CP Violation in the Semileptonic $B_{l4}$ ($B->D\ddot{I}€l\hat{I}½$) Decays: Multi-Higgs Doublet Model and Scalar-Leptoquark Models

Abstract

CP violation from physics beyond the Standard Model is investigated in $B_{l4}$ decays: $B\to D\ddot{I}€l\bar{\hat{I}}{½}_l$. In the decay process, we include various excited states as intermediate states decaying to the final hadrons, $D+\ddot{I}€$. We consider the semileptonic decay to a tau lepton family as well. The CP violation is implemented through complex scalar--fermion couplings in the multi-Higgs doublet model and scalar-leptoquark models beyond the Standard Model. With these complex couplings, we calculate the CP-odd rate asymmetry and the optimal asymmetry. We find that for $B_{\ddot{I}„4}$ decays the optimal asymmetry is sizable and can be detected at $1\ddot{I}ƒ$ level with about $10^6$-$10^7$ $B$-meson pairs, for maximally-allowed values of CP-odd parameters in those extended models.

17 pages, Latex, 1 figure included