=author&query=Gallucci%2C+G">G. Gallucci</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Golden%2C+B">B. Golden</a> , et al. (51 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="1303.2348v4-abstract-short" style="display: inline;"> The MEG (Mu to Electron Gamma) experiment has been running at the Paul Scherrer Institut (PSI), Switzerland since 2008 to search for the decay \meg\ by using one of the most intense continuous $渭^+$ beams in the world. This paper presents the MEG components: the positron spectrometer, including a thin target, a superconducting magnet, a set of drift chambers for measuring the muon decay vertex and… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.2348v4-abstract-full').style.display = 'inline'; document.getElementById('1303.2348v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1303.2348v4-abstract-full" style="display: none;"> The MEG (Mu to Electron Gamma) experiment has been running at the Paul Scherrer Institut (PSI), Switzerland since 2008 to search for the decay \meg\ by using one of the most intense continuous $渭^+$ beams in the world. This paper presents the MEG components: the positron spectrometer, including a thin target, a superconducting magnet, a set of drift chambers for measuring the muon decay vertex and the positron momentum, a timing counter for measuring the positron time, and a liquid xenon detector for measuring the photon energy, position and time. The trigger system, the read-out electronics and the data acquisition system are also presented in detail. The paper is completed with a description of the equipment and techniques developed for the calibration in time and energy and the simulation of the whole apparatus. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.2348v4-abstract-full').style.display = 'none'; document.getElementById('1303.2348v4-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, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 March, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">59 pages, 90 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur. Phys. J. C, 73 (2013) 2365 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1303.0754">arXiv:1303.0754</a> <span> [<a href="https://arxiv.org/pdf/1303.0754">pdf</a>, <a href="https://arxiv.org/ps/1303.0754">ps</a>, <a href="https://arxiv.org/format/1303.0754">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"> New constraint on the existence of the mu+-> e+ gamma decay </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=MEG+Collaboration"> MEG Collaboration</a>, <a href="/search/physics?searchtype=author&query=Adam%2C+J">J. Adam</a>, <a href="/search/physics?searchtype=author&query=Bai%2C+X">X. Bai</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Cerri%2C+C">C. Cerri</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Doke%2C+T">T. Doke</a>, <a href="/search/physics?searchtype=author&query=Dussoni%2C+S">S. Dussoni</a>, <a href="/search/physics?searchtype=author&query=Egger%2C+J">J. Egger</a>, <a href="/search/physics?searchtype=author&query=Fratini%2C+K">K. Fratini</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Gallucci%2C+G">G. Gallucci</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Golden%2C+B">B. Golden</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Graziosi%2C+A">A. Graziosi</a>, <a href="/search/physics?searchtype=author&query=Grigoriev%2C+D+N">D. N. Grigoriev</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="1303.0754v2-abstract-short" style="display: inline;"> The analysis of a combined data set, totaling 3.6 \times 10^14 stopped muons on target, in the search for the lepton flavour violating decay mu^+ -> e^+ gamma is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of 5.7 \times 10^-13 (90% conf… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.0754v2-abstract-full').style.display = 'inline'; document.getElementById('1303.0754v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1303.0754v2-abstract-full" style="display: none;"> The analysis of a combined data set, totaling 3.6 \times 10^14 stopped muons on target, in the search for the lepton flavour violating decay mu^+ -> e^+ gamma is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of 5.7 \times 10^-13 (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1303.0754v2-abstract-full').style.display = 'none'; document.getElementById('1303.0754v2-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 April, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 March, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 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">5 pages, 3 figures, a version accepted in Phys. Rev. Lett</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1301.7225">arXiv:1301.7225</a> <span> [<a href="https://arxiv.org/pdf/1301.7225">pdf</a>, <a href="https://arxiv.org/format/1301.7225">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="High Energy Physics - Phenomenology">hep-ph</span> </div> </div> <p class="title is-5 mathjax"> MEG Upgrade Proposal </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Cerri%2C+C">C. Cerri</a>, <a