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Title

Search for the Standard Model Higgs boson decaying into b b ¯ $$ b\overline{b} $$ produced in association with top quarks decaying hadronically in pp collisions at √s = 8 TeV with the ATLAS detector

CollaborationWith : Ancu, Lucian Stefan / Bilbao De Mendizabal, Javier / Calace, Noemi / Chatterjee, Avishek / Clark, Allan Geoffrey / Coccaro, Andrea / Delitzsch, Chris Malena / Della Volpe, Domenico / Ferrere, Didier / Gadomski, Szymon / Golling, Tobias / Gonzalez Sevilla, Sergio / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / March Ruiz, Luis / Mermod, Philippe / Miucci, Antonio / Nackenhorst, Olaf / Nessi, Marzio / Paolozzi, Lorenzo / Ristic, Branislav / Schramm, Steven / Sfyrla, Anna / Vallecorsa, Sofia / Wu, Xin
Published in Journal of High Energy Physics. 2016, vol. 1605, p. 160-211
Collection SCOAP3
Abstract A search for Higgs boson production in association with a pair of top quarks ( t t ¯ H $$ t\overline{t}H $$ ) is performed, where the Higgs boson decays to b b ¯ $$ b\overline{b} $$ , 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 m H = 125 GeV. Combining all t t ¯ H $$ t\overline{t}H $$ searches carried out by ATLAS at s = 8 $$ \sqrt{s}=8 $$ 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.
Keywords Hadron-Hadron scattering (experiments)
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arXiv: 1604.03812
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ATLAS COLLABORATION. Search for the Standard Model Higgs boson decaying into b b ¯ $$ b\overline{b} $$ produced in association with top quarks decaying hadronically in pp collisions at √s = 8 TeV with the ATLAS detector. In: Journal of High Energy Physics, 2016, vol. 1605, p. 160-211. https://archive-ouverte.unige.ch/unige:84921

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Deposited on : 2016-07-01

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