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Search for new physics with one Higgs boson in the $b\bar{b}\gamma \gamma$ channel with the ATLAS detector - CERN Document Server

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The Higgs boson discovery in 2012 at the Large Hadron Collider (LHC) at CERN marked a remarkable success of its predictive power even if the SM has shortcomings. Since then, the Higgs boson and the Higgs mechanism have been thoroughly studied in the hope to find a hint for new physics. These researches are made possible by high quality experimental infrastructures like the LHC and the ATLAS detector. Its current Inner Detector will be replaced by the brand new Inner Tracker to maintain a high level of tracking and object reconstruction performance in the harsher environment of High-Luminosity LHC (HL-LHC). This thesis presents the adaptation of a neural network based flavour tagging algorithm in the HL-LHC configuration. The track selection used in the training and the resampling method have notably been optimised. A research for new scalar particles in the Higgs sector $X$ and $S$ in the $X\to SH\to b\bar{b}\gamma\gamma$ channel is also presented. The analysis is performed using 140~fb$^{-1}$ of ATLAS Run~2 data at $\sqrt{s}=13$~TeV. Parameterised Neural Networks (PNNs) are used to probe a large range of masses $m_X$ and $m_S$. Results show a local (global) excess of 3.55$\sigma$ (2.0) with respect to the background only hypothesis. 95\% CL upper limits between 0.09 and 39~fb are set on the signal production cross section $X\to SH$ in the $b\bar{b}\gamma\gamma$ final state. 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The Higgs boson discovery in 2012 at the Large Hadron Collider (LHC) at CERN marked a remarkable success of its predictive power even if the SM has shortcomings. Since then, the Higgs boson and the Higgs mechanism have been thoroughly studied in the hope to find a hint for new physics. These researches are made possible by high quality experimental infrastructures like the LHC and the ATLAS detector. Its current Inner Detector will be replaced by the brand new Inner Tracker to maintain a high level of tracking and object reconstruction performance in the harsher environment of High-Luminosity LHC (HL-LHC). This thesis presents the adaptation of a neural network based flavour tagging algorithm in the HL-LHC configuration. The track selection used in the training and the resampling method have notably been optimised. A research for new scalar particles in the Higgs sector $X$ and $S$ in the $X\to SH\to b\bar{b}\gamma\gamma$ channel is also presented. The analysis is performed using 140~fb$^{-1}$ of ATLAS Run~2 data at $\sqrt{s}=13$~TeV. Parameterised Neural Networks (PNNs) are used to probe a large range of masses $m_X$ and $m_S$. Results show a local (global) excess of 3.55$\sigma$ (2.0) with respect to the background only hypothesis. 95\% CL upper limits between 0.09 and 39~fb are set on the signal production cross section $X\to SH$ in the $b\bar{b}\gamma\gamma$ final state." property="og:description" /> <!-- Twitter Card --> <meta content="summary" name="twitter:card" /> <style></style> </head> <body class="ATLAS32Preprints search" lang="en"> <!-- toolbar starts --> <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&amp;referer=https%3A//cds.cern.ch/record/2916571" 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> <!-- toolbar ends --> <!-- Nav header starts--> <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><!-- /#name-and-slogan --> <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> <!-- Nav header ends--> <table class="navtrailbox"> <tr> <td class="navtrailboxbody"> <a href="/?ln=en" class="navtrail">Home</a> &gt; 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<a href="/search?f=author&amp;p=Petit, Elisabeth">Petit, Elisabeth</a></td></tr> <tr><td class="formatRecordLabel"> Note </td><td style="padding-left:5px;">Presented 30 Sep 2024</td></tr> <tr><td class="formatRecordLabel"> Subject category </td><td style="padding-left:5px;">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&amp;f=693__a">CERN LHC</a> ; <a href="https://cds.cern.ch/search?p=ATLAS&amp;f=693__e">ATLAS</a></td></tr> <tr><td class="formatRecordLabel"> Abstract </td><td style="padding-left:5px;">The Standard Model (SM) is the current theory that describes the elementary particles and their interactions. The Higgs boson discovery in 2012 at the Large Hadron Collider (LHC) at CERN marked a remarkable success of its predictive power even if the SM has shortcomings. Since then, the Higgs boson and the Higgs mechanism have been thoroughly studied in the hope to find a hint for new physics. These researches are made possible by high quality experimental infrastructures like the LHC and the ATLAS detector. Its current Inner Detector will be replaced by the brand new Inner Tracker to maintain a high level of tracking and object reconstruction performance in the harsher environment of High-Luminosity LHC (HL-LHC). This thesis presents the adaptation of a neural network based flavour tagging algorithm in the HL-LHC configuration. The track selection used in the training and the resampling method have notably been optimised. A research for new scalar particles in the Higgs sector $X$ and $S$ in the $X\to SH\to b\bar{b}\gamma\gamma$ channel is also presented. The analysis is performed using 140~fb$^{-1}$ of ATLAS Run~2 data at $\sqrt{s}=13$~TeV. Parameterised Neural Networks (PNNs) are used to probe a large range of masses $m_X$ and $m_S$. Results show a local (global) excess of 3.55$\sigma$ (2.0) with respect to the background only hypothesis. 