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

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

2011-02-04

arxiv.org/abs/1102.0888v1

Phys.Rev.D84:021101,2011

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1103/PhysRevD.84.021101

We report results on time-dependent CP asymmetries in $B \to D^{*\mp}\pi^{\pm}$ 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 $\Upsilon(4S)$ resonance. We use a partial reconstruction technique, wherein signal $B \to D^{*\mp}\pi^{\pm}$ events are identified using information only from the fast pion from the B decay and the slow pion from the subsequent decay of the $D^{*\mp}$, where the former (latter) corresponds to $D^{*+} (D^{*-})$ final states. We obtain CP violation parameters $S^+ = +0.061 \pm 0.018(\mathrm{stat}) \pm 0.012(\mathrm{syst})$ and $S^- = +0.031 \pm 0.019(\mathrm{stat}) \pm 0.015(\mathrm{syst})$.

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