href="/search/physics?searchtype=author&query=Dussoni%2C+S">S. Dussoni</a>, <a href="/search/physics?searchtype=author&query=Galli%2C+L">L. Galli</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Nicol%C3%B2%2C+D">D. Nicol貌</a>, <a href="/search/physics?searchtype=author&query=Raffaelli%2C+F">F. Raffaelli</a>, <a href="/search/physics?searchtype=author&query=Sergiampietri%2C+F">F. Sergiampietri</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a>, <a href="/search/physics?searchtype=author&query=Tenchini%2C+F">F. Tenchini</a>, <a href="/search/physics?searchtype=author&query=Bagliani%2C+D">D. Bagliani</a>, <a href="/search/physics?searchtype=author&query=De+Gerone%2C+M">M. De Gerone</a>, <a href="/search/physics?searchtype=author&query=Gatti%2C+F">F. Gatti</a>, <a href="/search/physics?searchtype=author&query=Baracchini%2C+E">E. Baracchini</a>, <a href="/search/physics?searchtype=author&query=Fujii%2C+Y">Y. Fujii</a>, <a href="/search/physics?searchtype=author&query=Iwamoto%2C+T">T. Iwamoto</a>, <a href="/search/physics?searchtype=author&query=Kaneko%2C+D">D. Kaneko</a>, <a href="/search/physics?searchtype=author&query=Mori%2C+T">T. Mori</a>, <a href="/search/physics?searchtype=author&query=Nishimura%2C+M">M. Nishimura</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Sawada%2C+R">R. Sawada</a>, <a href="/search/physics?searchtype=author&query=Uchiyama%2C+Y">Y. Uchiyama</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</a>, <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">P. W. Cattaneo</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="1301.7225v2-abstract-short" style="display: inline;"> We propose the continuation of the MEG experiment to search for the charged lepton flavour violating decay (cLFV) 渭\to e 纬, based on an upgrade of the experiment, which aims for a sensitivity enhancement of one order of magnitude compared to the final MEG result, down to the $6 \times 10^{-14}$ level. The key features of this new MEG upgrade are an increased rate capability of all detectors to ena… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.7225v2-abstract-full').style.display = 'inline'; document.getElementById('1301.7225v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1301.7225v2-abstract-full" style="display: none;"> We propose the continuation of the MEG experiment to search for the charged lepton flavour violating decay (cLFV) 渭\to e 纬, based on an upgrade of the experiment, which aims for a sensitivity enhancement of one order of magnitude compared to the final MEG result, down to the $6 \times 10^{-14}$ level. The key features of this new MEG upgrade are an increased rate capability of all detectors to enable running at the intensity frontier and improved energy, angular and timing resolutions, for both the positron and photon arms of the detector. On the positron-side a new low-mass, single volume, high granularity tracker is envisaged, in combination with a new highly segmented, fast timing counter array, to track positron from a thinner stopping target. The photon-arm, with the largest liquid xenon (LXe) detector in the world, totalling 900 l, will also be improved by increasing the granularity at the incident face, by replacing the current photomultiplier tubes (PMTs) with a larger number of smaller photosensors and optimizing the photosensor layout also on the lateral faces. A new DAQ scheme involving the implementation of a new combined readout board capable of integrating the diverse functions of digitization, trigger capability and splitter functionality into one condensed unit, is also under development. We describe here the status of the MEG experiment, the scientific merits of the upgrade and the experimental methods we plan to use. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1301.7225v2-abstract-full').style.display = 'none'; document.getElementById('1301.7225v2-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 February, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 January, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">A. M. Baldini and T. Mori Spokespersons. Research proposal submitted to the Paul Scherrer Institute Research Committee for Particle Physics at the Ring Cyclotron. 131 Pages</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1205.3874">arXiv:1205.3874</a> <span> [<a href="https://arxiv.org/pdf/1205.3874">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</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"> Improvement of xenon purification system using a combination of a pulse tube refrigerator and a coaxial heat exchanger </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Chen%2C+W">Wan-Ting Chen</a>, <a href="/search/physics?searchtype=author&query=Chbib%2C+D">D. Chbib</a>, <a href="/search/physics?searchtype=author&query=Cussonneau%2C+J+-">J. -P. Cussonneau</a>, <a href="/search/physics?searchtype=author&query=Donnard%2C+J">J. Donnard</a>, <a href="/search/physics?searchtype=author&query=Duval%2C+S">S. Duval</a>, <a href="/search/physics?searchtype=author&query=Lemaire%2C+O">O. Lemaire</a>, <a href="/search/physics?searchtype=author&query=Calloch%2C+M+L">M. Le Calloch</a>, <a