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<!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>Reconstructing jets in the Phase-2 upgrade of the CMS Level-1 Trigger with a seeded cone algorithm - 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="https://cds.cern.ch/img/invenio.css?v=20141127" type="text/css" /> <link rel="stylesheet" href="https://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="https://cds.cern.ch/img/cern_toolbar/css/toolbar.css" type="text/css" />    <link rel="canonical" href="https://cds.cern.ch/record/2872269" /> <link rel="alternate" hreflang="el" href="https://cds.cern.ch/record/2872269?ln=el" /> <link rel="alternate" hreflang="fr" href="https://cds.cern.ch/record/2872269?ln=fr" /> <link rel="alternate" hreflang="bg" href="https://cds.cern.ch/record/2872269?ln=bg" /> <link rel="alternate" hreflang="zh-TW" href="https://cds.cern.ch/record/2872269?ln=zh_TW" /> <link rel="alternate" hreflang="pt" href="https://cds.cern.ch/record/2872269?ln=pt" /> <link rel="alternate" hreflang="no" href="https://cds.cern.ch/record/2872269?ln=no" /> <link rel="alternate" hreflang="hr" href="https://cds.cern.ch/record/2872269?ln=hr" /> <link rel="alternate" hreflang="ca" href="https://cds.cern.ch/record/2872269?ln=ca" /> <link rel="alternate" hreflang="de" href="https://cds.cern.ch/record/2872269?ln=de" /> <link rel="alternate" hreflang="it" href="https://cds.cern.ch/record/2872269?ln=it" /> <link rel="alternate" hreflang="zh-CN" href="https://cds.cern.ch/record/2872269?ln=zh_CN" /> <link rel="alternate" hreflang="sv" href="https://cds.cern.ch/record/2872269?ln=sv" /> <link rel="alternate" hreflang="sk" href="https://cds.cern.ch/record/2872269?ln=sk" /> <link rel="alternate" hreflang="en" href="https://cds.cern.ch/record/2872269?ln=en" /> <link rel="alternate" hreflang="pl" href="https://cds.cern.ch/record/2872269?ln=pl" /> <link rel="alternate" hreflang="ru" href="https://cds.cern.ch/record/2872269?ln=ru" /> <link rel="alternate" hreflang="ka" href="https://cds.cern.ch/record/2872269?ln=ka" /> <link rel="alternate" hreflang="ja" href="https://cds.cern.ch/record/2872269?ln=ja" /> <link rel="alternate" hreflang="es" href="https://cds.cern.ch/record/2872269?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="https://cds.cern.ch/opensearchdescription" title="CERN Document Server" /> <link rel="unapi-server" type="application/xml" title="unAPI" href="https://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-2 Upgrade of the CMS Level-1 Trigger (L1T) will reconstruct particles using the Particle Flow algorithm, connecting information from the tracker, muon, and calorimeter detectors, and enabling fine-grained reconstruction of high level physics objects like jets. We have developed a jet reconstruction algorithm using a cone centred on an energetic seed from these Particle Flow candidates. The implementation is designed to find up to 16 jets in each Xilinx Ultrascale+ FPGA, with a latency of less than 1 $\mu$s, and event throughput of 6.7 MHz to fit within the L1T system constraints. Pipelined processing enables reconstruction of jet collections with different cone sizes for little additional resource cost. The design of the algorithm also provides a platform for additional computation using the jet constituents, such as jet tagging using neural networks. In this talk we will describe the implementation, its jet reconstruction performance, computational metrics, and the developments towards jet tagging. The Phase-2 Upgrade of the CMS Level-1 Trigger (L1T) will reconstruct particles using the Particle Flow algorithm, connecting information from the tracker, muon, and calorimeter detectors, and enabling fine-grained reconstruction of high level physics objects like jets. We have developed a jet reconstruction algorithm using a cone centred on an energetic seed from these Particle Flow candidates. The implementation is designed to find up to 16 jets in each Xilinx Ultrascale+ FPGA, with a latency of less than 1 µs, and event throughput of 6.7 MHz to fit within the L1T system constraints. Pipelined processing enables reconstruction of jet collections with different cone sizes for little additional resource cost. The design of the algorithm also provides a platform for additional computation using the jet constituents, such as jet tagging using neural networks. We will describe the implementation, its jet reconstruction performance, computational metrics, and the developments towards jet tagging. The Phase-2 Upgrade of the CMS Level-1 Trigger (L1T) will reconstruct particles using