Observation of ηcωω in J/ψγωω

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±7.0)×106 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 (11S0) charmonium state ηc into a pair of ω mesons in the process J/ψγωω. The branching fraction is measured for the first time to be B(ηcωω)=(2.88±0.10±0.46±0.68)×103, where the first uncertainty is statistical, the second systematic, and the third is from the uncertainty of B(J/ψγηc). The mass and width of the ηc are determined as M=(2985.9±0.7±2.1) MeV/c2 and Γ=(33.8±1.6±4.1) MeV.

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    {
      "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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