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Observation of $e^{+} e^{-} \to η h_{c}$ at center-of-mass energies from 4.085 to 4.600 GeV

M. Ablikim¹, M. N. Achasov^9,d, S. Ahmed¹⁴, X. C. Ai¹, O. Albayrak⁵, M. Albrecht⁴, D. J. Ambrose⁴⁵, A. Amoroso^50a,50c, F. F. An¹ et al. (BESIII Collaboration)

F. F. An¹, Q. An^47,38, J. Z. Bai¹, O. Bakina²³, R. Baldini Ferroli^20a, Y. Ban³¹, D. W. Bennett¹⁹, J. V. Bennett⁵, N. Berger²², M. Bertani^20a, D. Bettoni^21a, J. M. Bian⁴⁴, F. Bianchi^50a,50c, E. Boger^23,b, I. Boyko²³, R. A. Briere⁵, H. Cai⁵², X. Cai^1,38, O. Cakir^41a, A. Calcaterra^20a, G. F. Cao^1,42, S. A. Cetin^41b, J. Chai^50c, J. F. Chang^1,38, G. Chelkov^23,b,c, G. Chen¹, H. S. Chen^1,42, J. C. Chen¹, M. L. Chen^1,38, S. Chen⁴², S. J. Chen²⁹, X. Chen^1,38, X. R. Chen²⁶, Y. B. Chen^1,38, X. K. Chu³¹, G. Cibinetto^21a, H. L. Dai^1,38, J. P. Dai^34,h, A. Dbeyssi¹⁴, D. Dedovich²³, Z. Y. Deng¹, A. Denig²², I. Denysenko²³, M. Destefanis^50a,50c, F. De Mori^50a,50c, Y. Ding²⁷, C. Dong³⁰, J. Dong^1,38, L. Y. Dong^1,42, M. Y. Dong^1,38,42, Z. L. Dou²⁹, S. X. Du⁵⁴, P. F. Duan¹, J. Z. Fan⁴⁰, J. Fang^1,38, S. S. Fang^1,42, X. Fang^47,38, Y. Fang¹, R. Farinelli^21a,21b, L. Fava^50b,50c, F. Feldbauer²², G. Felici^20a, C. Q. Feng^47,38, E. Fioravanti^21a, M. Fritsch^22,14, C. D. Fu¹, Q. Gao¹, X. L. Gao^47,38, Y. Gao⁴⁰, Z. Gao^47,38, I. Garzia^21a, K. Goetzen¹⁰, L. Gong³⁰, W. X. Gong^1,38, W. Gradl²², M. Greco^50a,50c, M. H. Gu^1,38, Y. T. Gu¹², Y. H. Guan¹, A. Q. Guo¹, L. B. Guo²⁸, R. P. Guo¹, Y. Guo¹, Y. P. Guo²², Z. Haddadi²⁵, A. Hafner²², S. Han⁵², X. Q. Hao¹⁵, F. A. Harris⁴³, K. L. He^1,42, F. H. Heinsius⁴, T. Held⁴, Y. K. Heng^1,38,42, T. Holtmann⁴, Z. L. Hou¹, C. Hu²⁸, H. M. Hu^1,42, T. Hu^1,38,42, Y. Hu¹, G. S. Huang^47,38, J. S. Huang¹⁵, X. T. Huang³³, X. Z. Huang²⁹, Z. L. Huang²⁷, T. Hussain⁴⁹, W. Ikegami Andersson⁵¹, Q. Ji¹, Q. P. Ji¹⁵, X. B. Ji^1,42, X. L. Ji^1,38, L. W. Jiang⁵², X. S. Jiang^1,38,42, X. Y. Jiang³⁰, J. B. Jiao³³, Z. Jiao¹⁷, D. P. Jin^1,38,42, S. Jin^1,42, T. Johansson⁵¹, A. Julin⁴⁴, N. Kalantar-Nayestanaki²⁵, X. L. Kang¹, X. S. Kang³⁰, M. Kavatsyuk²⁵, B. C. Ke⁵, P. Kiese²², R. Kliemt¹⁰, B. Kloss²², O. B. Kolcu^41b,f, B. Kopf⁴, M. Kornicer⁴³, A. Kupsc⁵¹, W. Kühn²⁴, J. S. Lange²⁴, M. Lara¹⁹, P. Larin¹⁴, H. Leithoff²², C. Leng^50c, C. Li⁵¹, Cheng Li^47,38, D. M. Li⁵⁴, F. Li^1,38, F. Y. Li³¹, G. Li¹, H. B. Li^1,42, H. J. Li¹, J. C. Li¹, Jin Li³², K. Li³³, K. Li¹³, Lei Li³, P. R. Li^42,7, Q. Y. Li³³, T. Li³³, W. D. Li^1,42, W. G. Li¹, X. L. Li³³, X. N. Li^1,38, X. Q. Li³⁰, Y. B. Li², Z. B. Li³⁹, H. Liang^47,38, Y. F. Liang³⁶, Y. T. Liang²⁴, G. R. Liao¹¹, D. X. Lin¹⁴, B. Liu^34,h, B. J. Liu¹, C. X. Liu¹, D. Liu^47,38, F. H. Liu³⁵, Fang Liu¹, Feng Liu⁶, H. B. Liu¹², H. H. Liu¹⁶, H. H. Liu¹, H. M. Liu^1,42, J. Liu¹, J. B. Liu^47,38, J. P. Liu⁵², J. Y. Liu¹, K. Liu⁴⁰, K. Y. Liu²⁷, L. D. Liu³¹, P. L. Liu^1,38, Q. Liu⁴², S. B. Liu^47,38, X. Liu²⁶, Y. B. Liu³⁰, Y. Y. Liu³⁰, Z. A. Liu^1,38,42, Zhiqing