ATLAS measures Higgs boson’s decay width

<!DOCTYPE html> <html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# "> <head> <meta charset="utf-8" /> <script>var _paq = _paq || [];(function(){var u=(("https:" == document.location.protocol) ? "https://webanalytics.web.cern.ch/" : "http://webanalytics.web.cern.ch/");_paq.push(["setSiteId", "22"]);_paq.push(["setTrackerUrl", u+"matomo.php"]);_paq.push(["setDoNotTrack", 1]);if (!window.matomo_search_results_active) {_paq.push(["trackPageView"]);}_paq.push(["setIgnoreClasses", ["no-tracking","colorbox"]]);_paq.push(["enableLinkTracking"]);var d=document,g=d.createElement("script"),s=d.getElementsByTagName("script")[0];g.type="text/javascript";g.defer=true;g.async=true;g.src=u+"matomo.js";s.parentNode.insertBefore(g,s);})();</script> <meta name="keywords" content="physics, CERN, Large Hadron Collider, LHC, high-energy physics, particles, science" /> <link rel="canonical" href="https://home.cern/news/news/physics/atlas-measures-higgs-bosons-decay-width" /> <meta property="og:site_name" content="CERN" /> <meta property="og:type" content="website" /> <meta property="og:url" content="https://home.cern/news/news/physics/atlas-measures-higgs-bosons-decay-width" /> <meta property="og:title" content="ATLAS measures Higgs boson’s decay width" /> <meta property="og:description" content="Since discovering the Higgs boson 10 years ago, the ATLAS and CMS collaborations have been carrying out numerous measurements of its properties and its interactions with other particles, which have been consistent with predictions from the Standard Model. The Higgs boson’s mass, for instance, has been measured to be 125 billion electronvolts (GeV), with a precision of 0.1%. However, one property that remains inaccessible via direct measurements is the particle’s decay width, which is linked to its lifetime and, if found to deviate from its predicted value, could indicate the presence of new physics. At the recent Higgs 2022 conference and at a CERN seminar this week, the ATLAS collaboration presented the results of its latest study of this property. Width is a fundamental parameter of any unstable particle with a finite lifetime – the shorter the lifetime, the broader the width. The Higgs boson's width, which represents the range of possible masses around the particle’s nominal mass of 125 GeV, is predicted to be 4.1 MeV – too small to be directly measured. However, its value can be determined by comparing the rate of Higgs boson production at the particle’s nominal mass (“on-shell” production) with that at much larger masses (“off-shell” production). This relies on the fact that the on-shell Higgs boson production rate depends not only on the Higgs boson’s interactions with other particles, but also on its width. By contrast, the off-shell rate is, to a good approximation, independent of the width. In its new study, the ATLAS collaboration looked for off-shell Higgs boson production using proton–proton collision data collected during Run 2 of the Large Hadron Collider (LHC) from 2015 to 2018. In particular, ATLAS physicists searched for collision events where the Higgs boson transforms, or “decays”, into two Z bosons, which in turn decay into four charged leptons or two charged leptons plus two neutrinos, as thesedecay channels provided the highest sensitivity to the off-shell signal. After isolating these events from those of background processes that resemble them but do not involve the Higgs boson, the researchers combined the results from both channels to measure the ratio of the off-shell Higgs boson production rate to its Standard-Model prediction. The data were found to be consistent with Standard Model predictions, rejecting the background-only hypothesis, which assumes no off-shell Higgs boson production, with an observed (expected) statistical significance of 3.2 (2.4) standard deviations. This result provides experimental evidence of off-shell Higgs boson production. By combining these results with their previous on-shell Higgs boson measurements, the ATLAS researchers obtained a Higgs boson width of 4.6 MeV, with upper and lower uncertainties of 2.6 and -2.5 MeV, respectively. This value is in agreement with the Standard Model expectation and corresponds to a particle lifetime of 180 yoctoseconds (1 yoctosecond is 10-24 seconds). The results are compatible with those from a recent study by the CMS collaboration, which also found evidence of off-shell Higgs boson production and measured the particle’s width. With the increased collision energy and greater accumulated data expected from Run 3 of the LHC, more precise measurements of both the production process and the particle’s width are anticipated. Read more on the ATLAS website." /> <meta property="og:image" content="https://cds.cern.ch/images/ATLAS-PHOTO-2019-026-2/file?size=medium" /> <meta name="twitter:card" content="summary_large_image" /> <meta name="twitter:description" content="Since discovering the Higgs boson 10 years ago, the ATLAS and CMS collaborations have been carrying out numerous measurements of its properties and its interactions with other particles, which have been consistent with predictions from the Standard Model. The Higgs boson’s mass, for instance, has been measured to be 125 billion electronvolts (GeV), with a precision of 0.1%. However, one property that remains inaccessible via direct measurements is the particle’s decay width, which is linked to its lifetime and, if found to deviate from its predicted value, could indicate the presence of new physics. At the recent Higgs 2022 conference and at a CERN seminar this week, the ATLAS collaboration presented the results of its latest study of this property. Width is a fundamental parameter of any unstable particle with a finite lifetime – the shorter the lifetime, the broader the width. The Higgs boson's width, which represents the range of possible masses around the particle’s nominal mass of 125 GeV, is predicted to be 4.1 MeV – too small to be directly measured. However, its value can be determined by comparing the rate of Higgs boson production at the particle’s nominal mass (“on-shell” production) with that at much larger masses (“off-shell” production). This relies on the fact that the on-shell Higgs boson production rate depends not only on the Higgs boson’s interactions with other particles, but also on its width. By contrast, the off-shell rate is, to a good approximation, independent of the width. In its new study, the ATLAS collaboration looked for off-shell Higgs boson production using proton–proton collision data collected during Run 2 of the Large Hadron Collider (LHC) from 2015 to 2018. In particular, ATLAS physicists searched for collision events where the Higgs boson transforms, or “decays”, into two Z bosons, which in turn decay into four charged leptons or two charged leptons plus two neutrinos, as thesedecay channels provided the highest sensitivity to the off-shell signal. After isolating these events from those of background processes that resemble them but do not involve the Higgs boson, the researchers combined the results from both channels to measure the ratio of the off-shell Higgs boson production rate to its Standard-Model prediction. The data were found to be consistent with Standard Model predictions, rejecting the background-only hypothesis, which assumes no off-shell Higgs boson production, with an observed (expected) statistical significance of 3.2 (2.4) standard deviations. This result provides experimental evidence of off-shell Higgs boson production. By combining these results with their previous on-shell Higgs boson measurements, the ATLAS researchers obtained a Higgs boson width of 4.6 MeV, with upper and lower uncertainties of 2.6 and -2.5 MeV, respectively. This value is in agreement with the Standard Model expectation and corresponds to a particle lifetime of 180 yoctoseconds (1 yoctosecond is 10-24 seconds). The results are compatible with those from a recent study by the CMS collaboration, which also found evidence of off-shell Higgs boson production and measured the particle’s width. With the increased collision energy and greater accumulated data expected from Run 3 of the LHC, more precise measurements of both the production process and the particle’s width are anticipated. Read more on the ATLAS website." /> <meta name="twitter:site" content="@cern" /> <meta name="twitter:title" content="ATLAS measures Higgs boson’s decay width" /> <meta name="twitter:image" content="https://cds.cern.ch/images/ATLAS-PHOTO-2019-026-2/file?size=medium" /> <meta name="twitter:image:alt" content="ATLAS candidate event for a Higgs boson decaying into two Z bosons that in turn decay into two muons and two electrons." /> <meta name="Generator" content="Drupal 10 (https://www.drupal.org)" /> <meta name="MobileOptimized" content="width" /> <meta name="HandheldFriendly" content="true" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <link rel="icon" href="/sites/default/themes/custom/cernpublic/favicon.ico" type="image/vnd.microsoft.icon" /> <link rel="alternate" hreflang="en" href="https://home.cern/news/news/physics/atlas-measures-higgs-bosons-decay-width" /> <title>ATLAS measures Higgs boson’s decay width | CERN</title> <link rel="stylesheet" media="all" href="/modules/custom/cern-loading/css/cern_loading.css?smqvgl" /> <link rel="stylesheet" media="all" href="//framework.web.cern.ch/framework/3.0/js/owlcarousel/css/owl.carousel.css" /> <link rel="stylesheet" media="all" href="//framework.web.cern.ch/framework/3.0/js/owlcarousel/css/owl.theme.default.css" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/align.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/fieldgroup.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/container-inline.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/clearfix.