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Abstract
We report a measurement of the CP-odd fraction and the time-dependent CP violation in B0→D*+D*− decays, using 657×106 BB¯ events collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We measure a CP-odd fraction of R⊥=0.125±0.043(stat)±0.023(syst). From the distributions of the proper-time intervals between a B0→D*+D*− decay and the other B meson in the event, we obtain evidence of CP violation with measured parameters AD*+D*−=0.15±0.13(stat)±0.04(syst) and SD*+D*−=−0.96±0.25(stat)−0.16+0.13(syst).Received 26 January 2009DOI:https://doi.org/10.1103/PhysRevD.80.111104©2009 American Physical Society
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