Observation of ηc→ωω in J/ψ→γωω

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, Y.; Bakina, O.; Ferroli, R. Baldini; Ban, Y.; Begzsuren, K.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.; Boger, E.; Boyko, I.; Briere, R. A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cetin, S. A.; Chai, J.; Chang, J. F.; Chang, W. L.; Chelkov, G.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, S. J.; Chen, X. R.; Chen, Y. B.; Cheng, W.; Chu, X. K.; Cibinetto, G.; Cossio, F.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, Y.; Dong, C.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dou, Z. L.; Du, S. X.; Fan, J. Z.; Fang, J.; Fang, S. S.; Fang, Y.; Farinelli, R.; Fava, L.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Fritsch, M.; Fu, C. D.; Gao, Q.; Gao, X. L.; Gao, Y.; Gao, Y. G.; Gao, Z.; Garillon, B.; Garzia, I.; Gilman, A.; Goetzen, K.; Gong, L.; Gong, W. X.; Gradl, W.; Greco, M.; Gu, L. M.; Gu, M. H.; Gu, Y. T.; Guo, A. Q.; Guo, L. B.; Guo, R. P.; Guo, Y. P.; Guskov, A.; Han, S.; Hao, X. Q.; Harris, F. A.; He, K. L.; Heinsius, F. H.; Held, T.; Heng, Y. K.; Hou, Z. L.; Hu, H. M.; Hu, J. F.; Hu, T.; Hu, Y.; Huang, G. S.; Huang, J. S.; Huang, X. T.; Huang, X. Z.; Huang, Z. L.; Hussain, T.; Hüsken, N.; Andersson, W. Ikegami; Imoehl, W.; Irshad, M.; Ji, Q.; Ji, Q. P.; Ji, X. B.; Ji, X. L.; Jiang, H. L.; Jiang, X. S.; Jiang, X. Y.; Jiao, J. B.; Jiao, Z.; Jin, D. P.; Jin, S.; Jin, Y.; Johansson, T.; Kalantar-Nayestanaki, N.; Kang, X. S.; Kavatsyuk, M.; Ke, B. C.; Keshk, I. K.; Khan, T.; Khoukaz, A.; Kiese, P.; Kiuchi, R.; Kliemt, R.; Koch, L.; Kolcu, O. B.; Kopf, B.; Kuemmel, M.; Kuessner, M.; Kupsc, A.; Kurth, M.; Kühn, W.; Lange, J. S.; Larin, P.; Lavezzi, L.; Leiber, S.; Leithoff, H.; Li, C.; Li, Cheng; Li, D. M.; Li, F.; Li, F. Y.; Li, G.; Li, H. B.; Li, H. J.; Li, J. C.; Li, J. W.; Li, K. J.; Li, Kang; Li, Ke; Li, L. K.; Li, Lei; Li, P. L.; Li, P. R.; Li, Q. Y.; Li, W. D.; Li, W. G.; Li, X. L.; Li, X. N.; Li, X. Q.; Li, X. L.; Li, Z. B.; Liang, H.; Liang, Y. F.; Liang, Y. T.; Liao, G. R.; Liao, L. Z.; Libby, J.; Lin, C. X.; Lin, D. X.; Liu, B.; Liu, B. J.; Liu, C. X.; Liu, D.; Liu, D. Y.; Liu, F. H.; Liu, Fang; Liu, Feng; Liu, H. B.; Liu, H. L.