Search for a light charged Higgs boson in the decay channel H+->csbar in ttbar events using pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

TL;DR

This paper reports a search for a light charged Higgs boson in top quark decays using 7 TeV proton-proton collision data from the ATLAS detector, setting upper limits on the decay branching ratio.

Contribution

It introduces a novel search for H+->csbar in ttbar events at the LHC, providing the first limits in this decay channel for H+ masses between 90 and 150 GeV.

Findings

No signal observed, leading to upper limits on branching ratios.

Limits vary between 5% and 1% for H+ masses 90-150 GeV.

Assumes Br(H+->csbar)=100% for setting limits.

Abstract

A search for a charged Higgs boson (H+) in ttbar decays is presented, where one of the top quarks decays via t->H+b, followed by H+->two jets (csbar). The other top quark decays to Wb, where the W boson then decays into a lepton (e/mu) and a neutrino. The data were recorded in pp collisions at sqrt(s) = 7TeV by the ATLAS detector at the LHC in 2011, and correspond to an integrated luminosity of 4.7 fb-1. With no observation of a signal, 95% confidence level (CL) upper limits are set on the decay branching ratio of top quarks to charged Higgs bosons varying between 5% and 1% for H+ masses between 90 GeV and 150 GeV, assuming Br(H+->csbar)=100%.