Letter
Open Access

Observation of $ψ (3770) \to η J / ψ$

M. Ablikim¹, M. N. Achasov^10,b, P. Adlarson⁶⁹, S. Ahmed¹⁵, M. Albrecht⁴, R. Aliberti²⁹, A. Amoroso^68a,68c, M. R. An³³, Q. An^65,51 et al. (BESIII Collaboration)

Q. An^65,51, X. H. Bai⁵⁹, Y. Bai⁵⁰, O. Bakina³⁰, R. Baldini Ferroli^24a, I. Balossino^25a, Y. Ban^40,g, V. Batozskaya^1,38, D. Becker²⁹, K. Begzsuren²⁷, N. Berger²⁹, M. Bertani^24a, D. Bettoni^25a, F. Bianchi^68a,68c, J. Bloms⁶², A. Bortone^68a,68c, I. Boyko³⁰, R. A. Briere⁵, A. Brueggemann⁶², H. Cai⁷⁰, X. Cai^1,51, A. Calcaterra^24a, G. F. Cao^1,56, N. Cao^1,56, S. A. Cetin^55a, J. F. Chang^1,51, W. L. Chang^1,56, G. Chelkov^30,a, C. Chen³⁷, G. Chen¹, H. S. Chen^1,56, M. L. Chen^1,51, S. J. Chen³⁶, T. Chen¹, X. R. Chen^26,56, X. T. Chen¹, Y. B. Chen^1,51, Z. J. Chen^21,h, W. S. Cheng^68c, G. Cibinetto^25a, F. Cossio^68c, J. J. Cui⁴³, H. L. Dai^1,51, J. P. Dai⁷², A. Dbeyssi¹⁵, R. E. de Boer⁴, D. Dedovich³⁰, Z. Y. Deng¹, A. Denig²⁹, I. Denysenko³⁰, M. Destefanis^68a,68c, F. De Mori^68a,68c, Y. Ding³⁴, J. Dong^1,51, L. Y. Dong^1,56, M. Y. Dong^1,51,56, X. Dong⁷⁰, S. X. Du⁷⁴, P. Egorov^30,a, Y. L. Fan⁷⁰, J. Fang^1,51, S. S. Fang^1,56, Y. Fang¹, R. Farinelli^25a, L. Fava^68b,68c, F. Feldbauer⁴, G. Felici^24a, C. Q. Feng^65,51, J. H. Feng⁵², K. Fischer⁶³, M. Fritsch⁴, C. D. Fu¹, H. Gao⁵⁶, Y. N. Gao^40,g, Yang Gao^65,51, I. Garzia^25a,25b, P. T. Ge⁷⁰, Z. W. Ge³⁶, C. Geng⁵², E. M. Gersabeck⁶⁰, A. Gilman⁶³, K. Goetzen¹¹, L. Gong³⁴, W. X. Gong^1,51, W. Gradl²⁹, M. Greco^68a,68c, L. M. Gu³⁶, M. H. Gu^1,51, Y. T. Gu¹³, C. Y. Guan^1,56, A. Q. Guo^26,56, L. B. Guo³⁵, R. P. Guo⁴², Y. P. Guo^9,f, A. Guskov^30,a, T. T. Han⁴³, W. Y. Han³³, X. Q. Hao¹⁶, F. A. Harris⁵⁸, K. K. He⁴⁸, K. L. He^1,56, F. H. Heinsius⁴, C. H. Heinz²⁹, Y. K. Heng^1,51,56, C. Herold⁵³, M. Himmelreich^11,d, T. Holtmann⁴, G. Y. Hou^1,56, Y. R. Hou⁵⁶, Z. L. Hou¹, H. M. Hu^1,56, J. F. Hu^49,i, T. Hu^1,51,56, Y. Hu¹, G. S. Huang^65,51, K. X. Huang⁵², L. Q. Huang^26,56, L. Q. Huang⁶⁶, X. T. Huang⁴³, Y. P. Huang¹, Z. Huang^40,g