Time-Dependent CP Violation Effects in Partially Reconstructed $B^0 \to D^* π$ Decays

Details Time-Dependent CP Violation Effects in Partially Reconstructed $B^0 \to D^* π$ Decays Time-Dependent CP Violation Effects in Partially Reconstructed $B^0 \to D^* π$ Decays

2004-08-23

arxiv.org/abs/hep-ex/0408106v3

Phys.Lett.B624:11-21,2005

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 5 figures. To appear in Physics Letters B

Scientific paper

10.1016/j.physletb.2005.07.020

We report measurements of time-dependent decay rates for $B^0 \to D^{*\mp} \pi^\pm$ decays and extraction of CP violation parameters related to $\phi_3$. We use a partial reconstruction technique, whereby signal events are identified using information only from the primary pion and the charged pion from the decay of the $D^{*\mp}$. The analysis uses $140 {\rm fb}^{-1}$ of data accumulated at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. We measure the CP violation parameters $S^+ = 0.035 \pm 0.041 ({\rm stat}) \pm 0.018 ({\rm syst})$ and $S^- = 0.025 \pm 0.041 ({\rm stat}) \pm 0.018 ({\rm syst})$.

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