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.
Physical Review Letters
Digital Object Identifier (DOI)
Abdesselam et al, A., "First Observation of CP Violation in ¯B0→D(*)CPh0 Decays by a Combined Time-Dependent Analysis of BABAR and Belle Data" (2015). Faculty Publications. 3958.