@article{d83f77bb25bc4ef7a7e5429fa0c018f0,
title = "Observation of the electromagnetic Dalitz transition hc →e+e-ηc",
abstract = "Using (27.12±0.14)×108 ψ(3686) decays and data samples of e+e- collisions with s from 4.130 to 4.780 GeV collected with the BESIII detector, we report the first observation of the electromagnetic Dalitz transition hc→e+e-ηc with a statistical significance of 5.4σ. We measure the ratio of the branching fractions B(hc→e+e-ηc)B(hc→γηc) separately for the hc samples produced via ψ(3686)→π0hc and e+e-→π+π-hc. The average ratio is determined to be (0.59±0.10(stat)±0.04(syst))%, where the uncertainty includes both statistical and systematic components.",
author = "{(BESIII Collaboration)} and M. Ablikim and Achasov, {M. N.} and P. Adlarson and S. Ahmed and M. Albrecht and R. Aliberti and A. Amoroso and An, {M. R.} and Q. An and Bai, {X. H.} and Y. Bai and O. Bakina and Ferroli, {R. Baldini} and I. Balossino and Y. Ban and K. Begzsuren and N. Berger and M. Bertani and D. Bettoni and F. Bianchi and J. Bloms and A. Bortone and I. Boyko and Briere, {R. A.} and H. Cai and X. Cai and A. Calcaterra and Cao, {G. F.} and N. Cao and Cetin, {S. A.} and Chang, {J. F.} and Chang, {W. L.} and G. Chelkov and Chen, {D. Y.} and G. Chen and Chen, {H. S.} and Chen, {M. L.} and Chen, {S. J.} and Chen, {X. R.} and Chen, {Y. B.} and Chen, {Z. J.} and Cheng, {W. S.} and G. Cibinetto and F. Cossio and Cui, {X. F.} and Dai, {H. L.} and Dai, {X. C.} and A. Dbeyssi and H. Muramatsu and R. Poling",
note = "Publisher Copyright: {\textcopyright} 2024 authors. Published by the American Physical Society.",
year = "2024",
month = dec,
day = "1",
doi = "10.1103/PhysRevD.110.L111101",
language = "English (US)",
volume = "110",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "11",
}