Observation and study of the decay J/ψ→ϕηη′

Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; 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.; Cakir, O.; Calcaterra, A.; Cao, G. F.; Cetin, S. A.; Chai, J.; Chang, J. F.; Chelkov, G.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, P. 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.; Duan, P. F.; Fang, J.; Fang, S. S.; Fang, Y.; Farinelli, R.; Fava, L.; Fegan, S.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Fioravanti, E.; 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, M. H.; Gu, Y. T.; Guo, A. Q.; Guo, R. P.; Guo, Y. P.; Guskov, A.; Haddadi, Z.; Han, S.; Hao, X. Q.; Harris, F. A.; He, K. L.; He, X. Q.; 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.; Ikegami Andersson, W.; Irshad, M.; Ji, Q.; Ji, Q. P.; Ji, X. B.; Ji, X. L.; Jiang, X. S.; Jiang, X. Y.; Jiao, J. B.; Jiao, Z.; Jin, D. P.; Jin, S.; Jin, Y.; Johansson, T.; Julin, A.; 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.; Kornicer, M.; Kuemmel, M.; Kuessner, M.; Kupsc, A.; Kurth, M.; Kühn, W.; Lange, J. S.; Larin, P.; Lavezzi, L.; 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, Jin; Li, K. J.; Li, Kang; Li, Ke; 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, 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.; 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, 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, T.; 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.; Mitchell, R. E.; Mo, X. H.; Mo, Y. J.; Morales Morales, C.; Muchnoi, N. Yu.; Muramatsu, H.; Mustafa, A.; 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, H. R.; 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.; 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.; Song, J. J.; Song, W. M.; Song, X. Y.; Sosio, S.; Sowa, C.; Spataro, S.; 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.; Tapan, I.; Tiemens, M.; Tsednee, B.; Uman, I.; Wang, B.; Wang, B. L.; Wang, D.; Wang, D. Y.; Wang, Dan; Wang, K.; Wang, L. L.; Wang, L. S.; Wang, M.; 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Zhang, Yi; 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, X. Y.; Zhou, Xiaoyu; Zhou, Xu; Zhu, A. N.; Zhu, J.; Zhu, J.; Zhu, K.; Zhu, K. J.; Zhu, S.; 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.99.112008
Observation and study of the decay $J / ψ \to ϕ η η^{'}$

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 460 authors
We report the observation and study of the decay $J / ψ \to ϕ η η^{'}$ using $1.3 \times 1 0^{9}$ $J / ψ$ events collected with the BESIII detector. Its branching fraction, including all possible intermediate states, is measured to be $(2.32 \pm 0.06 \pm 0.16) \times 10^{- 4}$ . We also report evidence for a structure, denoted as $X$ , in the $ϕ η^{'}$ mass spectrum in the $2.0 - 2.1 GeV / c^{2}$ region. Using two decay modes of the $η^{'}$ meson ( $γ π^{+} π^{-}$ and $η π^{+} π^{-}$ ), a simultaneous fit to the $ϕ η^{'}$ mass spectra is performed. Assuming the quantum numbers of the $X$ to be $J^{P} = 1^{-}$ , its significance is found to be $4.4 σ$ , with a mass and width of $(2002.1 \pm 27.5 \pm 21.4) MeV / c^{2}$ and $(129 \pm 17 \pm 9) MeV$ , respectively, and a product branching fraction $B (J / ψ \to η X) \times B (X \to ϕ η^{'}) = (9.8 \pm 1.2 \pm 1.7) \times 10^{- 5}$ . Alternatively, assuming $J^{P} = 1^{+}$ , the significance is $3.8 σ$ , with a mass and width of $(2062.8 \pm 13.1 \pm 7.2) MeV / c^{2}$ and $(177 \pm 36 \pm 35) MeV$ , respectively, and a product branching fraction $B (J / ψ \to η X) \times B (X \to ϕ η^{'}) = (9.6 \pm 1.4 \pm 2.0) \times 10^{- 5}$ . The angular distribution of $J / ψ \to η X$ is studied and the two $J^{P}$ assumptions of the $X$ cannot be clearly distinguished due to the limited statistics. In all measurements the first uncertainties are statistical and the second systematic.
