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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.19417">arXiv:2407.19417</a> <span> [<a href="https://arxiv.org/pdf/2407.19417">pdf</a>, <a href="https://arxiv.org/format/2407.19417">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"> Photon energy reconstruction with the MEG II liquid xenon calorimeter </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Yamamoto%2C+K">Kensuke Yamamoto</a>, <a href="/search/physics?searchtype=author&query=Ban%2C+S">Sei Ban</a>, <a href="/search/physics?searchtype=author&query=Gerritzen%2C+L">Lukas Gerritzen</a>, <a href="/search/physics?searchtype=author&query=Iwamoto%2C+T">Toshiyuki Iwamoto</a>, <a href="/search/physics?searchtype=author&query=Kobayashi%2C+S">Satoru Kobayashi</a>, <a href="/search/physics?searchtype=author&query=Matsushita%2C+A">Ayaka Matsushita</a>, <a href="/search/physics?searchtype=author&query=Mori%2C+T">Toshinori Mori</a>, <a href="/search/physics?searchtype=author&query=Onda%2C+R">Rina Onda</a>, <a href="/search/physics?searchtype=author&query=Ootani%2C+W">Wataru Ootani</a>, <a href="/search/physics?searchtype=author&query=Oya%2C+A">Atsushi Oya</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="2407.19417v2-abstract-short" style="display: inline;"> The MEG II experiment searches for a charged-lepton-flavour-violating $渭\to e 纬$ with the target sensitivity of $6 \times 10^{-14}$. A liquid xenon calorimeter with VUV-sensitive photosensors measures photon position, timing, and energy. This paper concentrates on the precise photon energy reconstruction with the MEG II liquid xenon calorimeter. Since a muon beam rate is… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.19417v2-abstract-full').style.display = 'inline'; document.getElementById('2407.19417v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.19417v2-abstract-full" style="display: none;"> The MEG II experiment searches for a charged-lepton-flavour-violating $渭\to e 纬$ with the target sensitivity of $6 \times 10^{-14}$. A liquid xenon calorimeter with VUV-sensitive photosensors measures photon position, timing, and energy. This paper concentrates on the precise photon energy reconstruction with the MEG II liquid xenon calorimeter. Since a muon beam rate is $3\text{-}5 \times 10^{7}~\text{s}^{-1}$, multi-photon elimination analysis is performed using waveform analysis techniques such as a template waveform fit. As a result, background events in the energy range of 48-58 MeV were reduced by 34 %. The calibration of the energy scale of the calorimeter with several calibration sources is also discussed to achieve a high resolution of 1.8 %. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.19417v2-abstract-full').style.display = 'none'; document.getElementById('2407.19417v2-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 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 7 figures. Contribution to 20th International Conference on Calorimetry for Particle Physics (CALOR2024). Submitted to EPJ Web of Conferences</span> </p> </li> <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/2208.09906">arXiv:2208.09906</a> <span> [<a href="https://arxiv.org/pdf/2208.09906">pdf</a>, <a href="https://arxiv.org/format/2208.09906">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 the Scintillating Fiber Timing Detector for the Mu3e Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bravar%2C+A">A. Bravar</a>, <a href="/search/physics?searchtype=author&query=Buonaura%2C+A">A. Buonaura</a>, <a href="/search/physics?searchtype=author&query=Corrodi%2C+S">S. Corrodi</a>, <a href="/search/physics?searchtype=author&query=Damyanova%2C+A">A. Damyanova</a>, <a href="/search/physics?searchtype=author&query=Demets%2C+Y">Y. Demets</a>, <a href="/search/physics?searchtype=author&query=Gerritzen%2C+L">L. Gerritzen</a>, <a href="/search/physics?searchtype=author&query=Grab%2C+C">Ch. Grab</a>, <a href="/search/physics?searchtype=author&query=Perez%2C+C+M">C. Martin Perez</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</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="2208.09906v1-abstract-short" style="display: inline;"> We present and discuss the development and performance of a compact scintillating fiber (SciFi) detector for timing to be used in the Mu3e experiment at very high particle rates. The SciFi detector is read out with multichannel silicon photomuiltipliers (SiPM) arrays at both ends to achieve the best timing performance. Mu3e is a new experiment under preparation at the Paul Scherrer Institute to se… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.09906v1-abstract-full').style.display = 'inline'; document.getElementById('2208.09906v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2208.09906v1-abstract-full" style="display: none;"> We present and discuss the development and performance of a compact scintillating fiber (SciFi) detector for timing to be used in the Mu3e experiment at very high particle rates. The SciFi detector is read out with multichannel silicon photomuiltipliers (SiPM) arrays at both ends to achieve the best timing performance. Mu3e is a new experiment under preparation at the Paul Scherrer Institute to search for charged Lepton Flavor Violation in the rare neutrinoless muon decay mu->eee using the most intense continuous surface muon beam in the world. The