Triple Gauge Boson Couplings in Rare B and K Decays

Abstract

We examine the sensitivity of flavor changing neutral current (FCNC) processes to anomalous triple gauge boson couplings. We show that in the non-linear realization of the electroweak symmetry breaking sector these processes are very sensitive to two CP conserving anomalous couplings. A clean separation of their effects is possible in the next round of experiments probing $b\to s\gamma$ and $b\to s{\ell }^{+}{\ell }^{-}$ processes, as well as kaon decays such as $K^{+}\to {\pi }^{+}\nu \bar{\nu }$. The obtained sensitivity is found to be competitive with that of direct measurements at high energy colliders. In particular, for one of the $WWZ$ couplings the one-loop FCNC effects are enhanced by a logarithmic dependence on the scale of new physics. We also explore the potential signals of CP violating anomalous triple gauge boson couplings in rare $B$ decays.

Comments: 21 pages, 6 figs. New references, comments added, appendix added. Final version to appear in Phys. Rev. D