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Two channels are considered: the production of top quark-antiquark pair with one top decaying via FCNC, and the associated production of a top quark and Higgs boson. Final states contain either two same-charge leptons, or three leptons of which two have the same charge. Observed (expected) upper limits on the branching rations are determined as $\mathcal{B}(t\to Hu)<2.8\,(3.0) \times 10^{-4}$ and $\mathcal{B}(t\to Hc)<3.3\,(3.8) \times 10^{-4}$. Wahdan, Shayma" /> <meta name="keywords" content="CERN Document Server, WebSearch, ATLAS Preprints" /> <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="arXiv : Search for flavour-changing neutral current couplings between the top quark and the Higgs boson in multilepton final states with the ATLAS detector" name="citation_title" /> <meta content="Wahdan, Shayma" name="citation_author" /> <meta content="2024/11/21" name="citation_publication_date" /> <meta name="citation_online_date" content="2024/11/23"> <meta content="arXiv:2411.14026" name="citation_technical_report_number" /> <meta name="citation_pdf_url" content="https://cds.cern.ch/record/2917835/files/2411.14026.pdf" />  <meta content="Search for flavour-changing neutral current couplings between the top quark and the Higgs boson in multilepton final states with the ATLAS detector" property="og:title" /> <meta content="arXiv" property="og:title" /> <meta content="website" property="og:type" /> <meta content="website" property="og:type" /> <meta content="https://cds.cern.ch/record/2917835" property="og:url" /> <meta name="twitter:image" content="https://cds.cern.ch/record/2917835/files/fig_09b.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2917835/files/fig_09b.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2917835/files/fig_09b.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2917835/files/fig_09a.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2917835/files/fig_09a.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2917835/files/fig_07b.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2917835/files/fig_07b.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2917835/files/fig_04a.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2917835/files/fig_04a.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2917835/files/fig_05a.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2917835/files/fig_05a.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2917835/files/bandeau_TP2024.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2917835/files/bandeau_TP2024.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2917835/files/fig_01a.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2917835/files/fig_01a.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2917835/files/fig_08.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2917835/files/fig_08.png" /> <meta property="og:image" content="https://cds.cern.ch/record/2917835/files/fig_02b.png" /> <meta property="og:image:secure_url" content="https://cds.cern.ch/record/2917835/files/fig_02b.png" /> <meta content="CERN Document Server" property="og:site_name" /> <meta content="arXiv" property="og:description" /> <meta content="These proceedings present a search for flavour-changing neutral-current (FCNC) interaction involving the top quark, Higgs boson and either the up or the charm quark, using 140 fb$^{-1}$ of 13 TeV proton--proton collision data from the ATLAS detector at the Large Hadron Collider. Two channels are considered: the production of top quark-antiquark pair with one top decaying via FCNC, and the associated production of a top quark and Higgs boson. Final states contain either two same-charge leptons, or three leptons of which two have the same charge. Observed (expected) upper limits on the branching rations are determined as $\mathcal{B}(t\to Hu)&lt;2.8\,(3.0) \times 10^{-4}$ and $\mathcal{B}(t\to Hc)&lt;3.3\,(3.8) \times 10^{-4}$." property="og:description" />  <meta content="summary" name="twitter:card" /> <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="ATLAS32Preprints 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/2917835" 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/CERN%20Experiments?ln=en" class="navtrail">CERN Experiments</a> > <a href="/collection/LHC%20Experiments?ln=en" class="navtrail">LHC Experiments</a> > <a href="/collection/ATLAS?ln=en" class="navtrail">ATLAS</a> > <a href="/collection/ATLAS%20Preprints?ln=en" class="navtrail">ATLAS Preprints</a> > Search for flavour-changing neutral current couplings between the top quark and the Higgs boson in multilepton final states with the ATLAS detector </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/2917835/?ln=en">Information </a></li><li class=""><a href="/record/2917835/comments?ln=en">Discussion (0) </a></li><li class=""><a href="/record/2917835/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="2917835"></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">  Preprint </td> </tr> <tr><td class="formatRecordLabel"> Report number </td><td style="padding-left:5px;"><a href="http://arxiv.org/abs/arXiv:2411.14026">arXiv:2411.14026</a></td></tr> <tr><td class="formatRecordLabel"> Title </td><td style="padding-left:5px;"><b>Search for flavour-changing neutral current couplings between the top quark and the Higgs boson in multilepton final states with the ATLAS detector</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=Wahdan%2C%20Shayma&ln=en">Wahdan, Shayma</a> (Wuppertal U.)</td></tr> <tr><td class="formatRecordLabel"> Collaboration </td><td style="padding-left:5px;">ATLAS Collaboration</td></tr> <tr><td class="formatRecordLabel"> Document contact </td><td style="padding-left:5px;"><span style="">Contact: </span>arXiv</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 = 'ConferencePaper ; PREPRINT'; if (collections.indexOf('E-LEARNING') > -1) { $('.cern-imprint-label').text('Date - Duration'); } }) </script> <tr><td class="formatRecordLabel cern-imprint-label"> Imprint </td><td style="padding-left:5px;">2024-11-21</td></tr>  <tr><td class="formatRecordLabel"> Note </td><td style="padding-left:5px;">Talk at the 17th International Workshop on Top Quark Physics (Top2024), 22-27 September 2024</td></tr> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">hep-ex ; Particle Physics - Experiment</td></tr> <tr><td class="formatRecordLabel"> Accelerator/Facility, Experiment </td><td style="padding-left:5px;"><a href="https://cds.cern.ch/search?p=CERN%20LHC&f=693__a">CERN LHC</a> ; <a href="https://cds.cern.ch/search?p=ATLAS&f=693__e">ATLAS</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">These proceedings present a search for flavour-changing neutral-current (FCNC) interaction involving the top quark, Higgs boson and either the up or the charm quark, using 140 fb$^{-1}$ of 13 TeV proton--proton collision data from the ATLAS detector at the Large Hadron Collider. Two channels are considered: the production of top quark-antiquark pair with one top decaying via FCNC, and the associated production of a top quark and Higgs boson. Final states contain either two same-charge leptons, or three leptons of which two have the same charge. Observed (expected) upper limits on the branching rations are determined as $\mathcal{B}(t\to Hu)<2.8\,(3.0) \times 10^{-4}$ and $\mathcal{B}(t\to Hc)<3.3\,(3.8) \times 10^{-4}$.</td></tr> <tr><td class="formatRecordLabel"> Other source </td><td style="padding-left:5px;"><a href="http://inspirehep.net/record/2850921">Inspire</a></td></tr> <tr><td class="formatRecordLabel"> Copyright/License </td><td style="padding-left:5px;">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/2917835/plots#0"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2917835/files/bandeau_TP2024.png" title=" \noindent#1" width="200px"/></a> <a href="/record/2917835/plots#1"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2917835/files/fig_01a.png" title=" Example Feynman diagrams of the signal process: (a) $t\bar{t}(t\to Hq)$ decay resulting in the $2\Pl SS$ final state, and (b) $gq\to Ht$ production signal process resulting in the $3\Pl$ final state." width="200px"/></a> <a href="/record/2917835/plots#2"><img style="vertical-align:middle;" src="https://cds.cern.ch/record/2917835/files/fig_02b.png" title=" Example Feynman diagrams of the signal process: (a) $t\bar{t}(t\to Hq)$ decay resulting in the $2\Pl SS$ final state, and (b) $gq\to Ht$ production signal process resulting in the $3\Pl$ final state." width="200px"/></a> <a href='/record/2917835/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" ? 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Two channels are considered: the production of top quark-antiquark pair with one top decaying via FCNC, and the associated production of a top quark and Higgs boson. Final states contain either two same-charge leptons, or three leptons of which two have the same charge. Observed (expected) upper limits on the branching rations are determined as $\\mathcal{B}(t\\to Hu)<2.8\\,(3.0) \\times 10^{-4}$ and $\\mathcal{B}(t\\to Hc)<3.3\\,(3.8) \\times 10^{-4}$." }); // ]]> </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="https://cds.cern.ch/?ln=en">Search</a> :: <a class="footer" href="https://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="https://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? 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