href="/search/physics?searchtype=author&query=Ray%2C+P+L">P. Le Ray</a>, <a href="/search/physics?searchtype=author&query=Mohamad-Hadi%2C+A+-">A. -F. Mohamad-Hadi</a>, <a href="/search/physics?searchtype=author&query=Morteau%2C+E">E. Morteau</a>, <a href="/search/physics?searchtype=author&query=Oger%2C+T">T. Oger</a>, <a href="/search/physics?searchtype=author&query=Scotto-Lavina%2C+L">L. Scotto-Lavina</a>, <a href="/search/physics?searchtype=author&query=Stutzmann%2C+J+-">J. -S. Stutzmann</a>, <a href="/search/physics?searchtype=author&query=Thers%2C+D">D. Thers</a>, <a href="/search/physics?searchtype=author&query=Briend%2C+P">P. Briend</a>, <a href="/search/physics?searchtype=author&query=Haruyama%2C+T">T. Haruyama</a>, <a href="/search/physics?searchtype=author&query=Mihara%2C+S">S. Mihara</a>, <a href="/search/physics?searchtype=author&query=Tauchi%2C+T">T. Tauchi</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="1205.3874v1-abstract-short" style="display: inline;"> We have developed a compact cryogenic system with a pulse tube refrigerator and a coaxial heat exchanger. This liquefaction-purification system not only saves the cooling power used to reach high gaseous recirculation rate, but also reduces the impurity level with high speed. The heat exchanger operates with an efficiency of 99%, which indicates the possibility for fast xenon gas recirculation in… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.3874v1-abstract-full').style.display = 'inline'; document.getElementById('1205.3874v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1205.3874v1-abstract-full" style="display: none;"> We have developed a compact cryogenic system with a pulse tube refrigerator and a coaxial heat exchanger. This liquefaction-purification system not only saves the cooling power used to reach high gaseous recirculation rate, but also reduces the impurity level with high speed. The heat exchanger operates with an efficiency of 99%, which indicates the possibility for fast xenon gas recirculation in a highpressurized large-scale xenon storage with much less thermal losses. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1205.3874v1-abstract-full').style.display = 'none'; document.getElementById('1205.3874v1-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> 17 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">Journal ref:</span> Proceeding of ICEC24-ICMC2012 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0407033">arXiv:physics/0407033</a> <span> [<a href="https://arxiv.org/pdf/physics/0407033">pdf</a>, <a href="https://arxiv.org/ps/physics/0407033">ps</a>, <a href="https://arxiv.org/format/physics/0407033">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 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.nima.2005.02.029">10.1016/j.nima.2005.02.029 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Absorption of Scintillation Light in a 100 $\ell$ Liquid Xenon$纬$ Ray Detector and Expected Detector Performance </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baldini%2C+A">A. Baldini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Doke%2C+T">T. Doke</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Grebenuk%2C+A+A">A. A. Grebenuk</a>, <a href="/search/physics?searchtype=author&query=Grigoriev%2C+D+N">D. N. Grigoriev</a>, <a href="/search/physics?searchtype=author&query=Haruyama%2C+T">T. Haruyama</a>, <a href="/search/physics?searchtype=author&query=Kasami%2C+K">K. Kasami</a>, <a href="/search/physics?searchtype=author&query=Kikuchi%2C+J">J. Kikuchi</a>, <a href="/search/physics?searchtype=author&query=Maki%2C+A">A. Maki</a>, <a href="/search/physics?searchtype=author&query=Mashimo%2C+T">T. Mashimo</a>, <a href="/search/physics?searchtype=author&query=Mihara%2C+S">S. Mihara</a>, <a href="/search/physics?searchtype=author&query=Mitsuhashi%2C+T">T. Mitsuhashi</a>, <a href="/search/physics?searchtype=author&query=Mori%2C+T">T. Mori</a>, <a href="/search/physics?searchtype=author&query=Nicolo%60%2C+D">D. Nicolo`</a>, <a href="/search/physics?searchtype=author&query=Nishiguchi%2C+H">H. Nishiguchi</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Ozone%2C+K">K. Ozone</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/physics?searchtype=author&query=Pazzi%2C+R">R. Pazzi</a>, <a href="/search/physics?searchtype=author&query=Ritt%2C+S">S. Ritt</a>, <a href="/search/physics?searchtype=author&query=Sawada%2C+R">R. Sawada</a>, <a href="/search/physics?searchtype=author&query=Sergiampietri%2C+F">F. Sergiampietri</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a> , et al. (6 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="physics/0407033v1-abstract-short" style="display: inline;"> An 800L liquid xenon scintillation $纬$ ray detector is being developed for the MEG experiment which will search for $渭^+\to\mathrm{e}^+纬$ decay at the Paul Scherrer Institut. Absorption of scintillation light of xenon by impurities might possibly limit the performance of such a detector. We used a 100L prototype with an active volume of 372x372x496 mm$^3$ to study the scintillation light