Measurement Of Higher-Order Multipole Amplitudes In Psi(3686) -> Gamma Chi(C1,2) With Chi(C1,2) -> Gamma J/Psi And Search For The Transition Eta(C)(2s) -> Gamma J/Psi

M. Ablikim,S. L. Olsen,F. H. Liu,W. P. Wang,X. C. Ai,T. Hussain,W. C. Yan,T. Held,X. N. Ma,H. M. Hu,L. G. Xia,W. X. Gong,T. Li,X. Tang,W. Shan,X. L. Kang,G. F. Xu,Y. Hu,Q. J. Xu,G. R. Liao,X. S. Qin,Ling Zhao,Y. Zhang,H. J. Lu,J. L. Zhang,G. Mezzadri,H. X. Yang,X. Y. Zhou,C. Q. Feng,S. Zhu,H. P. Cheng,W. L. Yuan,X. Z. Huang,L. H. Wu,A. Zhemchugov,K. Goetzen,D. Wang,Y. F. Liang,X. K. Zhou,K. Peters,I. Tapan,Z. H. Qin,L. L. Wang,D. J. Ambrose,J. H. Yin,M. Kornicer,J. J. Zhang,X. Chen,M. Wang,A. Q. Guo,H. H. Zhang,J. Y. Zhang,Z. T. Sun,S. Pacetti,B. Zheng,I. Boyko,C. F. Redmer,Z. L. Huang,M. Destefanis,G. S. Huang,L. G. Xia,Y. P. Guo,T. Luo,M. Albrecht,J. S. Huang,Q. W. Zhao,Y. T. Liang,O. Albayrak,Cheng Li,T. Ma,A. Kupsc,Q. Gao,B. J. Liu,X. R. Zhou,M. Shi,Y. Ban,L. B. Guo,H. L. Ma,Y. Huang,J. C. Chen,T. Weber,Y. Zheng,C. L. Luo,K. Y. Liu,U. Wiedner,F. Y. Li,W. J. Zheng,S. Q. Zhang,Jin Li,T. Hu,N. Yu. Muchnoi,I. B. Nikolaev,L. W. Jiang,X. F. Wang,C. Dong,Z. Jiao,L. Zotti,E. Fioravanti,X. H. Sun,X. D. Ruan,J. S. Lange,G. Rong,D. Bettoni,J. B. Liu,C. X. Liu,S. Marcello,X. Y. Gao,J. F. Qiu,C. X. Yu,Z. Ning,Lei Zhao,H. B. Li,J. Pettersson,Z. Haddadi,X. Y. Jiang,S. Chen,Feng Liu,X. L. Zhu,H. R. Qi,Y. Lu,E. H. Thorndike,Z. Zhao,L. Zhou,Y. D. Wang,I. Uman,S. Sosio,R. P. Guo,A. A. Zafar,I. Garzia,S. A. Cetin,Y. J. Sun,D. X. Lin,W. Li,Q. An,X. Q. Li,A. Denig,J. Zhang,J. Y. Liu,Z. A. Zhu,Y. Guo,D. V. Dedovich,H. Y. Chen,X. H. Mo,C. D. Fu,J. C. Li,S. Han,X. Lyu,A. Zallo,A. Hafner,Y. S. Zhu,O. Cakir,M. N. Achasov,M. Tiemens,M. Shao,S. H. Zhu,Y. M. Ma,M. Qi,B. S. Zou,J. P. Liu,K. Schoenning,S. X. Du,X. S. Kang,P. X. Shen,Z. P. Mao,P. L. Liu,Lei Li,Y. B. Chen,V. Prasad,J. F. Sun,X. B. Ji,X. T. Huang,Y. Nefedov,L. L. Ma,J. W. Zhang,G. Zhao,Y. H. Zhang,A. Amoroso,S. G. Wang,M. Ye,A. Calcaterra,Y. B. Liu,J. B. Wei,S. S. Fang,X. L. Li,L. Fava,X. Y. Niu,W. G. Li,Ch. Rosner,G. Cibinetto,X. P. Xu,M. G. Zhao,C. F. Qiao,B. Zhong,H. Liang,B. C. Ke,D. M. Li,L. S. Wang,F. Nerling,G. F. Cao,G. X. Sun,J. P. Dai,J. F. Hu,K. H. Rashid,Z. B. Li,Y. Ding,Z. Wang,C. J. Tang,X. Cai,A. Dbeyssi,M. Savrié,K. Zhang,J. S. Yu,R. Baldini Ferroli,Q. Ouyang,L. J. Wu,H. Xiao,L. Yan,Q. Ji,K. Liu,R. Kliemt,C. H. Li,Zhiqing Liu,Q. Liu,M. Pelizaeus,Y. F. Wang,Z. Y. Deng,Q. P. Ji,O. Fedorov,Z. A. Liu,Yu Zhang,J. Fang,S. P. Wen,N. Qin,Z. Y. Wang,S. J. Zhao,B. Y. Zhang,M. L. Chen,H. Leithoff,X. Zhou,Y. T. Gu,L. D. Liu,R. Poling,X. L. Gao,J. G. Lu,J. Min,S. B. Liu,W. Gradl,Y. K. Heng,X. C. Lou,A. Sarantsev,X. Fang,F. E. Maas,Q. Zhao,Y. Q. Wang,X. Y. Shen,L. Gong,H. Loehner,J. Z. Zhao,J. B. Jiao,Q. N. Xu,L. Y. Dong,Y. Xia,H. Muramatsu,G. Li,T. C. Zhao,O. B. Kolcu,Q. M. Ma,L. Xu,E. Boger,M. Maggiora,J. Dong,H. Peng,A. Yuncu,M. X. Luo,Y. B. Li,D. Xiao,F. C. Ma,M. Kavatsyuk,M. M. Ma,S. Qian,K. Zhu,M. Ripka,C. Hu,B. Wang,F. A. Harris,S. S. Sun,P. Wang,Y. Pan,D. H. Wei,Z. Gao,X. M. Li,S. L. Niu,K. Wang,D. P. Jin,G. Felici,L. Yang,L. Q. Qin,J. H. Zou,S. Nisar,C. Morales Morales,Y. Z. Sun,Z. H. Wang,M. Bertani,C. Zhang,Z. L. Dou,S. J. Chen,H. J. Yang,W. B. Yan,Q. Y. Li,P. F. Duan,J. F. Chang,Y. B. Zhao,Y. J. Mo,N. Kalantar-Nayestanaki,Z. L. Hou,A. Julin,Z. J. Sun,C. P. Shen,X. R. Chen,B. X. Yu,Y. T. Zhang,K. J. Zhu,Y. Wang,D. W. Bennett,M. H. Gu,H. Y. Sheng,K. Li,Y. Zeng,J. V. Bennett,Z. Zhang,H. M. Liu,Fang Liu,P. R. Li,F. F. An,X. Y. Song,Y. C. Zhu,D. Wang,Y. P. Lu,H. B. Liu,X. Y. Ma,J. Z. Bai,D. H. Zhang,R. Farinelli,M. Greco,D. Liu,Y. H. Guan,P. L. Wang,P. Weidenkaff,H. S. Chen,X. N. Li,Z. Wu,J. Z. Zhang,Z. Y. Zhang,J. L. Ping,F. Bianchi,X. L. Luo,W. Wang,P. Patteri,B. X. Zhang,T. Johansson,Y. Gao,J. Q. Zhang,W. Kühn,C. Leng,P. Kiese,G. Chen,J. J. Xu,R. A. Briere,P. Larin,H. L. Dai,S. Schumann,J. J. Liang,Y. N. Zhang,Y. H. Yan,R. G. Ping,L. Zhang,X. Zhang,Y. G. Xie,Z. P. Zhang,R. E. Mitchell,B. Kloss,J. M. Bian,C. Z. Yuan,B. L. Wang,J. Liu,Y. X. Yang,C. C. Zhang,S. Spataro,Y. Fang,M. Ullrich,H. Y. Zhang,J. P. Zheng,J. Y. Zhao,M. Wolke,F. Li,Z. J. Xiao,Z. Zeng,X. K. Chu,M. H. Ye,X. S. Jiang,M. Y. Dong,H. H. Liu,B. J. Liu,X. L. Ji,X. Liu,Y. Mao,B. Kopf,J. G. Messchendorp,K. L. He,J. Zhuang,Q. L. Xiu,W. M. Song,S. Jin,M. Lara,H. J. Li,Y. Yuan,I. Denysenko,G. A. Chelkov,H. Cai,F. Feldbauer,J. W. Zhao,M. Fritsch,X. Q. Hao,Z. G. Wang,G. Varner,F. De Mori

