Department

Physics

Document Type

Article

Publication Date

9-18-2015

Abstract

We report a measurement of the time-dependent CP asymmetry of ¯B0→D(*)CPh0 decays, where the light neutral hadron h0 is a π0, η, or ω meson, and the neutral D meson is reconstructed in the CP eigenstates K+K−, K0Sπ0, or K0Sω. The measurement is performed combining the final data samples collected at the Υ(4S) resonance by the BABAR and Belle experiments at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×106B¯B pairs recorded by the BABAR detector and (772±11)×106B¯B pairs recorded by the Belle detector. We measure the CP asymmetry parameters −ηfS=+0.66±0.10(stat)±0.06(syst) and C=−0.02±0.07(stat)±0.03(syst). These results correspond to the first observation of CP violation in ¯B0→D(*)CPh0 decays. The hypothesis of no mixing-induced CP violation is excluded in these decays at the level of 5.4 standard deviations.

Journal

Physical Review Letters

Journal ISSN

1079-7114

Volume

115

Issue

12

Digital Object Identifier (DOI)

10.1103/PhysRevLett.115.121604

Included in

Physics Commons

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