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

Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Aben, R. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2015) Study of the spin and parity of the Higgs boson in diboson decays with the ATLAS detector. EUROPEAN PHYSICAL JOURNAL C, 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 invest- igations are based on 25 fb−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, corres- ponding 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 sens- itive to the non-SM tensor couplings are compatible with the SM predictions and constraints on the non-SM couplings are derived.

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