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

Author(s)
Dujmic, Denis; Sciolla, Gabriella; Zhao, M.; Fisher, Peter H; Cowan, Ray F
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Alternative title
Evidence for Direct CP Violation in the Measurement of the Cabbibo-Kobayashi-Maskawa Angle γ with B∓→D(*)K(*)∓ Decays
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle gamma through a Dalitz plot analysis of neutral D-meson decays to KS0pi+pi- and KS0K+K- produced in the processes B∓→DK∓, B∓-->D*K∓ with D*-->Dpi0, Dgamma, and B∓→DK*∓ with K*∓-->KS0pi∓, using 468 million BB̅ pairs collected by the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We measure gamma=(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 gamma=0 (no direct CP violation) with a significance of 3.5 standard deviations.
Date issued
2010-09
URI
http://hdl.handle.net/1721.1/60977
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
BABAR Collaboration et al. “Evidence for Direct CP Violation in the Measurement of the Cabbibo-Kobayashi-Maskawa Angle gamma with B^{±}-->D^{(*)}K^{(*)±} Decays.” Physical Review Letters 105.12 (2010): 121801. © 2010 The American Physical Society.
Version: Final published version
ISSN
0031-9007

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