CINXE.COM

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">     <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en" xmlns:og="http://ogp.me/ns#" xmlns:fb="http://ogp.me/ns/fb#"> <head> <title>Study of correlation between baseline current and Hit Rate in GE1/1 chambers at the CMS Experiment - CERN Document Server</title> <link href='https://framework.web.cern.ch/framework/2.0/fonts/PTSansWeb/PTSansWeb.css' rel='stylesheet' type='text/css' /> <link rel="stylesheet" href="http://cds.cern.ch/img/invenio.css?v=20141127" type="text/css" /> <link rel="stylesheet" href="http://cds.cern.ch/img/cern_theme/css/cern_theme.css?v=20141127" type="text/css" /> <link rel="stylesheet"href="/css/font-awesome.min.css"> <meta http-equiv="X-UA-Compatible" content="IE=Edge"/> <link rel="stylesheet" href="http://cds.cern.ch/img/cern_toolbar/css/toolbar.css" type="text/css" />    <link rel="canonical" href="http://cds.cern.ch/record/2916757" /> <link rel="alternate" hreflang="el" href="http://cds.cern.ch/record/2916757?ln=el" /> <link rel="alternate" hreflang="fr" href="http://cds.cern.ch/record/2916757?ln=fr" /> <link rel="alternate" hreflang="bg" href="http://cds.cern.ch/record/2916757?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="http://cds.cern.ch/record/2916757?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="http://cds.cern.ch/record/2916757?ln=pt" /> <link rel="alternate" hreflang="no" href="http://cds.cern.ch/record/2916757?ln=no" /> <link rel="alternate" hreflang="hr" href="http://cds.cern.ch/record/2916757?ln=hr" /> <link rel="alternate" hreflang="ca" href="http://cds.cern.ch/record/2916757?ln=ca" /> <link rel="alternate" hreflang="de" href="http://cds.cern.ch/record/2916757?ln=de" /> <link rel="alternate" hreflang="it" href="http://cds.cern.ch/record/2916757?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="http://cds.cern.ch/record/2916757?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="http://cds.cern.ch/record/2916757?ln=sv" /> <link rel="alternate" hreflang="sk" href="http://cds.cern.ch/record/2916757?ln=sk" /> <link rel="alternate" hreflang="en" href="http://cds.cern.ch/record/2916757?ln=en" /> <link rel="alternate" hreflang="pl" href="http://cds.cern.ch/record/2916757?ln=pl" /> <link rel="alternate" hreflang="ru" href="http://cds.cern.ch/record/2916757?ln=ru" /> <link rel="alternate" hreflang="ka" href="http://cds.cern.ch/record/2916757?ln=ka" /> <link rel="alternate" hreflang="ja" href="http://cds.cern.ch/record/2916757?ln=ja" /> <link rel="alternate" hreflang="es" href="http://cds.cern.ch/record/2916757?ln=es" /> <link rel="alternate" type="application/rss+xml" title="CERN Document Server RSS" href="/rss?ln=en" /> <link rel="search" type="application/opensearchdescription+xml" href="http://cds.cern.ch/opensearchdescription" title="CERN Document Server" /> <link rel="unapi-server" type="application/xml" title="unAPI" href="http://cds.cern.ch/unapi" /> <link rel="apple-touch-icon" href="/apple-touch-icon.png"/> <link rel="apple-touch-icon-precomposed" href="/apple-touch-icon-precomposed.png"/> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="en" /> <meta name="description" content="The phase-II upgrade of the CMS Muon System includes the addition of three new Gas Electron Multiplier (GEM) stations --- GE1/1, GE2/1, and ME0 --- to extend the detector's acceptance up to a pseudorapidity of $\lvert \eta \rvert \sim 2.8$. Achieving this requires that the detectors must tolerate the high levels of background radiation expected in the forward endcap regions for the High-Luminosity LHC, with a high rate capability as part of their requirements. The first station, GE1/1, was installed during the Long Shutdown 2 and has been in operation at CMS since Run 3 began in 2022. This study focuses on GE1/1's performance, particularly how the high-radiation environment impacts the High Voltage (HV) system and