G. Kole

We present results on the search for a light charged Higgs boson that can be produced in the decay of a top quark and later decays into a charm and an antistrange quark. The analysis is performed using $19.7\invfb$ pp collison data recorded with the CMS detector at LHC.

A search for a light charged Higgs boson, originating from the decay of a top quark and subsequently decaying into a charm and an antistrange quark, is presented. The analysed data correspond to an integrated luminosity of 19.7 fb$^{-1}$ recorded in proton-proton collisions at a center-of-mass energy of $\sqrt{s}$ = 8 TeV by the CMS experiment at the LHC. The search is conducted in the decays of the top-antitop quark pairs tt → W±bH∓ b with the W decaying to a lepton (electron or muon) and a neutrino and the H boson decaying to cs . The decay final state comprises an isolated lepton, at least four jets and large missing transverse energy. No significant deviation is found with respect to standard model predictions, and model-independent upper limits are set on the branching fraction B(t → H+b) in the range of 1.2-6.5% for a charged Higgs boson mass between 90 and 160 GeV, under the assumption that B(H+ → cs )=100%.