The constraints of non-standardWWγ couplings from FCNC processes

Abstract

It was reported that the contributions of the non-standardWWγ couplings called λγ and\(\bar \lambda _\gamma \) to the anomalous magnetic moments and the electric dipole moments of fermions depend on regularization schemes of the loop integral. We find that this dependence does not exist in the contributions of the λγ and\(\bar \lambda _\gamma \) couplings to the flavor changing neutral current (FCNC) processes of quarks such asb→sγ. By utilizing the experimental upper bound of the branching ratio of the processB→K*γ, we obtain the allowed regions of λγ and\(\bar \lambda _\gamma \) that do not depend on regularization schemes of the loop integral. The cut-off independent constraints of the other non-standardWWγ couplings called Δκλ and\(\tilde \kappa _\gamma \) are also obtained.