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<!DOCTYPE html> <html> <head> <title>Tests of Lepton Flavour Universality and searches for Lepton Flavour Violation at LHCb</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <link rel="stylesheet" type="text/css" href="/css/styleroot.css?v=24" /> <link rel="stylesheet" type="text/css" href="/css/style.css?v=24" /> <link rel="schema.dctermsTERMS" href="http://purl.org/dc/terms/" /> <link rel="schema.dcterms" href="http://purl.org/dc/elements/1.1/" /> <meta http-equiv="content-language" content="en" /> <meta name="dcterms.identifier" content="https://pos.sissa.it/405/071"/> <meta name="dcterms.type" content="proceeding"/> <meta name="dcterms.relation" content="7th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2020-2021"/> <meta name="dcterms.isPartOf" content="7th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2020-2021"/> <meta name="citation_conference_abbrev" content="DISCRETE2020-2021"/> <meta name="citation_conference_title" content="7th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2020-2021"/> <meta name="citation_inbook_title" content="Proceedings of 7th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2020-2021 — PoS(DISCRETE2020-2021)"/> <meta name="citation_volume" content="405"/> <meta name="citation_firstpage" content="071"/> <meta name="citation_publisher" content="SISSA Medialab"/> <meta name="dcterms.title" content="Tests of Lepton Flavour Universality and searches for Lepton Flavour Violation at LHCb"/> <meta name="citation_title" content="Tests of Lepton Flavour Universality and searches for Lepton Flavour Violation at LHCb"/> <meta name="dcterms.creator" content="Gioventu, Alessandra"/> <meta name="citation_author" content="Gioventu, Alessandra"/> <meta name="citation_pdf_url" content="https://pos.sissa.it/405/071/pdf"/> <meta name="citation_online_date" content="2022-04-25"/> <meta name="dcterms.available" content="2022-04-25"/> <meta name="citation_publication_date" content="2022-10-05"/> <meta name="dcterms.issued" content="2022-10-05"/> <meta name="citation_abstract" content="An embedded feature of the Standard Model is that different charged leptons have the same interaction strengths with the electroweak-force carriers. This is known as Lepton Flavour Universality (LFU). The LFU is an accidental symmetry of the SM, not the result of some fundamental underlying principle. Recent results on LFU tests in semileptonic $b\rightarrow c \ell \nu$ transitions and rare $b \rightarrow s \ell\ell$ decays, point to a violation of the LFU. If confirmed by further measurements, this would be clear evidence of New Physics in which new heavy particles couple preferentially to $2^{nd}$ or $3^{rd}$ generations of leptons. Many extensions of the SM that include violation of the LFU, predict Lepton Flavour Violating (LFV) processes in hadron decays with charged leptons in the final state. In this talk, the recent results from LHCb on LFU tests along with searches of charged-LFV are reported."/> <meta name="dcterms.abstract" content="An embedded feature of the Standard Model is that different charged leptons have the same interaction strengths with the electroweak-force carriers. This is known as Lepton Flavour Universality (LFU). The LFU is an accidental symmetry of the SM, not the result of some fundamental underlying principle. Recent results on LFU tests in semileptonic $b\rightarrow c \ell \nu$ transitions and rare $b \rightarrow s \ell\ell$ decays, point to a violation of the LFU. If confirmed by further measurements, this would be clear evidence of New Physics in which new heavy particles couple preferentially to $2^{nd}$ or $3^{rd}$ generations of leptons. Many extensions of the SM that include violation of the LFU, predict Lepton Flavour Violating (LFV) processes in hadron decays with charged leptons in the final state. In this talk, the recent results from LHCb on LFU tests along with searches of charged-LFV are reported."/> <meta name="citation_doi" content="10.22323/1.405.0071"/> <meta name="dcterms.identifier" content="10.22323/1.405.0071"/> </head> <body> <img src="/images/headInternal.gif" width="760" height="80" border="0" usemap="#headmap" alt="PoS - Proceedings of Science"/> <map name="headmap" id="headmap"> <area shape="rect" coords="9,9,266,69" href="/" target="_top"/> </map> <script src="/js/lib.js" type="text/javascript"></script> <script type="text/x-mathjax-config"> MathJax.Hub.Config({ tex2jax: {inlineMath: [['$','$'], ['\$','\$']]} }); </script> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"> </script> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"> <script