Study of (W/Z)H production and Higgs boson couplings using H→ WW* decays with the ATLAS detector

Aad, G.

doi:10.1007/JHEP08(2015)137

Title: Study of (W/Z)H production and Higgs boson couplings using H→ WW* decays with the ATLAS detector

Journal Article · Thu Aug 27 00:00:00 EDT 2015 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP08(2015)137· OSTI ID:1222768

Aad, G. ^[1]

Aix-Marseille Univ. and CNRS/IN2P3, Marseille (France) et al.

A search for Higgs boson production in association with a W or Z boson, in the H→ W W^* decay channel, is performed with a data sample collected with the ATLAS detector at the LHC in proton-proton collisions at centre-of-mass energies √s=7 TeV and 8 TeV, corresponding to integrated luminosities of 4.5 fb^–1 and 20.3 fb^–1, respectively. The WH production mode is studied in two-lepton and three-lepton final states, while two- lepton and four-lepton final states are used to search for the ZH production mode. The observed significance, for the combined WH and ZH production, is 2.5 standard deviations while a significance of 0.9 standard deviations is expected in the Standard Model Higgs boson hypothesis. The ratio of the combined WH and ZH signal yield to the Standard Model expectation, _^μVH, is found to be _^μVH = 3.0_–1.1^+1.3 (stat.)_–0.7^+1.0 (sys.) for the Higgs boson mass of 125.36 GeV. WH and ZH production modes are also combined with the gluon fusion and vector boson fusion production modes studied in the H → W W^* → ℓνℓν decay channel, resulting in an overall observed significance of 6.5 standard deviations and _{μ_ggF+VBF+VH}=1.16_–0.15^+0.16 (stat.) _–0.15^+0.18 (sys.). The results are interpreted in terms of scaling factors of the Higgs boson couplings to vector bosons (κ_V) and fermions (κ_F); the combined results are: |κ_V|=1.06_–0.10^+0.10, |κ_F|=0.85_–0.20^+0.26.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: The ATLAS collaboration; ATLAS Collaboration

Grant/Contract Number:: AC02-06CH11357; AC02-05CH11231; SC00112704; AC03-76SF00515

OSTI ID:: 1222768

Alternate ID(s):: OSTI ID: 1222759; OSTI ID: 1407383

Journal Information:: Journal of High Energy Physics (Online), Vol. 2015, Issue 8; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 38 works

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