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Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle γ with B^± → D^(*)K^((*)±) decays

Lees, J. P. and Chao, D. S. and Cheng, C. H. and Echenard, B. and Flood, K. T. and Hitlin, D. G. and Ongmongkolkul, P. and Porter, F. C. and Rakitin, A. Y. (2013) Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle γ with B^± → D^(*)K^((*)±) decays. Physical Review D, 87 (5). Art. No. 052015. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:20130426-104126854

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Abstract

We report the determination of the Cabibbo-Kobayashi-Maskawa CP-violating angle γ through the combination of various measurements involving B^± → DK^±, B^± → D^*K^±, and B^± → DK^(*±) decays performed by the BABAR experiment at the PEP-II e^+e^- collider at SLAC National Accelerator Laboratory. Using up to 474 million BB pairs, we obtain γ=(69_(-16)^(+17))° modulo 180°. The total uncertainty is dominated by the statistical component, with the experimental and amplitude-model systematic uncertainties amounting to ±4°. The corresponding two-standard-deviation region is 41° < γ < 102°. This result is inconsistent with γ=0 with a significance of 5.9 standard deviations.


Item Type:Article
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http://dx.doi.org/10.1103/PhysRevD.87.052015 DOIUNSPECIFIED
http://link.aps.org/doi/10.1103/PhysRevD.87.052015PublisherUNSPECIFIED
http://prd.aps.org/abstract/PRD/v87/i5/e052015PublisherUNSPECIFIED
Additional Information:© 2013 American Physical Society. Received 7 January 2013; published 22 March 2013. 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 US 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 Economía y Competitividad (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).
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
NSFUNSPECIFIED
Natural Science and Engineering Research Council (Canada)UNSPECIFIED
Commissariat à l’Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France)UNSPECIFIED
Bundesministerium für Bildung und Forschung and Deutsche Forschungs gemeinschaft (Germany)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (Italy)UNSPECIFIED
Foundation for Fundamental Research on Matter (The Netherlands)UNSPECIFIED
Research Council of NorwayUNSPECIFIED
Ministry of Education and Science of the Russian Federation UNSPECIFIED
Ministerio de Economía y Competitividad (Spain)UNSPECIFIED
Science and Technology Facilities Council (United Kingdom)UNSPECIFIED
Marie-Curie IEF program (European Union)UNSPECIFIED
A. P. Sloan FoundationUNSPECIFIED
Classification Code:PACS: 13.25.Hw, 11.30.Er, 12.15.Hh, 14.40.Nd
Record Number:CaltechAUTHORS:20130426-104126854
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130426-104126854
Official Citation:Observation of direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle γ with B±→D(*)K(*)± decays J. P. Lees et al. (BABAR Collaboration) Published 22 March 2013 (12 pages) 052015
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38134
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:26 Apr 2013 18:23
Last Modified:26 Apr 2013 18:23

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