Study of the spin and parity of the Higgs boson in diboson decays with the ATLAS detector

, The ATLAS collaboration (2015) Study of the spin and parity of the Higgs boson in diboson decays with the ATLAS detector. European Physical Journal C: Particles and Fields, 75 (10). ISSN 1434-6044

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Abstract

Studies of the spin, parity and tensor couplings of the Higgs boson in the H→ZZ∗→4ℓ, H→WW∗→eνμν and H→γγ decay processes at the LHC are presented. The investigations are based on 25fb−1 of pp collision data collected by the ATLAS experiment at √s=7 TeV and √s=8 TeV. The Standard Model (SM) Higgs boson hypothesis, corresponding to the quantum numbers JP=0+, is tested against several alternative spin scenarios, including non-SM spin-0 and spin-2 models with universal and non-universal couplings to fermions and vector bosons. All tested alternative models are excluded in favour of the SM Higgs boson hypothesis at more than 99.9 % confidence level. Using the H→ZZ∗→4ℓ and H→WW∗→eνμν decays, the tensor structure of the interaction between the spin-0 boson and the SM vector bosons is also investigated. The observed distributions of variables sensitive to the non-SM tensor couplings are compatible with the SM predictions and constraints on the non-SM couplings are derived.

Item Type:
Journal Article
Journal or Publication Title:
European Physical Journal C: Particles and Fields
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2200/2201
Subjects:
ID Code:
78027
Deposited By:
Deposited On:
28 Jan 2016 10:08
Refereed?:
Yes
Published?:
Published
Last Modified:
25 Oct 2020 03:46