Looking for New Physics in B --> K^* πand B --> ρK Decays

Abstract

B --> K^* πand B --> ρK decays involve the same quark-level processes as B --> πK. Analyzing the measurements of the former decays might be able to shed additional light on the new-physics hints in the current B --> πK data. We perform fits to B --> K^* πand B --> ρK decays, and find that the data can be accommodated within the standard model. However, this agreement is due principally to the large errors in the data, particularly the CP-violating asymmetries. If the errors on the B --> K^* πand B --> ρK observables can be reduced, one will have a clearer sense of whether new physics is present in these decays.