(Re)interpreting the results of new physics searches at the LHC (15-19 February 2021): Pitfalls in likelihood land

<!DOCTYPE html> <html lang="en" prefix="og: http://ogp.me/ns#" data-canonical-locale="en-GB" data-static-site="false"> <head> <title>(Re)interpreting the results of new physics searches at the LHC (15-19 February 2021): Pitfalls in likelihood land · Indico</title> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="csrf-token" id="csrf-token" content="00000000-0000-0000-0000-000000000000"> <link rel="shortcut icon" type="image/x-icon" href="/images/indico.ico"> <meta property="og:site_name" content="Indico"> <meta property="og:image" content="https://indico.cern.ch/images/indico_square.png"> <meta property="og:title" content="(Re)interpreting the results of new physics searches at the LHC"> <meta property="og:type" content="event"> <meta property="og:description" content="The LHC collaborations are pursuing searches for new physics in a vast variety of channels. While the collaborations typically provide themselves interpretations of their results, for instance in terms of simplified models, the full understanding of the implications of these searches requires the interpretation of the experimental results in the context of all kinds of theoretical models. This is a very active field, with close theory-experiment interaction and with several public tools..."> <script type="application/ld+json"> {"@context":"http://schema.org","@type":"Event","description":"The LHC collaborations are pursuing searches for new physics in a vast variety of channels. While the collaborations typically provide themselves interpretations of their results, for instance in terms of simplified models, the full understanding of the implications of these searches requires the interpretation of the experimental results in the context of all kinds of theoretical models. This is a very active field, with close theory-experiment interaction and with several public tools being developed. A Forum on the interpretation of the LHC results for BSM studies was thus initiated to discuss topics related to the BSM (re)interpretation of LHC data, including the development of the necessary public recasting tools and related infrastructure, and to and to provide a platform for a continued interaction between theorists and with the experiments. This is the sixth workshop of this Forum and will be held purely online. Previous meetings took place workshop: 15-17 June 2016 (kick-off meeting) at CERN workshop: 12-14 Dec 2016 at CERN workshop: 16-18 Oct 2017 at Fermilab workshop: 14-16 May 2018 at CERN workshop: 2-4 April 2019 at Imperial College They resulted in the 2020 report Reinterpretation of LHC Results for New Physics: Status and recommendations after Run 2, arXiv:2003.07868, SciPost Phys. 9, 022 (2020). The aim of this sixth workshop is to review the further developments on the tools, pheno, and of course the experimental sides since the above report, and to prepare for Run 3 of the LHC. In this context, a certain focus will be on recent hot topics like applications of published full and simplified likelihoods, reinterpretations of ML-based analyses and long-lived particle searches, etc. Moreover, we would like to extend the conversation to general best practices for reinterpretation/reuse of experimental results beyond the LHC, and particularly welcome contributions regarding results from precision or astrophysical experiments.","endDate":"2021-02-19T18:00:00+01:00","location":{"@type":"Place","address":"No address set","name":"CERN"},"name":"(Re)interpreting the results of new physics searches at the LHC","performer":[{"@type":"Person","affiliation":{"@type":"Organization","name":"LPSC-Grenoble, CNRS/UGA (FR)"},"name":"Marie-Helene Genest"},{"@type":"Person","affiliation":{"@type":"Organization","name":"Imperial College (GB)"},"name":"Nicholas Wardle"},{"@type":"Person","affiliation":{"@type":"Organization","name":"LPSC Grenoble"},"name":"Sabine Kraml"},{"@type":"Person","affiliation":{"@type":"Organization","name":"Tata Institute of Fundamental Research"},"name":"Nishita Desai"}],"startDate":"2021-02-15T13:00:00+01:00","url":"https://indico.cern.ch/event/982553/"} </script> <script type="text/javascript" src="/assets/i18n/en_GB.js"></script> <script type="text/javascript" src="/assets/i18n/en_GB-react.js"></script> <script type="text/javascript" src="/assets/js-vars/global.js"></script> <script src="/dist/js/exports.88bb921b.bundle.js"></script> <script src="/dist/js/common-runtime.23156d3d.bundle.js"></script> <link rel="stylesheet" href="/dist/css/common.c1d85dae.css" /> <script src="/dist/js/common.53c60872.bundle.js"></script> <link rel="stylesheet" href="/dist/css/react.c0eb75b7.css" /> <script