{"id":3404,"date":"2026-02-24T13:03:17","date_gmt":"2026-02-24T12:03:17","guid":{"rendered":"https:\/\/lpsc-wordpress.in2p3.fr\/?p=3404"},"modified":"2026-02-24T13:03:42","modified_gmt":"2026-02-24T12:03:42","slug":"sur-la-piste-de-la-matiere-noire-au-lpsc-la-recherche-de-particules-au-long-temps-de-vie","status":"publish","type":"post","link":"https:\/\/lpsc-wordpress.in2p3.fr\/?p=3404","title":{"rendered":"Sur la piste de la mati\u00e8re noire : au LPSC, la recherche de particules au long temps de vie"},"content":{"rendered":"\n<figure itemscope itemtype=\"https:\/\/schema.org\/ImageObject\">\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/lpsc-wordpress.in2p3.fr\/wp-content\/uploads\/2026\/02\/collision_credit_atlas_experiment-cern-300x198.png\" alt=\"collision_credit_atlas_experiment-cern\" height=\"198\" width=\"300\" title=\"collision_credit_atlas_experiment-cern\" onerror=\"this.style.display='none'\" loading=\"lazy\" \/>\n\t<\/figure>\n\t<p><em>Exemple de collision proton-proton \u00e0 13.6 TeV enregistr\u00e9e en 2025 \u00a9 ATLAS Experiment &#8211; CERN<\/em><\/p>\n<h2>\n\t\t\tSur la piste de la mati\u00e8re noire : au LPSC, la recherche de particules au long temps de vie\t<\/h2>\n\t<p><em>24 f\u00e9vrier 2026<\/em><\/p>\n\t<p><strong>Invisible, omnipr\u00e9sente et toujours insaisissable : la mati\u00e8re noire reste l&rsquo;une des grandes \u00e9nigmes de la physique. Au LPSC, Marie-H\u00e9l\u00e8ne Genest et son \u00e9quipe explorent une piste originale &#8211; celle des particules au long temps de vie &#8211; \u00e0 travers le projet ANR DMwithLLPatLHC.<\/strong><\/p>\n\t<p>Partager ce contenu<\/p>\n\t\t\t\t\t\t\t\t\t\t<a class= \"uabb-ss-grid-button-link\" href=\"https:\/\/www.linkedin.com\/shareArticle?url=https%3A%2F%2Flpsc-wordpress.in2p3.fr%2F%3Fp%3D3404%26fl_builder\" target=\"_blank\" onclick=\"window.open(this.href,'social-share','left=20,top=20,width=500,height=500,toolbar=1,resizable=0');return false;\">\n\t\t\t\t\t\t\t\tLinkedin\n\t\t\t\t\t\t\t\t\t\t<\/a>\n\t<p>Cat\u00e9gories<\/p>\n\t<p><strong>Un projet n\u00e9 d&rsquo;un angle mort de la recherche<\/strong><\/p>\n<p>Les exp\u00e9riences men\u00e9es autour du LHC au CERN ont d\u00e9j\u00e0 couvert de nombreux sc\u00e9narios th\u00e9oriques pour d\u00e9tecter de nouvelles particules susceptibles d&rsquo;expliquer la mati\u00e8re noire. Mais certaines signatures, bien que pr\u00e9dites par la th\u00e9orie, restaient encore peu ou pas \u00e9tudi\u00e9es.<\/p>\n<p>C&rsquo;est de ce constat qu&rsquo;est n\u00e9 le projet DMwithLLPatLHC, financ\u00e9 par l&rsquo;ANR de 2022 \u00e0 2026 et coordonn\u00e9 par Marie-H\u00e9l\u00e8ne Genest, directrice de recherche CNRS au LPSC. L&rsquo;objectif : s&rsquo;int\u00e9resser sp\u00e9cifiquement aux <strong>particules au long temps de vie<\/strong> &#8211; des objets hypoth\u00e9tiques qui, contrairement \u00e0 la plupart des particules instables, survivraient assez longtemps pour se d\u00e9placer \u00e0 l&rsquo;int\u00e9rieur du d\u00e9tecteur avant de se d\u00e9sint\u00e9grer, parfois \u00e0 plusieurs m\u00e8tres du point de collision.