Search for t t ¯ H production in the H → b b ¯ decay channel with leptonic t t ¯ decays in proton-proton collisions at √s=13 TeV

A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (t¯tH), in which the Higgs boson decays into a b quark-antiquark pair, in proton-proton collisions at a centre-of-mass energy √ s = 13 TeV.The data correspond to an integrated luminosi...

ver descrição completa

Detalhes bibliográficos
Autores: Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo Anoro, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R.
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2019
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/213712
Acesso em linha:http://hdl.handle.net/10261/213712
Access Level:Acceso aberto
Palavra-chave:Hadron-Hadron scattering (experiments)
Higgs physics
Top physics
Descrição
Resumo:A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair (t¯tH), in which the Higgs boson decays into a b quark-antiquark pair, in proton-proton collisions at a centre-of-mass energy √ s = 13 TeV.The data correspond to an integrated luminosity of 35.9 fb−1 recorded with the CMS detector at the CERN LHC. Candidate t¯tH events are selected that contain either one or two electrons or muons from the t¯t decays and are categorised according to the number of jets. Multivariate techniques are employed to further classify the events and eventually discriminate between signal and background. The results are characterised by an observed t¯tH signal strength relative to the standard model cross section, µ = σ/σSM, under the assumption of a Higgs boson mass of 125 GeV. A combined fit of multivariate discriminant distributions in all categories results in an observed (expected) upper limit on µ of 1.5 (0.9) at 95% confidence level, and a best fit value of 0.72±0.24(stat)±0.38(syst), corresponding to an observed (expected) signal significance of 1.6 (2.2) standard deviations above the background-only hypothesis.

Registros relacionados