Search for the Standard Model Higgs boson decaying into bb⎯⎯⎯ produced in association with top quarks decaying hadronically in pp collisions at s√=8 TeV with the ATLAS detector

H. WAHLBERG Y ATLAS COLLABORATION

JOURNAL OF HIGH ENERGY PHYSICS - (Online)

springer

Lugar: Trieste; Año: 2016

1029-8479

A search for Higgs boson production in association with a pair of top quarks (t t  ̄ H) is per- ̄ and both top quarks decay hadronically. Theformed, where the Higgs boson decays to b b,√data used correspond to an integrated luminosity of 20.3 fb −1 of pp collisions at s = 8 TeVcollected with the ATLAS detector at the Large Hadron Collider. The search selects eventswith at least six energetic jets and uses a boosted decision tree algorithm to discriminatebetween signal and Standard Model background. The dominant multijet background is es-timated using a dedicated data-driven technique. For a Higgs boson mass of 125 GeV, anupper limit of 6.4 (5.4) times the Standard Model cross section is observed (expected) at 95%confidence level. The best-fit value for the signal strength is μ = 1.6 ± 2.6 times the StandardModelexpectation for m H = 125 GeV. Combining all t t  ̄ H searches carried out by ATLAS at√s = 8 and 7 TeV, an observed (expected) upper limit of 3.1 (1.4) times the Standard Modelexpectation is obtained at 95% confidence level, with a signal strength μ = 1.7 ± 0.8.