in turn how this can affect the detector gain stability. This work measures the currents in the HV system of the GE1/1 detectors and correlates them with particle hit-rates observed in the chambers, analyzing these results as a function of the LHC beam luminosity. The findings contribute to assessing GE1/1's rate capability and provide valuable insights for the development and operational planning of the forthcoming GE2/1 and ME0 stations in terms of expected currents at high background hit-rate scenarios. " /> <meta name="keywords" content="Muons" /> <script type="text/javascript" src="http://cds.cern.ch/js/jquery.min.js"></script>  <link rel="stylesheet" href="http://cds.cern.ch/img/webnews.css" type="text/css" />  <script type="text/javascript" src="http://cds.cern.ch/js/webnews.js?v=20131009"></script> <meta property="fb:app_id" content="137353533001720"/> <script type="text/x-mathjax-config"> MathJax.Hub.Config({ tex2jax: {inlineMath: [['$','$']], processEscapes: true}, showProcessingMessages: false, messageStyle: "none" }); </script> <script src="/MathJax/MathJax.js?config=TeX-AMS_CHTML" type="text/javascript"> </script>  <meta content="Study of correlation between baseline current and Hit Rate in GE1/1 chambers at the CMS Experiment" name="citation_title" /> <meta content="2024/11/04" name="citation_publication_date" /> <meta name="citation_online_date" content="2024/11/11"> <meta content="CMS-DP-2024-117" name="citation_technical_report_number" /> <meta content="CERN-CMS-DP-2024-117" name="citation_technical_report_number" /> <meta name="citation_pdf_url" content="http://cds.cern.ch/record/2916757/files/DP2024_117.pdf" />  <meta content="Study of correlation between baseline current and Hit Rate in GE1/1 chambers at the CMS Experiment" property="og:title" /> <meta content="website" property="og:type" /> <meta content="website" property="og:type" /> <meta content="http://cds.cern.ch/record/2916757" property="og:url" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="The phase-II upgrade of the CMS Muon System includes the addition of three new Gas Electron Multiplier (GEM) stations --- GE1/1, GE2/1, and ME0 --- to extend the detector's acceptance up to a pseudorapidity of $\lvert \eta \rvert \sim 2.8$. Achieving this requires that the detectors must tolerate the high levels of background radiation expected in the forward endcap regions for the High-Luminosity LHC, with a high rate capability as part of their requirements. The first station, GE1/1, was installed during the Long Shutdown 2 and has been in operation at CMS since Run 3 began in 2022. This study focuses on GE1/1's performance, particularly how the high-radiation environment impacts the High Voltage (HV) system and in turn how this can affect the detector gain stability. This work measures the currents in the HV system of the GE1/1 detectors and correlates them with particle hit-rates observed in the chambers, analyzing these results as a function of the LHC beam luminosity. The findings contribute to assessing GE1/1's rate capability and provide valuable insights for the development and operational planning of the forthcoming GE2/1 and ME0 stations in terms of expected currents at high background hit-rate scenarios." property="og:description" />  <meta content="summary" name="twitter:card" /> <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="CMS32Preprints search" lang="en">  <div id="cern-toolbar"> <h1><a href="http://cern.ch" title="CERN">CERN <span>Accelerating science</span></a></h1> <ul> <li class="cern-accountlinks"><a class="cern-account" href="https://cds.cern.ch/youraccount/login?ln=en&referer=http%3A//cds.cern.ch/record/2916757" title="Sign in to your CERN account">Sign in</a></li> <li><a class="cern-directory" href="http://cern.ch/directory" title="Search CERN resources and browse the directory">Directory</a></li> </ul> </div>   <div