Abstract
We present new measurements of time-dependent CP asymmetries for B-0 -> D-(*()+) D-(*()-) decays using (467 +/- 5) X 10(6) B (B) over bar 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 B-0 -> D-(*()+) D-(*()-) decays to be R-perpendicular to = 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-perpendicular to = -1.80 +/- 0.70 +/- 0.16 and C-perpendicular to = +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 B-0 -> D+D-, S = -0.62 +/- 0.21 +/- 0.03 and C = +0.08 +/- 0.17 +/- 0.04 for B-0 -> D*D-+(-), and S = -0.73 +/- 0.23 +/- 0.05 and C = +0.00 +/- 0.17 +/- 0.03 for B-0 -> D+D*(-). For the B-0 -> D*(+/-) D-+/- decays, we also determine the CP-violating asymmetry (A) over bar = +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.
We are grateful for the extraordinary contributions of
our PEP-II colleagues in achieving the excellent luminosity
and machine conditions that have made this work possible.
The success of this project also relies critically on
the expertise and dedication of the computing organizations
that support BABAR. The collaborating institutions
wish to thank SLAC for its support and the kind hospitality
extended to them. This work is supported by the
U.S. Department of Energy and National Science Foundation,
the Natural Sciences and Engineering Research
Council (Canada), the Commissariat à l'Energie Atomique
and Institut National de Physique Nucléaire et de
Physique des Particules (France), the Bundesministerium
für Bildung und Forschung and Deutsche Forschungsgemeinschaft
(Germany), the Istituto Nazionale di Fisica
Nucleare (Italy), the Foundation for Fundamental Research
on Matter (The Netherlands), the Research Council
of Norway, the Ministry of Education and Science of
the Russian Federation, Ministerio de Educación y Ciencia
(Spain), and the Science and Technology Facilities
Council (United Kingdom). Individuals have received
support from the Marie-Curie IEF program (European
Union) and the A. P. Sloan Foundation.
Peer reviewed