Observation of <i>h<sub>c</sub></i> Radiative Decay <i>h<sub>c</sub></i> → γη′ and Evidence for <i>h<sub>c</sub></i> → γη
PHYSICAL REVIEW LETTERS, vol.116, no.25, 2016 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 116 Issue: 25
- Publication Date: 2016
- Doi Number: 10.1103/physrevlett.116.251802
- Journal Name: PHYSICAL REVIEW LETTERS
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Open Archive Collection: AVESIS Open Access Collection
- Bursa Uludag University Affiliated: No
Abstract
A search for radiative decays of the P-wave spin singlet charmonium resonance h(c) is performed based on 4.48 x 10(8) psi' events collected with the BESIII detector operating at the BEPCII storage ring. Events of the reaction channels h(c) -> gamma eta' and gamma eta are observed with a statistical significance of 8.4 sigma and 4.0 sigma, respectively, for the first time. The branching fractions of h(c) -> gamma eta' and h(c) -> gamma eta' are measured to be B(h(c) -> gamma eta') = (1.52 +/- 0.27 +/- 0.29) x 10(-3) and B(h(c) -> gamma eta) = (4.7 +/- 1.5 +/- 1.4) x 10(-4), respectively, where the first errors are statistical and the second are systematic uncertainties.