PHYSICAL REVIEW D（2017）

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Abstract

Using 106 x 10(6) psi(3686) events collected with the BESIII detector, we measure multipole amplitudes for the decay psi(3686) ->; gamma chi(c1,2) -> gamma gamma J/psi beyond the dominant electric-dipole amplitudes. The normalized magnetic-quadrupole (M2) amplitude for psi(3686) -> gamma chi(c1,2) -> gamma gamma J/psi and the normalized electric-dipole amplitudes for psi(3686) -> gamma chi(c2) -> gamma J/psi and determined. The M2 amplitudes for psi(3686) -> gamma chi(c1) and ; chi(c1,2) -> gamma J/psi are found to differ significantly from zero and are consistent with theoretical predictions. We also obtain the ratios of M2 contributions of psi(3686) and J/psi decays to;2,chi(c1,2,) b(2)(1/)b(2)(2) = 1.35 +/- 0.72 and a(2)(1/)a(2)(2) = 0.617 +/- 0.083,,which agree well with theoretical expectations. By considering the multipole contributions of chi(c1,2), we measure the product branching fractions for the cascade decays psi(3686) -> gamma chi(c 0,1,2) -> gamma gamma J/psi and search for the process eta(c)(2s) -> gamma J/psi through psi(3686) -> gamma eta(c)(2s).The product branching fraction for psi(3686) -> gamma chi(c0) -> gamma gamma J/psi is 3 sigma larger than published measurements, while those of psi(3686) -> gamma chi(c1,2) -> gamma gamma J/psi are consistent. No significant signal for the decay psi(3686) -> gamma eta(c) (2s) -> gamma gamma J/psi is observed, and the upper limit of the product branching fraction at the 90% confidence level is determined.

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Key words

higher-order

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