Search | arXiv e-print repository

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"/> <meta name="viewport" content="width=device-width, initial-scale=1"/>  <link rel="apple-touch-icon" sizes="180x180" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/apple-touch-icon.png"> <link rel="icon" type="image/png" sizes="32x32" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/favicon-32x32.png"> <link rel="icon" type="image/png" sizes="16x16" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/favicon-16x16.png"> <link rel="manifest" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/site.webmanifest"> <link rel="mask-icon" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/safari-pinned-tab.svg" color="#b31b1b"> <link rel="shortcut icon" href="https://static.arxiv.org/static/base/1.0.0a5/images/icons/favicon.ico"> <meta name="msapplication-TileColor" content="#b31b1b"> <meta name="msapplication-config" content="images/icons/browserconfig.xml"> <meta name="theme-color" content="#b31b1b">  <title>Search | arXiv e-print repository</title> <script defer src="https://static.arxiv.org/static/base/1.0.0a5/fontawesome-free-5.11.2-web/js/all.js"></script> <link rel="stylesheet" href="https://static.arxiv.org/static/base/1.0.0a5/css/arxivstyle.css" /> <script type="text/x-mathjax-config"> MathJax.Hub.Config({ messageStyle: "none", extensions: ["tex2jax.js"], jax: ["input/TeX", "output/HTML-CSS"], tex2jax: { inlineMath: [ ['$','$'], ["\$","\$"] ], displayMath: [ ['$$','$$'], ["\\[","\\]"] ], processEscapes: true, ignoreClass: '.*', processClass: 'mathjax.*' }, TeX: { extensions: ["AMSmath.js", "AMSsymbols.js", "noErrors.js"], noErrors: { inlineDelimiters: ["$","$"], multiLine: false, style: { "font-size": "normal", "border": "" } } }, "HTML-CSS": { availableFonts: ["TeX"] } }); </script> <script src='//static.arxiv.org/MathJax-2.7.3/MathJax.js'></script> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/notification.js"></script> <link rel="stylesheet" href="https://static.arxiv.org/static/search/0.5.6/css/bulma-tooltip.min.css" /> <link rel="stylesheet" href="https://static.arxiv.org/static/search/0.5.6/css/search.css" /> <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha256-k2WSCIexGzOj3Euiig+TlR8gA0EmPjuc79OEeY5L45g=" crossorigin="anonymous"></script> <script src="https://static.arxiv.org/static/search/0.5.6/js/fieldset.js"></script> <style> radio#cf-customfield_11400 { display: none; } </style> </head> <body> <header><a href="#main-container" class="is-sr-only">Skip to main content</a>  <div class="attribution level is-marginless" role="banner"> <div class="level-left"> <a class="level-item" href="https://cornell.edu/"><img src="https://static.arxiv.org/static/base/1.0.0a5/images/cornell-reduced-white-SMALL.svg" alt="Cornell University" width="200" aria-label="logo" /></a> </div> <div class="level-right is-marginless"><p class="sponsors level-item is-marginless"><span id="support-ack-url">We gratefully acknowledge support from<br /> the Simons Foundation, <a href="https://info.arxiv.org/about/ourmembers.html">member institutions</a>, and all contributors. <a href="https://info.arxiv.org/about/donate.html">Donate</a></span></p></div> </div>  <div class="identity level is-marginless"> <div class="level-left"> <div class="level-item"> <a class="arxiv" href="https://arxiv.org/" aria-label="arxiv-logo"> <img src="https://static.arxiv.org/static/base/1.0.0a5/images/arxiv-logo-one-color-white.svg" aria-label="logo" alt="arxiv logo" width="85" style="width:85px;"/> </a> </div> </div> <div class="search-block level-right"> <form class="level-item mini-search" method="GET" action="https://arxiv.org/search"> <div class="field has-addons"> <div class="control"> <input class="input is-small" type="text" name="query" placeholder="Search..." aria-label="Search term or terms" /> <p class="help"><a href="https://info.arxiv.org/help">Help</a> | <a href="https://arxiv.org/search/advanced">Advanced Search</a></p> </div> <div class="control"> <div class="select is-small"> <select name="searchtype" aria-label="Field to search"> <option value="all" selected="selected">All fields</option> <option value="title">Title</option> <option value="author">Author</option> <option value="abstract">Abstract</option> <option value="comments">Comments</option> <option value="journal_ref">Journal reference</option> <option value="acm_class">ACM