Higgs in bosonic channels (CMS)

Università degli Studi & INFN Firenze, via G. Sansone 1, 50019 Sesto Fiorentino ( FI), Italy

^a e-mail: valentina.gori@cern.ch

Published online: 29 May 2015

Abstract

The main Higgs boson decays into bosonic channels will be considered, presenting and discussing results from the latest reprocessing of data collected by the CMS experiment at the LHC, using the full dataset recorded at centre-of-mass energies of 7 and 8 TeV. For this purpose, results from the final Run-I papers for the H → ZZ → 4ℓ, H → γγ and H → WW analyses are presented, focusing on the Higgs boson properties, like the mass, the signal strenght, the couplings to fermions and vector bosons, the spin and parity properties. Furthermore, the Higgs boson width measurement exploiting the on-shell versus the off-shell cross section (in the H → ZZ → 4ℓ and H → ZZ → 2ℓ2ν decay channels) will be shown.

All the investigated properties result to be fully consistent with the SM predictions: the signal strength and the signal strength modifiers are consistent with unity in all the bosonic channels considered; the hypothesis of a scalar particle is strongly favored, against the pseudoscalar or the vector/pseudovector or the spin-2 boson hypotheses (all excluded at 99% CL or higher in the H → ZZ → 4ℓ channel).

The Higgs boson mass measurement from the combination of H → ZZ → 4ℓ and H → γγ channels gives a value m_H = 125.03^+0.26_−0.27 (stat.) ^+0.13_−0.15 (syst.). An upper limit Γ_H < 22 MeV can be put on the Higgs boson width thanks to the new indirect method.