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

Abstract

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 μggF+VBF+VH=1.16–0.15+0.16 (stat.) –0.15+0.18 (sys.). The results are interpreted in terms of scalingmore » factors of the Higgs boson couplings to vector bosons (κV) and fermions (κF); the combined results are: |κV|=1.06–0.10+0.10, |κF|=0.85–0.20+0.26.« less

Authors:
 [1]
  1. Aix-Marseille Univ. and CNRS/IN2P3, Marseille (France) et al.
Publication Date:
Research Org.:
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 Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
The ATLAS collaboration; ATLAS Collaboration
OSTI Identifier:
1222768
Alternate Identifier(s):
OSTI ID: 1222759; OSTI ID: 1407383
Grant/Contract Number:  
AC02-06CH11357; AC02-05CH11231; SC00112704; AC03-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 8; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Hadron-Hadron Scattering; Higgs physics

Citation Formats

Aad, G. Study of (W/Z)H production and Higgs boson couplings using H→ WW* decays with the ATLAS detector. United States: N. p., 2015. Web. doi:10.1007/JHEP08(2015)137.
Aad, G. Study of (W/Z)H production and Higgs boson couplings using H→ WW* decays with the ATLAS detector. United States. https://doi.org/10.1007/JHEP08(2015)137
Aad, G. 2015. "Study of (W/Z)H production and Higgs boson couplings using H→ WW* decays with the ATLAS detector". United States. https://doi.org/10.1007/JHEP08(2015)137. https://www.osti.gov/servlets/purl/1222768.
@article{osti_1222768,
title = {Study of (W/Z)H production and Higgs boson couplings using H→ WW* decays with the ATLAS detector},
author = {Aad, G.},
abstractNote = {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 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 (κV) and fermions (κF); the combined results are: |κV|=1.06–0.10+0.10, |κF|=0.85–0.20+0.26.},
doi = {10.1007/JHEP08(2015)137},
url = {https://www.osti.gov/biblio/1222768}, journal = {Journal of High Energy Physics (Online)},
issn = {1029-8479},
number = 8,
volume = 2015,
place = {United States},
year = {Thu Aug 27 00:00:00 EDT 2015},
month = {Thu Aug 27 00:00:00 EDT 2015}
}

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