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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/2310.12865">arXiv:2310.12865</a> <span> [<a href="https://arxiv.org/pdf/2310.12865">pdf</a>, <a href="https://arxiv.org/format/2310.12865">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"> Performances of a new generation tracking detector: the MEG II cylindrical drfit chamber </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=Benmansour%2C+H">H. Benmansour</a>, <a href="/search/physics?searchtype=author&query=Boca%2C+G">G. Boca</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=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=Grancagnolo%2C+F">F. Grancagnolo</a>, <a href="/search/physics?searchtype=author&query=Grandoni%2C+E+G">E. G. Grandoni</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">M. Grassi</a>, <a href="/search/physics?searchtype=author&query=Hildebrandt%2C+M">M. Hildebrandt</a>, <a href="/search/physics?searchtype=author&query=Ignatov%2C+F">F. Ignatov</a>, <a href="/search/physics?searchtype=author&query=Meucci%2C+M">M. Meucci</a>, <a href="/search/physics?searchtype=author&query=Molzon%2C+W">W. Molzon</a>, <a href="/search/physics?searchtype=author&query=Nicolo%27%2C+D">D. Nicolo'</a>, <a href="/search/physics?searchtype=author&query=Oya%2C+A">A. Oya</a>, <a href="/search/physics?searchtype=author&query=Palo%2C+D">D. Palo</a>, <a href="/search/physics?searchtype=author&query=Panareo%2C+M">M. Panareo</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/physics?searchtype=author&query=Raffaelli%2C+F">F. Raffaelli</a>, <a href="/search/physics?searchtype=author&query=Renga%2C+F">F. Renga</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="2310.12865v2-abstract-short" style="display: inline;"> The cylindrical drift chamber is the most innovative part of the MEG~II detector, the upgraded version of the MEG experiment. The MEG~II chamber differs from the MEG one because it is a single volume cylindrical structure, instead of a segmented one, chosen to improve its resolutions and efficiency in detecting low energy positrons from muon decays at rest. In this paper, we show the characteristi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.12865v2-abstract-full').style.display = 'inline'; document.getElementById('2310.12865v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2310.12865v2-abstract-full" style="display: none;"> The cylindrical drift chamber is the most innovative part of the MEG~II detector, the upgraded version of the MEG experiment. The MEG~II chamber differs from the MEG one because it is a single volume cylindrical structure, instead of a segmented one, chosen to improve its resolutions and efficiency in detecting low energy positrons from muon decays at rest. In this paper, we show the characteristics and performances of this fundamental part of the MEG~II apparatus and we discuss the impact of its higher resolution and efficiency on the sensitivity of the MEG~II experiment. Because of its innovative structure and high quality resolution and efficiency the MEG~II cylindrical drift chamber will be a cornerstone in the development of an ideal tracking detector for future positron-electron collider machines. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2310.12865v2-abstract-full').style.display = 'none'; document.getElementById('2310.12865v2-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 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 19 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">27 pages, 42 figures, published on EPJC 84(2024)5,473</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/2207.10990">arXiv:2207.10990</a> <span> [<a href="https://arxiv.org/pdf/2207.10990">pdf</a>, <a href="https://arxiv.org/format/2207.10990">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> <p class="title is-5 mathjax"> The measuring systems of the wire tension for the MEG II Drift Chamber by means of the resonant frequency technique </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=Benmansour%2C+H">H. Benmansour</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=Cuna%2C+F">F. Cuna</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=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=Meucci%2C+M">M. Meucci</a>, <a href="/search/physics?searchtype=author&query=Miccoli%2C+A">A. Miccoli</a>, <a href="/search/physics?searchtype=author&query=Nicolo%27%2C+D">D. Nicolo'</a>, <a href="/search/physics?searchtype=author&query=Panareo%2C+M">M. Panareo</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/physics?searchtype=author&query=Pinto%2C+C">C. Pinto</a>, <a href="/search/physics?searchtype=author&query=Raffaelli%2C+F">F. Raffaelli</a>, <a href="/search/physics?searchtype=author&query=Renga%2C+F">F. Renga</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a>, <a href="/search/physics?searchtype=author&query=Tassielli%2C+G+F">G. F. Tassielli</a>, <a href="/search/physics?searchtype=author&query=Venturini%2C+A">A. Venturini</a> , et al. (2 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="2207.10990v2-abstract-short" style="display: inline;"> The ultra-low mass cylindrical drift chamber designed for the MEG II experiment is a challenging apparatus made of 1728 phi = 20 micron gold plated tungsten sense wires, 7680 phi = 40 micron and 2496 phi = 50 micron silver plated aluminum field wires. Because of electrostatic stability requirements all the wires have to be stretched at mechanical tensions of about 25, 19 and 29 g respectively whic… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.10990v2-abstract-full').style.display = 'inline'; document.getElementById('2207.10990v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.10990v2-abstract-full" style="display: none;"> The ultra-low mass cylindrical drift chamber designed for the MEG II experiment is a challenging apparatus made of 1728 phi = 20 micron gold plated tungsten sense wires, 7680 phi = 40 micron and 2496 phi = 50 micron silver plated aluminum field wires. Because of electrostatic