Liu²², H. Loehner²⁵, Y. F. Long³¹, X. C. Lou^1,38,42, H. J. Lu¹⁷, J. G. Lu^1,38, Y. Lu¹, Y. P. Lu^1,38, C. L. Luo²⁸, M. X. Luo⁵³, T. Luo⁴³, X. L. Luo^1,38, X. R. Lyu⁴², F. C. Ma²⁷, H. L. Ma¹, L. L. Ma³³, M. M. Ma¹, Q. M. Ma¹, T. Ma¹, X. N. Ma³⁰, X. Y. Ma^1,38, Y. M. Ma³³, F. E. Maas¹⁴, M. Maggiora^50a,50c, Q. A. Malik⁴⁹, Y. J. Mao³¹, Z. P. Mao¹, S. Marcello^50a,50c, J. G. Messchendorp²⁵, G. Mezzadri^21b, J. Min^1,38, T. J. Min¹, R. E. Mitchell¹⁹, X. H. Mo^1,38,42, Y. J. Mo⁶, C. Morales Morales¹⁴, N. Yu. Muchnoi^9,d, H. Muramatsu⁴⁴, P. Musiol⁴, Y. Nefedov²³, F. Nerling¹⁰, I. B. Nikolaev^9,d, Z. Ning^1,38, S. Nisar⁸, S. L. Niu^1,38, X. Y. Niu¹, S. L. Olsen³², Q. Ouyang^1,38,42, S. Pacetti^20b, Y. Pan^47,38, M. Papenbrock⁵¹, P. Patteri^20a, M. Pelizaeus⁴, H. P. Peng^47,38, K. Peters^10,g, J. Pettersson⁵¹, J. L. Ping²⁸, R. G. Ping^1,42, R. Poling⁴⁴, V. Prasad¹, H. R. Qi², M. Qi²⁹, S. Qian^1,38, C. F. Qiao⁴², L. Q. Qin³³, N. Qin⁵², X. S. Qin¹, Z. H. Qin^1,38, J. F. Qiu¹, K. H. Rashid^49,I, C. F. Redmer²², M. Ripka²², G. Rong^1,42, Ch. Rosner¹⁴, X. D. Ruan¹², A. Sarantsev^23,e, M. Savrié^21b, C. Schnier⁴, K. Schoenning⁵¹, W. Shan³¹, M. Shao^47,38, C. P. Shen², P. X. Shen³⁰, X. Y. Shen^1,42, H. Y. Sheng¹, W. M. Song¹, X. Y. Song¹, S. Sosio^50a,50c, S. Spataro^50a,50c, G. X. Sun¹, J. F. Sun¹⁵, S. S. Sun^1,42, X. H. Sun¹, Y. J. Sun^47,38, Y. Z. Sun¹, Z. J. Sun^1,38, Z. T. Sun¹⁹, C. J. Tang³⁶, X. Tang¹, I. Tapan^41c, E. H. Thorndike⁴⁵, M. Tiemens²⁵, I. Uman^41d, G. S. Varner⁴³, B. Wang³⁰, B. L. Wang⁴², D. Wang³¹, D. Y. Wang³¹, K. Wang^1,38, L. L. Wang¹, L. S. Wang¹, M. Wang³³, P. Wang¹, P. L. Wang¹, W. Wang^1,38, W. P. Wang^47,38, X. F. Wang⁴⁰, Y. Wang³⁷, Y. D. Wang¹⁴, Y. F. Wang^1,38,42, Y. Q. Wang²², Z. Wang^1,38, Z. G. Wang^1,38, Z. H. Wang^47,38, Z. Y. Wang¹, Z. Y. Wang¹, T. Weber²², D. H. Wei¹¹, P. Weidenkaff²², S. P. Wen¹, U. Wiedner⁴, M. Wolke⁵¹, L. H. Wu¹, L. J. Wu¹, Z. Wu^1,38, L. Xia^47,38, L. G. Xia⁴⁰, Y. Xia¹⁸, D. Xiao¹, H. Xiao⁴⁸, Z. J. Xiao²⁸, Y. G. Xie^1,38, Y. H. Xie⁶, Q. L. Xiu^1,38, G. F. Xu¹, J. J. Xu¹, L. Xu¹, Q. J. Xu¹³, Q. N. Xu⁴², X. P. Xu³⁷, L. Yan^50a,50c, W. B. Yan^47,38, W. C. Yan^47,38, Y. H. Yan¹⁸, H. J. Yang^34,h, H. X. Yang¹, L. Yang⁵², Y. X. Yang¹¹, M. Ye^1,38, M. H. Ye⁷, J. H. Yin¹, Z. Y. You³⁹, B. X. Yu^1,38,42, C. X. Yu³⁰, J. S. Yu²⁶, C. Z. Yuan^1,42, Y. Yuan¹, A. Yuncu^41b,a, A. A. Zafar⁴⁹, Y. Zeng¹⁸, Z. Zeng^47,38, B. X. Zhang¹, B. Y. Zhang^1,38, C. C. Zhang¹, D. H. Zhang¹, H. H. Zhang³⁹, H. Y. Zhang^1,38, J. Zhang¹, J. J. Zhang¹, J. L. Zhang¹, J. Q. Zhang¹, J. W. Zhang^1,38,42, J. Y. Zhang¹, J. Z. Zhang^1,42, K. Zhang¹, L. Zhang¹, S. Q. Zhang³⁰, X. Y. Zhang³³, Y. Zhang¹, Y. Zhang¹, Y. H. Zhang^1,38, Y. N. Zhang⁴², Y. T. Zhang^47,38, Yu Zhang⁴², Z. H. Zhang⁶, Z. P. Zhang⁴⁷, Z. Y. Zhang⁵², G. Zhao¹, J. W. Zhao^1,38, J. Y. Zhao¹, J. Z. Zhao^1,38, Lei Zhao^47,38, Ling Zhao¹, M. G. Zhao³⁰, Q. Zhao¹, Q. W. Zhao¹, S. J. Zhao⁵⁴, T. C. Zhao¹, Y. B. Zhao^1,38, Z. G. Zhao^47,38, A. Zhemchugov^23,b, B. Zheng^48,14, J. P. Zheng^1,38, W. J. Zheng³³, Y. H. Zheng⁴², B. Zhong²⁸, L. Zhou^1,38, X. Zhou⁵², X. K. Zhou^47,38, X. R. Zhou^47,38, X. Y. Zhou¹, K. Zhu¹, K. J. Zhu^1,38,42, S. Zhu¹, S. H. Zhu⁴⁶, X. L. Zhu⁴⁰, Y. C. Zhu^47,38, Y. S. Zhu^1,42, Z. A. Zhu^1,42, J. Zhuang^1,38, L. Zotti^50a,50c, 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 Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan
⁹G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia
