Aubert, B. et al. (2007) Improved measurement of time-dependent CP asymmetries and the CP-odd fraction in the decay B0→D*+D*-. Physical Review D, 76 (11). p. 111102. ISSN 1550-7998

We present an updated measurement of the CP-odd fraction and the time-dependent CP asymmetries in the decay B0→D*+D*- using (383±4)×106BB̅ pairs collected with the BABAR detector. We determine the CP-odd fraction to be 0.143±0.034(stat)±0.008(syst). The time-dependent CP asymmetry parameters are determined to be C+=-0.05±0.14(stat)±0.02(syst) and S+=-0.72±0.19(stat)±0.05(syst). The nonzero value of the measured S+ indicates the evidence of CP violation at the 3.7σ confidence level.

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