, T. Hussain⁶⁷, N. Hüsken^23,29, W. Imoehl²³, M. Irshad^65,51, J. Jackson²³, S. Jaeger⁴, S. Janchiv²⁷, Q. Ji¹, Q. P. Ji¹⁶, X. B. Ji^1,56, X. L. Ji^1,51, Y. Y. Ji⁴³, H. B. Jiang⁴³, S. S. Jiang³³, X. S. Jiang^1,51,56, Y. Jiang⁵⁶, J. B. Jiao⁴³, Z. Jiao¹⁹, S. Jin³⁶, Y. Jin⁵⁹, M. Q. Jing^1,56, T. Johansson⁶⁹, N. Kalantar-Nayestanaki⁵⁷, X. S. Kang³⁴, R. Kappert⁵⁷, M. Kavatsyuk⁵⁷, B. C. Ke⁷⁴, I. K. Keshk⁴, A. Khoukaz⁶², P. Kiese²⁹, R. Kiuchi¹, R. Kliemt¹¹, L. Koch³¹, O. B. Kolcu^55a, B. Kopf⁴, M. Kuemmel⁴, M. Kuessner⁴, A. Kupsc^38,69, W. Kühn³¹, J. J. Lane⁶⁰, J. S. Lange³¹, P. Larin¹⁵, A. Lavania²², L. Lavezzi^68a,68c, Z. H. Lei^65,51, H. Leithoff²⁹, M. Lellmann²⁹, T. Lenz²⁹, C. Li³⁷, C. Li⁴¹, C. H. Li³³, Cheng Li^65,51, D. M. Li⁷⁴, F. Li^1,51, G. Li¹, H. Li⁴⁵, H. Li^65,51, H. B. Li^1,56, H. J. Li¹⁶, H. N. Li^49,i, J. Q. Li⁴, J. S. Li⁵², J. W. Li⁴³, Ke Li¹, L. J. Li¹, L. K. Li¹, Lei Li³, M. H. Li³⁷, P. R. Li^32,j,k, S. X. Li⁹, S. Y. Li⁵⁴, T. Li⁴³, W. D. Li^1,56, W. G. Li¹, X. H. Li^65,51, X. L. Li⁴³, Xiaoyu Li^1,56, Z. Y. Li⁵², H. Liang^65,51, H. Liang^1,56, H. Liang²⁸, Y. F. Liang⁴⁷, Y. T. Liang^26,56, G. R. Liao¹², L. Z. Liao⁴³, J. Libby²², A. Limphirat⁵³, C. X. Lin⁵², D. X. Lin^26,56, T. Lin¹, B. J. Liu¹, C. X. Liu¹, D. Liu^15,65, F. H. Liu⁴⁶, Fang Liu¹, Feng Liu⁶, G. M. Liu^49,i, H. B. Liu¹³, H. M. Liu^1,56, Huanhuan Liu¹, Huihui Liu¹⁷, J. B. Liu^65,51, J. L. Liu⁶⁶, J. Y. Liu^1,56, K. Liu¹, K. Y. Liu³⁴, Ke Liu¹⁸, L. Liu^65,51, Lu Liu³⁷, M. H. Liu^9,f, P. L. Liu¹, Q. Liu⁵⁶, S. B. Liu^65,51, T. Liu^9,f, W. K. Liu³⁷, W. M. Liu^65,51, X. Liu^32,j,k, Y. Liu^32,j,k, Y. B. Liu³⁷, Z. A. Liu^1,51,56, Z. Q. Liu⁴³, X. C. Lou^1,51,56, F. X. Lu⁵², H. J. Lu¹⁹, J. G. Lu^1,51, X. L. Lu¹, Y. Lu¹, Y. P. Lu^1,51, Z. H. Lu¹, C. L. Luo³⁵, M. X. Luo⁷³, T. Luo^9,f, X. L. Luo^1,51, X. R. Lyu⁵⁶, Y. F. Lyu³⁷, F. C. Ma³⁴, H. L. Ma¹, L. L. Ma⁴³, M. M. Ma^1,56, Q. M. Ma¹, R. Q. Ma^1,56, R. T. Ma⁵⁶, X. Y. Ma^1,51, Y. Ma^40,g, F. E. Maas¹⁵, M. Maggiora^68a,68c, S. Maldaner⁴, S. Malde⁶³, Q. A. Malik⁶⁷, A. Mangoni^24b, Y. J. Mao^