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Time-Dependent CP Violation Effects in Partially Reconstructed B 0 → D ∗ ∓ π ± Decays Belle Collaboration

We report measurements of time-dependent decay rates for B → D∗∓π± decays and extraction of CP violation parameters related to φ3. 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∗∓. The analysis uses 140 fb of data accumulated at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We measure the CP violation parameters S = 0.035±0.041 (stat)±0.018 (syst) and S− = 0.025±0.041 (stat)±0.018 (syst).