<\/p>\n\t<p><strong>Une vingtaine de scientifiques, deux types de signatures<\/strong><\/p>\n<p>Le projet rassemble une vingtaine de chercheurs et chercheuses, entre Grenoble (LPSC) et Paris (LPNHE, LPTHE), m\u00ealant th\u00e9oriciens, exp\u00e9rimentateurs et sp\u00e9cialistes du d\u00e9tecteur. Cette pluridisciplinarit\u00e9 est une n\u00e9cessit\u00e9 : identifier ces particules demande de ma\u00eetriser \u00e0 la fois les mod\u00e8les th\u00e9oriques, le fonctionnement fin du d\u00e9tecteur ATLAS et des m\u00e9thodes d&rsquo;analyse sp\u00e9cifiques.<\/p>\n<p>L&rsquo;\u00e9quipe s&rsquo;est concentr\u00e9e sur deux types de particules :<\/p>\n<ul>\n<li>Les <strong>particules de type axions<\/strong>, dont la d\u00e9sint\u00e9gration produit deux photons si proches que leurs signaux se superposent dans le d\u00e9tecteur &#8211; les distinguer exige des m\u00e9thodes d&rsquo;analyse complexes dans un environnement \u00e0 fort bruit de fond.<\/li>\n<li>Les <strong>hadrons sombres<\/strong>, dont la production g\u00e9n\u00e9rerait des <em>jets \u00e9mergents<\/em> : des gerbes de particules apparaissant \u00e0 distance du point de collision, avec une partie de l&rsquo;\u00e9nergie visible et une autre \u00ab manquante \u00bb, r\u00e9v\u00e9latrice de particules invisibles.<\/li>\n<\/ul>\n<figure itemscope itemtype=\"https:\/\/schema.org\/ImageObject\">\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/lpsc-wordpress.in2p3.fr\/wp-content\/uploads\/2026\/02\/diagramme_credit_cern.png\" alt=\"diagramme_credit_cern\" height=\"789\" width=\"1000\" title=\"diagramme_credit_cern\" onerror=\"this.style.display='none'\" loading=\"lazy\" \/>\n\t<\/figure>\n\t<p><em>Diagramme montrant la production de deux quarks sombres\u00a0(q_d) formant des jets sombres (les c\u00f4nes, contenant des vertex d\u00e9plac\u00e9s) \u00e0 partir de l&rsquo;interaction de 2 quarks formant un Z&rsquo; (une autre particule hypoth\u00e9tique qui relierait les quarks ordinaires aux quarks sombres)\u00a0\u00a9 2025 CERN for the benefit of the ATLAS Collaboration<\/em><\/p>\n\t<p><strong>Le machine learning au service de la d\u00e9tection<\/strong><\/p>\n<p>Avec pr\u00e8s de 2 milliards de collisions par seconde produites par le LHC, les donn\u00e9es sont massives. L&rsquo;\u00e9quipe s&rsquo;appuie sur des techniques de <em>machine learning<\/em> pour calibrer les jets, identifier les signatures rares et discriminer le signal du bruit de fond.<\/p>\n<p>Un soin particulier a \u00e9t\u00e9 apport\u00e9 \u00e0 la <strong>r\u00e9interpr\u00e9tabilit\u00e9 des r\u00e9sultats<\/strong> : des codes publics ont \u00e9t\u00e9 d\u00e9velopp\u00e9s par les doctorants du projet pour permettre \u00e0 l&rsquo;ensemble de la communaut\u00e9 scientifique de tester de nouveaux sc\u00e9narios th\u00e9oriques \u00e0 partir des donn\u00e9es analys\u00e9es.