Ablikim, M.Achasov, Mikhail N.Ambrose, D. J.An, Fenfen F.An, Q.An, Z. H.Bai, J. Z.Ban, Y.Becker, J.Bennett, J. V.Bertani, M.Ji, C. S.Ji, Q.Ji, X. B.Ji, X. L.Jiang, L. L.Qi, M.Jiang, X. S.Jiao, J. B.Jiao, Z.Xiu, Q. L.Zheng, Y. H.Liao, Xiang T.Jin, D. P.Jin, S.Jing, F. F.Kalantar-Nayestanaki, NasserKavatsyuk, MyroslavKuehn, W.Qian, S.Lai, W.Lange, J. S.Zhong, B.Li, S. L.Li, C. H.Li, ChengLiu, B. J.Li, CuiLiu, C. L.Liu, C. X.Liu, C. Y.Liu, F. H.Qiao, C. F.Zhong, J.Liu, FangNikolaev, Ivan B.Liu, FengLiu, HuibiaoLiu, H. B.Bondarenko, OlgaLiu, H. H.Liu, H. M.Liu, H. W.Liu, J. P.Zhou, L.Liu, K. Y.Qin, X. S.Xu, G. F.Liu, KaiLiu, P. L.Liu, Q.Liu, S. B.Liu, X.Boyko, Igor R.Liu, X. H.Zhou, X. K.Liu, Y. B.Liu, Z. A.Liu, ZhiqiangXu, G. M.Qin, Y.Liu, ZhiqingLöhner, HerbertLu, G. R.Lu, H. J.Lu, J. G.Li, X. R.Lu, Q. W.Briere, Roy A.Lu, X. R.Lu, Y. P.Xu, H.Luo, C. L.Qin, Z. H.Luo, M. X.Luo, T.Luo, X. L.Zhou, X. R.Lv, M.Ma, C. L.Ma, F. C.Ma, H. L.Bytev, V.Xu, X. P.Ma, Q. M.Ma, S.Li, F.Ma, T.Zhu, C.Ma, X. Y.Ma, Y.Maas, Frank EwaldMaggiora, MarcoMalik, Q. A.Mao, Y. J.Xu, Z. R.Mao, Z. P.Cai, X.Messchendorp, Johan G.Zhu, K.Cao, G. F.Min, J.Min, T. J.Mitchell, R. E.Mo, X. H.Morales, C. MoralesMotzko, C.Xue, F.Muchnoi, Nickolai YuMuramatsu, HajimePeters, K.Nefedov, Y.Çakır, OrhanQiu, J. F.Nicholson, C.Rashid, K. H.Rong, G.Ruan, X. D.Sarantsev, A.Xue, Z.Schaefer, B. D.Wu, N.Schulze, J.Shao, M.Shen, C. P.Li, G.Shen, X. Y.Çetin, S. A.Sheng, H. Y.Shepherd, M. R.Song, W. M.Chen, M. L.Dai, H. L.Song, X. Y.Spataro, StefanoSpruck, B.Sun, D. H.Sun, G. X.Li, H. B.Sun, J. F.Sun, S. S.Chang, J. F.Sun, Y. J.Zhu, K. J.Yan, L.Sun, Y. Z.Sun, Z. J.Sun, Z. T.Tang, C. J.Tang, X.Thorndike, E. H.Li, J. C.Toth, D.Ullrich, M.Zhu, S. H.Varner, G. S.Yan, W. B.Chelkov, Georgy A.Wang, B.Wang, B. Q.Wang, K.Wang, L. L.Wang, L. S.Wang, MengLi, K.Zhu, X. L.Wang, P.Wang, P. L.Ning, Z.Wang, Q.Wang, Q. J.Chen, G.Wang, S. G.Wang, X. L.Wang, Y. D.Wang, Y. F.Zhu, X. W.Wang, Y. Q.Li, LeiWang, Z.Li, W. D.Wang, Z. G.Wang, Z. Y.Wei, D. H.Weidenkaff, P.Chen, H. S.Wen, Q. G.Zhu, Y. C.Wen, S. P.Werner, M.Wiedner, UlrichLi, Q. J.Yan, Y. H.Wu, L. H.Yang, X.Yang, Y.Yang, Y. X.Ye, H.Zhu, Y. M.Ye, M.Ye, M. H.Yu, B. X.Chen, S. J.Olsen, S. L.Yu, C. X.Bian, J. M.Yu, J. S.Yu, S. P.Yuan, Chang-ZhengLi, Z. B.Yuan, Y.Zafar, Abrar AhmadZallo, A.Zeng, Y.Zhang, B. X.Ouyang, Q.Zhang, B. Y.Chen, Y. B.Li, W. G.Zhang, C. C.Zhu, Y. S.Zhang, D. H.Zhang, Hong-HaoZhang, H. Y.Zhang, J. Q.Zhang, J. W.Zhang, J. Y.Pacetti, SimoneZhang, J. Z.Zhang, S. H.Zhang, X. J.Zhu, Z. A.Li, X. L.Cheng, H. P.Zhang, X. Y.Zhang, Y.Zhang, Y. H.Zhang, Y. S.Zhang, Z. P.Park, J. W.Zhang, Z. Y.Zhao, G.Wu, S. X.Zhao, H. S.Zhao, J. W.Li, X. N.Zhao, K. X.Chu, Y. P.Zhao, LeiZhao, LingZhao, M. G.Pelizaeus, M.Zhao, QiangCalcaterra, AlessandroZhao, Shujun