We report first observations of Bs0→J/ψη and Bs0→J/ψη ′. The results are obtained from 121.4fb -1 of data collected at the Υ(5S) resonance with the Belle detector at the KEKB e +e - collider. We obtain the branching fractions B(Bs0→J/ψη)=[5.10±0.50(stat)±0. 25(syst)-0.79+1.14(N Bs(*)B̄s(*))]×10 -4, and B(Bs0→J/ψη ′)=[3.71±0. 61(stat)±0.18(syst)-0.57+0.83(N Bs(*)B̄s(*))] ×10 -4. The ratio of the two branching fractions is measured to be B(B s→J/ψη ′)B(B s→J/ ψη)=0.73±0.14(stat)±0.02(syst).
ASJC Scopus subject areas
- Physics and Astronomy(all)