<\/p>\n<p><strong>Des r\u00e9sultats qui orientent l&rsquo;avenir<\/strong><\/p>\n<p>\u00c0 l&rsquo;approche de sa conclusion, le projet affiche des avanc\u00e9es significatives. L&rsquo;\u00e9quipe a notamment identifi\u00e9 et \u00e9tudi\u00e9 pour la premi\u00e8re fois une <strong>signature compos\u00e9e de deux jets \u00e9mergents<\/strong>, pr\u00e9dite th\u00e9oriquement mais jamais analys\u00e9e auparavant. Les analyses sur les axions ont par ailleurs permis d&rsquo;<strong>exclure certaines r\u00e9gions de param\u00e8tres<\/strong>, pr\u00e9cisant ainsi l\u00e0 o\u00f9 ces particules ne peuvent pas exister.<\/p>\n<p>M\u00eame sans d\u00e9couverte directe, ces r\u00e9sultats balisent le chemin : \u00ab Il faut savoir o\u00f9 ne pas regarder. Le futur nous dira o\u00f9 les exc\u00e8s se trouvent \u00bb, souligne Marie-H\u00e9l\u00e8ne Genest.<\/p>\n<p>Alors que le troisi\u00e8me cycle du LHC s&rsquo;ach\u00e8ve en 2026, l&rsquo;\u00e9quipe se projette d\u00e9j\u00e0 vers le quatri\u00e8me cycle et les futures machines susceptibles de lui succ\u00e9der &#8211; et vers de nouvelles approches globales de d\u00e9tection d&rsquo;anomalies qu&rsquo;ouvre le <em>machine learning<\/em>.<\/p>\n\t<p>\ud83d\udc49 <strong>Lire l&rsquo;article complet sur CNRS Le Journal :<\/strong> <em>Sur la piste de la mati\u00e8re noire : particules au long temps de vie et jets \u00e9mergents<\/em> <a href=\"https:\/\/lejournal.cnrs.fr\/nos-blogs\/focus-sciences\/sur-la-piste-de-la-matiere-noire-particules-au-long-temps-de-vie-et-jets\">https:\/\/lejournal.cnrs.fr\/nos-blogs\/focus-sciences\/sur-la-piste-de-la-matiere-noire-particules-au-long-temps-de-vie-et-jets<\/a><\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>Exemple de collision proton-proton \u00e0 13.6 TeV enregistr\u00e9e en 2025 \u00a9 ATLAS Experiment &#8211; CERN Sur la piste de la mati\u00e8re noire : au LPSC, la recherche de particules au long temps de vie 24 f\u00e9vrier 2026 Invisible, omnipr\u00e9sente et toujours insaisissable : la mati\u00e8re noire reste l&rsquo;une des grandes \u00e9nigmes de la physique. Au&hellip;<\/p>\n","protected":false},"author":2,"featured_media":3405,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"tpl-full-width.php","format":"standard","meta":{"footnotes":""},"categories":[6,1],"tags":[],"class_list":["post-3404","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-non-classe"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sur la piste de la mati\u00e8re noire : au LPSC, la recherche de particules au long temps de vie - LPSC<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lpsc-wordpress.in2p3.fr\/?p=3404\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sur la piste de la mati\u00e8re noire : au LPSC, la recherche de particules au long temps de vie - LPSC\" \/>\n<meta property=\"og:description\" content=\"Exemple de collision proton-proton \u00e0 13.6 TeV enregistr\u00e9e en 2025 \u00a9 ATLAS Experiment &#8211; CERN Sur la piste de la mati\u00e8re noire : au LPSC, la recherche de particules au long temps de vie 24 f\u00e9vrier 2026 Invisible, omnipr\u00e9sente et toujours insaisissable : la mati\u00e8re noire reste l&rsquo;une des grandes \u00e9nigmes de la physique. 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