Observation of hc Radiative Decay hc→γ η' and Evidence for hc→γ η
Abstract
A search for radiative decays of the P -wave spin singlet charmonium resonance hc is performed based on 4.48 ×108 ψ' events collected with the BESIII detector operating at the BEPCII storage ring. Events of the reaction channels hc→γ η' and γ η are observed with a statistical significance of 8.4 σ and 4.0 σ , respectively, for the first time. The branching fractions of hc→γ η' and hc→γ η are measured to be B (hc→γ η')=(1.52 ±0.27 ±0.29 )×10-3 and B (hc→γ η )=(4.7 ±1.5 ±1.4 )×10-4, respectively, where the first errors are statistical and the second are systematic uncertainties.
- Publication:
-
Physical Review Letters
- Pub Date:
- June 2016
- DOI:
- 10.1103/PhysRevLett.116.251802
- arXiv:
- arXiv:1603.04936
- Bibcode:
- 2016PhRvL.116y1802A
- Keywords:
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- High Energy Physics - Experiment
- E-Print:
- 7 pages, 2 figures