¹⁰GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany
¹¹Guangxi Normal University, Guilin 541004, People’s Republic of China
¹²Guangxi University, Nanning 530004, People’s Republic of China
¹³Hangzhou Normal University, Hangzhou 310036, People’s Republic of China
¹⁴Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
¹⁵Henan Normal University, Xinxiang 453007, People’s Republic of China
¹⁶Henan University of Science and Technology, Luoyang 471003, People’s Republic of China
¹⁷Huangshan College, Huangshan 245000, People’s Republic of China
¹⁸Hunan University, Changsha 410082, People’s Republic of China
¹⁹Indiana University, Bloomington, Indiana 47405, USA
^20aINFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy;
^20bINFN and University of Perugia, I-06100 Perugia, Italy
^21aINFN Sezione di Ferrara, I-44122 Ferrara, Italy
^21bUniversity of Ferrara, I-44122 Ferrara, Italy
²²Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
²³Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia
²⁴Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
²⁵KVI-CART, University of Groningen, NL-9747 AA Groningen, The Netherlands
²⁶Lanzhou University, Lanzhou 730000, People’s Republic of China
²⁷Liaoning University, Shenyang 110036, People’s Republic of China
²⁸Nanjing Normal University, Nanjing 210023, People’s Republic of China
²⁹Nanjing University, Nanjing 210093, People’s Republic of China
³⁰Nankai University, Tianjin 300071, People’s Republic of China
³¹Peking University, Beijing 100871, People’s Republic of China
³²Seoul National University, Seoul 151-747, Korea
³³Shandong University, Jinan 250100, People’s Republic of China
³⁴Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
³⁵Shanxi University, Taiyuan 030006, People’s Republic of China
³⁶Sichuan University, Chengdu 610064, People’s Republic of China
³⁷Soochow University, Suzhou 215006, People’s Republic of China
³⁸State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China
³⁹Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
⁴⁰Tsinghua University, Beijing 100084, People’s Republic of China
^41aAnkara University, 06100 Tandogan, Ankara, Turkey
^41bIstanbul Bilgi University, 34060 Eyup, Istanbul, Turkey
^41cUludag University, 16059 Bursa, Turkey
^41dNear East University, Nicosia, North Cyprus, Mersin 10, Turkey
⁴²University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
⁴³University of Hawaii, Honolulu, Hawaii 96822, USA
⁴⁴University of Minnesota, Minneapolis, Minnesota 55455, USA
⁴⁵University of Rochester, Rochester, New York 14627, USA
⁴⁶University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China
⁴⁷University of Science and Technology of China, Hefei 230026, People’s Republic of China
⁴⁸University of South China, Hengyang 421001, People’s Republic of China
⁴⁹University of the Punjab, Lahore 54590, Pakistan
^50aUniversity of Turin, I-10125 Turin, Italy
^50bUniversity of Eastern Piedmont, I-15121 Alessandria, Italy
^50cINFN, I-10125 Turin, Italy
⁵¹Uppsala University, Box 516, SE-75120 Uppsala, Sweden
⁵²Wuhan University, Wuhan 430072, People’s Republic of China
⁵³Zhejiang University, Hangzhou 310027, People’s Republic of China
⁵⁴Zhengzhou University, Zhengzhou 450001, People’s Republic of China

