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Improved measurement of the CKM angle γ in B^{∓}→D^{(*)}K^{(*)∓} decays with a Dalitz plot analysis of D decays to K_{S}^{0}π^{+}π^{-} and K_{S}^{0}K^{+}K^{-}

Aubert, B. et al. (2008) Improved measurement of the CKM angle γ in B^{∓}→D^{(*)}K^{(*)∓} decays with a Dalitz plot analysis of D decays to K_{S}^{0}π^{+}π^{-} and K_{S}^{0}K^{+}K^{-}. Physical Review D, 78 (3). 034023. ISSN 1550-7998

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Abstract

We report on an improved measurement of the Cabibbo-Kobayashi-Maskawa CP-violating phase 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 a sample of 383×106 BB̅ pairs collected by the BABAR detector, we measure γ=(76±22±5±5)° (mod 180°), where the first error is statistical, the second is the experimental systematic uncertainty, and the third reflects the uncertainty on the description of the Dalitz plot distributions. The corresponding 2-standard-deviation region is 29°<γ<122°. This result has a significance of direct CP violation (γ≠0) of 3.0 standard deviations.

Item Type: Article
Subjects: Q Science > QC Physics
Schools: School of Applied Sciences
Depositing User: Sharon Beastall
Date Deposited: 12 May 2011 12:25
Last Modified: 12 May 2011 12:25
URI: http://eprints.hud.ac.uk/id/eprint/10404

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