stability requirements all the wires have to be stretched at mechanical tensions of about 25, 19 and 29 g respectively which must be controlled at a level better than 0.5 g. This chamber is presently in acquisition, but during its construction about 100 field wires broke, because of chemical corrosion induced by the atmospheric humidity. On the basis of the experience gained with this chamber we decided to build a new one, equipped with a different type of wires less sensitive to corrosion. The choice of the new wire required a deep inspection of its characteristics and one of the main tools for doing this is a system for measuring the wire tension by means of the resonant frequency technique, which is described in this paper. The system forces the wires to oscillate by applying a sinusoidal signal at a known frequency, and then measures the variation of the capacitance between a wire and a common ground plane as a function of the external signal frequency. We present the details of the measuring system and the results obtained by scanning the mechanical tensions of two samples of MEG II cylindrical drift chamber wires and discuss the possible improvements of the experimental apparatus and of the measuring technique. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.10990v2-abstract-full').style.display = 'none'; document.getElementById('2207.10990v2-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 October, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">Nineteen pages, thirteen figures, published on Nuclear Instruments and Methods A</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl.Instrum.Meth.A 1045 (2023) 167534 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.13948">arXiv:2108.13948</a> <span> [<a href="https://arxiv.org/pdf/2108.13948">pdf</a>, <a href="https://arxiv.org/format/2108.13948">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/10.1088/1748-0221/16/12/T12003">10.1088/1748-0221/16/12/T12003 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Detailed analysis of chemical corrosion of ultra-thin wires used in drift chamber detectors </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=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=Cuna%2C+F">F. Cuna</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=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=Ishak%2C+R">R. Ishak</a>, <a href="/search/physics?searchtype=author&query=Meucci%2C+M">M. Meucci</a>, <a href="/search/physics?searchtype=author&query=Nicol%C3%B3%2C+D">D. Nicol贸</a>, <a href="/search/physics?searchtype=author&query=Panareo%2C+M">M. Panareo</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/physics?searchtype=author&query=Pepino%2C+A">A. Pepino</a>, <a href="/search/physics?searchtype=author&query=Raffaelli%2C+F">F. Raffaelli</a>, <a href="/search/physics?searchtype=author&query=Renga%2C+F">F. Renga</a>, <a href="/search/physics?searchtype=author&query=Ripiccini%2C+E">E. Ripiccini</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a>, <a href="/search/physics?searchtype=author&query=Tassielli%2C+G+F">G. F. Tassielli</a>, <a href="/search/physics?searchtype=author&query=Valentini%2C+R">R. Valentini</a> , et al. (2 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="2108.13948v2-abstract-short" style="display: inline;"> Ultra-thin metallic anodic and cathodic wires are frequently employed in low-mass gaseous detectors for precision experiments, where the amount of material crossed by charged particles must be minimised. We present here the results of an analysis of the mechanical stress and chemical corrosion effects observed in $40$ and $50~{\rm{渭m}}$ diameter silver plated aluminum wires mounted within the volu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.13948v2-abstract-full').style.display = 'inline'; document.getElementById('2108.13948v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.13948v2-abstract-full" style="display: none;"> Ultra-thin metallic anodic and cathodic wires are frequently employed in low-mass gaseous detectors for precision experiments, where the amount of material crossed by charged particles must be minimised. We present here the results of an analysis of the mechanical stress and chemical corrosion effects observed in $40$ and $50~{\rm{渭m}}$ diameter silver plated aluminum wires mounted within the volume of the MEG\,II drift chamber, which caused the breaking of about one hundred wires (over a total of $\approx 12000$). This analysis is based on the accurate inspection of the broken wires by means of optical and electronic microscopes and on a detailed recording of all breaking accidents. We present a simple empirical model which relates the number of broken wires to their exposure time to atmospheric humidity and to their mechanical tension, which is necessary for mechanical stability in the presence of electrostatic fields of several kV/cm. Finally we discuss how wire breakings can be avoided or at least strongly reduced by operating in controlled atmosphere during the mounting stages of the wires within the drift chamber and by choosing a $25\,\%$ thicker wire diameter, which has very small effects on the detector resolution and efficiency and can be obtained by using a safer fabrication technique. