b Institute for High Energy Physics, Protvino, Moscow Region, 142284, Russia
Abstract:
We study the contribution of Bc mesons to the search for B → τντ decays. We find that at LEP the contributions from Bu and Bc mesons can be comparable. This observation can have a relevant impact on the extraction of constraints on new physics (such as charged-Higgs contributions) from current LEP limits on B → τν final states. Inclusion of the Bc contribution can reduce the current L3 limit on tan β/MH from 0.38 GeV?1 (90% CL) down to 0.27 GeV?1 (90% CL).