Search for a light charged Higgs boson decaying to c s-bar in pp collisions at sqrt(s) = 8 TeV

TL;DR

This paper reports a search for a light charged Higgs boson decaying into charm and strange quarks in proton-proton collisions at 8 TeV, using CMS data, setting upper limits on its production rate.

Contribution

First search for a light charged Higgs decaying to c s-bar in pp collisions at 8 TeV with CMS, providing model-independent upper limits on its branching fraction.

Findings

No significant deviation from the standard model observed.

Upper limits on B(t to H+ b) range from 1.2% to 6.5%.

Constraints set for charged Higgs mass between 90 and 160 GeV.

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%.