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/details.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/hidden.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/item-list.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/js.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/nowrap.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/position-container.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/progress.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/reset-appearance.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/resize.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/sticky-header.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/system-status-counter.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/system-status-report-counters.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/system-status-report-general-info.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/tablesort.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/system/css/components/tree-child.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/core/modules/views/css/views.module.css?smqvgl" /> <link rel="stylesheet" media="all" href="/modules/custom/cern-components/patterns/molecules/preview-card/css/component-preview-card.css?smqvgl" /> <link rel="stylesheet" media="all" href="/modules/custom/cern-components/patterns/molecules/news-display/css/news-display.component.css?smqvgl" /> <link rel="stylesheet" media="all" href="/modules/custom/cern-toolbar/assets/css/screen.css?smqvgl" /> <link rel="stylesheet" media="all" href="/modules/custom/cern-toolbar/assets/css/cookieconsent.css?smqvgl" /> <link rel="stylesheet" media="all" href="/modules/custom/cern-components/patterns/molecules/menu/css/menu.component.css?smqvgl" /> <link rel="stylesheet" media="all" href="/modules/contrib/paragraphs/css/paragraphs.unpublished.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/files/color/cernpublic-ac827e9a/colors.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/base.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/layout.css?smqvgl" /> <link rel="stylesheet" media="all" href="//framework.web.cern.ch/framework/3.0/js/prism/prism.css" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/components/footer.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/components/header.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/components/pagination.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/components/forms.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/components/fields.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/components/dropdown.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/components/progress.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/components/accordion.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/components/social-sharing.css?smqvgl" /> <link rel="stylesheet" media="all" href="//framework.web.cern.ch/framework/3.0/js/colorbox/colorbox.css" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/theme.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/cookies.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/viewspage.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/views/faq-views.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/views/agenda-views.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/views/news-views.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/views/stories-views.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/views/resources-views.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/views/taxonomies-views.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/views/search-views.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/views/common-views.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernbase/css/views/generic-views.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernpublic/css/layout.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernpublic/css/overrides.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernpublic/css/header.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernpublic/css/views.css?smqvgl" /> <link rel="stylesheet" media="all" href="/sites/default/themes/custom/cernpublic/css/blocks.css?smqvgl" /> <link rel="preload" href="//framework.web.cern.ch/framework/3.0/images/loader.gif" as="image"> </head> <body class="page-node-185835 page-node-type-news_page cern-theme-on path-node page-node-type-news-page has-glyphicons"> <a href="#main-content" class="visually-hidden focusable skip-link"> Skip to main content </a> <div id="cern-global-loading-layout"><span><span></span></span><span></span></div><div id="cern-toolbar" role="group" aria-label="CERN Toolbar" class="user-not-authenticated"> <h1> <a href="//home.cern" title="CERN"> CERN <span>Accelerating science</span> </a> </h1> <ul> <li class="signin"> <div class="item-list item-list-length-1"> <ul class="cern-signedin toolbar-submenu"><li class="cern-account-links"><a href="https://home.cern/user/login?destination=news/news/physics/atlas-measures-higgs-bosons-decay-width" class="cern-account cern-signin cern-single-mobile-signin">Sign in</a></li></ul> </div> </li> <li><a href="//cern.ch/directory" class="cern-directory" title="Search CERN resources and browse the directory">Directory</a></li> </ul> </div> <div class="dialog-off-canvas-main-canvas" data-off-canvas-main-canvas> <header role="banner"> <div class="header-wrapper"> <div class="site-info col-xs-12 col-sm-2 col-md-3 col-lg-4"> <div class="site-info__logo col-lg-3 col-md-3 col-sm-3"> <a href="/" title="Home" rel="home"> <img src="/sites/default/files/logo/cern-logo.png" alt="home"/> </a> </div> <div class="site-info__text col-lg-9 col-md-9 col-sm-0 col-xs-9"> </div> </div> <div class="site-nav col-xs-12 col-sm-10 col-md-9 col-lg-8"> <div class="region region-header"> <section id="block-cernmegamenu" class="block block-block-content block-block-content51503ac3-f37a-4ef6-9d9e-34cac1020012 clearfix"> <div class="field field--name-field-b-menu field--type-entity-reference-revisions field--label-hidden field--item"><nav role="navigation" aria-labelledby="block-mainnavigation-menu" id="block-mainnavigation" class="block-mainnavigation-cern-megamenu"> <nav class="navbar navbar-default"> <div class="container-fluid">  <div class="navbar-header"> <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> </div>  <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"> <ul class="nav navbar-nav"> <li class="cern-dropdown"> <a class="dropdown-toggle"> About </a> <div class="cern-dropdown-menu row"> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> <div class="block-custom-wrapper block-content block-content--type-basic block-content--view-mode-default ds-1col clearfix"> <div class="field field--name-body field--type-text-with-summary field--label-hidden field--item"><h2>CERN</h2> <p>At CERN, we probe the fundamental structure of particles that make up everything around us. We do so using the world's largest and most complex scientific instruments.</p> <p class="cern-btn"><a class="cern-btn" href="/about">Know more</a></p> </div> </div> </div> <div class="col-xs-0 col-sm-0 col-md-8 col-lg-8 col-item-megamenu"> <div class="row"> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <a href="/about/who-we-are" data-drupal-link-system-path="node/5898">Who we are</a> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/about/who-we-are/our-mission" data-drupal-link-system-path="node/5273">Our Mission</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/about/who-we-are/our-governance" data-drupal-link-system-path="node/5277">Our Governance</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/about/who-we-are/our-governance/member-states" data-drupal-link-system-path="node/5278">Our Member States</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/about/who-we-are/our-history" data-drupal-link-system-path="node/5028">Our History</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/about/who-we-are/our-people" data-drupal-link-system-path="node/5430">Our People</a> </p> </li> </ul> </li> </ul> </div> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <a href="/about/what-we-do" data-drupal-link-system-path="node/5899">What we do</a> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/about/what-we-do/fundamental-research" data-drupal-link-system-path="node/5920">Fundamental research</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/about/what-we-do/our-impact" data-drupal-link-system-path="node/5435">Contribute to society</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/about/what-we-do/environmentally-responsible-research" data-drupal-link-system-path="node/185640">Environmentally responsible research</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/about/what-we-do/bring-nations-together" data-drupal-link-system-path="node/157979">Bring nations together</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/about/what-we-do/inspire-educate" data-drupal-link-system-path="node/9390">Inspire and educate</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources/faqs" data-drupal-link-system-path="resources/faqs">Fast facts and FAQs</a> </p> </li> </ul> </li> </ul> </div> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0 cernmenu-level-last "> <a href="/about/key-achievements" data-drupal-link-system-path="node/5497">Key Achievements</a> </p> </li> </ul> <div class="block-custom-wrapper block-content block-content--type-basic block-content--view-mode-default ds-1col clearfix"> <div class="field field--name-field-visible-title field--type-string field--label-hidden field--item"> <p>Key achievements submenu</p> </div> <div class="field field--name-body field--type-text-with-summary field--label-hidden field--item"><ul class="cern-submenu