Background Estimations in the Higgs to Four Leptons Decay Channel - A Study of Fake Lepton Efficiencies

We present fake muon and electron efficiencies in the H->ZZ(*)->4l channel calculated using the LHC data obtained during the month July 2015 corresponding to an integrated luminosity of 85 nb-1. Given its low background and fully reconstructable final state, this channel is valuable for searches and measurements of the Higgs boson properties. Efficiencies are presented in control regions enhanced in light jets and conversion photons in the case of electrons, as well as in regions defined using cuts on the isolation and d0 significance variables in the case of both muons and electrons. These results will be used to extrapolate the light jets and photons contaminations in the signal region once more statistics are available.