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Published December 20, 2012 | Published
Journal Article Open

Measurement of the time-dependent CP asymmetry of partially reconstructed B^0 → D^(*+) D^(*-) decays


We present a new measurement of the time-dependent CP asymmetry of B^0→D^(*+)D^(*-) decays using (471±5) million BB 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_⊥ = 0.158 ± 0.028 ± 0.006, previously measured by BABAR with fully reconstructed B^0→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_⊥. The measured value of the CP-even component S_+ is consistent with the value of sin⁡2β measured in b → (cc)s transitions, and with the Standard Model expectation of small penguin contributions.

Additional Information

© 2012 American Physical Society. Received 8 August 2012; published 20 December 2012. 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 (Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Ciencia e Innovaciόn (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 (USA).


Measurement of the time-dependent CP asymmetry of partially reconstructed B0→D*+D*- decays J. P. Lees et al. (BABAR Collaboration) Published 20 December 2012 (15 pages) 112006

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