CP violation in the semileptonic B₁₄ decays (B^±→π⁺π^-l ^±v)

Direct CP violations in B4 decays (B--→π⁺π /±i';) are investigated within the standard model (SM) and also in its extensions. In the decay processes, we include various excited states as intermediate states decaying to the final hadrons π⁺-f π-. The CP violation within the SM is induced by the interferences between intermediate resonances with different quark flavors. As extensions of the SM, we consider CP violations implemented through complex scalar-fermion couplings in the multi-Higgs doublet model and the scalarleptoquark models. We calculate the CP-odd rate asymmetry and the optimal asymmetry. We find that the optimal asymmetry can be measured at the 1 <r level with about 109.S-meson pairs in the SM case and 103-107 pairs in the extended model case, for maximally allowed values of CP-odd parameters in each case.