custom-block-submenu"> <li> <p class="cernmenu-level-1 cernmenu-level-last "><a href="/science/physics/higgs-boson">The Higgs Boson</a></p> </li> <li> <p class="cernmenu-level-1 cernmenu-level-last "><a href="/science/physics/w-boson-sunshine-and-stardust">The W boson</a></p> </li> <li> <p class="cernmenu-level-1 cernmenu-level-last "><a href="/science/physics/z-boson">The Z boson</a></p> </li> <li> <p class="cernmenu-level-1 cernmenu-level-last "><a href="/science/accelerators/large-hadron-collider">The Large Hadron Collider</a></p> </li> <li> <p class="cernmenu-level-1 cernmenu-level-last "><a href="/science/computing/birth-web">The Birth of the web</a></p> </li> <li> <p class="cernmenu-level-1 cernmenu-level-last "><a href="/science/physics/antimatter">Antimatter</a></p> </li> </ul> </div> </div> </div> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> </div> </div> </div> <div class="close-cern-dropdown"></div> </div> </li> <li class="cern-dropdown"> <a class="dropdown-toggle"> News </a> <div class="cern-dropdown-menu row"> <div class="col-xs-12 col-sm-12 col-md-6 col-lg-6 col-item-megamenu"> <div class="views-element-container form-group"> <div class="view view-cern-news-menu-featured view-id-cern_news_menu_featured view-display-id-block_1 js-view-dom-id-507d52237125793e6cc189c67472f6bdb65fdabc3fd2bc699333307e263f8bf1 cern-view-display-block cern-view-display-block_1 clearfix"> <div class="view-header"> Featured news, updates, stories, opinions, announcements </div> <div class="view-content clearfix"> <div class="views-row"> <div data-history-node-id="191265" id="preview-card" class="component-preview-cards box-pattern indico_event" style="background:url('/sites/default/files/styles/large/public/2024-11/202410-267_167.jpg?itok=9FkCAvwX') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-11/202410-267_167.jpg?itok=9FkCAvwX" class="component-preview-cards box-pattern indico_event"> <a class="box-link" target="" href="/news/press-release/cern/cern-council-selects-mark-thomson-next-director-general-starting-2026"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/press-release/cern/cern-council-selects-mark-thomson-next-director-general-starting-2026" hreflang="en" title="CERN Council selects Mark Thomson as next Director-General, starting in 2026"> <span> CERN Council selects Mark Thomson as next Dir... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> At CERN </div> <div class="preview-card__category" style="color:"> Press release </div> <div class="preview-card__date" style="color:"> <time datetime="2024-11-06T11:00:02Z">6 November, 2024</time> </div> </div> </div> </div> </div> </div> <div class="views-row"> <div data-history-node-id="191152" id="preview-card--2" class="component-preview-cards box-pattern indico_event" style="background:url('/sites/default/files/styles/large/public/2024-10/ba1938f2-89a3-4bdd-bd79-5b83ed6f3e35.JPG?itok=Lh4ptU3U') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-10/ba1938f2-89a3-4bdd-bd79-5b83ed6f3e35.JPG?itok=Lh4ptU3U" class="component-preview-cards box-pattern indico_event"> <a class="box-link" target="" href="/news/news/cern/estonian-flag-raised-cern"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/news/cern/estonian-flag-raised-cern" hreflang="en" title="Estonian flag raised at CERN"> <span> Estonian flag raised at CERN </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> At CERN </div> <div class="preview-card__category" style="color:"> News </div> <div class="preview-card__date" style="color:"> <time datetime="2024-10-17T12:33:54Z">17 October, 2024</time> </div> </div> </div> </div> </div> </div> <div class="views-row"> <div data-history-node-id="191124" id="preview-card--3" class="component-preview-cards box-pattern indico_event" style="background:url('/sites/default/files/styles/large/public/2024-10/Picture%201.jpg?itok=YeI6iEmy') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-10/Picture%201.jpg?itok=YeI6iEmy" class="component-preview-cards box-pattern indico_event"> <a class="box-link" target="" href="/news/press-release/physics/particle-physicists-chart-course-future"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/press-release/physics/particle-physicists-chart-course-future" hreflang="en" title="Particle physicists chart a course to the future"> <span> Particle physicists chart a course to the fut... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> Press release </div> <div class="preview-card__date" style="color:"> <time datetime="2024-10-11T09:08:31Z">11 October, 2024</time> </div> </div> </div> </div> </div> </div> <div class="views-row"> <div data-history-node-id="191077" id="preview-card--4" class="component-preview-cards box-pattern indico_event" style="background:url('/sites/default/files/styles/large/public/2024-10/10-Family-photo%20%281%29.jpg?itok=UtnK0P4h') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-10/10-Family-photo%20%281%29.jpg?itok=UtnK0P4h" class="component-preview-cards box-pattern indico_event"> <a class="box-link" target="" href="/news/press-release/cern/blowing-out-70-candles-cern-celebrates-seven-decades-discoveries-and-looks"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/press-release/cern/blowing-out-70-candles-cern-celebrates-seven-decades-discoveries-and-looks" hreflang="en" title="Blowing out 70 candles: CERN celebrates seven decades of discoveries and looks ahead to a brilliant future of science and innovation"> <span> Blowing out 70 candles: CERN celebrates seven... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> At CERN </div> <div class="preview-card__category" style="color:"> Press release </div> <div class="preview-card__date" style="color:"> <time datetime="2024-10-01T10:00:00Z">1 October, 2024</time> </div> </div> </div> </div> </div> </div> </div> <div class="view-footer"> <p class="cern-btn"><a class="cern-btn" href="/news?audience=23">Latest news</a></p> </div> </div> </div> </div> <div class="col-xs-0 col-sm-0 col-md-6 col-lg-6 col-item-megamenu"> <div class="row"> <div class="col-xs-12 col-sm-12 col-md-6 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <a href="/news?audience=23" data-drupal-link-query="{"audience":"23"}" data-drupal-link-system-path="news">News</a> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/news?topic=1114" data-drupal-link-query="{"topic":"1114"}" data-drupal-link-system-path="news">Accelerators</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/news?topic=1118" data-drupal-link-query="{"topic":"1118"}" data-drupal-link-system-path="news">At CERN</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/news?topic=1116" data-drupal-link-query="{"topic":"1116"}" data-drupal-link-system-path="news">Computing</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/news?topic=1115" data-drupal-link-query="{"topic":"1115"}" data-drupal-link-system-path="news">Engineering</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/news?topic=1117" data-drupal-link-query="{"topic":"1117"}" data-drupal-link-system-path="news">Experiments</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/news?topic=1119" data-drupal-link-query="{"topic":"1119"}" data-drupal-link-system-path="news">Knowledge sharing</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/news?topic=1113" data-drupal-link-query="{"topic":"1113"}" data-drupal-link-system-path="news">Physics</a> </p> </li> </ul> </li> </ul> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0 cernmenu-level-last "> <a href="/events" data-drupal-link-system-path="events">Events</a> </p> </li> </ul> </div> <div class="col-xs-12 col-sm-12 col-md-6 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <a href="/cern-community" data-drupal-link-system-path="node/5872">CERN Community</a> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/news?audience=24" data-drupal-link-query="{"audience":"24"}" data-drupal-link-system-path="news">News and announcements</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/news?type=45" data-drupal-link-query="{"type":"45"}" data-drupal-link-system-path="news">Official communications</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/tags/events-cern" data-drupal-link-system-path="taxonomy/term/494">Events</a> </p> </li> </ul> </li> </ul> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <a href="/scientists" data-drupal-link-system-path="node/5827">Scientists</a> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/news?audience=19" data-drupal-link-query="{"audience":"19"}" data-drupal-link-system-path="news">News</a> </p> </li> </ul> </li> </ul> </div> <div class="col-xs-12 col-sm-12 col-md-6 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0 cernmenu-level-last "> <a href="/press" data-drupal-link-system-path="node/5032">Press Room</a> </p> </li> </ul> <div class="block-custom-wrapper block-content block-content--type-basic block-content--view-mode-default ds-1col clearfix"> <div class="field field--name-field-visible-title field--type-string field--label-hidden field--item"> <p>Press Room submenu</p> </div> <div class="field field--name-body field--type-text-with-summary field--label-hidden field--item"><ul class="cern-submenu custom-block-submenu"> <li> <p class="cernmenu-level-1 cernmenu-level-last "><a href="/news?audience=22">Media News</a></p> </li> <li> <p class="cernmenu-level-1 cernmenu-level-last "><a href="/press/resources">Resources</a></p> </li> <li> <p class="cernmenu-level-1 cernmenu-level-last "><a href="/press/contact">Contact</a></p> </li> </ul> </div> </div> </div> </div> </div> <div class="close-cern-dropdown"></div> </div> </li> <li class="cern-dropdown"> <a class="dropdown-toggle"> Science </a> <div class="cern-dropdown-menu row"> <div class="col-xs-12 col-sm-12 col-md-3 col-lg-3 col-item-megamenu"> <div class="block-custom-wrapper block-content block-content--type-basic block-content--view-mode-default