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.13948v2-abstract-full').style.display = 'none'; document.getElementById('2108.13948v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 November, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 31 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 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">14 pages, 9 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/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/2006.02378">arXiv:2006.02378</a> <span> [<a href="https://arxiv.org/pdf/2006.02378">pdf</a>, <a href="https://arxiv.org/format/2006.02378">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/10.1088/1748-0221/15/09/C09051">10.1088/1748-0221/15/09/C09051 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Drift Chamber of the MEG II experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Tassielli%2C+G+F">G. F. Tassielli</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</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=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=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=Hildebrandt%2C+M">M. Hildebrandt</a>, <a href="/search/physics?searchtype=author&query=Meucci%2C+M">M. Meucci</a>, <a href="/search/physics?searchtype=author&query=Miccoli%2C+A">A. Miccoli</a>, <a href="/search/physics?searchtype=author&query=Nicol%C3%B2%2C+D">D. Nicol貌</a>, <a href="/search/physics?searchtype=author&query=Panareo%2C+M">M. Panareo</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/physics?searchtype=author&query=Raffaelli%2C+F">F. Raffaelli</a>, <a href="/search/physics?searchtype=author&query=Renga%2C+F">F. Renga</a>, <a href="/search/physics?searchtype=author&query=Schwendimann%2C+P">P. Schwendimann</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a>, <a href="/search/physics?searchtype=author&query=Voena%2C+C">C. Voena</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="2006.02378v2-abstract-short" style="display: inline;"> The MEG experiment at the Paul Scherrer Institut searches for the charged-Lepton-Flavor-Violating mu+ -> e+ gamma decay. MEG has already set the world best upper limit on the branching ratio: BR<4.2x10^-13 @ 90% C.l. An upgrade (MEG II) of the whole detector has been approved to obtain a substantial increase of sensitivity. Currently MEG II is completing the upgrade of the various detectors, an en… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.02378v2-abstract-full').style.display = 'inline'; document.getElementById('2006.02378v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.02378v2-abstract-full" style="display: none;"> The MEG experiment at the Paul Scherrer Institut searches for the charged-Lepton-Flavor-Violating mu+ -> e+ gamma decay. MEG has already set the world best upper limit on the branching ratio: BR<4.2x10^-13 @ 90% C.l. An upgrade (MEG II) of the whole detector has been approved to obtain a substantial increase of sensitivity. Currently MEG II is completing the upgrade of the various detectors, an engineering run and a pre-commissioning run were carried out during 2018 and 2019. The new positron tracker is a unique volume, ultra-light He based cylindrical drift chamber (CDCH), with high granularity: 9 layers of 192 square drift cells, ~6-9 mm wide, consist of ~12000 wires in a full stereo configuration. To ensure the electrostatic stability of the drift cells a new wiring strategy should be developed due to the high wire density (12 wires/cm^2 ), the stringent precision requirements on the wire position and uniformity of the wire mechanical tension (better than 0.5 g) The basic idea is to create multiwire frames, by soldering a set of (16 or 32) wires on 40 um thick custom wire-PCBs. Multiwire frames and PEEK spacers are overlapped alternately along the radius, to set the proper cell width, in each of the twelve sectors defined by the spokes of the rudder wheel shaped end-plates. Despite to the conceptual simplicity of the assembling strategies, the building of the multiwire frames, with the set requirements, imposes a use of an automatic wiring system. The MEG II CDCH is the first cylindrical drift chamber ever designed and built in a modular way and it will allow to track positrons, with a momentum greater than 45 MeV/c, with high efficiency by using a very small amount of material, 1.5x10^-3 X0 . We describe the CDCH design and construction, the wiring phase at INFN-Lecce, the choice of the wires, their mechanical properties, the assembly and sealing at INFN-Pisa and the commissioning. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.02378v2-abstract-full').style.display = 'none'; document.getElementById('2006.02378v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 3 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">11 pages, 8 figures, 1 table, proceeding at INSTR'20 conference, accepted for publication in JINST</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.02242">arXiv:2005.02242</a> <span> [<a href="https://arxiv.org/pdf/2005.02242">pdf</a>, <a href="https://arxiv.org/format/2005.02242">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/10.1088/1748-0221/15/06/C06056">10.1088/1748-0221/15/06/C06056 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Commissioning of the MEG II tracker system </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Chiappini%2C+M">M. Chiappini</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</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=Corvaglia%2C+A">A. Corvaglia</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=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=Hildebrandt%2C+M">M. Hildebrandt</a>, <a href="/search/physics?searchtype=author&query=Meucci%2C+M">M. Meucci</a>, <a href="/search/physics?searchtype=author&query=Miccoli%2C+A">A. Miccoli</a>, <a href="/search/physics?searchtype=author&query=Nicol%C3%B2%2C+D">D. Nicol貌</a>, <a href="/search/physics?searchtype=author&query=Panareo%2C+M">M. Panareo</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/physics?searchtype=author&query=Raffaelli%2C+F">F. Raffaelli</a>, <a href="/search/physics?searchtype=author&query=Renga%2C+F">F. Renga</a>, <a href="/search/physics?searchtype=author&query=Schwendimann%2C+P">P. Schwendimann</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a>, <a href="/search/physics?searchtype=author&query=Tassielli%2C+G+F">G. F. Tassielli</a>, <a href="/search/physics?searchtype=author&query=Voena%2C+C">C. Voena</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="2005.02242v1-abstract-short" style="display: inline;"> The MEG experiment at the Paul Scherrer Institut (PSI) represents the state of the art in the search for the charged Lepton Flavour Violating (cLFV) $渭^+ \rightarrow e^+ 纬$ decay. With the phase 1, MEG set the new world best upper limit