Published February 1, 2009 | Version Published
Journal Article Open

Measurements of time-dependent CP asymmetries in B^0 → D^((*)+)D^((*)-) decays

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Abstract

We present new measurements of time-dependent CP asymmetries for B^0→D(*)+D(*)- decays using (467±5)×10^6 B[overline B] 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]=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]=-1.80±0.70±0.16 and C[perpendicular]=+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=+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.

Additional Information

© 2009 The American Physical Society. Received 14 August 2008; published 9 February 2009. 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 a` l'Energie Atomique and Institut National de Physique Nucle´aire et de Physique des Particules (France), the Bundesministerium fur 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 Educacio´n 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.

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Additional details

Additional titles

Alternative title
Measurements of time-dependent CP asymmetries in B0→D(∗)+D(∗) - decays

Identifiers

Eprint ID
16229
Resolver ID
CaltechAUTHORS:20091009-084047039

Funding

Stanford Linear Accelerator Center
Department of Energy (DOE)
NSF
Natural Sciences and Engineering Research Council of Canada (NSERC)
Commissariat à l'Energie Atomique (CEA)
Bundesministerium fur Bildung und Forschung (BMBF)
Istituto Nazionale di Fisica Nucleare (INFN)
Stichting voor Fundamenteel Onderzoek der Materie (FOM)
Ministry of Education and Science of the Russian Federation
Ministerio de Educacion y Ciencia (MEC)
Science and Technology Facilities Council (STFC)
Marie Curie Fellowship
Alfred P. Sloan Foundation
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
Norwegian Research Council
Deutsche Forschungsgemeinschaft (DFG)

Dates

Created
2009-10-09
Created from EPrint's datestamp field
Updated
2021-11-08
Created from EPrint's last_modified field