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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. et al. (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). p. 121801. ISSN 0031-9007

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Abstract

We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle γ through a Dalitz plot analysis of neutral D-meson decays to KS0π+π- and KS0K+K- produced in the processes B∓→DK∓, B∓→D*K∓ with D*→Dπ0, Dγ, and B∓→DK*∓ with K*∓→KS0π∓, using 468 million BB̅ 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.

Item Type: Article
Subjects: Q Science > QC Physics
Schools: School of Applied Sciences
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Depositing User: Sharon Beastall
Date Deposited: 07 Jul 2011 13:13
Last Modified: 07 Jul 2011 13:13
URI: http://eprints.hud.ac.uk/id/eprint/10923

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