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10.1007-JHEP08(2015)137.pdf (1.52 MB)

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

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posted on 2023-06-09, 05:56 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 Higgs boson production in association with a W or Z boson, in the H?WW* 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 vs=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. The WH and ZH production modes are also combined with the gluon fusion and vector boson fusion production modes studied in the H ? WW* ? l?l? decay channel, resulting in an overall observed significance of 6.5 standard deviations and µggF?+?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 (?V) and fermions (?F); the combined results are: |?V|?=?1.06-?0.10+?0.10, |?F|?=?0.?85-?0.20+?0.26.

Funding

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

History

Publication status

  • Published

File Version

  • Published version

Journal

Journal of High Energy Physics

ISSN

1029-8479

Publisher

Springer Verlag

Issue

137

Volume

2015

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

2017-04-27

First Open Access (FOA) Date

2017-04-27

First Compliant Deposit (FCD) Date

2017-04-27

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