Mu3e detector is based on thin high-voltage monolithic active silicon pixel sensors (HV-MAPS) for very precise tracking in conjunction with scintillating fibers and scintillating tiles coupled to SiPMs for accurate timing measurements and it is designed to operate at very high intensities. In order to reach a single event sensitivity of 10^-16 for this rare mu->eee muon decay, all backgrounds must be rejected well below this level. To suppress all forms of accidental background, a very thin SciFi detector (thickness < 0.2% of a radiation length X_0) with a time resolution of 250 ps, efficiency in excess of 96%, and spatial resolution of 100 micron has been developed. In this paper we report on the development, construction, and performance of this SciFi detector. Different scintillating fiber types have been evaluated and various assembly procedures have been tested to achieve the best performance. The compact size, fast response, good timing, high spatial resolution, insensitivity to magnetic fields, and adaptable geometry make SciFi detectors suitable for a variety of applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2208.09906v1-abstract-full').style.display = 'none'; document.getElementById('2208.09906v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 August, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">To be submitted to Jurnal of Instrumentation</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2010.15648">arXiv:2010.15648</a> <span> [<a href="https://arxiv.org/pdf/2010.15648">pdf</a>, <a href="https://arxiv.org/format/2010.15648">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.2021.3084060">10.1109/TNS.2021.3084060 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Mu3e Data Acquisition </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Augustin%2C+H">Heiko Augustin</a>, <a href="/search/physics?searchtype=author&query=Berger%2C+N">Niklaus Berger</a>, <a href="/search/physics?searchtype=author&query=Bravar%2C+A">Alessandro Bravar</a>, <a href="/search/physics?searchtype=author&query=Briggl%2C+K">Konrad Briggl</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+H">Huangshan Chen</a>, <a href="/search/physics?searchtype=author&query=Corrodi%2C+S">Simon Corrodi</a>, <a href="/search/physics?searchtype=author&query=Dittmeier%2C+S">Sebastian Dittmeier</a>, <a href="/search/physics?searchtype=author&query=Gayther%2C+B">Ben Gayther</a>, <a href="/search/physics?searchtype=author&query=Gerritzen%2C+L">Lukas Gerritzen</a>, <a href="/search/physics?searchtype=author&query=Gottschalk%2C+D">Dirk Gottschalk</a>, <a href="/search/physics?searchtype=author&query=Hartmann%2C+U">Ueli Hartmann</a>, <a href="/search/physics?searchtype=author&query=Hesketh%2C+G">Gavin Hesketh</a>, <a href="/search/physics?searchtype=author&query=K%C3%B6ppel%2C+M">Marius K枚ppel</a>, <a href="/search/physics?searchtype=author&query=Kilani%2C+S">Samer Kilani</a>, <a href="/search/physics?searchtype=author&query=Kozlinskiy%2C+A">Alexandr Kozlinskiy</a>, <a href="/search/physics?searchtype=author&query=Aeschbacher%2C+F+M">Frank Meier Aeschbacher</a>, <a href="/search/physics?searchtype=author&query=M%C3%BCller%2C+M">Martin M眉ller</a>, <a href="/search/physics?searchtype=author&query=Munwes%2C+Y">Yonathan Munwes</a>, <a href="/search/physics?searchtype=author&query=Perrevoort%2C+A">Ann-Kathrin Perrevoort</a>, <a href="/search/physics?searchtype=author&query=Ritt%2C+S">Stefan Ritt</a>, <a href="/search/physics?searchtype=author&query=Sch%C3%B6ning%2C+A">Andr茅 Sch枚ning</a>, <a href="/search/physics?searchtype=author&query=Schultz-Coulon%2C+H">Hans-Christian Schultz-Coulon</a>, <a href="/search/physics?searchtype=author&query=Shen%2C+W">Wei Shen</a>, <a href="/search/physics?searchtype=author&query=Vigani%2C+L">Luigi Vigani</a>, <a href="/search/physics?searchtype=author&query=Bruch%2C+D+v">Dorothea vom Bruch</a> , et al. (3 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="2010.15648v2-abstract-short" style="display: inline;"> The Mu3e experiment aims to find or exclude the lepton flavour violating decay $渭^+\to e^+e^-e^+$ with a sensitivity of one in 10$^{16}$ muon decays. The first phase of the experiment is currently under construction at the Paul Scherrer Institute (PSI, Switzerland), where beams with up to 10$^8$ muons per second are available. The detector will consist of an ultra-thin pixel tracker made from High… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.15648v2-abstract-full').style.display = 'inline'; document.getElementById('2010.15648v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2010.15648v2-abstract-full" style="display: none;"> The Mu3e experiment aims to find or exclude the lepton flavour violating decay $渭^+\to e^+e^-e^+$ with a sensitivity of one in 10$^{16}$ muon decays. The first phase of the experiment is currently under construction at the Paul Scherrer Institute (PSI, Switzerland), where beams with up to 10$^8$ muons per second are available. The detector will consist of an ultra-thin pixel tracker made from High-Voltage Monolithic Active Pixel Sensors (HV-MAPS), complemented by scintillating tiles and fibres for precise timing measurements. The experiment produces about 100 Gbit/s of zero-suppressed data which are transported to a filter farm using a network of FPGAs and fast optical links. On the filter farm, tracks and three-particle vertices are reconstructed using highly parallel algorithms running on graphics processing units, leading to a reduction of the data to 100 Mbyte/s for mass storage and offline analysis. The paper introduces the system design and hardware implementation of the Mu3e data acquisition and filter farm. