Constraints on new physics from radiative $B$ decays

TL;DR

This paper reviews recent experimental measurements of radiative B decays, analyzes their implications for new physics, and discusses the impact of these results on constraining beyond Standard Model theories.

Contribution

It provides a critical review of hadronic uncertainties and assesses how recent measurements influence new physics constraints in $b o s\,gamma$ transitions.

Findings

Recent measurements of $B_s\to\phi\gamma$ branching ratio and asymmetry impact new physics constraints.

Angular distribution data at low $q^2$ provides additional sensitivity to new physics.

Hadronic uncertainties remain a key challenge in interpreting radiative decay measurements.

Abstract

A new phase for the measurements of radiative decay modes in $b \to s$ transitions has started with new measurements of exclusive modes by LHCb and with Belle-II showing distinctive promises in both inclusive and exclusive channels. After critically reviewing the hadronic uncertainties in exclusive radiative decays, we analyze the impact of recent measurements of the branching ratio and mass-eigenstate rate asymmetry in $B_s\to\phi\gamma$ and of the angular distribution of $B\to K^*e^+e^-$ at low $q^2$ on new physics in the $b\to s\gamma$ transition.