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

Aad, G.; Abdallah, J.; Chelkov, G. A.; Abbott, B.

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

Aad, G., Abdallah, J., Chelkov, G. A., Abbott, B.

Дата публикации: 2015

Дата публикации в реестре: 2020-03-03T18:30:49Z

Аннотация:

Studies of the spin, parity and tensor couplingsof the Higgs boson in the H → ZZ∗ → 4, H → WW∗ → eνμν and H → γγ decay processes at the LHC are presented. The investigations 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, сorresponding to the quantum numbers J P = 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∗ → 4 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.

Ключевые слова:
ATLAS, детектор, Большой адронный коллайдер, Хиггса бозон

Тип: статьи в журналах

Источник: The European physical journal C. 2015. Vol. 75, № 10. P. 476 (1-36)