40,g, Z. P. Mao¹, S. Marcello^68a,68c, Z. X. Meng⁵⁹, J. G. Messchendorp^57,11, G. Mezzadri^25a, H. Miao¹, T. J. Min³⁶, R. E. Mitchell²³, X. H. Mo^1,51,56, N. Yu. Muchnoi^10,b, H. Muramatsu⁶¹, S. Nakhoul^11,d, Y. Nefedov³⁰, F. Nerling^11,d, I. B. Nikolaev^10,b, Z. Ning^1,51, S. Nisar^8,l, Y. Niu⁴³, S. L. Olsen⁵⁶, Q. Ouyang^1,51,56, S. Pacetti^24b,24c, X. Pan^9,f, Y. Pan⁶⁰, A. Pathak²⁸, M. Pelizaeus⁴, H. P. Peng^65,51, K. Peters^11,d, J. L. Ping³⁵, R. G. Ping^1,56, S. Plura²⁹, S. Pogodin³⁰, R. Poling⁶¹, V. Prasad^65,51, H. Qi^65,51, H. R. Qi⁵⁴, M. Qi³⁶, T. Y. Qi^9,f, S. Qian^1,51, W. B. Qian⁵⁶, Z. Qian⁵², C. F. Qiao⁵⁶, J. J. Qin⁶⁶, L. Q. Qin¹², X. P. Qin^9,f, X. S. Qin⁴³, Z. H. Qin^1,51, J. F. Qiu¹, S. Q. Qu⁵⁴, K. H. Rashid⁶⁷, K. Ravindran²², C. F. Redmer²⁹, K. J. Ren³³, A. Rivetti^68c, V. Rodin⁵⁷, M. Rolo^68c, G. Rong^1,56, Ch. Rosner¹⁵, A. Sarantsev^30,c, Y. Schelhaas²⁹, C. Schnier⁴, K. Schoenning⁶⁹, M. Scodeggio^25a,25b, K. Y. Shan^9,f, W. Shan²⁰, X. Y. Shan^65,51, J. F. Shangguan⁴⁸, L. G. Shao^1,56, M. Shao^65,51, C. P. Shen^9,f, H. F. Shen^1,56, X. Y. Shen^1,56, B. A. Shi⁵⁶, H. C. Shi^65,51, R. S. Shi^1,56, X. Shi^1,51, X. D. Shi^65,51, J. J. Song¹⁶, W. M. Song^28,1, Y. X. Song^40,g, S. Sosio^68a,68c, S. Spataro^68a,68c, F. Stieler²⁹, K. X. Su⁷⁰, P. P. Su⁴⁸, Y. J. Su⁵⁶, G. X. Sun¹, H. Sun⁵⁶, H. K. Sun¹, J. F. Sun¹⁶, L. Sun⁷⁰, S. S. Sun^1,56, T. Sun^1,56, W. Y. Sun²⁸, X. Sun^21,h, Y. J. Sun^65,51, Y. Z. Sun¹, Z. T. Sun⁴³, Y. H. Tan⁷⁰, Y. X. Tan^65,51, C. J. Tang⁴⁷, G. Y. Tang¹, J. Tang⁵², L. Y. Tao⁶⁶, Q. T. Tao^21,h, J. X. Teng^65,51, V. Thoren⁶⁹, W. H. Tian⁴⁵, Y. Tian^26,56, I. Uman^55b, B. Wang¹, B. L. Wang⁵⁶, C. W. Wang³⁶, D. Y. Wang^40,g, F. Wang⁶⁶, H. J. Wang^32,j,k, H. P. Wang^1,56, K. Wang^1,51, L. L. Wang¹, M. Wang⁴³, M. Z. Wang^40,g, Meng Wang^1,56, S. Wang¹², S. Wang^9,f, T. Wang^9,f, T. J. Wang³⁷, W. Wang⁵², W. H. Wang⁷⁰, W. P. Wang^65,51, X. Wang^40,g, X. F. Wang^32,j,k, X. L. Wang^9,f, Y. D. Wang³⁹, Y. F. Wang^1,51,56, Y. H. Wang⁴¹, Y. Q. Wang¹, Z. Wang^1,51, Z. Y. Wang^1,56, Ziyi