role="banner" class="clearfix" id="header"> <div class="header-inner inner"> <hgroup class="clearfix"> <h2 id="site-name"> <a rel="home" title="Home" href="/"><span>CERN Document Server</span></a> </h2> <h3 id="site-slogan">Access articles, reports and multimedia content in HEP</h3> </hgroup> <div role="navigation" id="main-navigation" class="cdsmenu"> <h2 class="element-invisible">Main menu</h2><ul class="links inline clearfix"> <li class="menu-386 first active-trail"><a class="active-trail" href="http://cds.cern.ch/?ln=en">Search</a></li> <li class="menu-444 "><a class="" title="" href="http://cds.cern.ch/submit?ln=en">Submit</a></li> <li class="menu-426 "><a class="" href="http://cds.cern.ch/help/?ln=en">Help</a></li> <li class="leaf hassubcdsmenu"> <a hreflang="en" class="header" href="https://cds.cern.ch/youraccount/display?ln=en">Personalize</a> <ul class="subsubcdsmenu"><li><a href="https://cds.cern.ch/youralerts/list?ln=en">Your alerts</a></li><li><a href="https://cds.cern.ch/yourbaskets/display?ln=en">Your baskets</a></li><li><a href="https://cds.cern.ch/yourcomments?ln=en">Your comments</a></li><li><a href="https://cds.cern.ch/youralerts/display?ln=en">Your searches</a></li></ul></li> </ul> </div> </div> </div>  <table class="navtrailbox"> <tr> <td class="navtrailboxbody"> <a href="/?ln=en" class="navtrail">Home</a> > <a href="/collection/CMS%20Collection?ln=en" class="navtrail">CMS Collection</a> > <a href="/collection/CMS%20Preprints?ln=en" class="navtrail">CMS Preprints</a> > Study of correlation between baseline current and Hit Rate in GE1/1 chambers at the CMS Experiment </td> </tr> </table> </div> <div class="pagebody"><div class="pagebodystripemiddle"> <div class="detailedrecordbox"> <div class="detailedrecordtabs"> <div> <ul class="detailedrecordtabs"><li class="on first"><a href="/record/2916757/?ln=en">Information </a></li><li class=""><a href="/record/2916757/references?ln=en">References </a></li><li class=""><a href="/record/2916757/comments?ln=en">Discussion (0) </a></li><li class=""><a href="/record/2916757/files?ln=en">Files </a></li></ul> <div id="tabsSpacer" style="clear:both;height:0px"> </div></div> </div> <div class="detailedrecordboxcontent"> <div class="top-left-folded"></div> <div class="top-right-folded"></div> <div class="inside">  <abbr class="unapi-id" title="2916757"></abbr>  <link href="/img/download_and_embed_buttons.css" rel="stylesheet" type="text/css" /> <style type="text/css">  .video_talk_wrapper{ max-width: 640px; min-height: 360px; } </style> <table class="formatRecordTableFullWidth"> <tr> <td class="formatRecordHeader" style="background-image: url('/img/journals.jpg');" colspan="2">  CMS Detector Performance Summaries </td> </tr> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;">CMS-DP-2024-117 ; CERN-CMS-DP-2024-117</td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>Study of correlation between baseline current and Hit Rate in GE1/1 chambers at the CMS Experiment</b></td></tr> <style> .video_control_container, #video_controlbutton { display: none; }#video_detailbox_download {display: none;}#video_detailbox_embed {display: none;}</style> <div class="video_control_container"> <div style="box-sizing: inherit;position: relative;min-height: 1em;margin: 1em 0;background: #f8f8f9;padding: 1em 1.5em;line-height: 1.4285em;transition: opacity .1s ease,color .1s ease,background .1s ease,box-shadow .1s ease,-webkit-box-shadow .1s ease;border-radius: .28571429rem;font-size: 1.1em;margin-top: 0;margin-bottom: 6px;background-color: #f8ffff;color: #276f86;box-shadow: 0 0 0 1px #a9d5de inset,0 0 0 0 transparent;"> <i class="fa fa-info"></i><span style="padding-left: 9px;">If you experience any problem watching the video, click the download button below</span> </div> <a id="video_controlbutton_download" rel="download_button" class="video_controlbutton" href="#">Download</a> <a