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.15648v2-abstract-full').style.display = 'none'; document.getElementById('2010.15648v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 January, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 29 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">8 pages, 9 figures Submitted to IEEE TNS</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> IEEE Transactions on Nuclear Science, vol. 68, no. 8, pp. 1833-1840, Aug. 2021 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2009.11690">arXiv:2009.11690</a> <span> [<a href="https://arxiv.org/pdf/2009.11690">pdf</a>, <a href="https://arxiv.org/format/2009.11690">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.2021.165679">10.1016/j.nima.2021.165679 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Technical design of the phase I Mu3e experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Arndt%2C+K">K. Arndt</a>, <a href="/search/physics?searchtype=author&query=Augustin%2C+H">H. Augustin</a>, <a href="/search/physics?searchtype=author&query=Baesso%2C+P">P. Baesso</a>, <a href="/search/physics?searchtype=author&query=Berger%2C+N">N. Berger</a>, <a href="/search/physics?searchtype=author&query=Berg%2C+F">F. Berg</a>, <a href="/search/physics?searchtype=author&query=Betancourt%2C+C">C. Betancourt</a>, <a href="/search/physics?searchtype=author&query=Bortoletto%2C+D">D. Bortoletto</a>, <a href="/search/physics?searchtype=author&query=Bravar%2C+A">A. Bravar</a>, <a href="/search/physics?searchtype=author&query=Briggl%2C+K">K. Briggl</a>, <a href="/search/physics?searchtype=author&query=Bruch%2C+D+v">D. vom Bruch</a>, <a href="/search/physics?searchtype=author&query=Buonaura%2C+A">A. Buonaura</a>, <a href="/search/physics?searchtype=author&query=Cadoux%2C+F">F. Cadoux</a>, <a href="/search/physics?searchtype=author&query=Barajas%2C+C+C">C. Chavez Barajas</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+H">H. Chen</a>, <a href="/search/physics?searchtype=author&query=Clark%2C+K">K. Clark</a>, <a href="/search/physics?searchtype=author&query=Cooke%2C+P">P. Cooke</a>, <a href="/search/physics?searchtype=author&query=Corrodi%2C+S">S. Corrodi</a>, <a href="/search/physics?searchtype=author&query=Damyanova%2C+A">A. Damyanova</a>, <a href="/search/physics?searchtype=author&query=Demets%2C+Y">Y. Demets</a>, <a href="/search/physics?searchtype=author&query=Dittmeier%2C+S">S. Dittmeier</a>, <a href="/search/physics?searchtype=author&query=Eckert%2C+P">P. Eckert</a>, <a href="/search/physics?searchtype=author&query=Ehrler%2C+F">F. Ehrler</a>, <a href="/search/physics?searchtype=author&query=Fahrni%2C+D">D. Fahrni</a>, <a href="/search/physics?searchtype=author&query=Gagneur%2C+S">S. Gagneur</a>, <a href="/search/physics?searchtype=author&query=Gerritzen%2C+L">L. Gerritzen</a> , et al. (80 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="2009.11690v3-abstract-short" style="display: inline;"> The Mu3e experiment aims to find or exclude the lepton flavour violating decay $渭\rightarrow eee$ at branching fractions above $10^{-16}$. A first phase of the experiment using an existing beamline at the Paul Scherrer Institute (PSI) is designed to reach a single event sensitivity of $2\cdot 10^{-15}$. We present an overview of all aspects of the technical design and expected performance of the p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.11690v3-abstract-full').style.display = 'inline'; document.getElementById('2009.11690v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2009.11690v3-abstract-full" style="display: none;"> The Mu3e experiment aims to find or exclude the lepton flavour violating decay $渭\rightarrow eee$ at branching fractions above $10^{-16}$. A first phase of the experiment using an existing beamline at the Paul Scherrer Institute (PSI) is designed to reach a single event sensitivity of $2\cdot 10^{-15}$. We present an overview of all aspects of the technical design and expected performance of the phase~I Mu3e detector. The high rate of up to $10^{8}$ muon decays per second and the low momenta of the decay electrons and positrons pose a unique set of challenges, which we tackle using an ultra thin tracking detector based on high-voltage monolithic active pixel sensors combined with scintillating fibres and tiles for precise timing measurements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2009.11690v3-abstract-full').style.display = 'none'; document.getElementById('2009.11690v3-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 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 24 September, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 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">117 pages. Minor corrections to the author list. Replaced with published version. Editor: Frank Meier Aeschbacher</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Instruments and Methods in Physics Research Section A: Vol. 1014 (2021) 165679 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path 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