Wang⁵⁶, D. H. Wei¹², F. Weidner⁶², S. P. Wen¹, D. J. White⁶⁰, U. Wiedner⁴, G. Wilkinson⁶³, M. Wolke⁶⁹, L. Wollenberg⁴, J. F. Wu^1,56, L. H. Wu¹, L. J. Wu^1,56, X. Wu^9,f, X. H. Wu²⁸, Y. Wu⁶⁵, Y. J. Wu²⁶, Z. Wu^1,51, L. Xia^65,51, T. Xiang^40,g, G. Y. Xiao³⁶, H. Xiao^9,f, S. Y. Xiao¹, Y. L. Xiao^9,f, Z. J. Xiao³⁵, C. Xie³⁶, X. H. Xie^40,g, Y. Xie⁴³, Y. G. Xie^1,51, Y. H. Xie⁶, Z. P. Xie^65,51, T. Y. Xing^1,56, C. F. Xu¹, C. J. Xu⁵², G. F. Xu¹, H. Y. Xu⁵⁹, Q. J. Xu¹⁴, X. P. Xu⁴⁸, Y. C. Xu⁵⁶, Z. P. Xu³⁶, F. Yan^9,f, L. Yan^9,f, W. B. Yan^65,51, W. C. Yan⁷⁴, H. J. Yang^44,e, H. X. Yang¹, L. Yang⁴⁵, S. L. Yang⁵⁶, Y. X. Yang^1,56, Yifan Yang^1,56, Zhi Yang²⁶, M. Ye^1,51, M. H. Ye⁷, J. H. Yin¹, Z. Y. You⁵², B. X. Yu^1,51,56, C. X. Yu³⁷, G. Yu^1,56, J. S. Yu^21,h, T. Yu⁶⁶, C. Z. Yuan^1,56, L. Yuan², S. C. Yuan¹, X. Q. Yuan¹, Y. Yuan^1,56, Z. Y. Yuan⁵², C. X. Yue³³, A. A. Zafar⁶⁷, F. R. Zeng⁴³, X. Zeng⁶, Y. Zeng^21,h, Y. H. Zhan⁵², A. Q. Zhang¹, B. L. Zhang¹, B. X. Zhang¹, G. Y. Zhang¹⁶, H. Zhang⁶⁵, H. H. Zhang⁵², H. H. Zhang²⁸, H. Y. Zhang^1,51, J. L. Zhang⁷¹, J. Q. Zhang³⁵, J. W. Zhang^1,51,56, J. Y. Zhang¹, J. Z. Zhang^1,56, Jianyu Zhang^1,56, Jiawei Zhang^1,56, L. M. Zhang⁵⁴, L. Q. Zhang⁵², Lei Zhang³⁶, P. Zhang¹, Q. Y. Zhang^33,74, Shuihan Zhang^1,56, Shulei Zhang^21,h, X. D. Zhang³⁹, X. M. Zhang¹, X. Y. Zhang⁴³, X. Y. Zhang⁴⁸, Y. Zhang⁶³, Y. T. Zhang⁷⁴, Y. H. Zhang^1,51, Yan Zhang^65,51, Yao Zhang¹, Z. H. Zhang¹, Z. Y. Zhang³⁷, Z. Y. Zhang⁷⁰, G. Zhao¹, J. Zhao³³, J. Y. Zhao^1,56, J. Z. Zhao^1,51, Lei Zhao^65,51, Ling Zhao¹, M. G. Zhao³⁷, Q. Zhao¹, S. J. Zhao⁷⁴, Y. B. Zhao^1,51, Y. X. Zhao^26,56, Z. G. Zhao^65,51, A. Zhemchugov^30,a, B. Zheng⁶⁶, J. P. Zheng^1,51, Y. H. Zheng⁵⁶, B. Zhong³⁵, C. Zhong⁶⁶, X. Zhong⁵², H. Zhou⁴³, L. P. Zhou^1,56, X. Zhou⁷⁰, X. K. Zhou⁵⁶, X. R. Zhou^65,51, X. Y. Zhou³³, Y. Z. Zhou ^9,f, J. Zhu³⁷, K. Zhu¹, K. J. Zhu^1,51,56, L. X. Zhu⁵⁶, S. H. Zhu⁶⁴, S. Q. Zhu³⁶, T. J. Zhu⁷¹, W. J. Zhu^9,f, Y. C. Zhu^65,51, Z. A. Zhu^1,56, B. S. Zou¹, and J. H. Zou¹ (BESIII Collaboration)

