INVESTIGADORES
MONTICELLI Fernando Gabriel
artículos
Título:
Study of (W/Z)H production and Higgs boson couplings using H→WW∗ decays with the ATLAS detector
Autor/es:
FERNANDO MONTICELLI; ATLAS COLLABORATION
Revista:
JOURNAL OF HIGH ENERGY PHYSICS
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2015 vol. 1 p. 1 - 20
ISSN:
1126-6708
Resumen:
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 W H 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 W H and ZH signal yield to the Standard Model expectation, μVH , is found to be μVH  = 3.0+ 1.3− 1.1 (stat.)+ 1.0− 0.7 (sys.) for the Higgs boson mass of 125.36 GeV. The W H 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+ 0.16− 0.15 (stat.)+ 0.18− 0.15 (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+ 0.26− 0.20 .