Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector

The observation of Higgs boson production in association with a top quark pair ( tt¯H ), based on the analysis of proton?proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated lumi...

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Detalles Bibliográficos
Autores: Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Alconada Verzini, María Josefina, Alonso, Francisco, Arduh, Francisco Anuar, Dova, Maria Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Wahlberg, Hernan Pablo, Bossio Sola, Jonathan David, Daneri, María Florencia, Devesa, Maria Roberta, Marceca, Gino, Otero y Garzon, Gustavo Javier, Piegaia, Ricardo Nestor, Sacerdoti, Sabrina, Zinonos, Z., Zinser, M., Ziolkowski, M., Živković, L., Zobernig, G., Zoccoli, A., Zoch, K., Nedden, M. zur, Zorbas, T. G., Zou, R., Zwalinski, L., The ATLAS Collaboration
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2018
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/120482
Acceso en línea:http://hdl.handle.net/11336/120482
Access Level:acceso abierto
Palabra clave:ATLAS
STANDARD MODEL
HIGGS
TOP
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
Descripción
Sumario:The observation of Higgs boson production in association with a top quark pair ( tt¯H ), based on the analysis of proton?proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb −1 , and considering Higgs boson decays into bb¯ , WW⁎ , τ+τ− , γγ , and ZZ⁎ , the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the tt¯H searches using a dataset corresponding to integrated luminosities of 4.5 fb −1 at 7 TeV and 20.3 fb −1 at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total tt¯H production cross section at 13 TeV is measured to be 670 ± 90 (stat.) −100+110 (syst.) fb, in agreement with the Standard Model prediction.

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