¹Institute of High Energy Physics, Beijing 100049, People’s Republic of China
²Beihang University, Beijing 100191, People’s Republic of China
³Beijing Institute of Petrochemical Technology, Beijing 102617, People’s Republic of China
⁴Bochum Ruhr-University, D-44780 Bochum, Germany
⁵Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
⁶Central China Normal University, Wuhan 430079, People’s Republic of China
⁷China Center of Advanced Science and Technology, Beijing 100190, People’s Republic of China
⁸COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan
⁹Fudan University, Shanghai 200433, People’s Republic of China
¹⁰G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia
¹¹GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany
¹²Guangxi Normal University, Guilin 541004, People’s Republic of China
¹³Guangxi University, Nanning 530004, People’s Republic of China
¹⁴Hangzhou Normal University, Hangzhou 310036, People’s Republic of China
¹⁵Helmholtz Institute Mainz, Staudinger Weg 18, D-55099 Mainz, Germany
¹⁶Henan Normal University, Xinxiang 453007, People’s Republic of China
¹⁷Henan University of Science and Technology, Luoyang 471003, People’s Republic of China
¹⁸Henan University of Technology, Zhengzhou 450001, People’s Republic of China
¹⁹Huangshan College, Huangshan 245000, People’s Republic of China
²⁰Hunan Normal University, Changsha 410081, People’s Republic of China
²¹Hunan University, Changsha 410082, People’s Republic of China
²²Indian Institute of Technology Madras, Chennai 600036, India
²³Indiana University, Bloomington, Indiana 47405, USA
^24aINFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy
^24bINFN Sezione di Perugia, I-06100, Perugia, Italy
^24cUniversity of Perugia, I-06100, Perugia, Italy
^25aINFN Sezione di Ferrara, I-44122, Ferrara, Italy
^25bUniversity of Ferrara, I-44122, Ferrara, Italy
²⁶Institute of Modern Physics, Lanzhou 730000, People’s Republic of China
²⁷Institute of Physics and Technology, Peace Avenue 54B, Ulaanbaatar 13330, Mongolia
²⁸Jilin University, Changchun 130012, People’s Republic of China
²⁹Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
³⁰Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia
³¹Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
³²Lanzhou University, Lanzhou 730000, People’s Republic of China
³³Liaoning Normal University, Dalian 116029, People’s Republic of China
³⁴Liaoning University, Shenyang 110036, People’s Republic of China
³⁵Nanjing Normal University, Nanjing 210023, People’s Republic of China
³⁶Nanjing University, Nanjing 210093, People’s Republic of China
³⁷Nankai University, Tianjin 300071, People’s Republic of China
³⁸National Centre for Nuclear Research, Warsaw 02-093, Poland
³⁹North China Electric Power University, Beijing 102206, People’s Republic of China
⁴⁰Peking University, Beijing 100871, People’s Republic of China
⁴¹Qufu Normal University, Qufu 273165, People’s Republic of China
⁴²Shandong Normal University, Jinan 250014, People’s Republic of China
⁴³Shandong University, Jinan 250100, People’s Republic of China
⁴⁴Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
⁴⁵Shanxi Normal University, Linfen 041004, People’s Republic of China
⁴⁶Shanxi University, Taiyuan 030006, People’s Republic of China
⁴⁷Sichuan University, Chengdu 610064, People’s Republic of China
⁴⁸Soochow University, Suzhou 215006, People’s Republic of China
⁴⁹South China Normal University, Guangzhou 510006, People’s Republic of China
⁵⁰Southeast University, Nanjing 211100, People’s Republic of China
⁵¹State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China
⁵²Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
⁵³Suranaree University of Technology, University Avenue 111, Nakhon Ratchasima 30000, Thailand
⁵⁴Tsinghua University, Beijing 100084, People’s Republic of China
^55aTurkish Accelerator Center Particle Factory Group, Istinye University, 34010, Istanbul, Turkey
^55bNear East University, Nicosia, North Cyprus, Mersin 10, Turkey
⁵⁶University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
⁵⁷University of Groningen, NL-9747 AA Groningen, Netherlands
⁵⁸University of Hawaii, Honolulu, Hawaii 96822, USA
⁵⁹University of Jinan, Jinan 250022, People’s Republic of China
⁶⁰University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
⁶¹University of Minnesota, Minneapolis, Minnesota 55455, USA
⁶²University of Muenster, Wilhelm-Klemm-Strasse 9, 48149 Muenster, Germany
⁶³University of Oxford, Keble Road, Oxford OX13RH, United Kingdom
⁶⁴University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China
⁶⁵University of Science and Technology of China, Hefei 230026, People’s Republic of China
⁶⁶University of South China, Hengyang 421001, People’s Republic of China
⁶⁷University of the Punjab, Lahore-54590, Pakistan
^68aUniversity of Turin and INFN, University of Turin, I-10125, Turin, Italy
^68bUniversity of Eastern Piedmont, I-15121, Alessandria, Italy
^68cINFN, I-10125, Turin, Italy
⁶⁹Uppsala University, Box 516, SE-75120 Uppsala, Sweden
⁷⁰Wuhan University, Wuhan 430072, People’s Republic of China
⁷¹Xinyang Normal University, Xinyang 464000, People’s Republic of China
⁷²Yunnan University, Kunming 650500, People’s Republic of China
⁷³Zhejiang University, Hangzhou 310027, People’s Republic of China
⁷⁴Zhengzhou University, Zhengzhou 450001, People’s Republic of China

