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Evidence for Direct CP Violation in the Measurement of the Cabbibo-Kobayashi-Maskawa Angle γ with B^∓ → D^(*)K^((*)∓)Decays

del Amo Sanchez, P. and Cheng, C. H. and Doll, D. A. and Echenard, B. and Hitlin, D. G. and Ongmongkolkul, P. and Porter, F. C. and Rakitin, A. Y. (2010) Evidence for Direct CP Violation in the Measurement of the Cabbibo-Kobayashi-Maskawa Angle γ with B^∓ → D^(*)K^((*)∓)Decays. Physical Review Letters, 105 (12). 121801 . ISSN 0031-9007.

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We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle γ through a Dalitz plot analysis of neutral D-meson decays to K_(S)^(0)π^(+)π^- and K_(S)^(0)K^(+)K^- produced in the processes B^∓ → DK^∓, B^∓ → D*K^∓ with D* → Dπ^0, D_γ, and B^∓ → DK^(*∓) with K^(*∓) → K_(S)^(0)π^∓, using 468 million BB[overbar] pairs collected by the BABAR detector at the PEP-II asymmetric-energy e^(+)e^- collider at SLAC. We measure γ = (68±14±4±3)° (modulo 180°), where the first error is statistical, the second is the experimental systematic uncertainty, and the third reflects the uncertainty in the description of the neutral D decay amplitudes. This result is inconsistent with γ = 0 (no direct CP violation) with a significance of 3.5 standard deviations.

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Additional Information:© 2010 American Physical Society. Received 6 May 2010; published 16 September 2010. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MICIIN (Spain), and STFC (United Kingdom). Individuals have received support from the Marie Curie EIF (European Union), the A. P. Sloan Foundation (USA), and the Binational Science Foundation (USA-Israel).
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
NSERC (Natural Sciences and Engineering Research Council of Canada)UNSPECIFIED
CEA (Commissariat à l'Energie Atomique), FranceUNSPECIFIED
CNRS-IN2P3 (Centre National de la Recherche Scientifique), FranceUNSPECIFIED
BMBF (Bundesministerium für Bildung und Forschung), GermanyUNSPECIFIED
DFG (Deutsche Forschungsgemeinschaft), GermanyUNSPECIFIED
INFN (Istituto Nazionale di Fisica Nucleare), ItalyUNSPECIFIED
FOM (Fundamenteel Onderzoek der Materie), The NetherlandsUNSPECIFIED
NFR (Research Council of Norway)UNSPECIFIED
MES (Ministry of Education and Science of the Russian Federation)UNSPECIFIED
MICIIN (Ministerio de Ciencia e Innovación), SpainUNSPECIFIED
STFC (Science and Technology Facilities Council), UKUNSPECIFIED
Marie Curie EIF (European Union)UNSPECIFIED
A. P. Sloan FoundationUNSPECIFIED
Binational Science Foundation (USA-Israel)UNSPECIFIED
Classification Code:PACS: 12.15.Hh, 11.30.Er, 13.25.Ft, 13.25.Hw
Record Number:CaltechAUTHORS:20101029-100150868
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20600
Deposited By: Jason Perez
Deposited On:02 Nov 2010 18:06
Last Modified:26 Dec 2012 12:34

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