ds-1col clearfix"> <div class="field field--name-body field--type-text-with-summary field--label-hidden field--item"><h2>Science</h2> <p><img alt="img" data-entity-type="file" data-entity-uuid="948207c4-d66f-492e-9f8a-3e9a1aa3b55f" src="/sites/default/files/inline-images/pkatyaya/1209226_01-A5-at-72-dpi.jpg" width="561" height="377" loading="lazy"></p> <p>The research programme at CERN covers topics from kaons to cosmic rays, and from the Standard Model to supersymmetry</p> <p class="cern-btn"><a href="/science">Know more</a></p> </div> </div> </div> <div class="col-xs-0 col-sm-0 col-md-9 col-lg-9 col-item-megamenu"> <div class="row"> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <a href="/science/physics" data-drupal-link-system-path="node/5298">Physics</a> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/physics/antimatter" data-drupal-link-system-path="node/5026">Antimatter</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/physics/dark-matter" data-drupal-link-system-path="node/497">Dark matter</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/physics/early-universe" data-drupal-link-system-path="node/499">The early universe</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/physics/higgs-boson" data-drupal-link-system-path="node/182651">The Higgs boson</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/physics/standard-model" data-drupal-link-system-path="node/496">The Standard Model</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/physics" class="plus-more-link" data-drupal-link-system-path="node/5298">+ More</a> </p> </li> </ul> </li> </ul> </div> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <a href="/science/accelerators" data-drupal-link-system-path="node/5038">Accelerators</a> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/accelerators/accelerator-complex" data-drupal-link-system-path="node/18036">CERN's accelerators</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/accelerators/antiproton-decelerator" data-drupal-link-system-path="node/428">The Antiproton Decelerator</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/accelerators/large-hadron-collider" data-drupal-link-system-path="node/432">The Large Hadron Collider</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/accelerators/high-luminosity-lhc" data-drupal-link-system-path="node/5248">High-Luminosity LHC</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/accelerators" class="plus-more-link" data-drupal-link-system-path="node/5038">+ More</a> </p> </li> </ul> </li> </ul> </div> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <a href="/science/engineering" data-drupal-link-system-path="node/5304">Engineering</a> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/engineering/accelerating-radiofrequency-cavities" data-drupal-link-system-path="node/455">Accelerating: radiofrequency cavities</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/engineering/pulling-together-superconducting-electromagnets" data-drupal-link-system-path="node/452">Steering and focusing: magnets and superconductivity</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/engineering/vacuum-empty-interstellar-space" data-drupal-link-system-path="node/454">Circulating: ultra-high vacuum</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/engineering/cryogenics-low-temperatures-high-performance" data-drupal-link-system-path="node/451">Cooling: cryogenic systems</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/engineering/powering-cern" data-drupal-link-system-path="node/453">Powering: energy at CERN</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/engineering" class="plus-more-link" data-drupal-link-system-path="node/5304">+ More</a> </p> </li> </ul> </li> </ul> </div> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <a href="/science/computing" data-drupal-link-system-path="node/5732">Computing</a> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/computing/data-centre" data-drupal-link-system-path="node/5733">The CERN Data Centre</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/computing/grid" data-drupal-link-system-path="node/5736">The Worldwide LHC Computing Grid</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/computing/cern-openlab" data-drupal-link-system-path="node/5759">CERN openlab</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/computing/open-source-open-science" data-drupal-link-system-path="node/5747">Open source for open science</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/computing/birth-web" data-drupal-link-system-path="node/5762">The birth of the web</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/computing" class="plus-more-link" data-drupal-link-system-path="node/5732">+ More</a> </p> </li> </ul> </li> </ul> </div> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <a href="/science/experiments" data-drupal-link-system-path="node/5303">Experiments</a> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/experiments/alice" data-drupal-link-system-path="node/470">ALICE</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/experiments/atlas" data-drupal-link-system-path="node/471">ATLAS</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/experiments/cms" data-drupal-link-system-path="node/472">CMS</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/experiments/lhcb" data-drupal-link-system-path="node/473">LHCb</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/science/experiments" class="plus-more-link" data-drupal-link-system-path="node/5303">+ More</a> </p> </li> </ul> </li> </ul> </div> </div> </div> <div class="close-cern-dropdown"></div> </div> </li> <li class="cern-dropdown"> <a class="dropdown-toggle"> Resources </a> <div class="cern-dropdown-menu row"> <div class="col-xs-12 col-sm-12 col-md-6 col-lg-6 col-item-megamenu"> <div class="views-element-container form-group"> <div class="view view-resource-menu-content view-id-resource_menu_content view-display-id-block_1 js-view-dom-id-9e376dc66ad4dc530b9d8b09e225850f413b1d0a35d8820196403d8bd2c3c1f9 cern-view-display-block cern-view-display-block_1 clearfix"> <h1 class="mb-3 mt-3 text-center">Featured resources</h1> <div class="view-content clearfix"> <div class="views-row"> <div class="views-field views-field-rendered-entity"><span class="field-content"> <div data-history-node-id="191022" id="preview-card--5" class="component-preview-cards box-pattern indico_event" style="background:url('/sites/default/files/styles/large/public/2024-09/CERNCourierSep-Oct2024.jpg?itok=rdOrGlQS') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-09/CERNCourierSep-Oct2024.jpg?itok=rdOrGlQS" class="component-preview-cards box-pattern indico_event"> <a class="box-link" target="" href="/resources/courier/physics/cern-courier-sepoct-2024"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="component-preview-cards__category-icon-vocabulary" data-icon="^"></div> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/resources/courier/physics/cern-courier-sepoct-2024" hreflang="en" title="CERN Courier Sep/Oct 2024"> <span> CERN Courier Sep/Oct 2024 </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Courier </div> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__date" style="color:"> <time datetime="2024-01-09T10:07:31Z">9 January, 2024</time> </div> </div> </div> </div> </div> </span></div> </div> <div class="views-row"> <div class="views-field views-field-rendered-entity"><span class="field-content"> <div data-history-node-id="5047" id="preview-card--6" class="component-preview-cards box-pattern indico_event" style="background:url('//cds.cern.ch/images/CERN-PHOTO-202105-067-19/file?size=medium') no-repeat center center / cover" data-background="//cds.cern.ch/images/CERN-PHOTO-202105-067-19/file?size=medium" class="component-preview-cards box-pattern indico_event"> <a class="box-link" target="" href="/resources/image/accelerators/high-luminosity-lhc-gallery"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="component-preview-cards__category-icon-vocabulary" data-icon="z"></div> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/resources/image/accelerators/high-luminosity-lhc-gallery" hreflang="en" title="High-Luminosity LHC images"> <span> High-Luminosity LHC images </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Image </div> <div class="preview-card__category" style="color:"> Accelerators </div> <div class="preview-card__date" style="color:"> <time datetime="2018-06-20T12:37:57Z">20 June, 2018</time> </div> </div> </div> </div> </div> </span></div> </div> <div class="views-row"> <div class="views-field views-field-rendered-entity"><span class="field-content"> <div data-history-node-id="5179" id="preview-card--7" class="component-preview-cards box-pattern indico_event" style="background:url('/sites/default/files/styles/large/public/2022-05/FAQ-LHC-EN-cover-min_0_0.JPG?itok=6kjMukRO') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2022-05/FAQ-LHC-EN-cover-min_0_0.JPG?itok=6kjMukRO" class="component-preview-cards box-pattern indico_event"> <a class="box-link" target="" href="/resources/brochure/knowledge-sharing/lhc-facts-and-figures"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="component-preview-cards__category-icon-vocabulary" data-icon="^"></div> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/resources/brochure/knowledge-sharing/lhc-facts-and-figures" hreflang="en" title="LHC Facts and Figures"> <span> LHC Facts and Figures </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Brochure </div> <div class="preview-card__category" style="color:"> Knowledge sharing </div> <div class="preview-card__date" style="color:"> <time datetime="2022-05-10T10:00:00Z">10 May, 2022</time> </div> </div> </div> </div> </div> </span></div> </div> </div> <div class="view-footer"> <p class="cern-btn"><a class="cern-btn" href="/resources">See