Systematics in charged Higgs search in ATLAS

The chargedMSSMHiggs boson production via t → bH+ and the subsequent decay into H+→ cs̄ or H+→ τ ν has been studied for the ATLAS experiment, for masses lighter than the top quark mass. The first channel, dominating in the low tanβ region (<1), is explored in the final state with four jets, one lepton and missing energy; the second, at higher tan region (>3), is searched in two leptons, two jets and missing energy final state. In both cases, the W boson from the other top quark is required to decay leptonically. The study has been performed using a realistic detector simulation for the signal and the SM backgrounds. The discovery sensitivity and the upper limit onB(t → bH+) as a function of m H, assuming 100% branching ratios for either H + → cs̄ or H+ → τ ν, were discussed for different integrated luminosity and center-of-mass energy scenarios: At √s = 10 TeV and ∫ ℒ dt = 200 pb-1 and at √s = 7 TeV with ∫ ℒ dt = 1 fb-1. The results for the lower center-of-mass energy were obtained from those at higher by means of rescaling cross-sections for the relevant processes. The main focus of the present paper is the impact of systematics on these results. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial- ShareAlike Licence.