Ablikim, M.Achasov, M. N.Ai, X. C.Albayrak, O.Albrecht, M.Ambrose, D. J.An, F. F.Lou, Xinchou2014-10-172014-10-172014-06-182014-06-181550-7998http://hdl.handle.net/10735.1/4125By 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) → γη_c and γη_c(2S) through the hadronic decays η_c(η_c(2S)) → K_s^0 K^± 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)→γη_c) × ℬ(η_c→K_s^0 K^± π^∓) < 1.6×10⁻⁵ and ℬ(ψ(3770)→γη_c(2S)) × ℬ(η_c(2S)→K_s^0 K^± π^∓) < 5.6×10⁻⁶. Combining our result with world-average values of ℬ(η_c(η_c(2S))→K_s^0 K^± π^∓), we find the branching fractions ℬ(ψ(3770)→γη_c) < 6.8×10⁻⁴ and ℬ(ψ(3770)→γη_c(2S)) < 2.0×10⁻³ at a 90% confidence level.en©2014 American Physical SocietyBranching fractions (Nuclear physics)Hadrons--DecayPhotonsRadiative transitionsTextAblikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2014. "Search for the radiative transitions ψ(3770)→γη_c and γη_c(2S)." Physical Review D 89(11), doi:10.1103/PhysRevD.89.1120058911112005