We report a measurement of the time-dependent CP asymmetry of B¯0→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)×106BB¯ pairs recorded by the BABAR detector and (772±11)×106BB¯ pairs recorded by the Belle detector. We measure the CP asymmetry parameters −ηf=+0.66±0.10(stat)±0.06(syst) and =−0.02±0.07(stat)±0.03(syst). These results correspond to the first observation of CP violation in B¯0→D(*)CPh0 decays. The hypothesis of no mixing-induced CP violation is excluded in these decays at the level of 5.4 standard deviations.
First Observation of CP Violation in B ¯ 0 → DCP (∗) h0 Decays by a Combined Time-Dependent Analysis of BABAR and Belle Data
LANCERI, LIVIO;VITALE, LORENZO;
2015-01-01
Abstract
We report a measurement of the time-dependent CP asymmetry of B¯0→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)×106BB¯ pairs recorded by the BABAR detector and (772±11)×106BB¯ pairs recorded by the Belle detector. We measure the CP asymmetry parameters −ηf=+0.66±0.10(stat)±0.06(syst) and =−0.02±0.07(stat)±0.03(syst). These results correspond to the first observation of CP violation in B¯0→D(*)CPh0 decays. The hypothesis of no mixing-induced CP violation is excluded in these decays at the level of 5.4 standard deviations.File | Dimensione | Formato | |
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PhysRevLett.115.121604.pdf
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