on the $\mbox{BR}(渭^+ \rightarrow e^+ 纬) < 4.2 \times 10^{-13}$ (90% C.L.). With the phase 2, MEG II, the experiment aims at reaching a sensitivity enhancement of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.02242v1-abstract-full').style.display = 'inline'; document.getElementById('2005.02242v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.02242v1-abstract-full" style="display: none;"> The MEG experiment at the Paul Scherrer Institut (PSI) represents the state of the art in the search for the charged Lepton Flavour Violating (cLFV) $渭^+ \rightarrow e^+ 纬$ decay. With the phase 1, MEG set the new world best upper limit on the $\mbox{BR}(渭^+ \rightarrow e^+ 纬) < 4.2 \times 10^{-13}$ (90% C.L.). With the phase 2, MEG II, the experiment aims at reaching a sensitivity enhancement of about one order of magnitude compared to the previous MEG result. The new Cylindrical Drift CHamber (CDCH) is a key detector for MEG II. CDCH is a low-mass single volume detector with high granularity: 9 layers of 192 drift cells, few mm wide, defined by $\sim 12000$ wires in a stereo configuration for longitudinal hit localization. The filling gas mixture is Helium:Isobutane (90:10). The total radiation length is $1.5 \times 10^{-3}$ $\mbox{X}_0$, thus minimizing the Multiple Coulomb Scattering (MCS) contribution and allowing for a single-hit resolution $< 120$ $渭$m and an angular and momentum resolutions of 6 mrad and 90 keV/c respectively. This article presents the CDCH commissioning activities at PSI after the wiring phase at INFN Lecce and the assembly phase at INFN Pisa. The endcaps preparation, HV tests and conditioning of the chamber are described, aiming at reaching the final stable working point. The integration into the MEG II experimental apparatus is described, in view of the first data taking with cosmic rays and $渭^+$ beam during the 2018 and 2019 engineering runs. The first gas gain results are also shown. A full engineering run with all the upgraded detectors and the complete DAQ electronics is expected to start in 2020, followed by three years of physics data taking. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.02242v1-abstract-full').style.display = 'none'; document.getElementById('2005.02242v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">10 pages, 12 figures, 1 table, proceeding at INSTR'20 conference, accepted for publication in JINST</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.02241">arXiv:2005.02241</a> <span> [<a href="https://arxiv.org/pdf/2005.02241">pdf</a>, <a href="https://arxiv.org/format/2005.02241">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.2018.10.182">10.1016/j.nima.2018.10.182 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The new drift chamber of the MEG II experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Chiappini%2C+M">M. Chiappini</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">A. M. Baldini</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=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=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=Hildebrandt%2C+M">M. Hildebrandt</a>, <a href="/search/physics?searchtype=author&query=Nicol%C3%B2%2C+D">D. Nicol貌</a>, <a href="/search/physics?searchtype=author&query=Panareo%2C+M">M. Panareo</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/physics?searchtype=author&query=Raffaelli%2C+F">F. Raffaelli</a>, <a href="/search/physics?searchtype=author&query=Renga%2C+F">F. Renga</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a>, <a href="/search/physics?searchtype=author&query=Tassielli%2C+G+F">G. F. Tassielli</a>, <a href="/search/physics?searchtype=author&query=Voena%2C+C">C. Voena</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="2005.02241v1-abstract-short" style="display: inline;"> This article presents the MEG II Cylindrical Drift CHamber (CDCH), a key detector for the phase 2 of MEG, which aims at reaching a sensitivity level of the order of $6 \times 10^{-14}$ for the charged Lepton Flavour Violating $渭^+ \rightarrow \mbox{e}^+ 纬$ decay. CDCH is designed to overcome the limitations of the MEG $\mbox{e}^+$ tracker and guarantee the proper operation at high rates with long-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.02241v1-abstract-full').style.display = 'inline'; document.getElementById('2005.02241v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.02241v1-abstract-full" style="display: none;"> This article presents the MEG II Cylindrical Drift CHamber (CDCH), a key detector for the phase 2 of MEG, which aims at reaching a sensitivity level of the order of $6 \times 10^{-14}$ for the charged Lepton Flavour Violating $渭^+ \rightarrow \mbox{e}^+ 纬$ decay. CDCH is designed to overcome the limitations of the MEG $\mbox{e}^+$ tracker and guarantee the proper operation at high rates with long-term detector stability. CDCH is a low-mass unique volume detector with high granularity: 9 layers of 192 drift cells, few mm wide, defined by $\approx 12000$ wires in a stereo configuration for longitudinal hit localization. The total radiation length is $1.5 \times 10^{-3}$ $\mbox{X}_0$, thus minimizing the Multiple Coulomb Scattering (MCS) contribution and allowing for a single-hit resolution of 110 $渭$m and a momentum resolution of 130 keV/c. CDCH integration into the MEG II experimental apparatus will start in this year. