Looking for New Physics in B --> K^* \pi and B --> \rho K Decays

TL;DR

This paper investigates B meson decays involving K^*  and  particles to explore potential new physics signals, finding current data compatible with the standard model due to large uncertainties, but future precision could reveal new physics.

Contribution

The study performs fits to B --> K^*  and B -->  decays, highlighting the importance of reducing experimental errors to better detect possible new physics effects.

Findings

Current data compatible with the standard model due to large errors.

Reducing measurement uncertainties could clarify the presence of new physics.

Analysis emphasizes the need for more precise CP asymmetry measurements.

Abstract

B --> K^* \pi and B --> \rho K decays involve the same quark-level processes as B --> \pi K. Analyzing the measurements of the former decays might be able to shed additional light on the new-physics hints in the current B --> \pi K data. We perform fits to B --> K^* \pi and B --> \rho K 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^* \pi and B --> \rho K observables can be reduced, one will have a clearer sense of whether new physics is present in these decays.