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10.1016-j.physletb.2015.07.079.pdf (1.51 MB)

Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector

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posted on 2023-06-09, 05:53 authored by Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, K Suruliz, Mark SuttonMark Sutton, Iacopo Vivarelli, et al. The ATLAS Collaboration
A search for the associated production of the Higgs boson with a top quark pair is performed in multilepton final states using 20.3 fb-1 of proton–proton collision data recorded by the ATLAS experiment at vs=8 TeV at the Large Hadron Collider. Five final states, targeting the decays H?WW?H?WW?, tt, and ZZ?, are examined for the presence of the Standard Model (SM) Higgs boson: two same-charge light leptons (e or µ) without a hadronically decaying t lepton; three light leptons; two same-charge light leptons with a hadronically decaying t lepton; four light leptons; and one light lepton and two hadronically decaying t leptons. No significant excess of events is observed above the background expectation. The best fit for the tt¯H production cross section, assuming a Higgs boson mass of 125 GeV, is 2.1 -1.2+1.4 times the SM expectation, and the observed (expected) upper limit at the 95% confidence level is 4.7 (2.4) times the SM rate. The p-value for compatibility with the background-only hypothesis is 1.8s; the expectation in the presence of a Standard Model signal is 0.9s.

Funding

ATLAS; G0275; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I006048/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Physics Letters B

ISSN

0370-2693

Publisher

Elsevier

Volume

749

Page range

519-541

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Experimental Particle Physics Research Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-04-26

First Open Access (FOA) Date

2017-04-26

First Compliant Deposit (FCD) Date

2017-04-26

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