Measurements of time-dependent CP asymmetries in B0D(*)+D(*) decays

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 79, 032002 – Published 9 February 2009

Abstract

We present new measurements of time-dependent CP asymmetries for B0D(*)+D(*) decays using (467±5)×106 BB¯ pairs collected with the BABAR detector located at the PEP-II B Factory at the Stanford Linear Accelerator Center. We determine the CP-odd fraction of the B0D*+D* decays to be R=0.158±0.028±0.006 and find CP asymmetry parameters S+=0.76±0.16±0.04 and C+=+0.00±0.12±0.02 for the CP-even component of this decay and S=1.80±0.70±0.16 and C=+0.41±0.49±0.08 for the CP-odd component. We measure S=0.63±0.36±0.05 and C=0.07±0.23±0.03 for B0D+D, S=0.62±0.21±0.03 and C=+0.08±0.17±0.04 for B0D*+D, and S=0.73±0.23±0.05 and C=+0.00±0.17±0.03 for B0D+D*. For the B0D*±D decays, we also determine the CP-violating asymmetry A=+0.008±0.048±0.013. In each case, the first uncertainty is statistical and the second is systematic. The measured values for the asymmetries are all consistent with the standard model.

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  • Received 14 August 2008

DOI:https://doi.org/10.1103/PhysRevD.79.032002

©2009 American Physical Society

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Vol. 79, Iss. 3 — 1 February 2009

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