classification</option> <option value="msc_class">MSC classification</option> <option value="report_num">Report number</option> <option value="paper_id">arXiv identifier</option> <option value="doi">DOI</option> <option value="orcid">ORCID</option> <option value="author_id">arXiv author ID</option> <option value="help">Help pages</option> <option value="full_text">Full text</option> </select> </div> </div> <input type="hidden" name="source" value="header"> <button class="button is-small is-cul-darker">Search</button> </div> </form> </div> </div>  <div class="container"> <div class="user-tools is-size-7 has-text-right has-text-weight-bold" role="navigation" aria-label="User menu"> <a href="https://arxiv.org/login">Login</a> </div> </div> </header> <main class="container" id="main-container"> <div class="level is-marginless"> <div class="level-left"> <h1 class="title is-clearfix"> Showing 1–16 of 16 results for author: <span class="mathjax">Chiappini, M</span> </h1> </div> <div class="level-right is-hidden-mobile">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> <div class="content"> <form method="GET" action="/search/physics" aria-role="search"> Searching in archive <strong>physics</strong>. <a href="/search/?searchtype=author&query=Chiappini%2C+M">Search in all archives.</a> <div class="field has-addons-tablet"> <div class="control is-expanded"> <label for="query" class="hidden-label">Search term or terms</label> <input class="input is-medium" id="query" name="query" placeholder="Search term..." type="text" value="Chiappini, M"> </div> <div class="select control is-medium"> <label class="is-hidden" for="searchtype">Field</label> <select class="is-medium" id="searchtype" name="searchtype"><option value="all">All fields</option><option value="title">Title</option><option selected value="author">Author(s)</option><option value="abstract">Abstract</option><option value="comments">Comments</option><option value="journal_ref">Journal reference</option><option value="acm_class">ACM classification</option><option value="msc_class">MSC classification</option><option value="report_num">Report number</option><option value="paper_id">arXiv identifier</option><option value="doi">DOI</option><option value="orcid">ORCID</option><option value="license">License (URI)</option><option value="author_id">arXiv author ID</option><option value="help">Help pages</option><option value="full_text">Full text</option></select> </div> <div class="control"> <button class="button is-link is-medium">Search</button> </div> </div> <div class="field"> <div class="control is-size-7"> <label class="radio"> <input checked id="abstracts-0" name="abstracts" type="radio" value="show"> Show abstracts </label> <label class="radio"> <input id="abstracts-1" name="abstracts" type="radio" value="hide"> Hide abstracts </label> </div> </div> <div class="is-clearfix" style="height: 2.5em"> <div class="is-pulled-right"> <a href="/search/advanced?terms-0-term=Chiappini%2C+M&terms-0-field=author&size=50&order=-announced_date_first">Advanced Search</a> </div> </div> <input type="hidden" name="order" value="-announced_date_first"> <input type="hidden" name="size" value="50"> </form> <div class="level breathe-horizontal"> <div class="level-left"> <form method="GET" action="/search/"> <div style="display: none;"> <select id="searchtype" name="searchtype"><option value="all">All fields</option><option value="title">Title</option><option selected value="author">Author(s)</option><option value="abstract">Abstract</option><option value="comments">Comments</option><option value="journal_ref">Journal reference</option><option value="acm_class">ACM classification</option><option value="msc_class">MSC classification</option><option value="report_num">Report number</option><option value="paper_id">arXiv identifier</option><option value="doi">DOI</option><option value="orcid">ORCID</option><option value="license">License (URI)</option><option value="author_id">arXiv author ID</option><option value="help">Help pages</option><option value="full_text">Full text</option></select> <input id="query" name="query" type="text" value="Chiappini, M"> <ul id="abstracts"><li><input checked id="abstracts-0" name="abstracts" type="radio" value="show"> <label for="abstracts-0">Show abstracts</label></li><li><input id="abstracts-1" name="abstracts" type="radio" value="hide"> <label for="abstracts-1">Hide