; Liu, H. M.; Liu, Huanhuan; Liu, Huihui; Liu, J. B.; Liu, J. Y.; Liu, K. Y.; Liu, Ke; Liu, L. D.; Liu, Q.; Liu, S. B.; Liu, X.; Liu, Y. B.; Liu, Z. A.; Liu, Zhiqing; Long, Y. F.; Lou, X. C.; Lu, H. J.; Lu, J. G.; Lu, Y.; Lu, Y. P.; Luo, C. L.; Luo, M. X.; Luo, P. W.; Luo, T.; Luo, X. L.; Lusso, S.; Lyu, X. R.; Ma, F. C.; Ma, H. L.; Ma, L. L.; Ma, M. M.; Ma, Q. M.; Ma, X. N.; Ma, X. Y.; Ma, Y. M.; Maas, F. E.; Maggiora, M.; Maldaner, S.; Malik, Q. A.; Mangoni, A.; Mao, Y. J.; Mao, Z. P.; Marcello, S.; Meng, Z. X.; Messchendorp, J. G.; Mezzadri, G.; Min, J.; Min, T. J.; Mitchell, R. E.; Mo, X. H.; Mo, Y. J.; Morales, C. Morales; Muchnoi, N. Yu.; Muramatsu, H.; Mustafa, A.; Nakhoul, S.; Nefedov, Y.; Nerling, F.; Nikolaev, I. B.; Ning, Z.; Nisar, S.; Niu, S. L.; Niu, X. Y.; Olsen, S. L.; Ouyang, Q.; Pacetti, S.; Pan, Y.; Papenbrock, M.; Patteri, P.; Pelizaeus, M.; Pellegrino, J.; Peng, H. P.; Peng, Z. Y.; Peters, K.; Pettersson, J.; Ping, J. L.; Ping, R. G.; Pitka, A.; Poling, R.; Prasad, V.; Qi, M.; Qi, T. Y.; Qian, S.; Qiao, C. F.; Qin, N.; Qin, X. S.; Qin, Z. H.; Qiu, J. F.; Qu, S. Q.; Rashid, K. H.; Redmer, C. F.; Richter, M.; Ripka, M.; Rivetti, A.; Rolo, M.; Rong, G.; Rosner, Ch.; Rump, M.; Sarantsev, A.; Savrié, M.; Schoenning, K.; Shan, W.; Shan, X. Y.; Shao, M.; Shen, C. P.; Shen, P. X.; Shen, X. Y.; Sheng, H. Y.; Shi, X.; Shi, X. D.; Song, J. J.; Song, Q. Q.; Song, X. Y.; Sosio, S.; Sowa, C.; Spataro, S.; Sui, F. F.; Sun, G. X.; Sun, J. F.; Sun, L.; Sun, S. S.; Sun, X. H.; Sun, Y. J.; Sun, Y. K.; Sun, Y. Z.; Sun, Z. J.; Sun, Z. T.; Tan, Y. T.; Tang, C. J.; Tang, G. Y.; Tang, X.; Tsednee, B.; Uman, I.; Wang, B.; Wang, B. L.; Wang, C. W.; Wang, D.; Wang, D. Y.; Wang, H. H.; Wang, K.; Wang, L. L.; Wang, L. S.; Wang, M.; Wang, Meng; Wang, P.; Wang, P. L.; Wang, W. P.; Wang, X. F.; Wang, Y.; Wang, Y. F.; Wang, Z.; Wang, Z. G.; Wang, Z. Y.; Wang, Zongyuan; Weber, T.; Wei, D. H.; Weidenkaff, P.; Wen, S. P.; Wiedner, U.; Wolke, M.; Wu, L. H.; Wu, L. J.; Wu, Z.; Xia, L.; Xia, Y.; Xiao, Y. J.; Xiao, Z. J.; Xie, Y. G.; Xie, Y. H.; Xiong, X. A.; Xiu, Q. L.; Xu, G. F.; Xu, J. J.; Xu, L.; Xu, Q. J.; Xu, X. P.; Yan, F.; Yan, L.; Yan, W. B.; Yan, W. C.; Yan, Y. H.; Yang, H. J.; Yang