Radiative B Meson Decay

TL;DR

This paper reports measurements of radiative B meson decay branching fractions using the Belle detector, providing key experimental data for understanding flavor-changing neutral currents and testing the Standard Model.

Contribution

The study presents new experimental measurements of branching fractions for various radiative B meson decays, including setting an upper limit for B -> rho gamma, enhancing existing data.

Findings

Measured Br(B->K*0(892)γ) = (49.6 ± 6.7 ± 4.5) x 10^{-6}

Set an upper limit for Br(B->ργ)/Br(B->K*0(892)γ) < 0.19 at 90% CL

Provided the first precise measurements of these rare decay modes

Abstract

We studied radiative B meson decays with the Belle detector. We measured the following branching fractions; Br(B->K*0(892)\gamma) = (49.6 \pm 6.7 \pm 4.5) x 10^{-6}, Br(B->K*+(892)\gamma) = (38.9 \pm 9.3 \pm 4.1) x 10^{-6}, Br(B->Xs\gamma) = (3.39 \pm 0.53 \pm 0.42 +0.51-0.55) x 10^{-4}. We also set an upper limit for B -> \rho\gamma as Br(B->\rho\gamma)/Br(B->K*(892)\gamma) < 0.19 at 90% confidence level.