@article{5729e5b4c80a431b8e7936c5e2e7a50b,
title = "Search for the radiative transitions ψ(3770)→ γηc and γηc(2S)",
abstract = "By using a 2.92 fb-1 data sample taken at √s = 3.773 GeV with the BESIII detector operating at the BEPCII collider, we search for the radiative transitions ψ(3770) → γηc and γηc(2S) through the hadronic decays ηc(ηc (2S)) → K0 SK±π+. No significant excess of signal events above background is observed. We set upper limits at a 90\% confidence level for the product branching fractions to be B(ψ(3770) →γηc) ±B(ηc → K0 SK±π+) < 1.6× 10-5 and B(ψ(3770) →γηc(2S)) ×B(ηc(2S) → K0 SK+π+) <5.6× 10-6. Combining our result with world-average values of B(ηc(ηc(2S)) → K0 SK±π+), we find the branching fractions B(ψ(3770) → γηc) > 6.8 × 10-4 and B(ψ(3770) → γηc(2S)) < 2.0 × 10-3 at a 90\% confidence level.",
author = "\{BESIII Collaboration\} and M. Ablikim and Achasov, \{M. N.\} and Ai, \{X. C.\} and O. Albayrak and M. Albrecht and Ambrose, \{D. J.\} and An, \{F. F.\} and Q. An and Bai, \{J. Z.\} and Ferroli, \{R. Baldini\} and Y. Ban and Bennett, \{J. V.\} and M. Bertani and Bian, \{J. M.\} and E. Boger and O. Bondarenko and I. Boyko and S. Braun and Briere, \{R. A.\} and H. Cai and X. Cai and O. Cakir and A. Calcaterra and Cao, \{G. F.\} and Cetin, \{S. A.\} and Chang, \{J. F.\} and G. Chelkov and G. Chen and Chen, \{H. S.\} and Chen, \{J. C.\} and Chen, \{M. L.\} and Chen, \{S. J.\} and X. Chen and Chen, \{X. R.\} and Chen, \{Y. B.\} and Cheng, \{H. P.\} and Chu, \{X. K.\} and Chu, \{Y. P.\} and D. Cronin-Hennessy and Dai, \{H. L.\} and Dai, \{J. P.\} and D. Dedovich and Deng, \{Z. Y.\} and A. Denig and I. Denysenko and M. Destefanis and Ding, \{W. M.\} and Y. Ding and C. Dong and J. Dong",
year = "2014",
month = jun,
day = "18",
doi = "10.1103/PhysRevD.89.112005",
language = "English",
volume = "89",
journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",
issn = "1550-7998",
number = "11",
}