abstracts</label></li></ul> </div> <div class="box field is-grouped is-grouped-multiline level-item"> <div class="control"> <span class="select is-small"> <select id="size" name="size"><option value="25">25</option><option selected value="50">50</option><option value="100">100</option><option value="200">200</option></select> </span> <label for="size">results per page</label>. </div> <div class="control"> <label for="order">Sort results by</label> <span class="select is-small"> <select id="order" name="order"><option selected value="-announced_date_first">Announcement date (newest first)</option><option value="announced_date_first">Announcement date (oldest first)</option><option value="-submitted_date">Submission date (newest first)</option><option value="submitted_date">Submission date (oldest first)</option><option value="">Relevance</option></select> </span> </div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.04431">arXiv:2401.04431</a> <span> [<a href="https://arxiv.org/pdf/2401.04431">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Machine Learning">cs.LG</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atmospheric and Oceanic Physics">physics.ao-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3389/fmars.2022.798167">10.3389/fmars.2022.798167 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Sea wave data reconstruction using micro-seismic measurements and machine learning methods </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Iafolla%2C+L">Lorenzo Iafolla</a>, <a href="/search/physics?searchtype=author&query=Fiorenza%2C+E">Emiliano Fiorenza</a>, <a href="/search/physics?searchtype=author&query=Chiappini%2C+M">Massimo Chiappini</a>, <a href="/search/physics?searchtype=author&query=Carmisciano%2C+C">Cosmo Carmisciano</a>, <a href="/search/physics?searchtype=author&query=Iafolla%2C+V+A">Valerio Antonio Iafolla</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="2401.04431v1-abstract-short" style="display: inline;"> Sea wave monitoring is key in many applications in oceanography such as the validation of weather and wave models. Conventional in situ solutions are based on moored buoys whose measurements are often recognized as a standard. However, being exposed to a harsh environment, they are not reliable, need frequent maintenance, and the datasets feature many gaps. To overcome the previous limitations, we… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.04431v1-abstract-full').style.display = 'inline'; document.getElementById('2401.04431v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.04431v1-abstract-full" style="display: none;"> Sea wave monitoring is key in many applications in oceanography such as the validation of weather and wave models. Conventional in situ solutions are based on moored buoys whose measurements are often recognized as a standard. However, being exposed to a harsh environment, they are not reliable, need frequent maintenance, and the datasets feature many gaps. To overcome the previous limitations, we propose a system including a buoy, a micro-seismic measuring station, and a machine learning algorithm. The working principle is based on measuring the micro-seismic signals generated by the sea waves. Thus, the machine learning algorithm will be trained to reconstruct the missing buoy data from the micro-seismic data. As the micro-seismic station can be installed indoor, it assures high reliability while the machine learning algorithm provides accurate reconstruction of the missing buoy data. In this work, we present the methods to process the data, develop and train the machine learning algorithm, and assess the reconstruction accuracy. As a case of study, we used experimental data collected in 2014 from the Northern Tyrrhenian Sea demonstrating that the data reconstruction can be done both for significant wave height and wave period. The proposed approach was inspired from Data Science, whose methods were the foundation for the new solutions presented in this work. For example, estimating the period of the sea waves, often not discussed in previous works, was relatively simple with machine learning. In conclusion, the experimental results demonstrated that the new system can overcome the reliability issues of the buoy keeping the same accuracy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.04431v1-abstract-full').style.display = 