@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",
}