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

, The ATLAS collaboration (2016) 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 (5). ISSN 1029-8479

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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 m H = 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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of High Energy Physics
Additional Information:
Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3. Date of Acceptance: 13/05/2016. Evidence of Acceptance on Publisher PDF
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
80191
Deposited By:
Deposited On:
24 Jun 2016 14:28
Refereed?:
Yes
Published?:
Published
Last Modified:
27 Nov 2020 03:54