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

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (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, 2016(5) Springer 10.1007/JHEP05(2016)160

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A search for Higgs boson production in association with a pair of top quarks (ttH) 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 ttH 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 (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Haug, Sigve; Weber, Michael and Beck, Hans Peter

Subjects:

500 Science > 530 Physics
500 Science > 510 Mathematics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

08 Aug 2017 12:26

Last Modified:

13 Aug 2017 02:15

Publisher DOI:

10.1007/JHEP05(2016)160

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.99963

URI:

https://boris.unibe.ch/id/eprint/99963

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