Search

The feasibility of detecting a heavy charged Higgs boson,m H±>m t+m b, decaying in theH±?tbchannel is studied with the fast simulation of the ATLAS detector. We study thegg?H± tbproduction process at the LHC which together with the aforementioned decay channel leads to fourb-quarks in the final state. The whole production and decay chain reads. Combinatorial background is a major difficulty in this multi-jet environment but can be overcome by employing multivariate techniques in the event reconstruction. Requiring fourb-tagged jets in the event helps to effectively suppress the Standard Model backgrounds but leads to no significant improvement in the discovery potential compared to analyses requiring only threeb-tagged jets. This study indicates that charged Higgs bosons can be discovered at the LHC up to high masses (m H±>400 GeV) in the case of large tanß.Keywords:charged Higgs; MSSMPACS:14.80.Cp - 12.60.Jv - 11.10.Kk [ABSTRACT FROM AUTHOR]

The sensitivity of the ATLAS detector to the discovery of a heavy charged Higgs boson is presented. Assuming a heavy SUSY spectrum, the most promising channels above the top quark mass are H± → tb and H± → τ±ντ which provide coverage in the low and high tanβ regions up to ∼ 600 GeV. The achievable precisions on the charged Higgs mass and tanβ determination are also discussed. The H± → W± h0 channel, though restricted to a small MSSM parameter space, shows a viable signal in NMSSM where the parameter space is less constrained. The observation of the channel H− → τ− L ντ + c.c. may constitute a distinctive evidence for models with singlet neutrinos in large extra dimensions. [ABSTRACT FROM AUTHOR]