all resources</a></p> </div> </div> </div> </div> <div class="col-xs-0 col-sm-0 col-md-6 col-lg-6 col-item-megamenu"> <div class="row"> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <span>By Topic</span> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?topic=1114" data-drupal-link-query="{"topic":"1114"}" data-drupal-link-system-path="resources">Accelerators</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?topic=1118" data-drupal-link-query="{"topic":"1118"}" data-drupal-link-system-path="resources">At CERN</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?topic=1116" data-drupal-link-query="{"topic":"1116"}" data-drupal-link-system-path="resources">Computing</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?topic=1115" data-drupal-link-query="{"topic":"1115"}" data-drupal-link-system-path="resources">Engineering</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?topic=1117" data-drupal-link-query="{"topic":"1117"}" data-drupal-link-system-path="resources">Experiments</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?topic=1119" data-drupal-link-query="{"topic":"1119"}" data-drupal-link-system-path="resources">Knowledge sharing</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?topic=1113" data-drupal-link-query="{"topic":"1113"}" data-drupal-link-system-path="resources">Physics</a> </p> </li> </ul> </li> </ul> </div> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <span>By format</span> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?type=62" data-drupal-link-query="{"type":"62"}" data-drupal-link-system-path="resources">360 image</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?type=53" data-drupal-link-query="{"type":"53"}" data-drupal-link-system-path="resources">Annual report</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?type=56" data-drupal-link-query="{"type":"56"}" data-drupal-link-system-path="resources">Brochure</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources/bulletin/cern/cern-bulletin" data-drupal-link-system-path="node/5055">Bulletin</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?type=52" data-drupal-link-query="{"type":"52"}" data-drupal-link-system-path="resources">Courier</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?type=59" data-drupal-link-query="{"type":"59"}" data-drupal-link-system-path="resources">Image</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?type=61" data-drupal-link-query="{"type":"61"}" data-drupal-link-system-path="resources">Video</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources" class="plus-more-link" data-drupal-link-system-path="resources">+ More</a> </p> </li> </ul> </li> </ul> </div> <div class="col-xs-12 col-sm-12 col-md-4 col-lg-4 col-item-megamenu"> <ul class="cern-submenu"> <li> <p class="h2 cernmenu-level-0"> <span>By audience</span> </p> <ul class=""> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?audience=24" data-drupal-link-query="{"audience":"24"}" data-drupal-link-system-path="resources">CERN community</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?audience=21" data-drupal-link-query="{"audience":"21"}" data-drupal-link-system-path="resources">Educators</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?audience=23" data-drupal-link-query="{"audience":"23"}" data-drupal-link-system-path="resources">General public</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?audience=17" data-drupal-link-query="{"audience":"17"}" data-drupal-link-system-path="resources">Industry</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources/audience/resources-topic" data-drupal-link-system-path="node/5436">Media</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?audience=19" data-drupal-link-query="{"audience":"19"}" data-drupal-link-system-path="resources">Scientists</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources?audience=20" data-drupal-link-query="{"audience":"20"}" data-drupal-link-system-path="resources">Students</a> </p> </li> <li> <p class=" cernmenu-level-1 cernmenu-level-last "> <a href="/resources" class="plus-more-link" data-drupal-link-system-path="resources">+ More</a> </p> </li> </ul> </li> </ul> </div> </div> </div> <div class="close-cern-dropdown"></div> </div> </li> <li class="cern-dropdown cern-menu-search"> <a href="#" class="dropdown-toggle cern-menu-item-search">search</a> <div class="cern-dropdown-menu row"> <div class="close-cern-dropdown"></div> <div class="col-md-offset-2 col-md-8 cern-menu-content-search"> <span class="placeholder-of-search hidden d-none">E.G. BIRTH OF WEB, LHC PAGE 1, BULLETIN...</span> <span class="placeholder-of-search-mobile hidden d-none">E.G. BIRTH OF WEB, LHC...</span> <div class="search-block-form block block-search block-search-form-block" data-drupal-selector="search-block-form" role="search"> <form action="/search/node" method="get" id="search-block-form" accept-charset="UTF-8"> <div class="form-item js-form-item form-type-search js-form-type-search form-item-keys js-form-item-keys form-no-label form-group"> <label for="edit-keys" class="control-label sr-only">Search</label> <div class="input-group"><input title="Enter the terms you wish to search for." data-drupal-selector="edit-keys" class="form-search form-control" placeholder="Search" type="search" id="edit-keys" name="keys" value="" size="15" maxlength="128" data-toggle="tooltip" /><span class="input-group-btn"><button type="submit" value="Search" class="button js-form-submit form-submit btn-primary btn icon-only"><span class="sr-only">Search</span><span class="icon glyphicon glyphicon-search" aria-hidden="true"></span></button></span></div> </div> <div class="form-actions form-group js-form-wrapper form-wrapper" data-drupal-selector="edit-actions" id="edit-actions"></div> </form> </div> </div> </div> </li> <li class="dropdown cern-menu-lang-switcher"> <a class="dropdown-toggle" data-toggle="dropdown" aria-expanded="true"> <span class="separator">|</span> en <span class="caret"></span> </a> <ul class="dropdown-menu"> <li><section class="language-switcher-language-url block block-language block-language-blocklanguage-interface clearfix" role="navigation"> <ul class="links"><li hreflang="en" data-drupal-link-system-path="node/185835" class="en is-active"><a href="/news/news/physics/atlas-measures-higgs-bosons-decay-width" class="language-link is-active" hreflang="en" data-drupal-link-system-path="node/185835">en</a></li><li hreflang="fr" data-drupal-link-system-path="node/185835" class="fr"><a href="/fr/node/185835" class="language-link" hreflang="fr" data-drupal-link-system-path="node/185835">fr</a></li></ul> </section> </li> </ul> </li> </ul> </div>  </div>  </nav> </nav> </div> </section> </div> </div> </div> </div> </header> <main role="main"> <a id="main-content" tabindex="-1"></a> <div class="container cern-page-display-page cern-page-display-news_page"> <div class="has-right-column wrapper-center col-md-9 col-sm-12 col-xs-12"> <div class="region region-content"> <div data-drupal-messages-fallback class="hidden"></div> <div data-drupal-messages-fallback class="hidden"></div> <div class="row mt-2"> <div class="col-md-12 news-node-full-content-first-breadcrumbs"> <a href="/news"> News </a> <a href="/news?type=36 "> News </a> <a href="/news?type=36 &topic=1113 "> Topic: Physics </a> </div> <div class="col-md-12"> <hr class="news-page-hr-separator"/> </div> </div> <div class="row news-node-center-content clearfix"> <div class="col-md-12 news-node-full-content-left"> <h1 class="news-node-full-content-title mt-0"> ATLAS measures Higgs boson’s decay width </h1> <p class="news-node-full-content-strap"> The decay width is linked to the particle’s lifetime and if found to deviate from its predicted value could indicate the presence of new physics </p> <div class="news-node-full-content-created-date-author"> <p class="news-node-full-content-created_date"> <time datetime="2022-11-18T10:17:15Z">18 November, 2022</time> </p> <p class="news-node-full-content-pipe ml-1 mr-1"> | </p> <p class="news-node-full-content-author"> By <a href="/authors/atlas-collaboration" hreflang="en">ATLAS collaboration</a> </p> </div> <div class="news-node-full-content-image mt-2"> <figure class="cds-image" data-record-id="2682219" data-filename="figaux_02" id="ATLAS-PHOTO-2019-026-2"> <a href="//cds.cern.ch/images/ATLAS-PHOTO-2019-026-2" title="View on CDS"> <img alt="ATLAS Event Displays: Run 2 Higgs boson candidate events" src="//cds.cern.ch/images/ATLAS-PHOTO-2019-026-2/file?size=large"/> </a> <figcaption> ATLAS candidate event for a Higgs boson decaying into two Z bosons that in turn decay into two muons and two electrons. <span> (Image: CERN)</span> </figcaption> </figure> </div> <div class="news-node-full-content-body clearfix full-html-markup full-text-animation"> <p class="BodyA" style="border:none; text-align:start; margin-bottom:15px">Since discovering the <a href="/science/physics/higgs-boson">Higgs boson</a> 10 years ago, the ATLAS and CMS collaborations have been carrying out numerous measurements of its properties and its interactions with other particles, which have been  consistent with predictions from the <a href="/science/physics/standard-model">Standard Model</a>. The Higgs boson<span dir="RTL" lang="AR-SA" style="font-family:"Arial Unicode MS", sans-serif">’</span>s mass, for instance, has been measured to be 125 billion electronvolts (GeV), with a precision of 0.1%. However, one property that remains inaccessible via direct measurements is the particle’s <font face="Arial Unicode MS, sans-serif">decay </font>width, which is linked to its lifetime and, if found to deviate from its predicted value, could indicate the presence of new physics. At the recent <a href="https://indico.cern.ch/event/1086716/contributions/5058702/">Higgs 2022 conference</a> and at a <a href="https://indico.cern.ch/event/1187940/">CERN seminar</a> this week, the <a href="/science/experiments/atlas">ATLAS</a>  collaboration presented the results of its latest study of this property.