Z' and lepton flavor-violation tau decays

There are many models beyond the standard model predicting the existence of non-universal gauge bosons Z', which can give rise to very rich phenomena. Authors calculate the contributions of the non-universal gauge bosons Z', predicted by topcolor-assisted technicolor (TC2) models and flavor-universal TC2 models, to the lepton flavor-violation tau decays τ→liγ and τ→liljlk. Authors find that the branching ratio Br (τ→liljlk) is larger than that of the process τ→liγ in all of the parameter space. Over a sizable region of the parameter space, authors have Br(τ→liljlk)-10-8, which may be tested in the future experiments