{"id":12429,"date":"2022-11-21T10:39:20","date_gmt":"2022-11-21T08:39:20","guid":{"rendered":"https:\/\/igfae.usc.es\/~igfae-old\/?p=12429"},"modified":"2022-11-21T12:33:06","modified_gmt":"2022-11-21T10:33:06","slug":"record-de-precision-na-deteccion-de-desintegracions-de-kaons-en-catro-muons","status":"publish","type":"post","link":"https:\/\/igfae.usc.es\/~igfae-old\/record-de-precision-na-deteccion-de-desintegracions-de-kaons-en-catro-muons\/","title":{"rendered":"Record de precisi\u00f3n na detecci\u00f3n de desintegraci\u00f3ns de ka\u00f3ns en catro mu\u00f3ns"},"content":{"rendered":"

O experimento LHCb est\u00e1 dese\u00f1ado para estudar as part\u00edculas de sabor pesado que conte\u00f1en quarks \u201cb\u201d (chamado beleza) e \u201cc\u201d (chamado encanto). Con todo, grazas \u00e1 gran produci\u00f3n de quarks \u201cs\u201d (estra\u00f1os) no LHC, as\u00ed como \u00e1 capacidade de LHCb de reconstru\u00edr part\u00edculas de baixa enerx\u00eda, o experimento tam\u00e9n \u00e9 capaz de producir resultados precisos en desintegraci\u00f3ns de quarks estra\u00f1os, complementarios aos de experimentos espec\u00edficos como NA62 e KOTO. A colaboraci\u00f3n publicou recentemente un l\u00edmite superior “a escala do bill\u00f3n” da taxa \u00e1 que o ka\u00f3n curto (a part\u00edcula con quark estra\u00f1o K0S) se desintegra en catro mu\u00f3ns (\u03bc, unha part\u00edcula similar ao electr\u00f3n, pero m\u00e1is pesada), sendo o primeiro resultado do LHC que alcanza dita magnitude do un por bill\u00f3n. O mesmo conxunto de datos utilizouse para buscar a desintegraci\u00f3n do ka\u00f3n longo (K0L) tam\u00e9n a catro mu\u00f3ns, producindo a mellor cota superior do mundo na devandita desintegraci\u00f3n, e o primeiro resultado do LHC sobre unha desintegraci\u00f3n de ka\u00f3ns longos.<\/p>\n

Segundo o Modelo Est\u00e1ndar (SM), os mes\u00f3ns K0S (K0L) decaen en catro mu\u00f3ns a unha taxa moi pequena duns poucos 10-14 (10-13). As taxas de desintegraci\u00f3n destes procesos son moi sensibles \u00e1s posibles contribuci\u00f3ns de novas part\u00edculas a\u00ednda por descubrir, como os chamados fot\u00f3ns escuros, que poder\u00edan aumentar ou suprimir significativamente a taxa de desintegraci\u00f3n a trav\u00e9s da interferencia cu\u00e1ntica coa amplitude do SM. A pesar da taxa de produci\u00f3n de mes\u00f3ns K0 sen precedentes no LHC, a realizaci\u00f3n desta procura \u00e9 un reto debido \u00e1 baixa enerx\u00eda dos mu\u00f3ns. O experimento LHCb explota a s\u00faa capacidade \u00fanica para seleccionar, en tempo real, mu\u00f3ns de baixa enerx\u00eda, unha capacidade que mellorou nos \u00faltimos anos grazas \u00e1 versatilidade do seu sistema de selecci\u00f3n de sucesos. A an\u00e1lise utilizou software de aprendizaxe autom\u00e1tica para discriminar as part\u00edculas de longa vida do fondo combinatorio, as\u00ed como un mapa detallado e baseado en datos do material do detector ao redor do punto de interacci\u00f3n. A masa invariante do sistema de catro mu\u00f3ns util\u00edzase como variable de control para separar estatisticamente o sinal potencial do fondo combinatorio restante.<\/p>\n

Non se observou ning\u00fan evento seleccionado consistente coa desintegraci\u00f3n de K0S en catro mu\u00f3ns, que deber\u00eda aparecer na rexi\u00f3n ao redor da masa de K0S de 498 MeV (ver gr\u00e1fico). En ausencia dun sinal, os l\u00edmites superiores das respectivas fracci\u00f3ns de ramificaci\u00f3n establ\u00e9cense en 5,1 \u00d7 10-12 para o modo de desintegraci\u00f3n do K0S e en 2,3 \u00d7 10-9 para o modo do K0L a un nivel de confianza do 90%. Estes resultados representan as procuras m\u00e1is precisas do mundo para estas desintegraci\u00f3ns, e a fracci\u00f3n de ramificaci\u00f3n para K0S \u2192 \u03bc+\u03bc-\u03bc+\u03bc- \u00e9 o l\u00edmite superior m\u00e1is estrito para un modo de desintegraci\u00f3n K0S.\"\"<\/a><\/p>\n

