Search for new physics in $B \to K \pi \pi \gamma$ with Belle II data

TL;DR

This paper discusses an amplitude analysis of $B o K_{res} o K \

Contribution

It introduces a method to distinguish decay modes contributing to the final state via CP eigenstates for better new physics constraints.

Findings

Amplitude analysis technique for $B o K_{res} o K \

Enhanced understanding of decay mode contributions to $B^0 o K_S^0 \pi^+ \pi^- \\gamma$.

Framework for future CP-asymmetry measurements at Belle II.

Abstract

The measurement of the time-dependent CP-asymmetry of $B^0 \to K_S^0 \pi^+ \pi^- \gamma$ decays is sensitive to contributions from physics beyond the Standard Model. To translate this measurement into a constraint on new physics, it is necessary to distinguish between decay modes that contribute to the final state via a kaonic resonance that is a CP eigenstate, and those that proceed through non-CP eigenstates. This requires an amplitude analysis of the $B \to K_{res} \gamma \to K \pi^+ \pi^- \gamma$ decay, that is discussed in this article.