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.02241v1-abstract-full').style.display = 'none'; document.getElementById('2005.02241v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 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">2 pages, 3 figures, proceeding at PisaMeeting2018 conference, published in NIMA</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Inst. and Methods in Physics Research A (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1907.04166">arXiv:1907.04166</a> <span> [<a href="https://arxiv.org/pdf/1907.04166">pdf</a>, <a href="https://arxiv.org/ps/1907.04166">ps</a>, <a href="https://arxiv.org/format/1907.04166">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.2018.11.108">10.1016/j.nima.2018.11.108 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Mu2e calorimeter readout system </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Atanov%2C+N">N. Atanov</a>, <a href="/search/physics?searchtype=author&query=Baranov%2C+V">V. Baranov</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+L">L. Baldini</a>, <a href="/search/physics?searchtype=author&query=Budagov%2C+J">J. Budagov</a>, <a href="/search/physics?searchtype=author&query=Caiulo%2C+D">D. Caiulo</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=Cervelli%2C+F">F. Cervelli</a>, <a href="/search/physics?searchtype=author&query=Colao%2C+F">F. Colao</a>, <a href="/search/physics?searchtype=author&query=Cordelli%2C+M">M. Cordelli</a>, <a href="/search/physics?searchtype=author&query=Corradi%2C+G">G. Corradi</a>, <a href="/search/physics?searchtype=author&query=Davydov%2C+Y+I">Yu. I. Davydov</a>, <a href="/search/physics?searchtype=author&query=D%27Errico%2C+F">F. D'Errico</a>, <a href="/search/physics?searchtype=author&query=Di+Falco%2C+S">S. Di Falco</a>, <a href="/search/physics?searchtype=author&query=Diociaiuti%2C+E">E. Diociaiuti</a>, <a href="/search/physics?searchtype=author&query=Donati%2C+S">S. Donati</a>, <a href="/search/physics?searchtype=author&query=Donghia%2C+R">R. Donghia</a>, <a href="/search/physics?searchtype=author&query=Echenard%2C+B">B. Echenard</a>, <a href="/search/physics?searchtype=author&query=Faetti%2C+S">S. Faetti</a>, <a href="/search/physics?searchtype=author&query=Giovannella%2C+S">S. Giovannella</a>, <a href="/search/physics?searchtype=author&query=Giudici%2C+S">S. Giudici</a>, <a href="/search/physics?searchtype=author&query=Glagolev%2C+V">V. Glagolev</a>, <a href="/search/physics?searchtype=author&query=Grancagnolo%2C+F">F. Grancagnolo</a>, <a href="/search/physics?searchtype=author&query=Happacher%2C+F">F. Happacher</a>, <a href="/search/physics?searchtype=author&query=Hitlin%2C+D+G">D. G. Hitlin</a>, <a href="/search/physics?searchtype=author&query=Lazzeri%2C+L">L. Lazzeri</a> , et al. (21 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1907.04166v1-abstract-short" style="display: inline;"> The Mu2e electromagnetic calorimeter is made of two disks of un-doped parallelepiped CsI crystals readout by SiPM. There are 674 crystals in one disk and each crystal is readout by an array of two SiPM. The readout electronics is composed of two types of modules: 1) the front-end module hosts the shaping amplifier and the high voltage linear regulator; since one front-end module is interfaced to o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.04166v1-abstract-full').style.display = 'inline'; document.getElementById('1907.04166v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1907.04166v1-abstract-full" style="display: none;"> The Mu2e electromagnetic calorimeter is made of two disks of un-doped parallelepiped CsI crystals readout by SiPM. There are 674 crystals in one disk and each crystal is readout by an array of two SiPM. The readout electronics is composed of two types of modules: 1) the front-end module hosts the shaping amplifier and the high voltage linear regulator; since one front-end module is interfaced to one SiPM, a total of 2696 modules are needed for the entire calorimeter; 2) a waveform digitizer provides a further level of amplification and digitizes the SiPM signal at the sampling frequency of $200\ \text{M}\text{Hz}$ with 12-bits ADC resolution; since one board digitizes the data received from 20 SiPMs, a total of 136 boards are needed. The readout system operational conditions are hostile: ionization dose of $20\ \text{krads}$, neutron flux of $10^{12}\ \mathrm{n}(1\ \text{MeVeq})/\text{cm}^2$, magnetic field of $1\ \text{T}$ and in vacuum level of $10^{-4}\ \text{Torr}$. A description of the readout system and qualification tests is reported. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1907.04166v1-abstract-full').style.display = 'none'; document.getElementById('1907.04166v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 July, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Inst. and Methods in Physics Research, A, 2019 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1806.09218">arXiv:1806.09218</a> <span> [<a href="https://arxiv.org/pdf/1806.09218">pdf</a>, <a href="https://arxiv.org/format/1806.09218">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> <p class="title is-5 mathjax"> The WaveDAQ integrated Trigger and Data Acquisition System for the MEG II experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Francesconi%2C+M">Marco Francesconi</a>, <a href="/search/physics?searchtype=author&query=Baldini%2C+A+M">Alessandro Massimo Baldini</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=Galli%2C+L">Luca Galli</a>, <a href="/search/physics?searchtype=author&query=Grassi%2C+M">Marco Grassi</a>, <a href="/search/physics?searchtype=author&query=Hartmann%2C+U">Ueli Hartmann</a>, <a href="/search/physics?searchtype=author&query=Meucci%2C+M">Manuel Meucci</a>, <a href="/search/physics?searchtype=author&query=Morsani%2C+F">Fabio Morsani</a>, <a href="/search/physics?searchtype=author&query=Nicol%C3%B2%2C+D">Donato Nicol貌</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">Angela Papa</a>, <a href="/search/physics?searchtype=author&query=Ritt%2C+S">Stefan Ritt</a>, <a href="/search/physics?searchtype=author&query=Schmid%2C+E">Elmar Schmid</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">Giovanni Signorelli</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="1806.09218v1-abstract-short" style="display: inline;"> The WaveDAQ is a newly-designed digitization Trigger and Data AcQuisition system (TDAQ) allowing Multi-gigasample waveform recording on a large amount of channels (up to 16384) by using the DRS4 analog switched capacitor array as downconverting ASIC. A high bandwidth, programmable input stage has been coupled with a bias generator to allow SiPM operation without need of any other external