J.Zhao, T. C.Zhao, X. H.Zhao, Y. B.Li, X. Q.Zhao, Z. G.Zhemchugov, AlexeyCronin-Hennessy, D.Zheng, B.Peng, H. P.Zhuang, J.Zheng, J. P.Zou, B. S.Dai, J. P.Zou, J. H.Dedovich, D.Deng, Z. Y.Denig, A.Denysenko, IgorLiang, H.Wu, W.Destefanis, Marco Giovanni MariaLi, D. M.Ding, W. M.Ding, Y.Dong, Liaoyuan Y.Dong, Mingyi Y.Du, S. X.Fang, J.Fang, S. S.Fava, L.Wu, Z.Feldbauer, F.Liang, Y. F.Ping, J. L.Feng, C. Q.Ferroli, R. B.Fu, C. D.Fu, Jinlin L.Gao, Y.Geng, C.Goetzen, K.Xia, L. G.Gong, W. X.Gradl, WolfgangGreco, MichelaPing, R. G.Liang, Y. T.Gu, M. H.Gu, Y. T.Guan, Y. H.Guo, A. Q.Guo, L. B.Chen, J. C.Guo, Y. P.Han, Y. L.Harris, F. A.He, K. L.Poling, RonaldHe, M.Liao, G. R.He, Z. Y.Held, T.Heng, Y. K.Xiao, Z. J.Hou, Z. L.Hu, H. M.Hu, J. F.Hu, T.Huang, G. M.Prencipe, E.Huang, J. S.Huang, X. T.Boger, E.Huang, Y. P.Xie, Y. G.Hussain, Talab2022-10-062022-10-062012-10-01Ablikim, M. vd. (2012). "Observation of e(+)e(-) -> eta J/psi at center-of-mass energy root s=4.009 GeV". Physical Review D, 86(7).1550-79981550-2368https://doi.org/10.1103/PhysRevD.86.071101https://journals.aps.org/prd/abstract/10.1103/PhysRevD.86.071101http://hdl.handle.net/11452/28986Using a 478 pb(-1) data sample collected with the BESIII detector operating at the Beijing Electron Positron Collider storage ring at a center-of-mass energy of root s = 4.009 GeV, the production of e(+)e(-) -> eta J/psi is observed for the first time with a statistical significance of greater than 10 sigma. The Born cross section is measured to be (32.1 +/- 2.8 +/- 1.3) pb, where the first error is statistical and the second systematic. Assuming the eta J/psi signal is from a hadronic transition of the psi(4040), the fractional transition rate is determined to be B(psi(4040) -> eta J/psi) = (5.2 +/- 0.5 +/- 0.2 +/- 0.5) x 10(-3), where the first, second, and third errors are statistical, systematic, and the uncertainty from the psi(4040) resonant parameters, respectively. The production of e(+)e(-) -> pi(0)J/psi is searched for, but no significant signal is observed, and B(psi(4040) -> pi(0)J/psi) < 2.8 x 10(-4) is obtained at the 90% confidence level.eninfo:eu-repo/semantics/openAccessAstronomy & astrophysicsPhysicsArticle0003093468000012-s2.0-84867017898867Astronomy & astrophysicsPhysics, particles & fieldsCharmonium; Deterioration; Mesons