  The charged Higgs decay in the channel H^- ->tau_L^- nu in models with a
singlet neutrino can provide a test of large extra dimensions models with TeV
scale quantum gravity since in the standard two Higgs doublet model type II,
H^- -> tau_L^- nu is suppressed. In the present study, we focus on the decay
H^- -> tau_L^- nu at the LHC for Higgs masses larger than the top-quark mass.
