Detecting heavy charged Higgs bosons at the CERN LHC with four b-quark tags - art. no. 055011

We investigate the signature of a heavy charged Higgs boson of the minimal super-symmetric standard model in the lepton plus multijet channel at the C ERN Large Hadron Collider with four b tags. The signal is the gluon-gluon f usion process gg-->t (b) over bar H-, followed by the H--->(t) over bar b d ecay, while the main background is from gg-->t (t) over bar b (b) over bar. We find that the two can be separated effectively by kinematic cuts and ma ss reconstruction, but the signal size is not very large in the end. Noneth eless, with a good b-tagging efficiency epsilon(b)similar to 50%, this chan nel can provide a viable signature over a limited but interesting range of the parameter space.