id="video_controlbutton_embed" class="video_controlbutton" href="#">Embed</a> </div> <div id="video_detailbox_download" style="margin:10px"> </div> <div id="video_detailbox_embed" style="margin:10px"> </div> <tr><td class="formatRecordLabel"> Corporate <span style="white-space:nowrap;">author(s)</span> </td><td style="padding-left:5px;">CMS Collaboration</td></tr> <tr><td class="formatRecordLabel"> Publication </td><td style="padding-left:5px;">2024</td></tr> <tr><td class="formatRecordLabel"> Collaboration </td><td style="padding-left:5px;">CMS Collaboration</td></tr>  <script type="text/javascript"> /* * Changes the Imprint title to Date - Duration as requested by RQF0820114 * This is a hack not to touch the general imprint format element */ $(document).ready(function() { var collections = 'CMS-DETECTOR-PERFORMANCE-SUMMARIES ; NOTE'; if (collections.indexOf('E-LEARNING') > -1) { $('.cern-imprint-label').text('Date - Duration'); } }) </script> <tr><td class="formatRecordLabel cern-imprint-label"> Imprint </td><td style="padding-left:5px;">04 Nov 2024</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">16</td></tr>  <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">Detectors and Experimental Techniques</td></tr> <tr><td class="formatRecordLabel"> Accelerator/Facility, Experiment </td><td style="padding-left:5px;"><a href="http://cds.cern.ch/search?p=CERN%20LHC&f=693__a">CERN LHC</a> ; <a href="http://cds.cern.ch/search?p=CMS&f=693__e">CMS</a></td></tr> <tr><td class="formatRecordLabel"> Keywords </td><td style="padding-left:5px;"><a href="http://cds.cern.ch/search?f=keyword&p=Muons&ln=en">Muons</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The phase-II upgrade of the CMS Muon System includes the addition of three new Gas Electron Multiplier (GEM) stations --- GE1/1, GE2/1, and ME0 --- to extend the detector's acceptance up to a pseudorapidity of $\lvert \eta \rvert \sim 2.8$. Achieving this requires that the detectors must tolerate the high levels of background radiation expected in the forward endcap regions for the High-Luminosity LHC, with a high rate capability as part of their requirements. The first station, GE1/1, was installed during the Long Shutdown 2 and has been in operation at CMS since Run 3 began in 2022. This study focuses on GE1/1's performance, particularly how the high-radiation environment impacts the High Voltage (HV) system and in turn how this can affect the detector gain stability. This work measures the currents in the HV system of the GE1/1 detectors and correlates them with particle hit-rates observed in the chambers, analyzing these results as a function of the LHC beam luminosity. The findings contribute to assessing GE1/1's rate capability and provide valuable insights for the development and operational planning of the forthcoming GE2/1 and ME0 stations in terms of expected currents at high background hit-rate scenarios.</td></tr> </table> <br/><div><div style="clear: both;"> </div></div> <script type="text/javascript"> // Initially hide: $(".longCaption").hide(); // Allow to toggle visibility: $(".toggleLongCaption").toggle(function(){ $(this).siblings(".longCaption").show('fast'); var thisElem = $(this); thisElem.text(thisElem.text() === "more" ? "less" : "more"); },function(){ $(this).siblings(".longCaption").hide('fast'); var thisElem = $(this); thisElem.text(thisElem.text() === "more" ? "less" : "more"); }); </script> <br/><br/><div align="right"><div style="padding-bottom:2px;padding-top:30px;"><span class="moreinfo" style="margin-right:10px;"> <a href="" class="moreinfo">Back to search</a> </span></div></div> <div class="bottom-left-folded"><div class="recordlastmodifiedbox" style="position:relative;margin-left:1px"> Record created 2024-11-11, last modified 2024-11-11</div></div> <div class="bottom-right-folded" style="text-align:right;padding-bottom:2px;"> <span