'none'; document.getElementById('2401.04431v1-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 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Front. Mar. Sci., 17 February 2022, Sec. Ocean Observation, Volume 9 - 2022 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.02166">arXiv:2401.02166</a> <span> [<a href="https://arxiv.org/pdf/2401.02166">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Geophysics">physics.geo-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.measurement.2023.114090">10.1016/j.measurement.2023.114090 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Temperature compensation in high accuracy accelerometers using multi-sensor and machine learning methods </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Iafolla%2C+L">Lorenzo Iafolla</a>, <a href="/search/physics?searchtype=author&query=Santoli%2C+F">Francesco Santoli</a>, <a href="/search/physics?searchtype=author&query=Carluccio%2C+R">Roberto Carluccio</a>, <a href="/search/physics?searchtype=author&query=Chiappini%2C+S">Stefano Chiappini</a>, <a href="/search/physics?searchtype=author&query=Fiorenza%2C+E">Emiliano Fiorenza</a>, <a href="/search/physics?searchtype=author&query=Lefevre%2C+C">Carlo Lefevre</a>, <a href="/search/physics?searchtype=author&query=Loffredo%2C+P">Pasqualino Loffredo</a>, <a href="/search/physics?searchtype=author&query=Lucente%2C+M">Marco Lucente</a>, <a href="/search/physics?searchtype=author&query=Morbidini%2C+A">Alfredo Morbidini</a>, <a href="/search/physics?searchtype=author&query=Pignatelli%2C+A">Alessandro Pignatelli</a>, <a href="/search/physics?searchtype=author&query=Chiappini%2C+M">Massimo Chiappini</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="2401.02166v1-abstract-short" style="display: inline;"> Temperature is a major source of inaccuracy in high-sensitivity accelerometers and gravimeters. Active thermal control systems require power and may not be ideal in some contexts such as airborne or spaceborne applications. We propose a solution that relies on multiple thermometers placed within the accelerometer to measure temperature and thermal gradient variations. Machine Learning algorithms a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.02166v1-abstract-full').style.display = 'inline'; document.getElementById('2401.02166v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.02166v1-abstract-full" style="display: none;"> Temperature is a major source of inaccuracy in high-sensitivity accelerometers and gravimeters. Active thermal control systems require power and may not be ideal in some contexts such as airborne or spaceborne applications. We propose a solution that relies on multiple thermometers placed within the accelerometer to measure temperature and thermal gradient variations. Machine Learning algorithms are used to relate the temperatures to their effect on the accelerometer readings. However, obtaining labeled data for training these algorithms can be difficult. Therefore, we also developed a training platform capable of replicating temperature variations in a laboratory setting. Our experiments revealed that thermal gradients had a significant effect on accelerometer readings, emphasizing the importance of multiple thermometers. The proposed method was experimentally tested and revealed a great potential to be extended to other sources of inaccuracy, such as rotations, as well as to other types of measuring systems, such as magnetometers or gyroscopes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.02166v1-abstract-full').style.display = 'none'; document.getElementById('2401.02166v1-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 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> </li> <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/2006.04149">arXiv:2006.04149</a> <span> [<a href="https://arxiv.org/pdf/2006.04149">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Medical Physics">physics.med-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Image and Video Processing">eess.IV</span> </div> </div> <p class="title is-5 mathjax"> Pipeline for Advanced Contrast Enhancement (PACE) of chest X-ray in evaluating COVID-19 patients by combining bidimensional empirical mode decomposition and CLAHE </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Siracusano%2C+G">Giulio Siracusano</a>, <a href="/search/physics?searchtype=author&query=La+Corte%2C+A">Aurelio La