apparatu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.09218v1-abstract-full').style.display = 'inline'; document.getElementById('1806.09218v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.09218v1-abstract-full" style="display: none;"> The WaveDAQ is a newly-designed digitization Trigger and Data AcQuisition system (TDAQ) allowing Multi-gigasample waveform recording on a large amount of channels (up to 16384) by using the DRS4 analog switched capacitor array as downconverting ASIC. A high bandwidth, programmable input stage has been coupled with a bias generator to allow SiPM operation without need of any other external apparatus. The trigger generation is tightly coupled within the system to limit the required depth of the analog memory, allowing faster digitization speeds. This system has been designed for the MEG experiment upgrade but also proved to be highly scalable and already found other applications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.09218v1-abstract-full').style.display = 'none'; document.getElementById('1806.09218v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 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">This manuscript is for conference record of the 21st IEEE Real Time conference only</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1804.08482">arXiv:1804.08482</a> <span> [<a href="https://arxiv.org/pdf/1804.08482">pdf</a>, <a href="https://arxiv.org/format/1804.08482">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/10.1088/1748-0221/13/06/P06018">10.1088/1748-0221/13/06/P06018 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Gas Distribution and Monitoring for the Drift Chamber 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=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=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=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=Hildebrandt%2C+M">M. Hildebrandt</a>, <a href="/search/physics?searchtype=author&query=Martinelli%2C+V">V. Martinelli</a>, <a href="/search/physics?searchtype=author&query=Meucci%2C+M">M. Meucci</a>, <a href="/search/physics?searchtype=author&query=Nicol%C3%B2%2C+D">D. Nicol貌</a>, <a href="/search/physics?searchtype=author&query=Panareo%2C+M">M. Panareo</a>, <a href="/search/physics?searchtype=author&query=Papa%2C+A">A. Papa</a>, <a href="/search/physics?searchtype=author&query=Pepino%2C+A">A. Pepino</a>, <a href="/search/physics?searchtype=author&query=Pruneti%2C+B">B. Pruneti</a>, <a href="/search/physics?searchtype=author&query=Raffaelli%2C+F">F. Raffaelli</a>, <a href="/search/physics?searchtype=author&query=Renga%2C+F">F. Renga</a>, <a href="/search/physics?searchtype=author&query=Ripiccini%2C+E">E. Ripiccini</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a>, <a href="/search/physics?searchtype=author&query=Tassielli%2C+G+F">G. F. Tassielli</a>, <a href="/search/physics?searchtype=author&query=Voena%2C+C">C. Voena</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="1804.08482v1-abstract-short" style="display: inline;"> The reconstruction of the positron trajectory in the MEG-II experiment searching for the $渭^+ \to e^+ 纬$ decay uses a cylindrical drift chamber operated with a helium-isobutane gas mixture. A stable performance of the detector in terms of its electron drift properties, avalanche multiplication, and with a gas mixture of controlled composition and purity has to be provided and continuously monitore… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.08482v1-abstract-full').style.display = 'inline'; document.getElementById('1804.08482v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1804.08482v1-abstract-full" style="display: none;"> The reconstruction of the positron trajectory in the MEG-II experiment searching for the $渭^+ \to e^+ 纬$ decay uses a cylindrical drift chamber operated with a helium-isobutane gas mixture. A stable performance of the detector in terms of its electron drift properties, avalanche multiplication, and with a gas mixture of controlled composition and purity has to be provided and continuously monitored. In this paper we describe the strategies adopted to meet the requirements imposed by the target sensitivity of MEG-II, including the construction and commissioning of a small chamber for an online monitoring of the gas quality. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1804.08482v1-abstract-full').style.display = 'none'; document.getElementById('1804.08482v1-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, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 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">12 pages, 6 figures, submitted to Journal 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/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/1605.07970">arXiv:1605.07970</a> <span> [<a href="https://arxiv.org/pdf/1605.07970">pdf</a>, <a href="https://arxiv.org/format/1605.07970">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/10.1088/1748-0221/11/07/P07011">10.1088/1748-0221/11/07/P07011 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Single-hit resolution measurement with MEG II drift chamber prototypes </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=Cavoto%2C+G">G. Cavoto</a>, <a href="/search/physics?searchtype=author&query=Cascella%2C+M">M. Cascella</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=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=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=Martinelli%2C+V">V. Martinelli</a>, <a href="/search/physics?searchtype=author&query=Nicol%C3%B2%2C+D">D. Nicol貌</a>, <a href="/search/physics?searchtype=author&query=Panareo%2C+M">M. Panareo</a>, <a href="/search/physics?searchtype=author&query=Pepino%2C+A">A. Pepino</a>, <a href="/search/physics?searchtype=author&query=Piredda%2C+G">G. Piredda</a>, <a href="/search/physics?searchtype=author&query=Renga%2C+F">F. Renga</a>, <a href="/search/physics?searchtype=author&query=Ripiccini%2C+E">E. Ripiccini</a>, <a href="/search/physics?searchtype=author&query=Signorelli%2C+G">G. Signorelli</a>, <a