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

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 $-0.09 <$ $\cal{A}$ $< 0.42$.