</p> <p>Width is a fundamental parameter of any unstable particle with a finite lifetime – the shorter the lifetime, the broader the width. The Higgs boson's width, which represents the range of possible masses around the particle’s nominal mass of 125 GeV, is predicted to be 4.1 MeV – too small to be directly measured. However, its value can be determined by comparing the rate of Higgs boson production at the particle’s nominal mass (“on-shell” production) with that at much larger masses (“off-shell” production). This relies on the fact that the on-shell Higgs boson production rate depends not only on the Higgs boson<span dir="RTL" lang="AR-SA" style="font-family:"Arial Unicode MS", sans-serif">’</span>s interactions with other particles, but also on its width. By contrast, the off-shell rate is, to a good approximation, independent of the width.</p> <p>In its <a href="https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2022-068/">new study</a>, the ATLAS collaboration looked for off-shell Higgs boson production using proton–proton collision data collected during Run 2 of the <a href="https://home.cern/science/accelerators/large-hadron-collider">Large Hadron Collider</a> (LHC) from 2015 to 2018. In particular, ATLAS physicists searched for collision events where the Higgs boson transforms, or “decays”, into two <a href="/science/physics/z-boson">Z bosons</a>, which in turn decay into four charged leptons or two charged leptons plus two neutrinos, as thesedecay channels provided the highest sensitivity to the off-shell signal.</p> <p>After isolating these events from those of background processes that resemble them but do not involve the Higgs boson, the researchers combined the results from both channels to measure the ratio of the off-shell Higgs boson production rate to its Standard-Model prediction. The data were found to be consistent with Standard Model predictions, rejecting the background-only hypothesis, which assumes no off-shell Higgs boson production, with an observed (expected) statistical significance of 3.2 (2.4) standard deviations. This result provides experimental evidence of off-shell Higgs boson production.</p> <p>By combining these results with their previous <a href="http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2018-29/">on-shell Higgs boson measurements</a>, the ATLAS researchers obtained a Higgs boson width of 4.6 MeV, with upper and lower uncertainties of 2.6 and -2.5 MeV, respectively. This value is in agreement with the Standard Model expectation and corresponds to a particle lifetime of 180 yoctoseconds (1 yoctosecond is 10<sup>-24</sup> seconds).</p> <p>The results are compatible with those from a <a href="/news/news/physics/cms-homes-higgs-bosons-lifetime">recent study</a> by the CMS collaboration, which also found evidence of off-shell Higgs boson production and measured the particle’s width. With the increased collision energy and greater accumulated data expected from Run 3 of the LHC, more precise measurements of both the production process and the particle’s width are anticipated.</p> <p><em>Read more on the <a href="https://atlas.cern/Updates/Briefing/Higgs-Total-Width">ATLAS website</a>.</em></p> </div> <div class="news-node-full-content-tags "> <a href="/tags/atlas" hreflang="en">ATLAS</a><a href="/tags/higgs-boson" hreflang="en">Higgs boson</a><a href="/tags/standard-model" hreflang="en">Standard Model</a> </div> </div> </div> </div> </div> <div class="sidebar-right col-md-3 col-sm-12 col-xs-12"> <div class="region region-right"> <section class="views-element-container block block-views block-views-blocknews-microviews-block-12 clearfix" id="block-views-block-news-microviews-block-12"> <div class="form-group"> <div class="vertical-boxes view view-news-microviews view-id-news_microviews view-display-id-block_12 js-view-dom-id-f778b5ee2389b526f459c98c1cc401eb105eab82fef18a256fbf8a3165eb5612 cern-view-display-block cern-view-display-block_12 clearfix"> <div class="view-header"> <h2>Related Articles</h2> </div> <div class="view-content clearfix"> <div class="views-row"> <div data-history-node-id="191310" id="preview-card--2" class="component-preview-cards box-pattern" style="background:url('/sites/default/files/styles/large/public/2024-11/Image_Medium.png?itok=07-D6dwG') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-11/Image_Medium.png?itok=07-D6dwG" class="component-preview-cards box-pattern"> <a class="box-link" target="" href="/news/news/physics/atlas-observes-top-quarks-lead-lead-collisions"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/news/physics/atlas-observes-top-quarks-lead-lead-collisions" hreflang="en" title="ATLAS observes top quarks in lead–lead collisions"> <span> ATLAS observes top quarks in lead–lead collis... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> News </div> <div class="preview-card__date" style="color:"> <time datetime="2024-11-15T10:16:40Z">15 November, 2024</time> </div> </div> </div> </div> </div> </div> <div class="views-row"> <div data-history-node-id="191269" id="preview-card--2" class="component-preview-cards box-pattern news_page" style="background:url('/sites/default/files/styles/large/public/2024-11/CERN%20Thumbnails%20%281%29.png?itok=r-vamrr9') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-11/CERN%20Thumbnails%20%281%29.png?itok=r-vamrr9" class="component-preview-cards box-pattern news_page"> <a class="box-link" target="" href="/news/news/experiments/heavy-ion-run-lhc-begins"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/news/experiments/heavy-ion-run-lhc-begins" hreflang="en" title="Heavy-ion run at the LHC begins"> <span> Heavy-ion run at the LHC begins </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Experiments </div> <div class="preview-card__category" style="color:"> News </div> <div class="preview-card__date" style="color:"> <time datetime="2024-11-06T16:30:00Z">6 November, 2024</time> </div> </div> </div> </div> </div> </div> <div class="views-row"> <div data-history-node-id="191144" id="preview-card" class="component-preview-cards box-pattern news_page" style="background:url('/sites/default/files/styles/large/public/2024-10/202201-006_474.jpeg?itok=JN9efjE6') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-10/202201-006_474.jpeg?itok=JN9efjE6" class="component-preview-cards box-pattern news_page"> <a class="box-link" target="" href="/news/news/physics/decoding-top-quarks-precision"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/news/physics/decoding-top-quarks-precision" hreflang="en" title="Decoding top quarks with precision"> <span> Decoding top quarks with precision </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> News </div> <div class="preview-card__date" style="color:"> <time datetime="2024-10-16T08:05:22Z">16 October, 2024</time> </div> </div> </div> </div> </div> </div> </div> <div class="view-footer"> <a href="/news">View all news</a> </div> </div> </div> </section> </div> </div> </div> <div class="content-footer-wrapper"> <div class="has-right-column row content-footer-row container"> <div class="col-md-12 content-footer-container"> <div class="region region-contentfooter"> <section class="views-element-container block block-views block-views-blocknews-microviews-block-13 clearfix" id="block-views-block-news-microviews-block-13"> <div class="form-group"> <div class="horizontal-boxes view view-news-microviews view-id-news_microviews view-display-id-block_13 js-view-dom-id-10ee2e351491d83cc15bd06191b5657afb7108149bb3b95fd2067b8669d1689d cern-view-display-block cern-view-display-block_13 clearfix"> <div class="view-header"> <h2>Also On Physics</h2> </div> <div class="view-content clearfix"> <div class="carousel-cern-item row"> <div class="horizontal-boxes-row views-row col-md-4"><div class="views-field views-field-rendered-entity"><span class="field-content"> <div data-history-node-id="191310" id="preview-card--4" class="component-preview-cards box-pattern news_page" style="background:url('/sites/default/files/styles/large/public/2024-11/Image_Medium.png?itok=07-D6dwG') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-11/Image_Medium.png?itok=07-D6dwG" class="component-preview-cards box-pattern news_page"> <a class="box-link" target="" href="/news/news/physics/atlas-observes-top-quarks-lead-lead-collisions"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/news/physics/atlas-observes-top-quarks-lead-lead-collisions" hreflang="en" title="ATLAS observes top quarks in lead–lead collisions"> <span> ATLAS observes top quarks in lead–lead collis... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> News </div> <div class="preview-card__date" style="color:"> <time datetime="2024-11-15T10:16:40Z">15 November, 2024</time> </div> </div> </div> </div> </div> </span></div></div> <div class="horizontal-boxes-row views-row col-md-4"><div class="views-field views-field-rendered-entity"><span class="field-content"> <div data-history-node-id="191191" id="preview-card--5" class="component-preview-cards box-pattern news_page" style="background:url('/sites/default/files/styles/large/public/2024-10/D0-event-displat.jpg?itok=WWWE95VJ') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-10/D0-event-displat.jpg?itok=WWWE95VJ" class="component-preview-cards box-pattern news_page"> <a class="box-link" target="" href="/news/news/physics/cms-uses-photons-probe-structure-nuclei"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/news/physics/cms-uses-photons-probe-structure-nuclei" hreflang="en" title="CMS uses photons to probe the structure of nuclei"> <span> CMS uses photons to probe the structure of nu... