# Improved Measurement of Time-Dependent CP Asymmetries and the CP-Odd Fraction in the Decay $B^0 \to D^{*+}D^{*-}$

Abstract : 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) \times 10^{6} BB pairs collected with the Babar detector. We determine the CP-odd fraction to be $0.143\pm0.034\stat\pm0.008\syst$. The time-dependent CP asymmetry parameters are determined to be $C_+ = -0.05\pm 0.14\stat \pm 0.02\syst$ and $S_+ = -0.72 \pm 0.19\stat \pm 0.05\syst$. The non-zero value of the measured $S_+$ indicates the evidence of CP violation at the $3.7 \sigma$ confidence level.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00169748
Contributor : Claudine Bombar <>
Submitted on : Tuesday, September 4, 2007 - 5:06:54 PM
Last modification on : Wednesday, September 16, 2020 - 4:23:12 PM

### Citation

B. Aubert, M. Bona, D. Boutigny, Y. Karyotakis, J.P. Lees, et al.. Improved Measurement of Time-Dependent CP Asymmetries and the CP-Odd Fraction in the Decay $B^0 \to D^{*+}D^{*-}$. Physical Review D, American Physical Society, 2007, 76, pp.111102. ⟨10.1103/PhysRevD.76.111102⟩. ⟨in2p3-00169748⟩

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