Observation of psi(3770) -> eta J/psi

M. Ablikim,M. N. Achasov,P. Adlarson,S. Ahmed,M. Albrecht,A. Amoroso,Q. An,X. H. Bai,Y. Bai,O. Bakina,R. Baldini Ferroli,I Balossino,Y. Ban,K. Begzsuren,J. Bennett,N. Berger,M. Bertani,D. Bettoni,F. Bianchi,J. Biernat,J. Bloms,A. Bortone,I Boyko,R. A. Briere,H. Cai,X. Cai,A. Calcaterra,G. F. Cao,N. Cao,S. A. Cetin,J. F. Chang,W. L. Chang,G. Chelkov,D. Y. Chen,G. Chen,H. S. Chen,M. L. Chen,S. J. Chen,X. R. Chen,Y. B. Chen,W. Cheng,G. Cibinetto,F. Cossio,X. F. Cui,H. L. Dai,J. P. Dai,X. C. Dai,A. Dbeyssi,R. B. de Boer,D. Dedovich,Z. Y. Deng,A. Denig,I Denysenko,M. Destefanis,F. De Mori,Y. Ding,C. Dong,J. Dong,L. Y. Dong,M. Y. Dong,S. X. Du,J. Fang,S. S. Fang,Y. Fang,R. Farinelli,L. Fava,F. Feldbauer,G. Felici,C. Q. Feng,M. Fritsch,C. D. Fu,Y. Fu,X. L. Gao,Y. Gao,Y. Gao,Y. G. Gao,I Garzia,E. M. Gersabeck,A. Gilman,K. Goetzen,L. Gong,W. X. Gong,W. Gradl,M. Greco,L. M. Gu,M. H. Gu,S. Gu,Y. T. Gu,C. Y. Guan,A. Q. Guo,L. B. Guo,R. P. Guo,Y. P. Guo,A. Guskov,S. Han,T. T. Han,T. Z. Han,X. Q. Hao,F. A. Harris,K. L. He,F. H. Heinsius,T. Held,Y. K. Heng,M. Himmelreich,T. Holtmann,Y. R. Hou,Z. L. Hou,H. M. Hu,J. F. Hu,T. Hu,Y. Hu,G. S. Huang,L. Q. Huang,X. T. Huang,N. Huesken,T. Hussain,W. Ikegami Andersson,W. Imoehl,M. Irshad,S. Jaeger,Q. Ji,Q. P. Ji,X. B. Ji,X. L. Ji,H. B. Jiang,X. S. Jiang,X. Y. Jiang,J. B. Jiao,Z. Jiao,S. Jin,Y. Jin,T. Johansson,N. Kalantar-Nayestanaki,X. S. Kang,R. Kappert,M. Kavatsyuk,B. C. Ke,I. K. Keshk,A. Khoukaz,P. Kiese,R. Kiuchi,R. Kliemt,L. Koch,O. B. Kolcu,B. Kopf,M. Kuemmel,M. Kuessner,A. Kupsc,M. G. Kurth,W. Kuehn,J. J. Lane,J. S. Lange,P. Larin,L. Lavezzi,H. Leithoff,M. Lellmann,T. Lenz,C. Li,C. H. Li,Cheng Li,D. M. Li,F. Li,G. Li,H. B. Li,H. J. Li,J. L. Li,J. Q. Li,Ke Li,L. K. Li,Lei Li,P. L. Li,P. R. Li,W. D. Li,W. G. Li,X. H. Li,X. L. Li,Z. B. Li,Z. Y. Li,H. Liang,H. Liang,Y. F. Liang,Y. T. Liang,L. Z. Liao,J. Libby,C. X. Lin,B. Liu,B. J. Liu,C. X. Liu,D. Liu,D. Y. Liu,F. H. Liu,Fang Liu,Feng Liu,H. B. Liu,H. M. Liu,Huanhuan Liu,Huihui Liu,J. B. Liu,J. Y. Liu,K. Liu,K. Y. Liu,Ke Liu,L. Liu,L. Y. Liu,Q. Liu,S. B. Liu,T. Liu,X. Liu,Y. B. Liu,Z. A. Liu,Zhiqing Liu,Y. F. Long,X. C. Lou,H. J. Lu,J. D. Lu,J. G. Lu,X. L. Lu,Y. Lu,Y. P. Lu,C. L. Luo,M. X. Luo,P. W. Luo,T. Luo,X. L. Luo,S. Lusso,X. R. Lyu,F. C. Ma,H. L. Ma,L. L. Ma,M. M. Ma,Q. M. Ma,R. Q. Ma,R. T. Ma,X. N. Ma,X. X. Ma,X. Y. Ma,Y. M. Ma,F. E. Maas,M. Maggiora,S. Maldaner,S. Malde,Q. A. Malik,A. Mangoni,Y. J. Mao,Z. P. Mao,S. Marcello,Z. X. Meng,J. G. Messchendorp,G. Mezzadri,T. J. Min,R. E. Mitchell,X. H. Mo,Y. J. Mo,N. Yu Muchnoi,H. Muramatsu,S. Nakhoul,Y. Nefedov,F. Nerling,I. B. Nikolaev,Z. Ning,S. Nisar,S. L. Olsen,Q. Ouyang,S. Pacetti,Y. Pan,Y. Pan,M. Papenbrock,A. Pathak,P. Patteri,M. Pelizaeus,H. P. Peng,K. Peters,J. Pettersson,J. L. Ping,R. G. Ping,A. Pitka,R. Poling,V Prasad,H. Qi,M. Qi,T. Y. Qi,S. Qian,C. F. Qiao,L. Q. Qin,X. P. Qin,X. S. Qin,Z. H. Qin,J. F. Qiu,S. Q. Qu,K. H. Rashid,K. Ravindran,C. F. Redmer,A. Rivetti,V