src="/dist/js/react.cbe66cee.bundle.js"></script> <script src="/dist/js/semantic-ui.32899e53.bundle.js"></script> <link rel="stylesheet" href="/dist/css/semantic-ui.03304b73.css" /> <link rel="stylesheet" href="/dist/css/jquery.dee9784c.css" /> <script src="/dist/js/jquery.a9536603.bundle.js"></script> <link rel="stylesheet" href="/dist/css/main.bae03e7a.css" /> <script src="/dist/js/main.3d6afa70.bundle.js"></script> <script src="/dist/js/module_core.5cfba714.bundle.js"></script> <script src="/dist/js/module_events.creation.f24ad529.bundle.js"></script> <script src="/dist/js/module_attachments.7bdcd885.bundle.js"></script> <script src="/dist/js/outdatedbrowser.474403ac.bundle.js"></script> <link rel="stylesheet" href="/dist/css/outdatedbrowser.17d2ff9d.css" /> <script src="/dist/js/module_events.display.59645e8e.bundle.js"></script> <script src="/dist/js/module_events.contributions.0c5df12b.bundle.js"></script> <script src="/dist/js/module_events.header.1ef6cec6.bundle.js"></script> <script src="/dist/js/module_events.search.49360505.bundle.js"></script> <link rel="stylesheet" href="/dist/css/conferences.b0812759.css" /> <script src="/dist/js/markdown.a73700f7.bundle.js"></script> <link rel="stylesheet" href="/static/plugins/owncloud/dist/css/main.9fc172fa.css" /> <script src="/static/plugins/owncloud/dist/js/owncloud.ccba48fe.bundle.js"></script> <script src="/static/plugins/ursh/dist/js/main.583c4589.bundle.js"></script> <script> moment.locale(["en-gb", 'en']); IndicoGlobalVars.isUserAuthenticated = false; </script> <script type="text/javascript" src="/assets/js-vars/user.js"></script> <script src="/dist/js/mathjax.285a258c.bundle.js"></script> <link rel="stylesheet" type="text/css" href="/static/custom/css/footer.css">  <script> (function() { 'use strict'; var url = '//piwik.web.cern.ch/'; var g = document.createElement('script'); var s = document.getElementsByTagName('script')[0]; g.type = 'text/javascript'; g.defer = true; g.async = true; g.src = url + 'piwik.js'; g.onload = init_tracking; s.parentNode.insertBefore(g, s); function init_tracking() { try { track_site(); track_event(); } catch(err) {} } function track_site() { var general_tracker = Piwik.getTracker(url + 'piwik.php', 59); general_tracker.enableLinkTracking(); general_tracker.trackPageView(); } function track_event() { var event_tracker = Piwik.getTracker(url + 'piwik.php', 56); event_tracker.enableLinkTracking(); event_tracker.setCustomVariable(1, 'Conference', '982553', 'page'); event_tracker.setCustomVariable(2, 'Contribution', '982553t4206951', 'page'); event_tracker.trackPageView(); } })(); </script>  </head> <body data-user-id="null" data-debug="false" data-tinymce-content-css="["/dist/css/common.c1d85dae.css","/dist/css/react.c0eb75b7.css","/dist/css/semantic-ui.03304b73.css","/dist/css/jquery.dee9784c.css","/dist/css/main.bae03e7a.css"]" > <ind-bypass-block-links></ind-bypass-block-links> <div class="header"> <div class="announcement-bar weak-hidden warning" data-hash="2449555847"> <div class="flexrow f-self-stretch f-j-center f-a-center"> <i class="icon icon-warning"></i> <div> <p>Help us make Indico better by taking <a href="https://forms.gle/a8cYVhuBxMfFjSb98">this survey</a>! 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</div> </div> </div> </div> <div id="pageSubHeader"></div> </div> </div> <main class="main"><div> <div class="conf clearfix"> <div class="confheader clearfix" style=""> <div class="confTitleBox clearfix" style=""> <div class="confTitle"> <h1> <a href="/event/982553/"> <span class="conference-title-link" style=""> <span itemprop="title">(Re)interpreting the results of new physics searches at the LHC</span> </span> </a> </h1> </div> </div> <div class="confSubTitleBox" style=""> <div class="confSubTitleContent flexrow"> <div class="confSubTitle f-self-stretch" style=""> <div class="datePlace"> <div class="date"> 15–19 Feb 2021 </div> <div class="place">CERN</div> <div class="timezone">Europe/Paris timezone</div> </div> </div> <div id="event-search-box" class="search-box" data-event-id="982553" ></div> </div> </div> </div> <div id="confSectionsBox" class="clearfix"> <div id="flashed-messages" class="flashed-messages"></div> <div class="conf_leftMenu"> <ul id="outer"> <li class="menuConfTitle"> <a href="/event/982553/overview" >Overview</a> <li class="menuConfTitle"> <a href="/event/982553/timetable/" >Timetable</a> <li class="menuConfTitle"> <a href="/event/982553/registrations/" >Registration</a> <li class="menuConfTitle"> <a href="/event/982553/abstracts/" >Call for Abstracts</a><ul class="inner"></ul> <li class="menuConfTitle"> <a href="/event/982553/registrations/participants" >Participant List</a> <li class="menuConfTitle"> <a