First Observation of CP Violation in B ¯ 0 → DCP (∗) h0 Decays by a Combined Time-Dependent Analysis of BABAR and Belle Data

Abdesselam, A; Adachi, I; Adametz, A; Adye, T; Ahmed, H; Aihara, H; Akar, S; Alam, M; Albert, J; Al Said, S; Andreassen, R; Angelini, C; Anulli, F; Arinstein, K; Arnaud, N; Asner, D; Aston, D; Aulchenko, V; Aushev, T; Ayad, R; Babu, V; Badhrees, I; Bahinipati, S; Bakich, A; Band, H; Banerjee, S; Barberio, E; Bard, D; Barlow, R; Batignani, G; Beaulieu, A; Bellis, M; Ben-Haim, E; Bernard, D; Bernlochner, F; Bettarini, S; Bettoni, D; Bevan, A; Bhardwaj, V; Bhuyan, B; Bianchi, F; Biasini, M; Biswal, J; Blinov, V; Bloom, P; Bobrov, A; Bomben, M; Bondar, A; Bonneaud, G; Bonvicini, G; Bozek, A; Bozzi, C; Bračko, M; Briand, H; Browder, T; Brown, D; Brown, D; Bünger, C; Burchat, P; Buzykaev, A; Calabrese, R; Calcaterra, A; Calderini, G; Carpinelli, M; Cartaro, C; Casarosa, G; Cenci, R; Červenkov, D; Chang, P; Chao, D; Chauveau, J; Cheaib, R; Chekelian, V; Chen, A; Chen, C; Cheng, C; Cheon, B; Chilikin, K; Chistov, R; Cho, K; Chobanova, V; Choi, H; Choi, S; Chrzaszcz, M; Cibinetto, G; Cinabro, D; 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doi:10.1103/PhysRevLett.115.121604

We report a measurement of the time-dependent CP asymmetry of B¯0→DCP(∗)h0 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-, KS0π0, or KS0ω. The measurement is performed combining the final data samples collected at the (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 -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 B¯0→DCP(∗)h0 decays. The hypothesis of no mixing-induced CP violation is excluded in these decays at the level of 5.4 standard deviations.

Abdesselam, A., Adachi, I., Adametz, A., Adye, T., Ahmed, H., Aihara, H., et al. (2015). First Observation of CP Violation in B ¯ 0 → DCP (∗) h0 Decays by a Combined Time-Dependent Analysis of BABAR and Belle Data. PHYSICAL REVIEW LETTERS, 115(12) [10.1103/PhysRevLett.115.121604].