^aAlso at the Moscow Institute of Physics and Technology, Moscow 141700, Russia.
^bAlso at the Novosibirsk State University, Novosibirsk, 630090, Russia.
^cAlso at the NRC “Kurchatov Institute,” PNPI, 188300, Gatchina, Russia.
^dAlso at Goethe University Frankfurt, 60323 Frankfurt am Main, Germany.
^eAlso at Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education; Shanghai Key Laboratory for Particle Physics and Cosmology; and Institute of Nuclear and Particle Physics, Shanghai 200240, People’s Republic of China.
^fAlso at Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443, People’s Republic of China.
^gAlso at State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People’s Republic of China.
^hAlso at School of Physics and Electronics, Hunan University, Changsha 410082, China.
ⁱAlso at Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China.
^jAlso at Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, People’s Republic of China.
^kAlso at Lanzhou Center for Theoretical Physics, Lanzhou University, Lanzhou 730000, People’s Republic of China.
^lAlso at the Department of Mathematical Sciences, IBA, Karachi, Pakistan.

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Phys. Rev. D 107, L091101 – Published 15 May, 2023

DOI: https://doi.org/10.1103/PhysRevD.107.L091101

Abstract

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

Physics Subject Headings (PhySH)

Article Text

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Phys. Rev. D 107, L091101– Published 15 May, 2023

Vol. 107, Iss. 9 — 1 May 2023

Received 23 December 2022
Accepted 18 April 2023

DOI: https://doi.org/10.1103/PhysRevD.107.L091101

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Observation of $ψ (3770) \to η J / ψ$

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Observation of ψ(3770)→ηJ/ψ

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Observation of $ψ (3770) \to η J / ψ$