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> News </div> <div class="preview-card__date" style="color:"> <time datetime="2024-10-25T07:50:39Z">25 October, 2024</time> </div> </div> </div> </div> </div> </span></div></div> <div class="horizontal-boxes-row views-row col-md-4"><div class="views-field views-field-rendered-entity"><span class="field-content"> <div data-history-node-id="191144" id="preview-card--6" class="component-preview-cards box-pattern news_page" style="background:url('/sites/default/files/styles/large/public/2024-10/202201-006_474.jpeg?itok=JN9efjE6') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-10/202201-006_474.jpeg?itok=JN9efjE6" class="component-preview-cards box-pattern news_page"> <a class="box-link" target="" href="/news/news/physics/decoding-top-quarks-precision"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/news/physics/decoding-top-quarks-precision" hreflang="en" title="Decoding top quarks with precision"> <span> Decoding top quarks with precision </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> News </div> <div class="preview-card__date" style="color:"> <time datetime="2024-10-16T08:05:22Z">16 October, 2024</time> </div> </div> </div> </div> </div> </span></div></div> </div> <div class="carousel-cern-item row"> <div class="horizontal-boxes-row views-row col-md-4"><div class="views-field views-field-rendered-entity"><span class="field-content"> <div data-history-node-id="191124" id="preview-card--7" class="component-preview-cards box-pattern news_page" style="background:url('/sites/default/files/styles/large/public/2024-10/Picture%201.jpg?itok=YeI6iEmy') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-10/Picture%201.jpg?itok=YeI6iEmy" class="component-preview-cards box-pattern news_page"> <a class="box-link" target="" href="/news/press-release/physics/particle-physicists-chart-course-future"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/press-release/physics/particle-physicists-chart-course-future" hreflang="en" title="Particle physicists chart a course to the future"> <span> Particle physicists chart a course to the fut... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> Press release </div> <div class="preview-card__date" style="color:"> <time datetime="2024-10-11T09:08:31Z">11 October, 2024</time> </div> </div> </div> </div> </div> </span></div></div> <div class="horizontal-boxes-row views-row col-md-4"><div class="views-field views-field-rendered-entity"><span class="field-content"> <div data-history-node-id="191040" id="preview-card--8" class="component-preview-cards box-pattern news_page" style="background:url('/sites/default/files/styles/large/public/2024-09/Picture1.png?itok=mX0zoim3') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-09/Picture1.png?itok=mX0zoim3" class="component-preview-cards box-pattern news_page"> <a class="box-link" target="" href="/news/news/physics/alice-probes-strong-interaction-three-body-problem"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/news/physics/alice-probes-strong-interaction-three-body-problem" hreflang="en" title="ALICE probes the strong interaction three-body problem"> <span> ALICE probes the strong interaction three-bod... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> News </div> <div class="preview-card__date" style="color:"> <time datetime="2024-09-25T12:26:52Z">25 September, 2024</time> </div> </div> </div> </div> </div> </span></div></div> <div class="horizontal-boxes-row views-row col-md-4"><div class="views-field views-field-rendered-entity"><span class="field-content"> <div data-history-node-id="191036" id="preview-card--9" class="component-preview-cards box-pattern news_page" style="background:url('/sites/default/files/styles/large/public/2024-09/NA62_view.jpg?itok=gIdWDJ_v') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-09/NA62_view.jpg?itok=gIdWDJ_v" class="component-preview-cards box-pattern news_page"> <a class="box-link" target="" href="/news/press-release/physics/na62-experiment-cern-observes-ultra-rare-particle-decay"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/press-release/physics/na62-experiment-cern-observes-ultra-rare-particle-decay" hreflang="en" title="NA62 experiment at CERN observes ultra-rare particle decay"> <span> NA62 experiment at CERN observes ultra-rare p... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> Press release </div> <div class="preview-card__date" style="color:"> <time datetime="2024-09-25T09:28:44Z">25 September, 2024</time> </div> </div> </div> </div> </div> </span></div></div> </div> <div class="carousel-cern-item row"> <div class="horizontal-boxes-row views-row col-md-4"><div class="views-field views-field-rendered-entity"><span class="field-content"> <div data-history-node-id="190912" id="preview-card--10" class="component-preview-cards box-pattern news_page" style="background:url('/sites/default/files/styles/large/public/2024-09/Top-Top-entanglement-ATLAS-v03%20%2800049%29-no-p.jpg?itok=GMV9Dcic') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-09/Top-Top-entanglement-ATLAS-v03%20%2800049%29-no-p.jpg?itok=GMV9Dcic" class="component-preview-cards box-pattern news_page"> <a class="box-link" target="" href="/news/press-release/physics/lhc-experiments-cern-observe-quantum-entanglement-highest-energy-yet"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/press-release/physics/lhc-experiments-cern-observe-quantum-entanglement-highest-energy-yet" hreflang="en" title="LHC experiments at CERN observe quantum entanglement at the highest energy yet"> <span> LHC experiments at CERN observe quantum entan... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> Press release </div> <div class="preview-card__date" style="color:"> <time datetime="2024-09-18T16:00:00Z">18 September, 2024</time> </div> </div> </div> </div> </div> </span></div></div> <div class="horizontal-boxes-row views-row col-md-4"><div class="views-field views-field-rendered-entity"><span class="field-content"> <div data-history-node-id="190968" id="preview-card--11" class="component-preview-cards box-pattern news_page" style="background:url('/sites/default/files/styles/large/public/2024-09/SMP-23-002-7%20%281%29.png?itok=1iijIBMc') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-09/SMP-23-002-7%20%281%29.png?itok=1iijIBMc" class="component-preview-cards box-pattern news_page"> <a class="box-link" target="" href="/news/press-release/physics/cms-experiment-cern-weighs-w-boson-mass"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/press-release/physics/cms-experiment-cern-weighs-w-boson-mass" hreflang="en" title="CMS experiment at CERN weighs in on the W boson mass"> <span> CMS experiment at CERN weighs in on the W bos... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> Press release </div> <div class="preview-card__date" style="color:"> <time datetime="2024-09-17T14:43:01Z">17 September, 2024</time> </div> </div> </div> </div> </div> </span></div></div> <div class="horizontal-boxes-row views-row col-md-4"><div class="views-field views-field-rendered-entity"><span class="field-content"> <div data-history-node-id="190901" id="preview-card--12" class="component-preview-cards box-pattern news_page" style="background:url('/sites/default/files/styles/large/public/2024-09/ATLAS-Event-Display-ZHcc-banner.png?itok=6jH5jzgr') no-repeat center center / cover" data-background="/sites/default/files/styles/large/public/2024-09/ATLAS-Event-Display-ZHcc-banner.png?itok=6jH5jzgr" class="component-preview-cards box-pattern news_page"> <a class="box-link" target="" href="/news/news/physics/atlas-probes-higgs-interaction-heaviest-quarks"></a> <div class="component-preview-cards__veil"></div> <div class="component-preview-cards__box_wrapper"> <div class="component-preview-cards__box"> <div class="preview-card__title"> <h3 class="standard-title"> <a href="/news/news/physics/atlas-probes-higgs-interaction-heaviest-quarks" hreflang="en" title="ATLAS probes Higgs interaction with the heaviest quarks"> <span> ATLAS probes Higgs interaction with the heavi... </span> </a> </h3> </div> <div class="preview-card__body"></div> <div class="preview-cards__subtext"> <div class="preview-card__category" style="color:"> Physics </div> <div class="preview-card__category" style="color:"> News </div> <div class="preview-card__date" style="color:"> <time datetime="2024-09-09T09:13:17Z">9 September, 2024</time> </div> </div> </div> </div> </div> </span></div></div> </div> </div> <div class="view-footer"> <a href="/news?audience=24">View all news</a> </div> </div> </div> </section> </div> </div> </div> </div> </main> <footer role="contentinfo"> <div class="row cern-footer"> <div class="col-xs-12 col-sm-4 col-md-4 col-lg-4 footer-first-col"> <div class="region region-footercolumn1"> <section id="block-followus" class="block block-block-content block-block-content6d2579e3-b650-496f-b854-0c744e176f43 clearfix"> <div class="block-custom-wrapper block-content block-content--type-basic block-content--view-mode-full ds-1col clearfix"> <div class="field field--name-field-visible-title field--type-string field--label-hidden field--item"> <p>Follow Us</p> </div> <div class="field field--name-body field--type-text-with-summary field--label-hidden field--item"><p style="font-size:36px; font-family: CERNIcons, CernIcons, cern-icons; display: flex; gap: 10px;"><a href="http://www.facebook.com/cern"><img alt="Facebook icon" data-entity-type="file" data-entity-uuid="5da97013-d976-42e3-aaf3-c2cdf2683c3d" height="40" src="/sites/default/files/inline-images/lburdych/Facebook.png" width="40" loading="lazy"> </a> <a href="http://www.instagram.com/cern"> <img alt="Instagram icon" data-entity-type="file" data-entity-uuid="e80bf359-c309-4a5e-ae36-a6d4b950b285" height="40" src="/sites/default/files/inline-images/lburdych/Instagram.png" width="40" loading="lazy"> </a> <a