Corte</a>, <a href="/search/physics?searchtype=author&query=Gaeta%2C+M">Michele Gaeta</a>, <a href="/search/physics?searchtype=author&query=Cicero%2C+G">Giuseppe Cicero</a>, <a href="/search/physics?searchtype=author&query=Chiappini%2C+M">Massimo Chiappini</a>, <a href="/search/physics?searchtype=author&query=Finocchio%2C+G">Giovanni Finocchio</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="2006.04149v1-abstract-short" style="display: inline;"> COVID-19 is a new pulmonary disease which is driving stress to the hospitals due to the large number of cases worldwide. Imaging of lungs can play a key role in monitoring of the healthy status. Non-contrast chest computed tomography (CT) has been used for this purpose, mainly in China, with a significant success. However, this approach cannot be used massively mainly for both high risk and cost a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.04149v1-abstract-full').style.display = 'inline'; document.getElementById('2006.04149v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.04149v1-abstract-full" style="display: none;"> COVID-19 is a new pulmonary disease which is driving stress to the hospitals due to the large number of cases worldwide. Imaging of lungs can play a key role in monitoring of the healthy status. Non-contrast chest computed tomography (CT) has been used for this purpose, mainly in China, with a significant success. However, this approach cannot be used massively mainly for both high risk and cost and in some countries also because this tool is not extensively available. Alternatively, chest X-ray, although less sensitive than CT-scan, can provide important information about the evolution of pulmonary involvement during the disease, this aspect is very important to verify the response of a patient to treatments. Here, we show how to improve the sensitivity of chest X-ray via a nonlinear post processing tool, named PACE, combining properly fast and adaptive bidimensional empirical mode decomposition and contrast limited adaptive histogram equalization (CLAHE). The results show an enhancement of the image contrast as confirmed by three widely used metrics: (i) contrast improvement index, (ii) entropy, and (iii) measure of enhancement. This improvement gives rise to a detectability of more lung lesions as identified by two radiologists, which evaluate the images separately, and confirmed by CT-scans. Based on our findings this method is proved as a flexible and effective way for medical image enhancement and can be used as a post-processing step for medical image understanding and analysis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.04149v1-abstract-full').style.display = 'none'; document.getElementById('2006.04149v1-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 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">17 pages, 6 figures, 51 references</span> </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/1812.07953">arXiv:1812.07953</a> <span> [<a href="https://arxiv.org/pdf/1812.07953">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Geophysics">physics.geo-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Applied Physics">physics.app-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.jsv.2019.114929">10.1016/j.jsv.2019.114929 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Nonlinear dispersion relation in anharmonic periodic mass-spring and mass-in-mass systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Zivieri%2C+R">R. Zivieri</a>, <a href="/search/physics?searchtype=author&query=Garesc%C3%AC%2C+F">F. Garesc矛</a>, <a href="/search/physics?searchtype=author&query=Azzerboni%2C+B">B. Azzerboni</a>, <a href="/search/physics?searchtype=author&query=Chiappini%2C+M">M. Chiappini</a>, <a href="/search/physics?searchtype=author&query=Finocchio%2C+G">G. Finocchio</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="1812.07953v1-abstract-short" style="display: inline;"> The study of wave propagation in chains of anharmonic periodic systems is of fundamental importance to understand the response of dynamical absorbers of vibrations and acoustic metamaterials working in nonlinear regime. Here, we derive an analytical nonlinear dispersion relation for periodic chains of anharmonic mass-spring and mass-in-mass systems resulting from considering the hypothesis of weak… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.07953v1-abstract-full').style.display = 'inline'; document.getElementById('1812.07953v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1812.07953v1-abstract-full" style="display: none;"> The study of wave propagation in chains of anharmonic periodic systems is of fundamental importance to understand the response of dynamical absorbers of vibrations and acoustic metamaterials working in nonlinear regime. Here, we derive an analytical nonlinear dispersion relation for periodic chains of anharmonic mass-spring and mass-in-mass systems resulting from considering the hypothesis of weak anharmonic energy and a periodic distribution function as ansatz of a general solution of the nonlinear equations of motion. Numerical simulations show that this expression is valid for anharmonic potential energy up to 50% of the harmonic one. This work provides a simple tool to design and study nonlinear dynamics for a class of seismic metamaterials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1812.07953v1-abstract-full').style.display = 'none'; document.getElementById('1812.07953v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 December, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 5 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/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> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg> <a href="https://info.arxiv.org/help/contact.html"> Contact</a> </li> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>subscribe to arXiv mailings</title><desc>Click here to subscribe</desc><path d="M476 3.2L12.5 270.6c-18.1 10.4-15.8 35.6 2.2 43.2L121 358.4l287.3-253.2c5.5-4.9 13.3 2.6 8.6 8.3L176 407v80.5c0 23.6 28.5 32.9 42.5 15.8L282 426l124.6 52.2c14.2 6 30.4-2.9 33-18.2l72-432C515 7.8 493.3-6.8 476 3.2z"/></svg> <a href="https://info.arxiv.org/help/subscribe"> Subscribe</a> </li> </ul> </div> </div> </div>   <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/license/index.html">Copyright</a></li> <li><a href="https://info.arxiv.org/help/policies/privacy_policy.html">Privacy Policy</a></li> </ul> </div> <div class="column sorry-app-links"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/help/web_accessibility.html">Web Accessibility Assistance</a></li> <li> <p class="help"> <a class="a11y-main-link" href="https://status.arxiv.org" target="_blank">arXiv Operational Status <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 512" class="icon filter-dark_grey" role="presentation"><path d="M224.3 273l-136 136c-9.4 9.4-24.6 9.4-33.9 0l-22.6-22.6c-9.4-9.4-9.4-24.6 0-33.9l96.4-96.4-96.4-96.4c-9.4-9.4-9.4-24.6 0-33.9L54.3 103c9.4-9.4 24.6-9.4 33.9 0l136 136c9.5 9.4 9.5 24.6.1 34z"/></svg></a><br> Get status notifications via <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/email/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 9.2-18.9v-19c0-26.5-21.5-48-48-48H48C21.5 64 0 85.5 0 112v19c0 7.4 3.4 14.3 9.2 18.9 30.6 23.9 40.7 32.4 173.4 128.7 16.8 12.2 50.2 41.8 73.4 41.4z"/></svg>email</a> or <a class="is-link" href="https://subscribe.sorryapp.com/24846f03/slack/new" target="_blank"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" class="icon filter-black" role="presentation"><path d="M94.12 315.1c0 25.9-21.16 47.06-47.06 47.06S0 341 0 315.1c0-25.9 21.16-47.06 47.06-47.06h47.06v47.06zm23.72 0c0-25.9 21.16-47.06 47.06-47.06s47.06 21.16 47.06 47.06v117.84c0 25.9-21.16 47.06-47.06 47.06s-47.06-21.16-47.06-47.06V315.1zm47.06-188.98c-25.9 0-47.06-21.16-47.06-47.06S139 32 164.9 32s47.06 21.16 47.06 47.06v47.06H164.9zm0 23.72c25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06H47.06C21.16 243.96 0 222.8 0 196.9s21.16-47.06 47.06-47.06H164.9zm188.98 47.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06s-21.16 47.06-47.06 47.06h-47.06V196.9zm-23.72 0c0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06V79.06c0-25.9 21.16-47.06 47.06-47.06 25.9 0 47.06 21.16 47.06 47.06V196.9zM283.1 385.88c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06-25.9 0-47.06-21.16-47.06-47.06v-47.06h47.06zm0-23.72c-25.9 0-47.06-21.16-47.06-47.06 0-25.9 21.16-47.06 47.06-47.06h117.84c25.9 0 47.06 21.16 47.06 47.06 0 25.9-21.16 47.06-47.06 47.06H283.1z"/></svg>slack</a> </p> </li> </ul> </div> </div> </div>  </div> </footer> <script src="https://static.arxiv.org/static/base/1.0.0a5/js/member_acknowledgement.js"></script> </body> </html>

CINXE.COM

Search | arXiv e-print repository