Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector
Here, the observation of Higgs boson production in association with a top quark pair ( $$ t\overline{t}\ $$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 $$ b\overline{b}\ $$, WW*, τ+τ-, γγ, and ZZ*, the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the $$ t\overline{t}\ $$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 $$ t\overline{t}\ $$H production cross section at 13 TeV is measured to be 670 ± 90 (stat.) (syst.) fb, in agreement with the Standard Model prediction.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States); Harvard Univ., Cambridge, MA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- The ATLAS Collaboration
- Grant/Contract Number:
- AC02-05CH11231; SC0007859; SC0007881
- OSTI ID:
- 1461586
- Alternate ID(s):
- OSTI ID: 1492326; OSTI ID: 1639172; OSTI ID: 1730934
- Journal Information:
- Physics Letters B, Journal Name: Physics Letters B Vol. 784 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
Web of Science
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