Journal article

Improved measurement of time-dependent CP violation in B-0 -> J/psi pi(0) decays

SE Lee, K Miyabayashi, H Aihara, T Aushev, T Aziz, AM Bakich, V Balagura, E Barberio, A Bay, K Belous, V Bhardwaj, U Bitenc, S Blyth, A Bondar, A Bozek, M Bracko, TE Browder, P Chang, A Chen, K-F Chen Show all

PHYSICAL REVIEW D | AMER PHYSICAL SOC | Published : 2008

Abstract

We report improved measurements of time-dependent CP violation parameters for B0(B̄0)→J/ψπ0 decay. This analysis is based on 535×106 BB̄ pairs accumulated at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. From the distribution of proper time intervals between the two B decays, we obtain the following CP violation parameters SJ/ψπ0=-0.65±0.21(stat) ±0.05(syst)andAJ/ψπ0=+0.08±0.16(stat)±0.05(syst), which are consistent with standard model expectations. © 2008 The American Physical Society.