absorpt… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0407033v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0407033v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0407033v1-abstract-full" style="display: none;"> An 800L liquid xenon scintillation $纬$ ray detector is being developed for the MEG experiment which will search for $渭^+\to\mathrm{e}^+纬$ decay at the Paul Scherrer Institut. Absorption of scintillation light of xenon by impurities might possibly limit the performance of such a detector. We used a 100L prototype with an active volume of 372x372x496 mm$^3$ to study the scintillation light absorption. We have developed a method to evaluate the light absorption, separately from elastic scattering of light, by measuring cosmic rays and $伪$ sources. By using a suitable purification technique, an absorption length longer than 100 cm has been achieved. The effects of the light absorption on the energy resolution are estimated by Monte Carlo simulation. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0407033v1-abstract-full').style.display = 'none'; document.getElementById('physics/0407033v1-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 July, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">18 pages, 10 figures (eps). Submitted to Nucl. Instr. and Meth. A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> UT-ICEPP 04-02 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Instrum.Meth. A545 (2005) 753-764 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0401072">arXiv:physics/0401072</a> <span> [<a href="https://arxiv.org/pdf/physics/0401072">pdf</a>, <a href="https://arxiv.org/ps/physics/0401072">ps</a>, <a href="https://arxiv.org/format/physics/0401072">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 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/10.1109/TDEI.2006.1657967">10.1109/TDEI.2006.1657967 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Liquid Xe scintillation calorimetry and Xe optical properties </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Baldini%2C+A">A. Baldini</a>, <a href="/search/physics?searchtype=author&query=Bemporad%2C+C">C. Bemporad</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Doke%2C+T">T. Doke</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Haruyama%2C+T">T. Haruyama</a>, <a href="/search/physics?searchtype=author&query=Mihara%2C+S">S. Mihara</a>, <a href="/search/physics?searchtype=author&query=Mori%2C+T">T. Mori</a>, <a href="/search/physics?searchtype=author&query=Nicol%C3%B2%2C+D">D. Nicol貌</a>, <a href="/search/physics?searchtype=author&query=Nishiguchi%2C+H">H. Nishiguchi</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">W. Ootani</a>, <a href="/search/physics?searchtype=author&query=Ozone%2C+K">K. Ozone</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/physics?searchtype=author&query=Pazzi%2C+R">R. Pazzi</a>, <a href="/search/physics?searchtype=author&query=Sawada%2C+R">R. Sawada</a>, <a href="/search/physics?searchtype=author&query=Sergiampietri%2C+F">F. Sergiampietri</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a>, <a href="/search/physics?searchtype=author&query=Suzuki%2C+S">S. Suzuki</a>, <a href="/search/physics?searchtype=author&query=Terasawa%2C+K">K. Terasawa</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="physics/0401072v1-abstract-short" style="display: inline;"> The optical properties of LXe in the vacuum ultra violet (VUV), determining the performance of a scintillation calorimeter, are discussed in detail. The available data, measured in a wider spectral region from visible to UV light, and in a large range of Xe densities, from gas to liquid, are examined. It is shown that this information can be used for deriving the LXe optical properties in the VU… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0401072v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0401072v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0401072v1-abstract-full" style="display: none;"> The optical properties of LXe in the vacuum ultra violet (VUV), determining the performance of a scintillation calorimeter, are discussed in detail. The available data, measured in a wider spectral region from visible to UV light, and in a large range of Xe densities, from gas to liquid, are examined. It is shown that this information can be used for deriving the LXe optical properties in the VUV. A comparison is made with the few direct measurements in LXe for VUV light resulting from the LXe excitation by ionizing particles. A useful relation is obtained which connects the Rayleigh scattering length to the refractive index in LXe. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0401072v1-abstract-full').style.display = 'none'; document.getElementById('physics/0401072v1-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 January, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 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">20 pages, 12 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> IEEE Trans.Dielectr.Electr.Insul. 13 (2006) 547-555 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" 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