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Observation of e+e−→ηY(2175) at center-of-mass energies above 3.7 GeV

M. Ablikim1, M. N. Achasov9,d, S. Ahmed14, X. C. Ai1, O. Albayrak5, M. Albrecht4, D. J. Ambrose45, A. Amoroso50a,50c, F. F. An1 et al. (BESIII Collaboration)

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Garzia21a, K. Goetzen10, L. Gong30, W. X. Gong1,38, W. Gradl22, M. Greco50a,50c, M. H. Gu1,38, 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. He1,42, F. H. Heinsius4, T. Held4, Y. K. Heng1,38,42, T. Holtmann4, Z. L. Hou1, C. Hu28, H. M. Hu1,42, T. Hu1,38,42, Y. Hu1, G. S. Huang47,38, J. S. Huang15, X. T. Huang33, X. Z. Huang29, Z. L. Huang27, T. Hussain49, W. Ikegami Andersson51, Q. Ji1, Q. P. Ji15, X. B. Ji1,42, X. L. Ji1,38, L. W. Jiang52, X. S. Jiang1,38,42, X. Y. Jiang30, J. B. Jiao33, Z. Jiao17, D. P. Jin1,38,42, S. Jin1,42, 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. Kolcu41b,f, B. Kopf4, M. Kornicer43, A. Kupsc51, W. Kühn24, J. S. Lange24, M. Lara19, P. Larin14, H. Leithoff22, C. Leng50c, C. Li51, Cheng Li47,38, D. M. Li54, F. Li1,38, F. Y. Li31, G. Li1, H. B. 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Min1,38, T. J. Min1, R. E. Mitchell19, X. H. Mo1,38,42, Y. J. Mo6, C. Morales Morales14, G. Morello20a, N. Yu. Muchnoi9,d, H. Muramatsu44, P. Musiol4, Y. Nefedov23, F. Nerling10, I. B. Nikolaev9,d, Z. Ning1,38, S. Nisar8, S. L. Niu1,38, X. Y. Niu1, S. L. Olsen32, Q. Ouyang1,38,42, S. Pacetti20b, Y. Pan47,38, M. Papenbrock51, P. Patteri20a, M. Pelizaeus4, H. P. Peng47,38, K. Peters10,g, J. Pettersson51, J. L. Ping28, R. G. Ping1,42, R. Poling44, V. Prasad1, H. R. Qi2, M. Qi29, S. Qian1,38, C. F. Qiao42, L. Q. Qin33, N. Qin52, X. S. Qin1, Z. H. Qin1,38, J. F. Qiu1, K. H. Rashid49,i, C. F. Redmer22, M. Ripka22, G. Rong1,42, Ch. Rosner14, X. D. Ruan12, A. Sarantsev23,e, M. Savrié21b, C. Schnier4, K. Schoenning51, W. Shan31, M. Shao47,38, C. P. Shen2, P. X. Shen30, X. Y. Shen1,42, H. Y. Sheng1, W. M. Song1, X. Y. Song1, S. Sosio50a,50c, S. Spataro50a,50c, G. X. Sun1, J. F. Sun15, S. S. Sun1,42, X. H. Sun1, Y. J. Sun47,38, Y. Z. Sun1, Z. J. Sun1,38, Z. T. Sun19, C. J. Tang36, X. Tang1, I. Tapan41c, E. H. Thorndike45, M. Tiemens25, I. Uman41d, G. S. Varner43, B. Wang30, B. L. Wang42, D. Wang31, D. Y. Wang31, K. Wang1,38, L. L. Wang1, L. S. Wang1, M. Wang33, P. Wang1, P. L. Wang1, W. Wang1,38, W. P. Wang47,38, X. F. Wang40, Y. Wang37, Y. D. Wang14, Y. F. Wang1,38,42, Y. Q. Wang22, Z. Wang1,38, Z. G. Wang1,38, Z. Y. Wang1, Zongyuan Wang1, T. Weber22, D. H. Wei11, P. Weidenkaff22, S. P. Wen1, U. Wiedner4, M. Wolke51, L. H. Wu1, L. J. Wu1, Z. Wu1,38, L. Xia47,38, L. G. Xia40, Y. Xia18, D. Xiao1, H. Xiao48, Z. J. Xiao28, Y. G. Xie1,38, Y. H. Xie6, Q. L. Xiu1,38, G. F. Xu1, J. J. Xu1, L. Xu1, Q. J. Xu13, Q. N. Xu42, X. P. Xu37, L. Yan50a,50c, W. B. Yan47,38, Y. H. Yan18, H. J. Yang34,h, H. X. Yang1, L. Yang52, Y. X. Yang11, M. Ye1,38, M. H. Ye7, J. H. Yin1, Z. Y. You39, B. X. Yu1,38,42, C. X. Yu30, J. S. Yu26, C. Z. Yuan1,42, Y. Yuan1, A. Yuncu41b,a, A. A. Zafar49, Y. Zeng18, Z. Zeng47,38, B. X. Zhang1, B. Y. Zhang1,38, C. C. Zhang1, D. H. Zhang1, H. H. Zhang39, H. Y. 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  • 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.
  • iAlso at Government College Women University, Sialkot—51310 Punjab, Pakistan.
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Phys. Rev. D 99, 012014 – Published 31 January, 2019

DOI: https://doi.org/10.1103/PhysRevD.99.012014

Abstract

The state Y(2175) is observed in the process e+e−→ηY(2175) with a statistical significance larger than 10 standard deviations using the data collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies between 3.7 and 4.6 GeV. This is the first observation of the Y(2175) in this process. The mass and width of the Y(2175) are determined to be (2135±8±9)  MeV/c2 and (104±24±12)  MeV, respectively, and the production cross section (σ) of e+e−→ηY(2175)→ηϕf0(980)→ηϕπ+π− is at the several hundred femtobarn level. No significant signal for the process e+e−→η′Y(2175) is observed and the upper limit on σ(e+e−→η′Y(2175))/σ(e+e−→ηY(2175)) is estimated to be 0.43 at the 90% confidence level. We also search for ψ(3686)→ηY(2175). No significant signal is observed, indicating a strong suppression relative to the corresponding J/ψ decay, in violation of the “12% rule”.

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Phys. Rev. D 99, 012014– Published 31 January, 2019
  • Received 14 September 2017
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