Speaker
Description
We report measurement of the $B_s^0$ absolute branching fractions $Br(B_s^0 \to D_s^{\pm} X)$, $Br(B_s^0 \to D^0/\bar{D}^0 X)$, and $Br(B_s^0 \to D^{\pm} X)$. The results are based on a sample of 121.4 fb$^{-1}$ collected at the $\Upsilon(10860)$ resonance by the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We perform full reconstruction of one $B_s^0$ meson in $e^+e^- \to \Upsilon(10860) \to B_s^{*} \bar{B}_s^{*}$ events and measure yields of $D_s^+$, $D^0$, and $D^+$ mesons in the rest of the event. We obtain $Br(B_s^0 \to D_s^{\pm} X)$ = (68.6 $\pm$ 7.2 $\pm$ 4.0)%, $Br(B_s^0 \to D^0/\bar{D}^0 X)$ = (21.5 $\pm$ 6.1 $\pm$ 1.8)%, and $Br(B_s^0 \to D^{\pm} X)$ = (12.6 $\pm$ 4.6 $\pm$ 1.3)%, where the first uncertainty is statistical and the second is systematic. The results for $Br(B_s^0 \to D_s^{\pm} X)$ and $Br(B_s^0 \to D^0/\bar{D}^0 X)$ are compatible with previous Belle measurements, the $Br(B_s^0 \to D^{\pm} X)$ is measured for the first time.