href="https://www.tiktok.com/@cern_ontiktok"> <img alt="TikTok icon" data-entity-type="file" data-entity-uuid="8fc6b5aa-066e-4eb5-88de-56b61690e174" height="40" src="/sites/default/files/inline-images/lburdych/TikTok_0.png" width="40" loading="lazy"></a> <a href="https://x.com/CERN"> <img alt="X icon" data-entity-type="file" data-entity-uuid="f1391fcf-1b27-42d5-9712-2052e2fceee5" height="40" src="/sites/default/files/inline-images/lburdych/X.png" width="40" loading="lazy"> </a> <a href="http://www.linkedin.com/company/cern"> <img alt="LinkedIn icon" data-entity-type="file" data-entity-uuid="8674b1e8-b762-48f5-a649-f251a0eb6ad7" height="40" src="/sites/default/files/inline-images/lburdych/LinkedIn.png" width="40" loading="lazy"> </a> <a href="http://www.youtube.com/user/cerntv"> <img alt="Youtube icon" data-entity-type="file" data-entity-uuid="d429f87c-f790-4309-b0be-970374a526f9" height="40" src="/sites/default/files/inline-images/lburdych/Youtube.png" width="40" loading="lazy"></a></p> <p> </p> <p><a href="https://linktr.ee/CERN_official" rel="noopener noreferrer" target="_blank">More Social Media Accounts</a></p> </div> </div> </section> </div> </div> <div class="col-xs-12 col-sm-8 col-md-8 col-lg-8 footer-second-col"> <div class="row">  <div class="col-sm-5 col-md-4 col-md-offset-0 col-lg-4 col-lg-offset-0"> <div class="region region-footercolumn2"> <nav role="navigation" aria-labelledby="block-findusmenu-menu" id="block-findusmenu"> <h2 id="block-findusmenu-menu">Find us</h2> <ul class="menu menu--find-us-menu nav"> <li class="first"> <a href="/contact" data-drupal-link-system-path="node/150">Contact us</a> </li> <li class="last"> <a href="/directions" data-drupal-link-system-path="node/153">Getting here</a> </li> </ul> </nav> <section id="block-contactus" class="block block-block-content block-block-content17426485-662a-41e2-b3c6-3e42f882ec6f clearfix"> <div class="block-custom-wrapper block-content block-content--type-basic block-content--view-mode-full ds-1col clearfix"> <div class="field field--name-body field--type-text-with-summary field--label-hidden field--item"><p> </p> <ul> <li>CERN</li> <li>Esplanade des Particules 1</li> <li>P.O. Box</li> <li>1211 Geneva 23</li> <li>Switzerland</li> </ul> </div> </div> </section> </div> </div>  <div class="col-sm-6 col-sm-offset-1 col-md-4 col-md-offset-0 col-lg-4"> <div class=" mb-4"> <div class="region region-footercolumn3"> <nav role="navigation" aria-labelledby="block-connectwithusfooter-menu" id="block-connectwithusfooter"> <h2 id="block-connectwithusfooter-menu">CERN & You</h2> <ul class="menu menu--connect-with-us-footer nav"> <li class="first"> <a href="http://cern.ch/procurement">Doing business with CERN</a> </li> <li> <a href="https://cern.ch/knowledgetransfer">Knowledge transfer</a> </li> <li> <a href="https://voisins.web.cern.ch/en">CERN's neighbours</a> </li> <li> <a href="https://cernandsocietyfoundation.cern">CERN & Society Foundation</a> </li> <li> <a href="/partnerships" data-drupal-link-system-path="node/160">Partnerships</a> </li> <li class="last"> <a href="https://alumni.cern">Alumni</a> </li> </ul> </nav> </div> </div> </div>  <div class="col-sm-6 col-sm-offset-6 col-md-4 col-md-offset-0 col-lg-4 col-lg-offset-0"> <div class=" mb-4"> <div class="region region-footercolumn4"> <nav role="navigation" aria-labelledby="block-generalinfofooter-menu" id="block-generalinfofooter"> <h2 id="block-generalinfofooter-menu">General Information</h2> <ul class="menu menu--general-info-footer nav"> <li class="first"> <a href="https://careers.cern">Careers</a> </li> <li> <a href="https://visit.cern/">Visits</a> </li> <li> <a href="/data-privacy-protection-policy" data-drupal-link-system-path="node/166">Privacy policy</a> </li> <li class="last"> <a href="/cookies" data-drupal-link-system-path="node/165">Cookie Management</a> </li> </ul> </nav> </div> </div> </div> </div> </div> </div> <div class="copy-wrapper"> <a href="https://copyright.web.cern.ch/"> Copyright </a>  © 2024 CERN</div> </footer> </div> <script type="application/json" data-drupal-selector="drupal-settings-json">{"path":{"baseUrl":"\/","pathPrefix":"","currentPath":"node\/185835","currentPathIsAdmin":false,"isFront":false,"currentLanguage":"en"},"pluralDelimiter":"\u0003","suppressDeprecationErrors":true,"ajaxPageState":{"libraries":"eJxdjuuSwjAIhV8ohkfqkIZp45DCBKLbt9fYuqv7B_jO4ZZE3LyhgorKjVpIv4qLsBcNM7VtYsFctgUGnPVhjK6EDT7h5SQ0goUlIV_Md35PaE9c5v9ORV-v-ANG3nWQVIEjBcWGy_Oj1SC3rsjxT4n9WGgr5WC7OVUYl0Mvk6L786BBpa3HSrngl7zR3aZcTBn3OOBywleXNroVuk8zthw_IYzK4BVjldyZHueMhEw","theme":"cernpublic","theme_token":null},"ajaxTrustedUrl":{"\/search\/node":true},"mathjax":{"config_type":1,"config":{"tex2jax":{"inlineMath":[["$","$"],["\$","\$"]],"processEscapes":"true"},"showProcessingMessages":"false","messageStyle":"none"}},"matomo":{"disableCookies":false,"trackMailto":true},"bootstrap":{"forms_has_error_value_toggle":1,"modal_animation":1,"modal_backdrop":"true","modal_focus_input":1,"modal_keyboard":1,"modal_select_text":1,"modal_show":1,"modal_size":"","popover_enabled":1,"popover_animation":1,"popover_auto_close":1,"popover_container":"body","popover_content":"","popover_delay":"0","popover_html":0,"popover_placement":"right","popover_selector":"","popover_title":"","popover_trigger":"click","tooltip_enabled":1,"tooltip_animation":1,"tooltip_container":"body","tooltip_delay":"0","tooltip_html":0,"tooltip_placement":"auto left","tooltip_selector":"","tooltip_trigger":"hover"},"user":{"uid":0,"permissionsHash":"30effdd7d92fd58752f7293da4916e148a53b5e7b0426e8ff61fff31efabda2e"}}</script> <script src="/core/assets/vendor/jquery/jquery.min.js?v=3.7.1"></script> <script src="/core/assets/vendor/underscore/underscore-min.js?v=1.13.6"></script> <script src="/core/assets/vendor/once/once.min.js?v=1.0.1"></script> <script src="/sites/default/files/languages/en_p5SjUX5jHQqdSjFPWYikWHznV7uBLdbvuWpmhxPwWHg.js?smqvgl"></script> <script src="/core/misc/drupalSettingsLoader.js?v=10.2.8"></script> <script src="/core/misc/drupal.js?v=10.2.8"></script> <script src="/core/misc/drupal.init.js?v=10.2.8"></script> <script src="/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.0"></script> <script src="/modules/custom/cern-loading/js/cern_loading.js?smqvgl"></script> <script src="/sites/default/modules/mathjax/js/config.js?v=10.2.8"></script> <script src="/libraries/MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script> <script src="/sites/default/modules/mathjax/js/setup.js?v=10.2.8"></script> <script src="/modules/contrib/matomo/js/matomo.js?v=10.2.8"></script> <script src="/core/misc/progress.js?v=10.2.8"></script> <script src="/themes/contrib/bootstrap/js/misc/progress.js?smqvgl"></script> <script src="/core/assets/vendor/loadjs/loadjs.min.js?v=4.2.0"></script> <script src="/core/misc/debounce.js?v=10.2.8"></script> <script src="/core/misc/announce.js?v=10.2.8"></script> <script src="/core/misc/message.js?v=10.2.8"></script> <script src="/themes/contrib/bootstrap/js/misc/message.js?smqvgl"></script> <script src="/core/misc/ajax.js?v=10.2.8"></script> <script src="/themes/contrib/bootstrap/js/misc/ajax.js?smqvgl"></script> <script src="//framework.web.cern.ch/framework/3.0/js/prism/prism.js"></script> <script src="/sites/default/themes/custom/cernbase/js/cernbase.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernbase/js/components/social-sharing.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernbase/js/components/footer.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernbase/js/views/agenda-views.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernbase/js/views/faq-views.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernbase/js/views/news-views.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernbase/js/views/resources-views.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernbase/js/views/stories-views.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernbase/js/views/taxonomies-views.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernbase/js/views/search-views.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernbase/js/views/common-views.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernbase/js/box-effects.js?smqvgl"></script> <script src="//framework.web.cern.ch/framework/3.0/js/colorbox/jquery.colorbox-min.js"></script> <script src="//framework.web.cern.ch/framework/3.0/js/scroll-magic/ScrollMagic.min.js"></script> <script src="//framework.web.cern.ch/framework/3.0/js/scroll-magic/text-effects.js"></script> <script src="//framework.web.cern.ch/framework/3.0/js/owlcarousel/js/owl.carousel.js"></script> <script src="//framework.web.cern.ch/framework/3.0/js/owlcarousel/js/owl.carousel2.thumbs.js"></script> <script src="/sites/default/themes/custom/cernpublic/js/views_carousel.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernpublic/js/anchor-fix.js?smqvgl"></script> <script src="/sites/default/themes/custom/cernbase/sass/bootstrap/javascripts/bootstrap.min.js?smqvgl"></script> <script src="/themes/contrib/bootstrap/js/drupal.bootstrap.js?smqvgl"></script> <script src="/themes/contrib/bootstrap/js/attributes.js?smqvgl"></script> <script src="/themes/contrib/bootstrap/js/theme.js?smqvgl"></script> <script src="/themes/contrib/bootstrap/js/popover.js?smqvgl"></script> <script src="/themes/contrib/bootstrap/js/tooltip.js?smqvgl"></script> <script src="/modules/custom/cern-components/patterns/molecules/preview-card/js/component-preview-card.js?smqvgl"></script> <script src="/modules/custom/cern-components/patterns/molecules/news-display/js/news-display.component.js?smqvgl"></script> <script src="/modules/custom/cern-toolbar/assets/js/cern_toolbar.js?v=1.x"></script> <script src="/modules/custom/cern-components/patterns/molecules/menu/js/menu.component.js?smqvgl"></script> </body> </html>

CINXE.COM

ATLAS measures Higgs boson’s decay width | CERN