src="https://code.jquery.com/jquery-3.2.1.js" integrity="sha256-DZAnKJ/6XZ9si04Hgrsxu/8s717jcIzLy3oi35EouyE=" crossorigin="anonymous"></script> <script> // on document ready // hide the coauthor list and action-wrappers $(function() { // start the coauthors list hidded (if necessary) $('.start-hidden').hide(); // coauthors list in metadata on top of the page $('#coauthors-toggle').click(function(){ $('#coauthors').toggle(); // change the text of the toggle button if ($("#coauthors").css("display") == "none") { $('#coauthors-toggle').text(" et al. (click to show)"); } else { $('#coauthors-toggle').text(" (click to hide)"); } }); // add, remove, reorder fragments $('#coauthors-add-toggle').click(function(){ $('#coauthors-add-wrapper').toggle(); }); $('#coauthors-remove-toggle').click(function(){ $('#coauthors-remove-wrapper').toggle(); }); $('#coauthors-reorder-toggle').click(function(){ $('#coauthors-reorder-wrapper').toggle(); }); }); </script> <div id="landing-page"> <div class="conference"> <span class="vol">Volume 405</span> - <span class="conf-title"><a href="/405/">7th Symposium on Prospects in the Physics of Discrete Symmetries, DISCRETE 2020-2021 (DISCRETE2020-2021)</a></span> - <span class="session">Parallel sessions Thursday</span> </div> <div class="title">Tests of Lepton Flavour Universality and searches for Lepton Flavour Violation at LHCb</div> <div class="authors"><div class="list"><span class="au">A. Gioventu</span> </div> </div> <div class="files"> <div class="main"> <span class="label">Full text:</span> <span class="content"><a class="matomo_download" href="https://pos.sissa.it/405/071/pdf">pdf</a></span> </div> </div> <div class="history"> <div class="prepub"> <span class="label">Pre-published on:</span> <span class="content">April 25, 2022</span> </div> <div class="pub"> <span class="label">Published on:</span> <span class="content">October 05, 2022</span> </div> </div> <div class="abstract"> <span class="label">Abstract</span> <div class="content">An embedded feature of the Standard Model is that different charged leptons have the same interaction strengths with the electroweak-force carriers. This is known as Lepton Flavour Universality (LFU). The LFU is an accidental symmetry of the SM, not the result of some fundamental underlying principle. Recent results on LFU tests in semileptonic $b\rightarrow c \ell \nu$ transitions and rare $b \rightarrow s \ell\ell$ decays, point to a violation of the LFU. If confirmed by further measurements, this would be clear evidence of New Physics in which new heavy particles couple preferentially to $2^{nd}$ or $3^{rd}$ generations of leptons. Many extensions of the SM that include violation of the LFU, predict Lepton Flavour Violating (LFV) processes in hadron decays with charged leptons in the final state. In this talk, the recent results from LHCb on LFU tests along with searches of charged-LFV are reported.</div> </div> <div class="doi"> DOI: https://doi.org/10.22323/1.405.0071 </div> <div class="howtocite"> <span class="label">How to cite</span> <p>Metadata are provided both in "<a href="/405/071/biba">article</a>" format (very similar to <a href="https://inspirehep.net/">INSPIRE</a>) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "<a href="/405/071/bib">proceeding</a>" format which is more detailed and complete.</p> </div> <div class="license"> <span class="label">Open Access</span> <div class="content license_2"><a rel="license" href="https://creativecommons.org/licenses/by-nc-nd/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://licensebuttons.net/l/by-nc-nd/4.0/88x31.png" /></a>Copyright owned by the author(s) under the term of the <a rel="license" href="https://creativecommons.org/licenses/by-nc-nd/4.0/">Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License</a>.</div> </div> </div>  <div id="footer"> <p>Communicate with the <a href="mailto:%70%6F%73%2D%65%6F%40%70%6F%73%2E%73%69%73%73%61%2E%69%74">PoS editorial office</a> | <a href="/cgi-bin/reader/info.cgi?p=cookies" title="Cookie policy">Cookie policy</a> | <a href="https://medialab.sissa.it/privacy" title="Privacy policy">Privacy policy</a> </p> <p>Published by Sissa Medialab srl Partita IVA: 01097780322</p> </div>   <script type="text/javascript"> var _paq = _paq || []; _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function() { var u="//medialab.sissa.it/analytics/"; _paq.push(['setTrackerUrl', u+'piwik.php']); _paq.push(['setSiteId', 9]); var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0]; g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s); })(); </script> <noscript><p><img src="//medialab.sissa.it/analytics/piwik.php?idsite=9" style="border:0;" alt="" /></p></noscript>  </body> </html>