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(NBs(*)B̄s(*))]×10 -4, and B(Bs0→J/ψη′)=[3.71±0. 61(stat)±0.18(syst)-0.57+0.83(NBs(*)B̄s(*))] ×10-4. The ratio of the two branching fractions is measured to be B(Bs→J/ψη′)B(Bs→J/ ψη)=0.73±0.14(stat)±0.02(syst).
ASJC Scopus subject areas
- Physics and Astronomy(all)