Abstract
A search for a light charged Higgs boson, originating from the decay of a top quark and subsequently decaying into a charm quark and a strange antiquark, is presented. The data used in the analysis correspond to an integrated luminosity of 19.7 inverse femtobarns recorded in proton-proton collisions at sqrt(s) = 8 TeV by the CMS experiment at the LHC. The search is performed in the process t t-bar to W+/- b H-/+ b-bar, where the W boson decays to a lepton (electron or muon) and a neutrino. The decays lead to a final state comprising an isolated lepton, at least four jets and large missing transverse energy. No significant deviation is observed in the data with respect to the standard model predictions, and model-independent upper limits are set on the branching fraction B(t to H+ b), ranging from 1.2 to 6.5% for a charged Higgs boson with mass between 90 and 160 GeV, under the assumption that B(H+ to c s-bar) = 100%.
Highlights
Event selectionFor the muon+jets final state, events are selected at the trigger level using an isolated single muon with pT > 24 GeV and |η| < 2.1
Background estimationMost of the backgrounds coming from tt, W+jets, Z+jets, single top quark and diboson processes are estimated from simulated samples normalized to NNLO predictions
No significant deviation is observed in the data with respect to the standard model predictions, and model-independent upper limits are set on the branching fraction B(t → H+b), ranging from 1.2 to 6.5% for a charged Higgs boson with mass between 90 and 160 GeV, under the assumption that B(H+ → cs) = 100%
Summary
For the muon+jets final state, events are selected at the trigger level using an isolated single muon with pT > 24 GeV and |η| < 2.1. Ich, Iγ, and Inh are the sum of transverse energies√for charged hadrons, photons, and neutral hadrons, respectively, in a cone size of ∆R = (∆η)2 + (∆φ)2 = 0.4 around the muon direction, and IcPhU is the pT sum of charged hadrons associated to all pileup vertices The latter term is used to estimate the contribution of neutral particles from the pileup events. √ by CMS at s = 8 TeV [43] These factors are applied to the simulated SM tt and signal samples before any event selection is required
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