Radiative Penguin decays at Belle

TL;DR

This paper reports on recent experimental measurements of radiative penguin decays of B mesons at Belle, including branching ratios and CP violation, providing insights into flavor physics and potential new physics beyond the Standard Model.

Contribution

It presents the first measurement of time-dependent CP violation in B^0→K_sρ^0γ and improves existing branching fraction results, advancing the understanding of radiative B decays.

Findings

Precise measurement of inclusive b→sγ branching ratio.

First measurement of time-dependent CP violation in B^0→K_sρ^0γ.

Improved branching fractions for B^0→(ρ,ω)γ with new CP and isospin violation results.

Abstract

We present recent progresses in radiative penguin decays of $B$ meson using a large sample of $B\bar{B}$ pairs recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. We report precise measurement of inclusive $b\to s\gamma$ branching ratio with cut $E_\gamma > 1.7$ GeV, first measurement of time-dependent CP-violation in $B^0\to K_s\rho^0\gamma$, measurement of $B^+\to K^+\eta'\gamma$ branching fraction, and improved branching fraction results for $B^0\to(\rho,\omega)\gamma$ with new CP and isospin violation results in the mode.