^aAlso at Bogazici University, 34342 Istanbul, Turkey.
^bAlso at the Moscow Institute of Physics and Technology, Moscow 141700, Russia.
^cAlso at the Functional Electronics Laboratory, Tomsk State University, Tomsk, 634050, Russia.
^dAlso at the Novosibirsk State University, Novosibirsk, 630090, Russia.
^eAlso at the NRC “Kurchatov Institute”, PNPI, 188300, Gatchina, Russia.
^fAlso at Istanbul Arel University, 34295 Istanbul, Turkey.
^gAlso at Goethe University Frankfurt, 60323 Frankfurt am Main, Germany.
^hAlso at Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education; Shanghai Key Laboratory for Particle Physics and Cosmology; Institute of Nuclear and Particle Physics, Shanghai 200240, People’s Republic of China.
^IGovernment College Women University, Sialkot—51310. Punjab, Pakistan.

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Phys. Rev. D 96, 012001 – Published 10 July, 2017

DOI: https://doi.org/10.1103/PhysRevD.96.012001

Abstract

We observe for the first time the process $e^{+} e^{-} \to η h_{c}$ with data collected by the BESIII experiment. Significant signals are observed at the center-of-mass energy $\sqrt{s} = 4.226 GeV$ , and the Born cross section is measured to be $(9. 5_{- 2.0}^{+ 2.2} \pm 2.7) pb$ . Evidence for $η h_{c}$ is observed at $\sqrt{s} = 4.358 GeV$ with a Born cross section of $(10. 0_{- 2.7}^{+ 3.1} \pm 2.6) pb$ , and upper limits on the production cross section at other center-of-mass energies between 4.085 and 4.600 GeV are determined.