Observation of H → bb̅ decays and VH production with the ATLAS detector

Rimoldi, Marco; Mullier, Geoffrey; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Meloni, Federico; Beck, Hans Peter; Ereditato, Antonio (2018). Observation of H → bb̅ decays and VH production with the ATLAS detector. Physics letters. B, 786, pp. 59-86. Elsevier 10.1016/j.physletb.2018.09.013

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A search for the decay of the Standard Model Higgs boson into a bb̅ pair when produced in association with a W or Z boson is performed with the ATLAS detector. The data, corresponding to an integrated luminosity of 79.8fb⁻¹were collected in proton–proton collisions during Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13 TeV. For a Higgs boson mass of 125 GeV, an excess of events over the expected background from other Standard Model processes is found with an observed (expected) significance of 4.9 (4.3) standard deviations. A combination with the results from other searches in Run 1 and in Run 2 for the Higgs boson in the bb̅ decay mode is performed, which yields an observed (expected) significance of 5.4 (5.5) standard deviations, thus providing direct observation of the Higgs boson decay into b-quarks. The ratio of the measured event yield for a Higgs boson decaying into bb̅ to the Standard Model expectation is 1.01 ± 0.12 (stat.) + 0.16 −0.15 (syst.). Additionally, a combination of Run 2 results searching for the Higgs boson produced in association with a vector boson yields an observed (expected) significance of 5.3 (4.8) standard deviations

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

ISSN:

0370-2693

Publisher:

Elsevier

Language:

English

Submitter:

BORIS Import LHEP

Date Deposited:

14 May 2019 15:12

Last Modified:

24 Oct 2019 16:47

Publisher DOI:

10.1016/j.physletb.2018.09.013

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwaehnt

BORIS DOI:

10.7892/boris.129015

URI:

https://boris.unibe.ch/id/eprint/129015

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