class="moreinfo" style="margin-right:10px;"><a href="/search?ln=en&p=recid%3A2916757&rm=wrd" class="moreinfo">Similar records</a></span></div> </div> </div> </div> <br/> <br /> <div class="detailedrecordminipanel"> <div class="top-left"></div><div class="top-right"></div> <div class="inside"> <div id="detailedrecordminipanelfile" style="width:33%;float:left;text-align:center;margin-top:0"> <div><small class="detailedRecordActions">Fulltext:</small> <br /><a href="/record/2916757/files/DP2024_117.pdf"><img style="border:none" src="/img/file-icon-text-34x48.gif" alt="Download fulltext" /><br />PDF</a><br /></div> </div> <div id="detailedrecordminipanelreview" style="width:30%;float:left;text-align:center"> </div> <div id="detailedrecordminipanelactions" style="width:36%;float:right;text-align:right;"> <ul class="detailedrecordactions"> <li><a href="/yourbaskets/add?ln=en&recid=2916757">Add to personal basket</a></li> <li>Export as <a style="text-decoration:underline;font-weight:normal" href="/record/2916757/export/hx?ln=en">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2916757/export/hm?ln=en">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2916757/export/xm?ln=en">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2916757/export/xd?ln=en">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2916757/export/xe?ln=en">EndNote</a>,  <a style="text-decoration:underline;font-weight:normal" href="/record/2916757/export/xn?ln=en">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2916757/export/xw?ln=en">RefWorks</a> </li> </ul> <div style='padding-left: 13px;'>  <div id="bookmark"></div> <div id="bookmark_sciencewise"></div> <style type="text/css"> #bookmark_sciencewise, #bookmark {float: left;} #bookmark_sciencewise li {padding: 2px; width: 25px;} #bookmark_sciencewise ul, #bookmark ul {list-style-image: none;} </style> <script type="text/javascript" src="/js/jquery.bookmark.min.js"></script> <style type="text/css">@import "/css/jquery.bookmark.css";</style> <script type="text/javascript">// <![CDATA[ $.bookmark.addSite('sciencewise', 'ScienceWise.info', 'http://cds.cern.ch/img/sciencewise.png', 'en', 'bookmark', 'http://sciencewise.info/bookmarks/cds:2916757/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'http://cds.cern.ch/record/2916757', addEmail: true, title: "Study of correlation between baseline current and Hit Rate in GE1/1 chambers at the CMS Experiment", description: "The phase-II upgrade of the CMS Muon System includes the addition of three new Gas Electron Multiplier (GEM) stations --- GE1/1, GE2/1, and ME0 --- to extend the detector\'s acceptance up to a pseudorapidity of $\\lvert \\eta \\rvert \\sim 2.8$. Achieving this requires that the detectors must tolerate the high levels of background radiation expected in the forward endcap regions for the High-Luminosity LHC, with a high rate capability as part of their requirements. \nThe first station, GE1/1, was installed during the Long Shutdown 2 and has been in operation at CMS since Run 3 began in 2022. This study focuses on GE1/1\'s performance, particularly how the high-radiation environment impacts the High Voltage (HV) system and in turn how this can affect the detector gain stability.\nThis work measures the currents in the HV system of the GE1/1 detectors and correlates them with particle hit-rates observed in the chambers, analyzing these results as a function of the LHC beam luminosity. The findings contribute to assessing GE1/1\'s rate capability and provide valuable insights for the development and operational planning of the forthcoming GE2/1 and ME0 stations in terms of expected currents at high background hit-rate scenarios." }); // ]]> </script>  </div> </div> <div style="clear:both;margin-bottom: 0;"></div> </div> <div class="bottom-left"></div><div class="bottom-right"></div> </div> </div></div> <footer id="footer" class="pagefooter clearfix">  <div