# 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

Abstract : A search for Higgs boson production in association with a pair of top quarks (tt¯H) is performed, where the Higgs boson decays to bb¯, and both top quarks decay hadronically. The data used correspond to an integrated luminosity of 20.3 fb−1 of pp collisions at s√=8 TeV collected with the ATLAS detector at the Large Hadron Collider. The search selects events with at least six energetic jets and uses a boosted decision tree algorithm to discriminate between signal and Standard Model background. The dominant multijet background is estimated using a dedicated data-driven technique. For a Higgs boson mass of 125 GeV, an upper 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 Standard Model expectation for mH=125 GeV. Combining all tt¯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 Model expectation is obtained at 95% confidence level, with a signal strength μ=1.7±0.8.
Type de document :
Article dans une revue
Journal of High Energy Physics, Springer Verlag (Germany), 2016, 05, pp.160. 〈10.1007/JHEP05(2016)160〉

http://hal.in2p3.fr/in2p3-01302317
Contributeur : Emmanuelle Vernay <>
Soumis le : jeudi 14 avril 2016 - 08:27:22
Dernière modification le : mardi 24 juillet 2018 - 15:46:14

### Citation

G. Aad, S. Albrand, S. Berlendis, C. Camincher, J. Collot, et al.. 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. Journal of High Energy Physics, Springer Verlag (Germany), 2016, 05, pp.160. 〈10.1007/JHEP05(2016)160〉. 〈in2p3-01302317〉

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