Search for New Physics in CP-violating B Decays

We consider three possible scenarios of new physics in B 0 d - ¯ B 0 d mixing and propose a simple framework for analyzing their effects. This framework allows us to study the CP asymmetry in semileptonic B d decays (A SL ) and those in nonleptonic transitions such as B d ! J=/K S and B d ! ß + ß 0 . Numerically we find that new physics may enhance the magnitude of A SL up to the percent level within the appropriate parameter space. So measurements of A SL and its correlation with other CP asymmetries will serve as a sensitive probe for new physics in B 0 d - ¯ B 0 d mixing. PACS number(s): 11.30.Er, 12.15.Ff, 13.25.+m 3 Electronic address: sanda@eken.phys.nagoya-u.ac.jp y Electronic address: xing@eken.phys.nagoya-u.ac.jp 1 Introduction The B-meson factories under construction at KEK and SLAC will provide a unique opportunity to study CP violation in weak B decays. One type of CP -violating signals, arising from B 0 d - ¯ B 0 d mixing, is expected to manifest ..