An analysis of B_{d,s} mixing angles in presence of New Physics and an update of Bs -> K0* anti-K0*

TL;DR

This paper proposes a straightforward method to measure the mixing angles of Bs and Bd mesons in the presence of New Physics, providing bounds on CP asymmetries and an updated prediction for a specific decay mode, with implications for experimental searches.

Contribution

It introduces a new expression for directly measuring New Physics mixing angles and applies it to various B decay modes, updating predictions and bounds within a unified framework.

Findings

New method for measuring mixing angles in presence of New Physics

Stringent bounds on direct CP asymmetries in B decays

Updated prediction for Bs->K0* anti-K0* branching ratio

Abstract

We discuss a simple approach to measure the weak mixing angles phi_s and phi_d of the Bs and Bd systems in the presence of New Physics. We present a new expression that allows one to measure directly the New Physics mixing angles if New Physics contributes significantly to the mixing only. We apply the method to specific penguin-mediated B->PP, B->PV and B ->VV modes. We provide a very stringent and simple bound on the direct CP asymmetries of all these modes, the violation of which is a signal of New Physics in decay. Within the same theoretical framework, an updated prediction for the branching ratio of Bs->K0* anti-K0* is presented, which can be compared with a recent LHCb analysis.