href="/search/physics?searchtype=author&query=Tassielli%2C+G+F">G. F. Tassielli</a>, <a href="/search/physics?searchtype=author&query=Tenchini%2C+F">F. Tenchini</a>, <a href="/search/physics?searchtype=author&query=Venturini%2C+M">M. Venturini</a>, <a href="/search/physics?searchtype=author&query=Voena%2C+C">C. Voena</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1605.07970v1-abstract-short" style="display: inline;"> Drift chambers operated with helium-based gas mixtures represent a common solution for tracking charged particles keeping the material budget in the sensitive volume to a minimum. The drawback of this solution is the worsening of the spatial resolution due to primary ionisation fluctuations, which is a limiting factor for high granularity drift chambers like the MEG II tracker. We report on the me… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.07970v1-abstract-full').style.display = 'inline'; document.getElementById('1605.07970v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1605.07970v1-abstract-full" style="display: none;"> Drift chambers operated with helium-based gas mixtures represent a common solution for tracking charged particles keeping the material budget in the sensitive volume to a minimum. The drawback of this solution is the worsening of the spatial resolution due to primary ionisation fluctuations, which is a limiting factor for high granularity drift chambers like the MEG II tracker. We report on the measurements performed on three different prototypes of the MEG II drift chamber aimed at determining the achievable single-hit resolution. The prototypes were operated with helium/isobutane gas mixtures and exposed to cosmic rays, electron beams and radioactive sources. Direct measurements of the single hit resolution performed with an external tracker returned a value of 110 $渭$m, consistent with the values obtained with indirect measurements performed with the other prototypes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.07970v1-abstract-full').style.display = 'none'; document.getElementById('1605.07970v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 18 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/1605.05081">arXiv:1605.05081</a> <span> [<a href="https://arxiv.org/pdf/1605.05081">pdf</a>, <a href="https://arxiv.org/format/1605.05081">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"> Search for the Lepton Flavour Violating Decay $渭^{+} \to e^+ 纬$ with the Full Dataset of the MEG Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=The+MEG+Collaboration"> The MEG Collaboration</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1605.05081v3-abstract-short" style="display: inline;"> The final results of the search for the lepton flavour violating decay $渭^{+} \rightarrow {\rm e^{+}} 纬$ based on the full dataset collected by the MEG experiment at the Paul Scherrer Institut in the period 2009--2013 and totalling $7.5\times 10^{14}$ stopped muons on target are presented. No significant excess of events is observed in the dataset with respect to the expected background and a new… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.05081v3-abstract-full').style.display = 'inline'; document.getElementById('1605.05081v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1605.05081v3-abstract-full" style="display: none;"> The final results of the search for the lepton flavour violating decay $渭^{+} \rightarrow {\rm e^{+}} 纬$ based on the full dataset collected by the MEG experiment at the Paul Scherrer Institut in the period 2009--2013 and totalling $7.5\times 10^{14}$ stopped muons on target are presented. No significant excess of events is observed in the dataset with respect to the expected background and a new upper limit on the branching ratio of this decay of $BR( 渭^{+} \rightarrow {\rm e^{+}} 纬) < 4.2 \times 10^{-13}$ (90\%\ confidence level) is established, which represents the most stringent limit on the existence of this decay to date. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1605.05081v3-abstract-full').style.display = 'none'; document.getElementById('1605.05081v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 July, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 May, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">30 pages, 31 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/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/1307.5538">arXiv:1307.5538</a> <span> [<a href="https://arxiv.org/pdf/1307.5538">pdf</a>, <a href="https://arxiv.org/format/1307.5538">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"> Dual-readout Calorimetry </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Akchurin%2C+N">N. Akchurin</a>, <a href="/search/physics?searchtype=author&query=Bedeschi%2C+F">F. Bedeschi</a>, <a href="/search/physics?searchtype=author&query=Cardini%2C+A">A. Cardini</a>, <a href="/search/physics?searchtype=author&query=Cascella%2C+M">M. Cascella</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">F. Cei</a>, <a href="/search/physics?searchtype=author&query=De+Pedis%2C+D">D. De Pedis</a>, <a href="/search/physics?searchtype=author&query=Fracchia%2C+S">S. Fracchia</a>, <a href="/search/physics?searchtype=author&query=Franchino%2C+S">S. Franchino</a>, <a href="/search/physics?searchtype=author&query=Fraternali%2C+M">M. Fraternali</a>, <a href="/search/physics?searchtype=author&query=Gaudio%2C+G">G. Gaudio</a>, <a href="/search/physics?searchtype=author&query=Genova%2C+P">P. Genova</a>, <a href="/search/physics?searchtype=author&query=Hauptman%2C+J">J. Hauptman</a>, <a href="/search/physics?searchtype=author&query=La+Rotonda%2C+L">L. La Rotonda</a>, <a href="/search/physics?searchtype=author&query=Lee%2C+S">S. Lee</a>, <a href="/search/physics?searchtype=author&query=Livan%2C+M">M. Livan</a>, <a href="/search/physics?searchtype=author&query=Meoni%2C+E">E. Meoni</a>, <a href="/search/physics?searchtype=author&query=Moggi%2C+A">A. Moggi</a>, <a href="/search/physics?searchtype=author&query=Pinci%2C+D">D. Pinci</a>, <a