Measurement of the Time-Dependent CP Asymmetry of Partially Reconstructed B0->D*+D*- Decays - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review D Year : 2012

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

N. Arnaud

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.

Dates and versions

in2p3-00725319 , version 1 (24-08-2012)

Identifiers

Cite

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, 2012, 86, pp.112006. ⟨10.1103/PhysRevD.86.112006⟩. ⟨in2p3-00725319⟩
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