Study of Time-Dependent CP Violation in B0-->J/psipi0 Decays

Study of Time-Dependent CP Violation in B0-->J/psipi0 Decays,10.1103/PhysRevLett.93.261801,Physical Review Letters,S. U. Kataoka,K. Abe,I. Adachi,H. A

Study of Time-Dependent CP Violation in B0-->J/psipi0 Decays  
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S. U. Kataoka, K. Abe, I. Adachi, H. Aihara, M. Akatsu, Y. Asano, T. Aushev, S. Bahinipati, A. M. Bakich, A. Bay, I. Bedny, U. Bitenc
We report a measurement of CP asymmetry parameters in the decay B0(B¯0)-->J/psipi0, which is governed by the b-->cc¯d transition. The analysis is based on a 140 fb-1 data sample accumulated at the Upsilon(4S) resonance by the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson in the J/psipi0 final state is fully reconstructed for events used in this analysis. The accompanying B meson flavor is identified by its decay products. From the distribution of proper-time intervals between the two B decays, we obtain the following CP-violating parameters: SJ/psipi0=-0.72±0.42(stat)±0.09(syst) and AJ/psipi0=-0.01±0.29(stat)±0.03(syst).
Journal: Physical Review Letters - PHYS REV LETT , vol. 93, no. 26, 2004
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