Search for the standard model Higgs boson produced in association with top quark and decaying into a bb̄ pair in pp collisions at √s = 13 TeV with the ATLAS detector

• Autores: Alconada Verzini, María Josefina; Alonso, Francisco; Arduh, Francisco Anuar; Dova, María Teresa; Hoya, Joaquín; Monticelli, Fernando Gabriel; Wahlberg, Hernán Pablo; The ATLAS Collaboration
• Año de publicación: 2018
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Física; Spontaneous symmetry breaking; Higgs bosons; Top quark
• Institución: Universidad Nacional de La Plata

A search for the standard model Higgs boson produced in association with a top-quark pair, tt̄H, is presented. The analysis uses 36.1 fb−1 of pp collision data at √s = 13 TeV collected with the ATLAS detector at the Large Hadron Collider in 2015 and 2016. The search targets the H → bb̄ decay mode. The selected events contain either one or two electrons or muons from the top-quark decays, and are then categorized according to the number of jets and how likely these are to contain b-hadrons. Multivariate techniques are used to discriminate between signal and background events, the latter being dominated by tt̄ + jets production. For a Higgs boson mass of 125 GeV, the ratio of the measured tt̄H signal cross-section to the standard model expectation is found to be μ = 0.84 ± 0.64 − 0.61. A value of μ greater than 2.0 is excluded at 95% confidence level (C.L.) while the expected upper limit is μ < 1.2 in the absence of a tt̄H signal.
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Instituto de Física La Plata