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  "titles": [
    {
      "source": "APS", 
      "title": "Observation and study of the decay <math><mi>J</mi><mo>/</mo><mi>\u03c8</mi><mo>\u2192</mo><mi>\u03d5</mi><mi>\u03b7</mi><msup><mi>\u03b7</mi><mo>\u2032</mo></msup></math>"
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      "value": "10.1103/PhysRevD.99.112008"
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      "journal_volume": "99", 
      "journal_title": "Physical Review D", 
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      "journal_issue": "11", 
      "year": 2019
    }
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  "page_nr": [
    10
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  "copyright": [
    {
      "statement": "Published by the American Physical Society", 
      "year": "2019"
    }
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  "control_number": "48098", 
  "collaborations": [
    {
      "value": "BESIII Collaboration"
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      "value": "1901.00085"
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  "abstracts": [
    {
      "source": "APS", 
      "value": "We report the observation and study of the decay <math><mi>J</mi><mo>/</mo><mi>\u03c8</mi><mo>\u2192</mo><mi>\u03d5</mi><mi>\u03b7</mi><msup><mi>\u03b7</mi><mo>\u2032</mo></msup></math> using <math><mn>1.3</mn><mo>\u00d7</mo><mrow><mn>1</mn><msup><mn>0</mn><mn>9</mn></msup></mrow></math> <math><mi>J</mi><mo>/</mo><mi>\u03c8</mi></math> events collected with the BESIII detector. Its branching fraction, including all possible intermediate states, is measured to be <math><mrow><mo>(</mo><mn>2.32</mn><mo>\u00b1</mo><mn>0.06</mn><mo>\u00b1</mo><mn>0.16</mn><mo>)</mo><mo>\u00d7</mo><mrow><msup><mrow><mn>10</mn></mrow><mrow><mo>\u2212</mo><mn>4</mn></mrow></msup></mrow></mrow></math>. We also report evidence for a structure, denoted as <math><mi>X</mi></math>, in the <math><mi>\u03d5</mi><msup><mi>\u03b7</mi><mo>\u2032</mo></msup></math> mass spectrum in the <math><mrow><mn>2.0</mn><mi>\u2013</mi><mn>2.1</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi><mo>/</mo><msup><mrow><mi>c</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math> region. Using two decay modes of the <math><msup><mi>\u03b7</mi><mo>\u2032</mo></msup></math> meson (<math><mi>\u03b3</mi><msup><mi>\u03c0</mi><mo>+</mo></msup><msup><mi>\u03c0</mi><mo>\u2212</mo></msup></math> and <math><mi>\u03b7</mi><msup><mi>\u03c0</mi><mo>+</mo></msup><msup><mi>\u03c0</mi><mo>\u2212</mo></msup></math>), a simultaneous fit to the <math><mi>\u03d5</mi><msup><mi>\u03b7</mi><mo>\u2032</mo></msup></math> mass spectra is performed. Assuming the quantum numbers of the <math><mi>X</mi></math> to be <math><msup><mi>J</mi><mi>P</mi></msup><mo>=</mo><msup><mn>1</mn><mo>\u2212</mo></msup></math>, its significance is found to be <math><mrow><mn>4.4</mn><mi>\u03c3</mi></mrow></math>, with a mass and width of <math><mrow><mo>(</mo><mn>2002.1</mn><mo>\u00b1</mo><mn>27.5</mn><mo>\u00b1</mo><mn>21.4</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><mo>(</mo><mn>129</mn><mo>\u00b1</mo><mn>17</mn><mo>\u00b1</mo><mn>9</mn><mo>)</mo><mtext> </mtext><mtext> </mtext><mi>MeV</mi></math>, respectively, and a product branching fraction <math><mrow><mi>B</mi><mo>(</mo><mi>J</mi><mo>/</mo><mi>\u03c8</mi><mo>\u2192</mo><mi>\u03b7</mi><mi>X</mi><mo>)</mo><mo>\u00d7</mo><mi>B</mi><mo>(</mo><mi>X</mi><mo>\u2192</mo><mi>\u03d5</mi><msup><mrow><mi>\u03b7</mi></mrow><mrow><mo>\u2032</mo></mrow></msup><mo>)</mo><mo>=</mo><mo>(</mo><mn>9.8</mn><mo>\u00b1</mo><mn>1.2</mn><mo>\u00b1</mo><mn>1.7</mn><mo>)</mo><mo>\u00d7</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>\u2212</mo><mn>5</mn></mrow></msup></mrow></math>. Alternatively, assuming <math><msup><mi>J</mi><mi>P</mi></msup><mo>=</mo><msup><mn>1</mn><mo>+</mo></msup></math>, the significance is <math><mrow><mn>3.8</mn><mi>\u03c3</mi></mrow></math>, with a mass and width of <math><mrow><mo>(</mo><mn>2062.8</mn><mo>\u00b1</mo><mn>13.1</mn><mo>\u00b1</mo><mn>7.2</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><mo>(</mo><mn>177</mn><mo>\u00b1</mo><mn>36</mn><mo>\u00b1</mo><mn>35</mn><mo>)</mo><mtext> </mtext><mtext> </mtext><mi>MeV</mi></math>, respectively, and a product branching fraction <math><mi>B</mi><mo>(</mo><mi>J</mi><mo>/</mo><mi>\u03c8</mi><mo>\u2192</mo><mi>\u03b7</mi><mi>X</mi><mo>)</mo><mo>\u00d7</mo><mspace></mspace><mi>B</mi><mo>(</mo><mi>X</mi><mo>\u2192</mo><mi>\u03d5</mi><msup><mi>\u03b7</mi><mo>\u2032</mo></msup><mo>)</mo><mo>=</mo><mo>(</mo><mn>9.6</mn><mo>\u00b1</mo><mn>1.4</mn><mo>\u00b1</mo><mn>2.0</mn><mo>)</mo><mo>\u00d7</mo><msup><mn>10</mn><mrow><mo>\u2212</mo><mn>5</mn></mrow></msup></math>. The angular distribution of <math><mi>J</mi><mo>/</mo><mi>\u03c8</mi><mo>\u2192</mo><mi>\u03b7</mi><mi>X</mi></math> is studied and the two <math><msup><mi>J</mi><mi>P</mi></msup></math> assumptions of the <math><mi>X</mi></math> cannot be clearly distinguished due to the limited statistics. In all measurements the first uncertainties are statistical and the second systematic."
    }
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  "imprints": [
    {
      "date": "2019-06-18", 
      "publisher": "APS"
    }
  ]
}
Published on:: 18 June 2019
Publisher:: APS
Published in:: Physical Review D , Volume 99 (2019)
Issue 11
DOI:: https://doi.org/10.1103/PhysRevD.99.112008
arXiv:: 1901.00085
Copyrights:: Published by the American Physical Society
Licence:: CC-BY-4.0
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