href="/event/982553/videoconference/" >Videoconference</a> <li class="menuConfTitle"> <a href="/event/982553/page/21530-programme-commitee" >Programme Commitee</a> </ul> </div> <div class="confBodyBox clearfix "> <div class="mainContent"> <div class="col2"> <div class="conference-page item-summary" > <header> <span class="back-button-container"></span> <div class="title"> <div class="text"> <div class="title-with-actions"> <h2><span class="js-mathjax"> Pitfalls in likelihood land </span></h2></div> <div class="subtitle-container"></div> </div> <div class="actions"> <div class="toolbar"> <a class="ursh-get i-button icon-link" title="Obtain short URL" data-original-url="/event/982553/contributions/4206951/"></a> <a href="/event/982553/contributions/4206951/contribution.pdf" class="i-button icon-file-pdf" title="Export to PDF"></a> <div id="contribution-calendar-link" data-event-id="982553" data-contribution-id="4206951"></div> </div> </div> </div> <div class="page-info"> <div class="flexrow f-j-space-between"> <div> <div class="generic-data"> <i class="icon-calendar header-data"></i> <span class="time-info">18 Feb 2021, 13:00</span> </div> <div class="generic-data"> <i class="icon-time header-data"></i> <span class="time-info" title="Duration"> 20m </span> </div> <div class="generic-data"> <span class="location-info contribution-location" data-qtip-html=".qtip-hidden-content" data-qtip-opts='{"hide": {"fixed": true, "delay": 500}}'> <i class="icon-location "></i> <span class="text">virtual (online only) (CERN)</span> </span> <span class="qtip-hidden-content"> <div class="location-info-tip"> <h3>virtual (online only)</h3> <h4>CERN</h4> </div> </span> </div> </div> <div> <span class="contrib-session" style="color: #1f1f02 !important; background: #feffbf !important"> <a href="/event/982553/sessions/385605/" style="color: #1f1f02">Workshop talks</a> </span> </div> </div> </div> </header> <div class="page-content"> <section> <div class="header"> <div class="header-row"> <h3>Speaker</h3> </div> </div> <div class="speaker-list"> <span class="speaker-item icon-user"> <span>Andrew Fowlie</span> <span class="affiliation"> <span class="text">(<span>Nanjing Normal University</span>)</span></span></span> </div> </section> <section> <div class="header"> <div class="header-row"> <h3>Description</h3> </div> </div> <div class="description js-mathjax"> <p>The starting point for a statistically sound reinterpretation of an experimental result is the likelihood function, which encodes the probability of the observed data given an assumed model. When multiple experimental results are considered, as in global fits, a composite likelihood function is used, constructed from likelihood components for all the measurements included in the fit.</p> <p>In most cases the formulation of a likelihood function necessarily involves some approximations. In this talk we will discuss some challenges and subtleties associated with the construction and use of approximate likelihood functions. In particular, we consider how different levels of detail in the likelihood information can impact the results of global fits, and the associated computational expense.</p> </div> </section> <table class="other-fields"> </table> <section> <div class="header"> <div class="header-row"> <h3> Primary author </h3> </div> </div> <div class="speaker-list"> <span itemprop="performers" itemscope itemtype="http://schema.org/Person" class="speaker-item icon-user"> <span>Andrew Fowlie</span> <span class="affiliation"> <span class="text">(<span>Nanjing Normal University</span>)</span> </span> </span> </div> </section> <section class="item-attachments"> <div class="header"> <div class="header-row"> <h3 class="icon-attachment">Presentation materials</h3> </div> </div> <div class="i-box-group vert"> <div class="i-box no-padding"> <div class="i-box-content"> <div class="attachments-box"> <table class="tree"> <tr> <td> <a class="attachment icon-file-pdf " data-previewable="false" data-attachment-id="3705676" href="/event/982553/contributions/4206951/attachments/2192373/3705676/fowlie_ri_forum.pdf" target="_blank" rel="noopener noreferrer" title="fowlie_ri_forum.pdf"><span class="title">fowlie_ri_forum.pdf</span></a> </td> </tr> <tr> <td> <a class="attachment icon-link " data-previewable="false" data-attachment-id="3707366" href="https://cds.cern.ch/record/2752546" target="_blank" rel="noopener noreferrer" title="Recording"><span class="title">Recording</span></a> </td> </tr> </table> </div> </div> </div> </div> </section> <script> setupAttachmentTreeView(); 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(Re)interpreting the results of new physics searches at the LHC (15-19 February 2021): Pitfalls in likelihood land · Indico