95\% CL upper limits between 0.09 and 39~fb are set on the signal production cross section $X\to SH$ in the $b\bar{b}\gamma\gamma$ final state.</td></tr> </table> <br/>Email contact: <a href="mailto:fernoux@cppm.in2p3.fr">fernoux@cppm.in2p3.fr</a> <small> </small> <small> </small> <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">&nbsp;Record created 2024-11-08, last modified 2024-12-18</div></div> <div class="bottom-right-folded" style="text-align:right;padding-bottom:2px;"> <span class="moreinfo" style="margin-right:10px;"></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/2916571/files/CERN-THESIS-2024-226.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&amp;recid=2916571">Add to personal basket</a></li> <li>Export as <a style="text-decoration:underline;font-weight:normal" href="/record/2916571/export/hx?ln=en">BibTeX</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2916571/export/hm?ln=en">MARC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2916571/export/xm?ln=en">MARCXML</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2916571/export/xd?ln=en">DC</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2916571/export/xe?ln=en">EndNote</a>, <!-- <a style="text-decoration:underline;font-weight:normal" href="/record/2916571/export/xe8x?ln=en">EndNote (8-X)</a>,--> <a style="text-decoration:underline;font-weight:normal" href="/record/2916571/export/xn?ln=en">NLM</a>, <a style="text-decoration:underline;font-weight:normal" href="/record/2916571/export/xw?ln=en">RefWorks</a> </li> </ul> <div style='padding-left: 13px;'> <!-- JQuery Bookmark Button BEGIN --> <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', 'https://cds.cern.ch/img/sciencewise.png', 'en', 'bookmark', 'http://sciencewise.info/bookmarks/cds:2916571/add'); $('#bookmark_sciencewise').bookmark({sites: ['sciencewise']}); $('#bookmark').bookmark({ sites: ['facebook', 'twitter', 'linkedin', 'google_plusone'], icons: '/img/bookmarks.png', url: 'https://cds.cern.ch/record/2916571', addEmail: true, title: "Search for new physics with one Higgs boson in the $b\\bar{b}\\gamma \\gamma$ channel with the ATLAS detector", description: "The Standard Model (SM) is the current theory that describes the elementary particles and their interactions. The Higgs boson discovery in 2012 at the Large Hadron Collider (LHC) at CERN marked a remarkable success of its predictive power even if the SM has shortcomings. Since then, the Higgs boson and the Higgs mechanism have been thoroughly studied in the hope to find a hint for new physics. These researches are made possible by high quality experimental infrastructures like the LHC and the ATLAS detector. Its current Inner Detector will be replaced by the brand new Inner Tracker to maintain a high level of tracking and object reconstruction performance in the harsher environment of High-Luminosity LHC (HL-LHC). This thesis presents the adaptation of a neural network based flavour tagging algorithm in the HL-LHC configuration. The track selection used in the training and the resampling method have notably been optimised. A research for new scalar particles in the Higgs sector $X$ and $S$ in the $X\\to SH\\to b\\bar{b}\\gamma\\gamma$ channel is also presented. The analysis is performed using 140~fb$^{-1}$ of ATLAS Run~2 data at $\\sqrt{s}=13$~TeV. Parameterised Neural Networks (PNNs) are used to probe a large range of masses $m_X$ and $m_S$. Results show a local (global) excess of 3.55$\\sigma$ (2.0) with respect to the background only hypothesis. 95\\% CL upper limits between 0.09 and 39~fb are set on the signal production cross section $X\\to SH$ in the $b\\bar{b}\\gamma\\gamma$ final state." }); // ]]> </script> <!-- JQuery Bookmark Button END --> </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"> <!-- replaced page footer --> <div class="pagefooterstripeleft"> CERN Document Server&nbsp;::&nbsp;<a class="footer" href="https://cds.cern.ch/?ln=en">Search</a>&nbsp;::&nbsp;<a class="footer" href="https://cds.cern.ch/submit?ln=en">Submit</a>&nbsp;::&nbsp;<a class="footer" href="https://cds.cern.ch/youraccount/display?ln=en">Personalize</a>&nbsp;::&nbsp;<a class="footer" href="https://cds.cern.ch/help/?ln=en">Help</a>&nbsp;::&nbsp;<a class="footer" href="https://cern.service-now.com/service-portal?id=privacy_policy&se=CDS-Service" target="_blank">Privacy Notice</a>&nbsp;::&nbsp;<a class="footer" href="https://repository.cern/content-policy" target="_blank">Content Policy</a>&nbsp;::&nbsp;<a class="footer" href="https://repository.cern/terms" target="_blank">Terms and Conditions</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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