, H. X.; Yang, L.; Yang, R. X.; Yang, S. L.; Yang, Y. H.; Yang, Y. X.; Yang, Yifan; Yang, Z. Q.; Ye, M.; Ye, M. H.; Yin, J. H.; You, Z. Y.; Yu, B. X.; Yu, C. X.; Yu, J. S.; Yuan, C. Z.; Yuan, Y.; Yuncu, A.; Zafar, A. A.; Zeng, Y.; Zhang, B. X.; Zhang, B. Y.; Zhang, C. C.; Zhang, D. H.; Zhang, H. H.; Zhang, H. Y.; Zhang, J.; Zhang, J. L.; Zhang, J. Q.; Zhang, J. W.; Zhang, J. Y.; Zhang, J. Z.; Zhang, K.; Zhang, L.; Zhang, S. F.; Zhang, T. J.; Zhang, X. Y.; Zhang, Y.; Zhang, Y. H.; Zhang, Y. T.; Zhang, Yang; Zhang, Yao; Zhang, Yu; Zhang, Z. H.; Zhang, Z. P.; Zhang, Z. Y.; Zhao, G.; Zhao, J. W.; Zhao, J. Y.; Zhao, J. Z.; Zhao, Lei; Zhao, Ling; Zhao, M. G.; Zhao, Q.; Zhao, S. J.; Zhao, T. C.; Zhao, Y. B.; Zhao, Z. G.; Zhemchugov, A.; Zheng, B.; Zheng, J. P.; Zheng, Y. H.; Zhong, B.; Zhou, L.; Zhou, Q.; Zhou, X.; Zhou, X. K.; Zhou, X. R.; Zhou, Xiaoyu; Zhou, Xu; Zhu, A. N.; Zhu, J.; Zhu, J.; Zhu, K.; Zhu, K. J.; Zhu, S. H.; Zhu, X. L.; Zhu, Y. C.; Zhu, Y. S.; Zhu, Z. A.; Zhuang, J.; Zou, B. S.; Zou, J. H.
doi:10.1103/PhysRevD.100.052012
Observation of $η_{c} \to ω ω$ in $J / ψ \to γ ω ω$

M. Ablikim (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; M. N. Achasov (G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia) ; S. Ahmed (Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany) ; M. Albrecht (Bochum Ruhr-University, D-44780 Bochum, Germany) ; M. Alekseev (University of Turin, I-10125, Turin, Italy; INFN, I-10125, Turin, Italy) ; et al. - Show all 456 authors
Using a sample of $(1310.6 \pm 7.0) \times 10^{6}$ $J / ψ$ events recorded with the Beijing Spectrometer III detector at the Beijing Electron Positron Collider II, we report the observation of the decay of the $(1^{1} S_{0})$ charmonium state $η_{c}$ into a pair of $ω$ mesons in the process $J / ψ \to γ ω ω$ . The branching fraction is measured for the first time to be $B (η_{c} \to ω ω) = (2.88 \pm 0.10 \pm 0.46 \pm 0.68) \times 10^{- 3}$ , where the first uncertainty is statistical, the second systematic, and the third is from the uncertainty of $B (J / ψ \to γ η_{c})$ . The mass and width of the $η_{c}$ are determined as $M = (2985.9 \pm 0.7 \pm 2.1) MeV / c^{2}$ and $Γ = (33.8 \pm 1.6 \pm 4.1) MeV$ .
