We present a measurement of time-dependent CP asymmetries and an updated determination of the CP-odd fraction in the decay B0→D*+D*- using a data sample of 88×106BB̅ pairs collected by the BABAR detector at the PEP-II B Factory at SLAC. We determine the CP-odd fraction to be 0.063±0.055(stat)±0.009(syst). The time-dependent CP asymmetry parameters Im(λ+) and |λ+| are determined to be 0.05±0.29(stat)±0.10(syst) and 0.75±0.19(stat)±0.02(syst), respectively. The standard model predicts these parameters to be -sin2β and 1, respectively, in the absence of penguin diagram contributions.
Measurement of Time-Dependent CP Asymmetries and the CP-Odd Fraction in the Decay B0→D*+D*-
LO VETERE, MAURIZIO;MONGE, MARIA ROBERTA;PATRIGNANI, CLAUDIA;TOSI, SILVANO;
2003-01-01
Abstract
We present a measurement of time-dependent CP asymmetries and an updated determination of the CP-odd fraction in the decay B0→D*+D*- using a data sample of 88×106BB̅ pairs collected by the BABAR detector at the PEP-II B Factory at SLAC. We determine the CP-odd fraction to be 0.063±0.055(stat)±0.009(syst). The time-dependent CP asymmetry parameters Im(λ+) and |λ+| are determined to be 0.05±0.29(stat)±0.10(syst) and 0.75±0.19(stat)±0.02(syst), respectively. The standard model predicts these parameters to be -sin2β and 1, respectively, in the absence of penguin diagram contributions.
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