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Published September 17, 2010 | Supplemental Material + Published
Journal Article Open

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


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.

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).

Attached Files

Published - Sanchez2010p11538Phys_Rev_Lett.pdf

Supplemental Material - README.TXT

Supplemental Material - babar-pub-10-005-epaps.pdf


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