O detector LHCb mellorado, que comezou a tomar datos este ano, ofrece excelentes oportunidades para mellorar a\u00ednda m\u00e1is a precisi\u00f3n da procura e eventualmente atopar evidencia de que esta desintegraci\u00f3n d\u00e1se na natureza. Ademais do aumento da cantidade de datos, a mellora do LHCb ten un disparador totalmente programado, que se espera que mellore significativamente a eficiencia das desintegraci\u00f3ns de K0 en catro mu\u00f3ns e outras desintegraci\u00f3ns con part\u00edculas de estado final con moi baixa enerx\u00eda.<\/p>\n

A an\u00e1lise de datos foi realizado por cient\u00edficos do IGFAE, sendo os autores principais Miguel Fern\u00e1ndez G\u00f3mez e Diego Mart\u00ednez Santos, quen o presentou na conferencia KAON-2022 (Osaka). O estudo foi destacado no bolet\u00edn do CERN Courier deste mes, ao ser a primeira vez que o LHC logra un resultado coa precisi\u00f3n ao nivel do un por bill\u00f3n. Esta precisi\u00f3n foi posible grazas \u00e1s melloras no sistema de selecci\u00f3n de sucesos levadas a cabo polo proxecto Starting Grant ERC-StG-639068.<\/p>\n

Imaxe principal: O investigador predoutoral Miguel Fern\u00e1ndez G\u00f3mez presentando este traballo no KAON-2022.<\/p>\n

Referencias:
\nLHCb Collab. 2022 LHCb-PAPER-2022-035<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

O experimento LHCb est\u00e1 dese\u00f1ado para estudar as part\u00edculas de sabor pesado que conte\u00f1en quarks \u201cb\u201d (chamado beleza) e \u201cc\u201d (chamado…<\/p>\n","protected":false},"author":21,"featured_media":12430,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[103,107],"tags":[],"aioseo_notices":[],"yoast_head":"\nRecord de precisi\u00f3n na detecci\u00f3n de desintegraci\u00f3ns de ka\u00f3ns en catro mu\u00f3ns - IGFAE<\/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:\/\/igfae.usc.es\/~igfae-old\/record-de-precision-na-deteccion-de-desintegracions-de-kaons-en-catro-muons\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Record de precisi\u00f3n na detecci\u00f3n de desintegraci\u00f3ns de ka\u00f3ns en catro mu\u00f3ns\" \/>\n<meta property=\"og:description\" content=\"O experimento LHCb est\u00e1 dese\u00f1ado para estudar as part\u00edculas de sabor pesado que conte\u00f1en quarks \u201cb\u201d (chamado beleza) e \u201cc\u201d (chamado...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/igfae.usc.es\/~igfae-old\/record-de-precision-na-deteccion-de-desintegracions-de-kaons-en-catro-muons\/\" \/>\n<meta property=\"og:site_name\" content=\"IGFAE\" \/>\n<meta property=\"article:published_time\" content=\"2022-11-21T08:39:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-11-21T10:33:06+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/igfae.usc.es\/~igfae-old\/wp-content\/uploads\/2022\/11\/Ts5O5HQo.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Record de precisi\u00f3n na detecci\u00f3n de desintegraci\u00f3ns de ka\u00f3ns en catro mu\u00f3ns\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/igfae.usc.es\/~igfae-old\/wp-content\/uploads\/2022\/11\/Ts5O5HQo.jpeg\" \/>\n<meta name=\"twitter:creator\" content=\"@igfae_hep\" \/>\n<meta name=\"twitter:site\" content=\"@igfae_hep\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Elena Mora Cuesta\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/igfae.usc.es\/~igfae-old\/#website\",\"url\":\"https:\/\/igfae.usc.es\/~igfae-old\/\",\"name\":\"IGFAE\",\"description\":\"Instituto Galego de F\u00edsica de Altas Enerx\u00edas\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/igfae.usc.es\/~igfae-old\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/igfae.usc.es\/~igfae-old\/record-de-precision-na-deteccion-de-desintegracions-de-kaons-en-catro-muons\/#primaryimage\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/igfae.usc.es\/~igfae-old\/wp-content\/uploads\/2022\/11\/Ts5O5HQo.jpeg\",\"contentUrl\":\"https:\/\/igfae.usc.es\/~igfae-old\/wp-content\/uploads\/2022\/11\/Ts5O5HQo.jpeg\",\"width\":1500,\"height\":1000},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/igfae.usc.es\/~igfae-old\/record-de-precision-na-deteccion-de-desintegracions-de-kaons-en-catro-muons\/#webpage\",\"url\":\"https:\/\/igfae.usc.es\/~igfae-old\/record-de-precision-na-deteccion-de-desintegracions-de-kaons-en-catro-muons\/\",\"name\":\"Record de precisi\u00f3n na detecci\u00f3n de desintegraci\u00f3ns de ka\u00f3ns en catro mu\u00f3ns - 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