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Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector

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posted on 2023-06-09, 15:27 authored by M Aaboud, G Aad, B Abbott, O Abdinov, B Abeloos, D K Abhayasinghe, S H Abidi, O S AbouZeid, N L Abraham, H Abramoqicz, Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, C A Chavez Barajas, Antonella De SantoAntonella De Santo, Samuel Jones, G Lerner, F Miano, Fabrizio SalvatoreFabrizio Salvatore, I Santoyo Castillo, Kate ShawKate Shaw, K Suruliz, Mark SuttonMark Sutton, Fabio Tresoldi, Fabrizio Trovato, Iacopo Vivarelli, E Winkels, O J Winston, The Atlas Collaboration
The observation of Higgs boson production in association with a top quark pair (tt H¯ ), based on the analysis of proton–proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb-1, and considering Higgs boson decays into b¯ b, W W *, t +t -, ?? , and Z Z*, the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the tt H¯ searches using a dataset corresponding to integrated luminosities of 4.5 fb-1 at 7 TeV and 20.3 fb-1 at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total tt H¯ production cross section at 13 TeV is measured to be 670 ± 90 (stat.) +110 -100 (syst.) fb, in agreement with the Standard Model prediction.

History

Publication status

  • Published

File Version

  • Published version

Journal

Physics Letters B

ISSN

0370-2693

Publisher

Elsevier

Volume

784

Page range

173-191

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

2018-10-12

First Open Access (FOA) Date

2018-10-12

First Compliant Deposit (FCD) Date

2018-10-11

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