Measurement of branching fractions for ψ (3686 )→γ η' , γ η , and γ π0
Abstract
Using a data sample of 448 ×106 ψ (3686 ) events collected with the BESIII detector operating at the BEPCII storage ring, the decays ψ (3686 )→γ η and ψ (3686 )→γ π0 are observed with a statistical significance of 7.3 σ and 6.7 σ , respectively. The branching fractions are measured to be B (ψ (3686 )→γ η )=(0.85 ±0.18 ±0.05 )×10-6 and B (ψ (3686 )→γ π0)=(0.95 ±0.16 ±0.05 )×10-6. In addition, we measure the branching fraction of ψ (3686 )→γ η' to be B (ψ (3686 )→γ η')=(125.1 ±2.2 ±6.2 )×10-6, which represents an improvement of precision over previous results.
- Publication:
-
Physical Review D
- Pub Date:
- September 2017
- DOI:
- 10.1103/PhysRevD.96.052003
- arXiv:
- arXiv:1708.03103
- Bibcode:
- 2017PhRvD..96e2003A
- Keywords:
-
- High Energy Physics - Experiment
- E-Print:
- Phys. Rev. D 96, 052003 (2017)