the Particle Flow algorithm, connecting information from the tracker, muon, and calorimeter detectors, and enabling fine-grained reconstruction of high level physics objects like jets. We have developed a jet reconstruction algorithm using a cone centred on an energetic seed from these Particle Flow candidates. The implementation is designed to find up to 16 jets in each Xilinx Ultrascale+ FPGA, with a latency of less than 1 μs, and event throughput of 6.7 MHz to fit within the L1T system constraints. Pipelined processing enables reconstruction of jet collections with different cone sizes for little additional resource cost. The design of the algorithm also provides a platform for additional computation using the jet constituents, such as jet tagging using neural networks. We will describe the implementation, its jet reconstruction performance, computational metrics, and the developments towards jet tagging. Summers, Sioni; Bestintzanos, Ioannis; Petrucciani, Giovanni" /> <meta name="keywords" content="Trigger" /> <script type="text/javascript" src="https://cds.cern.ch/js/jquery.min.js"></script>  <link rel="stylesheet" href="https://cds.cern.ch/img/webnews.css" type="text/css" />  <script type="text/javascript" src="https://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="EDP Sciences : Reconstructing jets in the Phase-2 upgrade of the CMS Level-1 Trigger with a seeded cone algorithm" name="citation_title" /> <meta content="Summers, Sioni" name="citation_author" /> <meta content="Bestintzanos, Ioannis" name="citation_author" /> <meta content="Petrucciani, Giovanni" name="citation_author" /> <meta content="10.1051/epjconf/202429502024" name="citation_doi" /> <meta content="EPJ Web Conf." name="citation_journal_title" /> <meta content="295" name="citation_volume" /> <meta content="02024" name="citation_firstpage" /> <meta content="2023/08/16" name="citation_publication_date" /> <meta name="citation_online_date" content="2023/09/25"> <meta content="arXiv:2310.08062" name="citation_technical_report_number" /> <meta content="CMS-CR-2023-118" name="citation_technical_report_number" /> <meta content="10.1051/epjconf/202429502024" name="citation_doi" /> <meta name="citation_pdf_url" content="https://cds.cern.ch/record/2872269/files/CR2023_118.pdf" /> <meta name="citation_pdf_url" content="https://cds.cern.ch/record/2872269/files/2310.08062.pdf" /> <meta name="citation_pdf_url" content="https://cds.cern.ch/record/2872269/files/document.pdf" />  <meta content="Reconstructing jets in the Phase-2 upgrade of the CMS Level-1 Trigger with a seeded cone algorithm" property="og:title" /> <meta content="EDP Sciences" property="og:title" /> <meta content="website" property="og:type" /> <meta content="website" property="og:type" /> <meta content="website" property="og:type" /> <meta content="https://cds.cern.ch/record/2872269" property="og:url" /> <meta name="twitter:image" content="https://cds.cern.ch/record/2872269/files/qcd_effi_threshs.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2872269/files/qcd_effi_threshs.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2872269/files/qcd_effi_threshs.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2872269/files/qcd_effi_70kHz.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2872269/files/qcd_effi_70kHz.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2872269/files/ttbar_scakmatch.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2872269/files/ttbar_scakmatch.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2872269/files/qcd_scakmatch.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2872269/files/qcd_scakmatch.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2872269/files/scj_timeline.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2872269/files/scj_timeline.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2872269/files/minbias_rate_sc4ak4.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2872269/files/minbias_rate_sc4ak4.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2872269/files/ttbar_effi_70kHz.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2872269/files/ttbar_effi_70kHz.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2872269/files/ttbar_effi_threshs.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2872269/files/ttbar_effi_threshs.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2872269/files/deregionizer_truncation.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2872269/files/deregionizer_truncation.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2872269/files/scj_floorplan.