{"id":22352,"date":"2026-11-11T14:07:00","date_gmt":"2026-11-11T10:07:00","guid":{"rendered":"https:\/\/eternos974.live\/?p=22352"},"modified":"2026-11-11T01:25:24","modified_gmt":"2026-11-10T21:25:24","slug":"cern-des-indices-dune-desintegration-sur-dix-milliards","status":"publish","type":"post","link":"https:\/\/eternos974.live\/index.php\/2026\/11\/11\/cern-des-indices-dune-desintegration-sur-dix-milliards\/","title":{"rendered":"CERN : des indices d\u2019une d\u00e9sint\u00e9gration sur dix milliards"},"content":{"rendered":"<p><p>L\u2019exp\u00e9rience LHCb au CERN a pr\u00e9sent\u00e9 le 3 novembre 2026 des indices d\u2019une d\u00e9sint\u00e9gration du m\u00e9son Bd en un muon et un antimuon. Le ph\u00e9nom\u00e8ne est pr\u00e9dit environ une fois sur dix milliards de d\u00e9sint\u00e9grations concern\u00e9es. Sa raret\u00e9 en fait un test particuli\u00e8rement sensible des th\u00e9ories physiques.<\/p>\n<h2>Des indices \u00e0 3,2 sigma<\/h2>\n<p>Les donn\u00e9es recueillies en 2024 et 2025 atteignent une significativit\u00e9 de 3,0 sigma. En les combinant avec celles de 2011 \u00e0 2018, les chercheurs obtiennent 3,2 sigma. Ce niveau permet de parler d\u2019indices ; une observation confirm\u00e9e demande d\u2019atteindre le seuil de 5 sigma.<\/p>\n<p>Le r\u00e9sultat est compatible avec le Mod\u00e8le standard. Aucune nouvelle particule ni mati\u00e8re noire n\u2019a \u00e9t\u00e9 d\u00e9couverte dans cette analyse.<\/p>\n<h2>Mesurer le rare pour tester les th\u00e9ories<\/h2>\n<p>Des particules trop lourdes pour \u00eatre produites directement pourraient influencer ce type de d\u00e9sint\u00e9gration. Une mesure plus pr\u00e9cise aide donc \u00e0 limiter les sc\u00e9narios th\u00e9oriques possibles. L\u2019am\u00e9lioration du d\u00e9tecteur et des m\u00e9thodes d\u2019analyse contribue \u00e0 extraire le signal du bruit de fond.<\/p>\n<p>Les prochaines collectes et \u00e9volutions de LHCb doivent permettre de renforcer ces mesures. Le CERN situe l\u2019augmentation majeure li\u00e9e au HiLumi LHC autour de 2030, avec une \u00e9volution suppl\u00e9mentaire de LHCb au milieu de la d\u00e9cennie suivante.<\/p>\n<\/p>\n<h2>Sources<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.numerama.com\/sciences\/2371341-les-physiciens-ont-vu-un-evenement-subatomique-qui-ne-se-produit-quune-fois-sur-10-milliards.html\" target=\"_blank\" rel=\"nofollow noopener\">Source 1<\/a><\/li>\n<li><a href=\"https:\/\/home.cern\/lhcb-finds-evidence-of-one-in-ten-billion-particle-decay\" target=\"_blank\" rel=\"nofollow noopener\">Source 2<\/a><\/li>\n<\/ul>\n<p>\u00c0 tr\u00e8s vite sur <a href=\"https:\/\/eternos974.live\" target=\"_blank\" rel=\"noopener\"><strong>l\u2019EternoStation<\/strong><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>LHCb trouve des indices d\u2019une d\u00e9sint\u00e9gration tr\u00e8s rare du m\u00e9son Bd. Le r\u00e9sultat atteint 3,2 sigma, encore en de\u00e7\u00e0 du seuil d\u2019une observation confirm\u00e9e.<\/p>\n","protected":false},"author":1,"featured_media":22353,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"cybocfi_hide_featured_image":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[393],"tags":[],"class_list":["post-22352","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-infos"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.5 - aioseo.com -->\n\t<meta name=\"description\" content=\"LHCb trouve des indices d\u2019une d\u00e9sint\u00e9gration tr\u00e8s rare du m\u00e9son Bd. 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