href="/search/physics?searchtype=author&query=Policicchio%2C+A">A. Policicchio</a>, <a href="/search/physics?searchtype=author&query=Saraiva%2C+J+G">J. G. Saraiva</a>, <a href="/search/physics?searchtype=author&query=Sill%2C+A">A. Sill</a>, <a href="/search/physics?searchtype=author&query=Venturelli%2C+T">T. Venturelli</a>, <a href="/search/physics?searchtype=author&query=Wigmans%2C+R">R. Wigmans</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="1307.5538v3-abstract-short" style="display: inline;"> The RD52 Project at CERN is a pure instrumentation experiment whose goal is to understand the fundamental limitations to hadronic energy resolution, and other aspects of energy measurement, in high energy calorimeters. We have found that dual-readout calorimetry provides heretofore unprecedented information event-by-event for energy resolution, linearity of response, ease and robustness of calibra… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1307.5538v3-abstract-full').style.display = 'inline'; document.getElementById('1307.5538v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1307.5538v3-abstract-full" style="display: none;"> The RD52 Project at CERN is a pure instrumentation experiment whose goal is to understand the fundamental limitations to hadronic energy resolution, and other aspects of energy measurement, in high energy calorimeters. We have found that dual-readout calorimetry provides heretofore unprecedented information event-by-event for energy resolution, linearity of response, ease and robustness of calibration, fidelity of data, and particle identification, including energy lost to binding energy in nuclear break-up. We believe that hadronic energy resolutions of 蟽/E $\approx$ 1 - 2% are within reach for dual-readout calorimeters, enabling for the first time comparable measurement preci- sions on electrons, photons, muons, and quarks (jets). We briefly describe our current progress and near-term future plans. Complete information on all aspects of our work is available at the RD52 website http://highenergy.phys.ttu.edu/dream/. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1307.5538v3-abstract-full').style.display = 'none'; document.getElementById('1307.5538v3-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> 30 July, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 July, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">10 pages, 10 figures, Snowmass White paper</span> </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/1102.0106">arXiv:1102.0106</a> <span> [<a href="https://arxiv.org/pdf/1102.0106">pdf</a>, <a href="https://arxiv.org/format/1102.0106">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/epjp/i2011-11060-6">10.1140/epjp/i2011-11060-6 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Architecture of MEG Simulation and Analysis Software </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Cattaneo%2C+P+W">Paolo W. Cattaneo</a>, <a href="/search/physics?searchtype=author&query=Cei%2C+F">Fabrizio Cei</a>, <a href="/search/physics?searchtype=author&query=Sawada%2C+R">Ryu Sawada</a>, <a href="/search/physics?searchtype=author&query=Schneebeli%2C+M">Matthias Schneebeli</a>, <a href="/search/physics?searchtype=author&query=Yamada%2C+S">Shuei Yamada</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="1102.0106v2-abstract-short" style="display: inline;"> MEG (Mu to Electron Gamma) is an experiment dedicated to search for the $渭^+ \rightarrow e^+纬$ decay that is strongly suppressed in the Standard Model but predicted in several Super Symmetric extensions of it at an accessible rate. MEG is a small-size experiment ($\approx 50-60$ physicists at any time) with a life span of about 10 years. The limited human resource available, in particular in the c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.0106v2-abstract-full').style.display = 'inline'; document.getElementById('1102.0106v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1102.0106v2-abstract-full" style="display: none;"> MEG (Mu to Electron Gamma) is an experiment dedicated to search for the $渭^+ \rightarrow e^+纬$ decay that is strongly suppressed in the Standard Model but predicted in several Super Symmetric extensions of it at an accessible rate. MEG is a small-size experiment ($\approx 50-60$ physicists at any time) with a life span of about 10 years. The limited human resource available, in particular in the core offline group, emphasized the importance of reusing software and exploiting existing expertise. Great care has been devoted to provide a simple system that hides implementation details to the average programmer. That allowed many members of the collaboration to contribute to the development of the software of the experiment with limited programming skill. The offline software is based on two frameworks: {\bf REM} in FORTRAN 77 used for the event generation and detector simulation package {\bf GEM}, based on GEANT 3, and {\bf ROME} in C++ used in the readout simulation {\bf Bartender} and in the reconstruction and analysis program {\bf Analyzer}. Event display in the simulation is based on GEANT 3 graphic libraries and in the reconstruction on ROOT graphic libraries. Data are stored in different formats in various stage of the processing. The frameworks include utilities for input/output, database handling and format conversion transparent to the user. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1102.0106v2-abstract-full').style.display = 'none'; document.getElementById('1102.0106v2-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 June, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 1 February, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Presented at the IEEE NSS Knoxville, 2010 Revised according to referee's remarks Accepted by European Physical Journal Plus</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur.Phys.J.Plus 126:60,2011 </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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