Obtenção de um limite para a largura do bóson de Higgs no experimento CMS via H→ ZZ → (4e, 4µ, 2e2µ)

We present in this work a study about the Higgs boson total width using the channel H→ ZZ → (4e, 4µ, 2e2µ. According to the Standard Model of Elementary Particle Physics, the Higgs boson with mass around 126 GeV should have a total decay width of ΓH = 4.15 MeV, very below the resolution of the experiments installed at the LHC. This fact prevents a direct measurement on the events of the Higgs resonance. Recently it was proposed limit ΓH from the relationship between the rate of events observed in the resonance and the off-shell regions. Using the package of analysis developed by CMS collaboration was obtained a limit of ΓH < 31.46(12.82)MeV in 95(68.3)% CL combining the data collected by the LHC in pp collisions at √s = 7 TeV (5.1fb-1)and at √s = 8 TeV (19.7fb -1).