Measurement of the Time-Dependent CP Asymmetry of Partially Reconstructed B0->D*+D*- Decays

Abstract : We present a new measurement of the time-dependent CP asymmetry of B0->D*+D*- decays using (471+-5) million BBbar pairs collected with the BaBar detector at the PEP-II B Factory at the SLAC National Accelerator Laboratory. Using the technique of partial reconstruction, we measure the time-dependent CP asymmetry parameters S=-0.34+-0.12+-0.05$ and C=+0.15+-0.09+-0.04. Using the value for the CP-odd fraction R_perp=0.158+-0.028+-0.006, previously measured by BaBar with fully reconstructed B0->D*+D*- events, we extract the CP-even components S+=-0.49+-0.18+-0.07+-0.04 and C+=+0.15+-0.09+-0.04. In each case, the first uncertainty is statistical and the second is systematic; the third uncertainty on S+ is the contribution from the uncertainty on R_perp. The measured value of the CP-even component S+ is consistent with the value of sin(2Beta) measured in b->(ccbar)s transitions, and with the Standard Model expectation of small penguin contributions.
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http://hal.in2p3.fr/in2p3-00725319
Contributor : Berger Nicole <>
Submitted on : Friday, August 24, 2012 - 4:00:22 PM
Last modification on : Friday, August 24, 2012 - 4:00:22 PM

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J.P. Lees, V. Poireau, V. Tisserand, D. Bernard, M. Verderi, et al.. Measurement of the Time-Dependent CP Asymmetry of Partially Reconstructed B0->D*+D*- Decays. Physical Review D, American Physical Society, 2012, 86, pp.112006. <10.1103/PhysRevD.86.112006>. <in2p3-00725319>

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