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  "titles": [
    {
      "source": "APS", 
      "title": "Observation of <math><msub><mi>\u03b7</mi><mi>c</mi></msub><mo>\u2192</mo><mi>\u03c9</mi><mi>\u03c9</mi></math> in <math><mi>J</mi><mo>/</mo><mi>\u03c8</mi><mo>\u2192</mo><mi>\u03b3</mi><mi>\u03c9</mi><mi>\u03c9</mi></math>"
    }
  ], 
  "dois": [
    {
      "value": "10.1103/PhysRevD.100.052012"
    }
  ], 
  "publication_info": [
    {
      "journal_volume": "100", 
      "journal_title": "Physical Review D", 
      "material": "article", 
      "journal_issue": "5", 
      "year": 2019
    }
  ], 
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  "acquisition_source": {
    "date": "2021-08-25T10:38:41.282442", 
    "source": "APS", 
    "method": "APS", 
    "submission_number": "810b323c058f11ecb53772fd3742099d"
  }, 
  "page_nr": [
    13
  ], 
  "license": [
    {
      "url": "https://creativecommons.org/licenses/by/4.0/", 
      "license": "CC-BY-4.0"
    }
  ], 
  "copyright": [
    {
      "statement": "Published by the American Physical Society", 
      "year": "2019"
    }
  ], 
  "control_number": "49909", 
  "collaborations": [
    {
      "value": "BESIII Collaboration"
    }
  ], 
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  "record_creation_date": "2019-09-23T18:30:07.545967", 
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      "primary": "HEP"
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      "primary": "Citeable"
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      "primary": "Published"
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  "arxiv_eprints": [
    {
      "categories": [
        "hep-ex"
      ], 
      "value": "1905.10318"
    }
  ], 
  "abstracts": [
    {
      "source": "APS", 
      "value": "Using a sample of <math><mrow><mo>(</mo><mn>1310.6</mn><mo>\u00b1</mo><mn>7.0</mn><mo>)</mo><mo>\u00d7</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>6</mn></mrow></msup></mrow></math> <math><mrow><mi>J</mi><mo>/</mo><mi>\u03c8</mi></mrow></math> events recorded with the Beijing Spectrometer III detector at the Beijing Electron Positron Collider II, we report the observation of the decay of the <math><mrow><mo>(</mo><msup><mrow><mn>1</mn></mrow><mrow><mn>1</mn></mrow></msup><msub><mrow><mi>S</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>)</mo></mrow></math> charmonium state <math><msub><mi>\u03b7</mi><mi>c</mi></msub></math> into a pair of <math><mi>\u03c9</mi></math> mesons in the process <math><mi>J</mi><mo>/</mo><mi>\u03c8</mi><mo>\u2192</mo><mi>\u03b3</mi><mi>\u03c9</mi><mi>\u03c9</mi></math>. The branching fraction is measured for the first time to be <math><mrow><mi>B</mi><mo>(</mo><msub><mrow><mi>\u03b7</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>\u2192</mo><mi>\u03c9</mi><mi>\u03c9</mi><mo>)</mo><mo>=</mo><mo>(</mo><mn>2.88</mn><mo>\u00b1</mo><mn>0.10</mn><mo>\u00b1</mo><mn>0.46</mn><mo>\u00b1</mo><mn>0.68</mn><mo>)</mo><mo>\u00d7</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>\u2212</mo><mn>3</mn></mrow></msup></mrow></math>, where the first uncertainty is statistical, the second systematic, and the third is from the uncertainty of <math><mi>B</mi><mo>(</mo><mi>J</mi><mo>/</mo><mi>\u03c8</mi><mo>\u2192</mo><mi>\u03b3</mi><msub><mi>\u03b7</mi><mi>c</mi></msub><mo>)</mo></math>. The mass and width of the <math><msub><mi>\u03b7</mi><mi>c</mi></msub></math> are determined as <math><mrow><mi>M</mi><mo>=</mo><mo>(</mo><mn>2985.9</mn><mo>\u00b1</mo><mn>0.7</mn><mo>\u00b1</mo><mn>2.1</mn><mo>)</mo><mtext> </mtext><mtext> </mtext><mi>MeV</mi><mo>/</mo><msup><mrow><mi>c</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math> and <math><mrow><mi>\u0393</mi><mo>=</mo><mo>(</mo><mn>33.8</mn><mo>\u00b1</mo><mn>1.6</mn><mo>\u00b1</mo><mn>4.1</mn><mo>)</mo><mtext> </mtext><mtext> </mtext><mi>MeV</mi></mrow></math>."
    }
  ], 
  "imprints": [
    {
      "date": "2019-09-23", 
      "publisher": "APS"
    }
  ]
}
Published on:: 23 September 2019
Publisher:: APS
Published in:: Physical Review D , Volume 100 (2019)
Issue 5
DOI:: https://doi.org/10.1103/PhysRevD.100.052012
arXiv:: 1905.10318
Copyrights:: Published by the American Physical Society
Licence:: CC-BY-4.0
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