class="pagefooterstripeleft"> CERN Document Server :: <a class="footer" href="http://cds.cern.ch/?ln=en">Search</a> :: <a class="footer" href="http://cds.cern.ch/submit?ln=en">Submit</a> :: <a class="footer" href="https://cds.cern.ch/youraccount/display?ln=en">Personalize</a> :: <a class="footer" href="http://cds.cern.ch/help/?ln=en">Help</a> :: <a class="footer" href="https://cern.service-now.com/service-portal?id=privacy_policy&se=CDS-Service" target="_blank">Privacy Notice</a> <br /> Powered by <a class="footer" href="http://invenio-software.org/">Invenio</a> <br /> Maintained by <a class="footer" href="https://cern.service-now.com/service-portal?id=service_element&name=CDS-Service">CDS Service</a> - Need help? Contact <a href="https://cern.service-now.com/service-portal?id=service_element&name=CDS-Service">CDS Support</a>. <br /> </div> <div class="pagefooterstriperight"> <div class="cern-logo"> <a id="logo" href="http://cern.ch" title="CERN" rel="CERN" ><img src="http://cds.cern.ch/img/cern_theme/img/cern-logo-large.png" alt="CERN" /></a> </div> <div class="cern-languagebox"> This site is also available in the following languages:<br /><a href="/record/2916757?ln=bg" class="langinfo">Български</a>  <a href="/record/2916757?ln=ca" class="langinfo">Català</a>  <a href="/record/2916757?ln=de" class="langinfo">Deutsch</a>  <a href="/record/2916757?ln=el" class="langinfo">Ελληνικά</a>  <span class="langinfo">English</span>  <a href="/record/2916757?ln=es" class="langinfo">Español</a>  <a href="/record/2916757?ln=fr" class="langinfo">Français</a>  <a href="/record/2916757?ln=hr" class="langinfo">Hrvatski</a>  <a href="/record/2916757?ln=it" class="langinfo">Italiano</a>  <a href="/record/2916757?ln=ja" class="langinfo">日本語</a>  <a href="/record/2916757?ln=ka" class="langinfo">ქართული</a>  <a href="/record/2916757?ln=no" class="langinfo">Norsk/Bokmål</a>  <a href="/record/2916757?ln=pl" class="langinfo">Polski</a>  <a href="/record/2916757?ln=pt" class="langinfo">Português</a>  <a href="/record/2916757?ln=ru" class="langinfo">Русский</a>  <a href="/record/2916757?ln=sk" class="langinfo">Slovensky</a>  <a href="/record/2916757?ln=sv" class="langinfo">Svenska</a>  <a href="/record/2916757?ln=zh_CN" class="langinfo">中文(简)</a>  <a href="/record/2916757?ln=zh_TW" class="langinfo">中文(繁)</a> </div> </div>  </footer> <script type="text/javascript"> var SyndeticsBookCovers = (function() { var SMALL_SIZE = "sc.gif", MEDIUM_SIZE = "mc.gif", RAW_URL = "https://secure.syndetics.com/index.aspx?isbn=THEISBN/THESIZE&client=cernlibrary"; replaceCover = function(imgElement, isbns, hdFormat) { var img = new Image(), size = hdFormat ? MEDIUM_SIZE : SMALL_SIZE; var _isbns = isbns.sort(function(a, b) { // sort from shortest to longest ISBN (more modern) return a.length > b.length ? 1 : -1; }); function next() { var isbn = _isbns.pop(); if (isbn) { var url = RAW_URL.replace("THEISBN", isbn).replace("THESIZE", size); img.src = url; } } function done() { imgElement.src = img.src; } img.onload = function() { if (this.width > 1) { done(); } else { next(); } }; next(); }; return { replaceCover: replaceCover }; })(); $(document).ready(function() { // get book covers $("img.book-cover").each(function() { var $this = $(this), strIsbns = $this.data("isbns") || "", isbnsArray = String(strIsbns).split(","), hdFormat = $this.hasClass("hd"); SyndeticsBookCovers.replaceCover(this, isbnsArray, hdFormat); }); // WebNews tooltips $.ajax({ url: "/news/tooltips", success: function(data) { create_tooltips(data); }, dataType: "json", cache: false }); }); </script>  <script src="//cds.cern.ch/js/feedback.js"></script>   <script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="https://webanalytics.web.cern.ch/"; _paq.push(['setTrackerUrl', u+'matomo.php']); _paq.push(['setSiteId', '756']); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s); })(); </script>  </body> </html>