$b\to s\gamma$ Branching Fraction and CP Asymmetry

TL;DR

This paper reports on measurements of the $b o s \gamma$ decay branching fraction and CP asymmetry from the CLEO experiment, providing updated results and limits on CP violation in these decays.

Contribution

The paper presents the first updated measurement of the $b o s \gamma$ branching fraction and a new analysis setting limits on CP asymmetry in these decays.

Findings

Branching fraction: $(3.15 \pm 0.35 \pm 0.32 \pm 0.26) imes 10^{-4}$

No observed CP asymmetry, limits set at $-0.09 < \mathcal{A} < 0.42$

Results are consistent with Standard Model predictions.

Abstract

We present preliminary results on $b \to s \gamma$ from the CLEO experiment. An updated result on the branching fraction is reported at $\cal{B}$$(b \to s \gamma) = (3.15 \pm 0.35 \pm 0.32 \pm 0.26)\times 10^{-4}$, where the first uncertainty is statistical, the second is systematic, and the third for model dependence. We also describe a new analysis performed to search for CP asymmetry in $b \to s \gamma$ decays. We observe no such asymmetry and set conservative limits at $-0.09 <$ $\cal{A}$ $< 0.42$.