Rodin,M. Rolo,G. Rong,Ch Rosner,M. Rump,A. Sarantsev,M. Savrie,Y. Schelhaas,C. Schnier,K. Schoenning,W. Shan,X. Y. Shan,M. Shao,C. P. Shen,P. X. Shen,X. Y. Shen,H. C. Shi,R. S. Shi, X. Shi,X. D. Shi,J. J. Song,Q. Q. Song,Y. X. Song,S. Sosio,S. Spataro,F. F. Sui,G. X. Sun,J. F. Sun,L. Sun,S. S. Sun,T. Sun,W. Y. Sun,Y. J. Sun,Y. K. Sun,Y. Z. Sun,Z. T. Sun,Y. X. Tan,C. J. Tang,G. Y. Tang,V Thoren,B. Tsednee,I Uman,B. Wang,B. L. Wang,C. W. Wang,D. Y. Wang,H. P. Wang,K. Wang,L. L. Wang,M. Wang,M. Z. Wang,Meng Wang,W. P. Wang,X. Wang,X. F. Wang,X. L. Wang,Y. Wang,Y. Wang,Y. D. Wang,Y. F. Wang,Y. Q. Wang,Z. Wang,Z. Y. Wang,Ziyi Wang,Zongyuan Wang,T. Weber,D. H. Wei,P. Weidenkaff,F. Weidner,H. W. Wen,S. P. Wen,D. J. White,U. Wiedner,G. Wilkinson,M. Wolke,L. Wollenberg,J. F. Wu,L. H. Wu,L. J. Wu,Z. Wu,L. Xia,S. Y. Xiao,Y. J. Xiao,Z. J. Xiao,Y. G. Xie,Y. H. Xie,T. Y. Xing,X. A. Xiong,G. F. Xu,J. J. Xu,Q. J. Xu,W. Xu,X. P. Xu,L. Yan,W. B. Yan,W. C. Yan,H. J. Yang,H. X. Yang,L. Yang,R. X. Yang,S. L. Yang,Y. H. Yang,Y. X. Yang,Yifan Yang,Zhi Yang,M. Ye,M. H. Ye,J. H. Yin,Z. Y. You,B. X. Yu,C. X. Yu,G. Yu,J. S. Yu,T. Yu,C. Z. Yuan,W. Yuan,X. Q. Yuan,Y. Yuan,C. X. Yue,A. Yuncu,A. A. Zafar,Y. Zeng,B. X. Zhang,Guangyi Zhang,H. H. Zhang,H. Y. Zhang,J. L. Zhang,J. Q. Zhang,J. W. Zhang,J. Y. Zhang,J. Z. Zhang,Jianyu Zhang,Jiawei Zhang,L. Zhang,Lei Zhang,S. Zhang,S. F. Zhang,T. J. Zhang,X. Y. Zhang,Y. Zhang,Y. H. Zhang,Y. T. Zhang,Yan Zhang,Yao Zhang,Yi Zhang,Z. H. Zhang,Z. Y. Zhang,G. Zhao,J. Zhao,J. Y. Zhao,J. Z. Zhao,Lei Zhao,Ling Zhao,M. G. Zhao,Q. Zhao,S. J. Zhao,Y. B. Zhao,Z. G. Zhao,A. Zhemchugov,B. Zheng,J. P. Zheng,Y. Zheng,Y. H. Zheng,B. Zhong,C. Zhong,L. P. Zhou,Q. Zhou,X. Zhou,X. K. Zhou,X. R. Zhou,A. N. Zhu,J. Zhu,K. Zhu,K. J. Zhu,S. H. Zhu,W. J. Zhu,X. L. Zhu,Y. C. Zhu,Z. A. Zhu,B. S. Zou,J. H. Zou

PHYSICAL REVIEW D（2023）

Cited 0|Views29

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Abstract

Using a data sample collected with the BESIII detector operating at the BEPCII storage ring, the Born cross section of the process e+e- -> eta J=psi at a center-of-mass energy pffisffi = 3.773 GeV is measured to be (8.88 +/- 0.87 +/- 0.42) pb. We fit the cross section line shape before correcting for the initial state radiation ffiffifromps = 3.773 to 4.600 GeV to obtain the branching fraction B(psi(3770) -> eta J=psi). We obtain B(psi(3770) -> eta J=psi) = (11.3 +/- 5.9 +/- 1.1) x 10-4 when the psi(3770) decay amplitude is added coher-ently to the other contributions, and (8.7 +/- 1.0 +/- 0.8) x 10-4 when it is added incoherently. Here the quoted uncertainties are statistical and systematic, respectively. In both cases, the statistical significance of psi(3770) resonance is above 7 sigma. This is the first time the decay psi(3770) -> eta J=psi is observed with a statistical significance greater than 5 sigma.

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