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2872269/files/scj_floorplan.png" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="The Phase-2 Upgrade of the CMS Level-1 Trigger (L1T) will reconstruct particles using the Particle Flow algorithm, connecting information from the tracker, muon, and calorimeter detectors, and enabling fine-grained reconstruction of high level physics objects like jets. We have developed a jet reconstruction algorithm using a cone centred on an energetic seed from these Particle Flow candidates. The implementation is designed to find up to 16 jets in each Xilinx Ultrascale+ FPGA, with a latency of less than 1 $\mu$s, and event throughput of 6.7 MHz to fit within the L1T system constraints. Pipelined processing enables reconstruction of jet collections with different cone sizes for little additional resource cost. The design of the algorithm also provides a platform for additional computation using the jet constituents, such as jet tagging using neural networks. In this talk we will describe the implementation, its jet reconstruction performance, computational metrics, and the developments towards jet tagging." property="og:description" /> <meta content="The Phase-2 Upgrade of the CMS Level-1 Trigger (L1T) will reconstruct particles using the Particle Flow algorithm, connecting information from the tracker, muon, and calorimeter detectors, and enabling fine-grained reconstruction of high level physics objects like jets. We have developed a jet reconstruction algorithm using a cone centred on an energetic seed from these Particle Flow candidates. The implementation is designed to find up to 16 jets in each Xilinx Ultrascale+ FPGA, with a latency of less than 1 μs, and event throughput of 6.7 MHz to fit within the L1T system constraints. Pipelined processing enables reconstruction of jet collections with different cone sizes for little additional resource cost. The design of the algorithm also provides a platform for additional computation using the jet constituents, such as jet tagging using neural networks. We will describe the implementation, its jet reconstruction performance, computational metrics, and the developments towards jet tagging." property="og:description" /> <meta content="arXiv" property="og:description" /> <meta content="The Phase-2 Upgrade of the CMS Level-1 Trigger (L1T) will reconstruct particles using the Particle Flow algorithm, connecting information from the tracker, muon, and calorimeter detectors, and enabling fine-grained reconstruction of high level physics objects like jets. We have developed a jet reconstruction algorithm using a cone centred on an energetic seed from these Particle Flow candidates. The implementation is designed to find up to 16 jets in each Xilinx Ultrascale+ FPGA, with a latency of less than 1 µs, and event throughput of 6.7 MHz to fit within the L1T system constraints. Pipelined processing enables reconstruction of jet collections with different cone sizes for little additional resource cost. The design of the algorithm also provides a platform for additional computation using the jet constituents, such as jet tagging using neural networks. We will describe the implementation, its jet reconstruction performance, computational metrics, and the developments towards jet tagging." property="og:description" /> <meta content="EDP Sciences" property="og:description" />  <meta content="summary" name="twitter:card" /> <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=https%3A//cds.cern.ch/record/2872269%3Fln%3Den" 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="https://cds.cern.ch/?ln=en">Search</a></li> <li class="menu-444 "><a class="" title="" href="https://cds.cern.ch/submit?ln=en">Submit</a></li> <li class="menu-426 "><a class="" href="https://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> > Reconstructing jets in the Phase-2 upgrade of the CMS Level-1 Trigger with a seeded cone algorithm </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/2872269/?ln=en">Information </a></li><li class=""><a href="/record/2872269/references?ln=en">References </a></li><li class=""><a href="/record/2872269/comments?ln=en">Discussion (0) </a></li><li class=""><a href="/record/2872269/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="2872269"></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 Note </td> </tr> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;"><a href="http://arxiv.org/abs/arXiv:2310.08062">arXiv:2310.08062</a> ; CMS-CR-2023-118</td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>Reconstructing jets