Transverse τ polarization in B < inf > c < /inf > → τν̄ < inf > tau; < /inf > γ decay

Abstract

The possible transverse polarization of the τ-lepton, which is T-odd and can be used to measure CP-violation, is estimated precisely in the radiative decay mode Bc → τν̄tau;γ with possible parameters for the multi Higgs doublet model and the R-parity violating supersymmetric model. We find that the up-bound of the transverse polarization with possible parameters in the models is at very different levels, i.e. it can be ≤15 ∼ 23% for the former but ≤0.1% for the latter, and it will be accessible experimentally soon.