We present a precise measurement of the CP violation parameter sin2?1 and the direct CP violation parameter Af using the final data sample of 772×106 BB¯ pairs collected at the ?(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is reconstructed in a J/?KS0, ?(2S)KS0, ?c1KS0, or J/?KL0 CP eigenstate and its flavor is identified from the decay products of the accompanying B meson. From the distribution of proper-time intervals between the two B decays, we obtain the following CP violation parameters: sin2?1=0.667±0.023(stat)±0.012(syst) and Af=0.006±0.016(stat)±0.012(syst).
Revised: January 4, 2017 |
Published: April 23, 2012
Citation
Adachi I., H. Aihara, D.M. Asner, V. Aulchenko, T. Aushev, T. Aziz, and A.M. Bakich, et al. 2012.Precise Measurement of the CP Violation Parameter sin2?1 in B0?(cc¯ )K0 Decays.Physical Review Letters 108, no. 17:Article No. 171802.PNNL-SA-87999.doi:10.1103/PhysRevLett.108.171802