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

  • Author(s): Abdesselam, A
  • Adachi, I
  • Adametz, A
  • Adye, T
  • Ahmed, H
  • Aihara, H
  • Akar, S
  • Alam, MS
  • Albert, J
  • Al Said, S
  • Andreassen, R
  • Angelini, C
  • Anulli, F
  • Arinstein, K
  • Arnaud, N
  • Asner, DM
  • Aston, D
  • Aulchenko, V
  • Aushev, T
  • Ayad, R
  • Babu, V
  • Badhrees, I
  • Bahinipati, S
  • Bakich, AM
  • Band, HR
  • Banerjee, S
  • Barberio, E
  • Bard, DJ
  • Barlow, RJ
  • Batignani, G
  • Beaulieu, A
  • Bellis, M
  • Ben-Haim, E
  • Bernard, D
  • Bernlochner, FU
  • Bettarini, S
  • Bettoni, D
  • Bevan, AJ
  • Bhardwaj, V
  • Bhuyan, B
  • Bianchi, F
  • Biasini, M
  • Biswal, J
  • Blinov, VE
  • Bloom, PC
  • Bobrov, A
  • Bomben, M
  • Bondar, A
  • Bonneaud, GR
  • Bonvicini, G
  • Bozek, A
  • Bozzi, C
  • Bračko, M
  • Briand, H
  • Browder, TE
  • Brown, DN
  • Brown, DN
  • Bünger, C
  • Burchat, PR
  • Buzykaev, AR
  • Calabrese, R
  • Calcaterra, A
  • Calderini, G
  • Carpinelli, M
  • Cartaro, C
  • Casarosa, G
  • Cenci, R
  • Červenkov, D
  • Chang, P
  • Chao, DS
  • Chauveau, J
  • Cheaib, R
  • Chekelian, V
  • Chen, A
  • Chen, C
  • Cheng, CH
  • Cheon, BG
  • Chilikin, K
  • Chistov, R
  • Cho, K
  • et al.

© 2015 American Physical Society. © 2015 American Physical Society. 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.

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