in the Phase-2 upgrade of the CMS Level-1 Trigger with a seeded cone algorithm</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"> <span style="white-space:nowrap;">Author(s)</span> </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?f=author&p=Summers%2C%20Sioni&ln=en">Summers, Sioni</a> (CERN) ; <a href="https://cds.cern.ch/search?f=author&p=Bestintzanos%2C%20Ioannis&ln=en">Bestintzanos, Ioannis</a> (CERN ; Ioannina U.) ; <a href="https://cds.cern.ch/search?f=author&p=Petrucciani%2C%20Giovanni&ln=en">Petrucciani, Giovanni</a> (CERN)</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 = 'INTNOTECMSPUBL ; ConferencePaper ; ARTICLE'; 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;">16 Aug 2023</td></tr> <tr><td class="formatRecordLabel"> Number of pages </td><td style="padding-left:5px;">8</td></tr>  <tr><td class="formatRecordLabel"> Published in: </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.1051/epjconf/202429502024"><i>EPJ Web Conf.</i> 295 (2024) 02024</a> </a></td></tr> <tr><td class="formatRecordLabel"> Presented at </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/record/2853081">26th International Conference on Computing in High Energy & Nuclear Physics</a>, Norfolk, Virginia, Us, 8 - 12 May 2023, pp.02024</td></tr> <tr><td class="formatRecordLabel"> DOI </td><td style="padding-left:5px;"><a href="http://dx.doi.org/10.1051/epjconf/202429502024" title="DOI" target="_blank">10.1051/epjconf/202429502024</a> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">Detectors and Experimental Techniques ; Particle Physics - Experiment</td></tr> <tr><td class="formatRecordLabel"> Accelerator/Facility, Experiment </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?p=CERN%20LHC&f=693__a">CERN LHC</a> ; <a href="https://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="https://cds.cern.ch/search?f=keyword&p=Trigger&ln=en">Trigger</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The Phase-2 Upgrade of the CMS Level-1 Trigger (L1T) will reconstruct particles using the Particle Flow algorithm, connecting information from the tracker, muon, and calorimeter detectors, and enabling fine-grained reconstruction of high level physics objects like jets. We have developed a jet reconstruction algorithm using a cone centred on an energetic seed from these Particle Flow candidates. The implementation is designed to find up to 16 jets in each Xilinx Ultrascale+ FPGA, with a latency of less than 1 $\mu$s, and event throughput of 6.7 MHz to fit within the L1T system constraints. Pipelined processing enables reconstruction of jet collections with different cone sizes for little additional resource cost. The design of the algorithm also provides a platform for additional computation using the jet constituents, such as jet tagging using neural networks. In this talk we will describe the implementation, its jet reconstruction performance, computational metrics, and the developments towards jet tagging.</td></tr> <tr><td class="formatRecordLabel"> Other source </td><td style="padding-left:5px;"><a href="http://inspirehep.net/record/2709838">Inspire</a></td></tr> <tr><td class="formatRecordLabel"> Copyright/License </td><td style="padding-left:5px;">publication: © 2024 The Authors (License: <a href="https://creativecommons.org/licenses/by/4.0/">CC-BY-4.0</a>)<br/>preprint: (License: <a href="http://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a>)</td></tr> </table> <br /><div style="max-width:1024px;margin:auto"><div style="overflow-x:auto;display:inline;width:100%;"><a href="/record/2872269/plots#0"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2872269/files/deregionizer_truncation.png" title=" Distributions of multiplicity of L1 PUPPI particles in different simulated signal samples. The dashed line shows the deregionizer module limit, after which particles are truncated." width="200px"/></a> <a href="/record/2872269/plots#1"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2872269/files/scj_timeline.png" title=" Processing timeline of one event, showing concurrent execution of tasks. The tasks contributing to the latency critical path are grouped along the top row." width="200px"/></a> <a href="/record/2872269/plots#2"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2872269/files/scj_floorplan.png" title=" Floorplan of the Seeded Cone Jet algorithm in a VU9P FPGA." width="200px"/></a> <a href='/record/2872269/plots'>Show more plots</a></div></div><br /> <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" ? 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