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Title: Search for a high-mass Higgs boson decaying to a W boson pair in pp collisions at √s = 8 TeV with the ATLAS detector

Journal Article · · Journal of High Energy Physics (Online)

A search for a high-mass Higgs boson H is performed in the H→WW→ℓνℓν and H→WW→ℓνqq decay channels, using pp collision data corresponding to an integrated luminosity of 20.3 fb-1, collected at √s = 8 TeV by the ATLAS detector at the Large Hadron Collider. No evidence of a high-mass Higgs boson is found. Limits on σH×BR(H→WW) as a function of the Higgs boson mass mH are determined in three different scenarios: one in which the heavy Higgs boson has a narrow width compared to the experimental resolution, one a width increasing with the boson mass and modeled by the complex-pole scheme following the same behavior as in the Standard Model, and one for intermediate widths. The upper range of the search is mH=1500 GeV for the narrow-width scenario and mH=1000 GeV for the other two scenarios. The lower edge of the search range is 200-300 GeV and depends on the analysis channel and search scenario. For each scenario, individual and combined limits from the two WW decay channels are presented. At mH=1500 GeV, the highest mass point tested, σH∙BR(H→WW) for a narrow-width Higgs boson is constrained to be less than 22 fb and 6.6 fb at the 95% CL for the gluon fusion and vector-boson fusion production modes, respectively.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
ATLAS Collaboration
DOE Contract Number:
SC00112704
OSTI ID:
1246822
Report Number(s):
BNL-112036-2016-JA; KA1101021
Journal Information:
Journal of High Energy Physics (Online), Vol. 2016; ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English

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Cited By (9)

Creating the fermion mass hierarchies with multiple Higgs bosons journal December 2016
Collider signatures of flavorful Higgs bosons journal December 2016
Search for anomalous electroweak production of W W / W Z in association with a high-mass dijet system in p p collisions at s = 8 TeV with the ATLAS detector journal February 2017
Benchmarks for double Higgs production in the singlet-extended standard model at the LHC journal August 2017
Light scalar dark matter extension of the type-II two-Higgs-doublet model journal August 2018
Measurement of $$WW/WZ \rightarrow \ell \nu q q^{\prime }$$ W W / W Z → ℓ ν q q ′ production with the hadronically decaying boson reconstructed as one or two jets in pp collisions at $$\sqrt{s} =8~\text {TeV}$$ s = 8 TeV with ATLAS, and constraints on anomalous gauge couplings journal August 2017
Revealing mass-degenerate states in Higgs boson signals journal December 2019
Search for anomalous electroweak production of WW/WZ in association with a high-mass dijet system in pp collisions at √s=8 TeV with the ATLAS detector text January 2017
Collider Signatures of Flavorful Higgs Bosons text January 2016

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