Observation of J /ψ →γηπ0
Physical Review D, vol.94, no.7, 2016 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 94 Issue: 7
- Publication Date: 2016
- Doi Number: 10.1103/physrevd.94.072005
- Journal Name: Physical Review D
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Open Archive Collection: AVESIS Open Access Collection
- Ankara University Affiliated: Yes
Abstract
We present the first study of the process J/ψ→γηπ0 using (223.7±1.4)×106 J/ψ events accumulated with the BESIII detector at the BEPCII facility. The branching fraction for J/ψ→γηπ0 is measured to be B(J/ψ→γηπ0)=(2.14±0.18(stat)±0.25(syst))×10-5. With a Bayesian approach, the upper limits of the branching fractions B(J/ψ→γa0(980),a0(980)→ηπ0) and B(J/ψ→γa2(1320),a2(1320)→ηπ0) are determined to be 2.5×10-6 and 6.6×10-6 at the 95% confidence level, respectively. All of these measurements are given for the first time.