Measurements of time-dependent CP asymmetries in $B\to D^{\ast \mp }{\pi }^{\pm }$ decays using a partial reconstruction technique

Abstract

We report results on time-dependent CP asymmetries in $B\to D^{\ast \mp }{\pi }^{\pm }$ decays based on a data sample containing 657 {\times} $10^6$ $B\bar{B}$ pairs collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider at the ${\rm Y}(4S)$ resonance. We use a partial reconstruction technique, wherein signal $B\to D^{\ast \mp }{\pi }^{\pm }$ events are identified using information only from the fast pion from the B decay and the slow pion from the subsequent decay of the $D^{\ast \mp }$, where the former (latter) corresponds to $D^{\ast +}(D^{\ast -})$ final states. We obtain CP violation parameters $S^{+}=+0.061\pm 0.018(\mathrm{stat})\pm 0.012(\mathrm{syst})$ and $S^{-}=+0.031\pm 0.019(\mathrm{stat})\pm 0.015(\mathrm{syst})$.

8 pages, 5 figures, 2 tables, submitted to Physical Review D (RC)

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