Observation of B_s to phi gamma and Search for B_s to gamma gamma Decays at Belle

TL;DR

This paper reports the first observation of the B_s to phi gamma decay and a search for B_s to gamma gamma decays using data from the Belle detector, providing new insights into rare B_s meson decays.

Contribution

First observation of B_s to phi gamma decay and a search for B_s to gamma gamma decays at Belle, expanding knowledge of radiative penguin processes.

Findings

First detection of B_s to phi gamma decay

No significant B_s to gamma gamma signal found

Provides upper limits on B_s to gamma gamma branching ratio

Abstract

We search for the radiative penguin decays B_s to phi gamma and B_s to gamma gamma in a 23.6 fb-1 data sample collected at the Upsilon(5S) resonance with the Belle detector at the KEKB e+e- asymmetric-energy collider. We observe for the first time a radiative penguin decay of the B_s meson in the B_s to phi gamma mode. No significant B_s to gamma gamma signal is observed.