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We present an updated measurement of time-dependent \CP asymmetries and the\CP-odd fraction in the decay $B^0 \to D^{*+}D^{*-}$ using $232 \times 10^{6}\BB$ pairs collected by the \babar detector at the PEP-II $B$ factory. Wedetermine the \CP-odd fraction to be $0.125 \pm 0.044\stat \pm 0.007\syst$. Thetime-dependent \CP asymmetry parameters $C_+$ and $S_+$ are determined to be$0.06\pm 0.17\stat \pm 0.03\syst$ and $-0.75 \pm 0.25\stat \pm 0.03\syst$,respectively. The Standard Model predicts these parameters to be 0 and$-\stwob$, respectively, in the absence of penguin amplitude contributions.

physical review letters

Measurement of Time-Dependent<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>Asymmetries and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>-Odd Fraction in the Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>B</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>D</mml:mi><mml:…

Measurement of Time-DependentCPAsymmetries and theCP-Odd Fraction in the DecayB0→D