Measurement of the branching fractions for $B^0 \to D_s^{*+}π^-$ and $B^0 \to D_s^{*-}K^+$ decays

Belle Collaboration

paper

Measurement of the branching fractions for $B^{0} \to D_{s}^{+} π^{-}$ and $B^{0} \to D_{s}^{-} K^{+}$ decays

arXiv:0912.2594

Abstract

We present a study of $B^{0} \to D_{s}^{*+} π^{-}$ and $B^{0} \to D_{s}^{*-} K^{+}$ decays based on a sample of $657 \times 1 0^{6}$ $B B ˉ$ events collected with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. We measure the branching fractions to be $B (B^{0} \to D_{s}^{*+} π^{-}) = (1.75 \pm 0.34 \pm 0.17 \pm 0.11) \times 1 0^{- 5}$ and $B (B^{0} \to D_{s}^{*-} K^{+}) = (2.02 \pm 0.33 \pm 0.18 \pm 0.13) \times 1 0^{- 5}, w i t h s i g ni f i c an ceso f 6.1 an d 8.0 s t an d a r dd e v ia t i o n s, r es p ec t i v e l y . T h e f i r s t u n cer t ain t y i ss t a t i s t i c a l, t h eseco n d i s d u e t o t h ee x p er im e n t a l sy s t e ma t i cs, an d t h e t hi r d i s f r o m u n cer t ain t i es in t h e$ D_s^+ $d ec a y b r an c hin g f r a c t i o n s . F r o m o u r m e a s u r e m e n t s, w eo b t ain t h e m os tp r ec i se d e t er mina t i o n so f a r o f$ R_{D^*π} $, w h er e$ R_{D^*π} $i s t h er a t i o b e tw ee nam pl i t u d eso f t h e d o u b l y C abibb o - s u pp r esse dd ec a y$ B^0 \to D^{*+}π^- $an d t h e C abibb o f a v or e d$ B^0 \to D^{*-}π^+$ decay.

6 pages, 2 figures, 2 tables. Submitted to PRD (RC)

Measurement of the branching fractions for B0→Ds∗+​π− and B0→Ds∗−​K+ decays

Abstract

Measurement of the branching fractions for $B^{0} \to D_{s}^{+} π^{-}$ and $B^{0} \to D_{s}^{-} K^{+}$ decays