Tau-Mu Flavor Violation and the Scale of New Physics

Motivated by the strong experimental evidence of large vμ - vτ neutrino oscillations, we study existing constraints for related μ - τ flavor violation. Using a general bottom-up approach, we construct dimension-6 effective fermionic operators whose coefficients encode the scale of new physics associated with μ - τ flavor violation, which is a piece in the puzzle of the origin of neutrino oscillations. We survey existing experimental bounds on this scale, which arise mostly from τ and B decays. In many cases the new physics scale is constrained to be above a few TeV. We also discuss the operators which are either weakly constrained or, at present, subject to no experimental bounds