8 Nisan 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

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        "name": "CERN \u0130\u015fbirli\u011fi"
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    "description": "<p>Using a data sample corresponding to an integrated luminosity of $10.9\\text{}\\text{}{\\mathrm{fb}}^{-1}$ collected at center-of-mass energies from 4.16 to 4.34 GeV with the BESIII detector, we search for the decay ${\\chi }_{c1}\\left(3872\\right)\\to {\\pi }^{+}{\\pi }^{-}{\\chi }_{c1}$ in the radiative production ${e}^{+}{e}^{-}\\to \\gamma {\\chi }_{c1}\\left(3872\\right)$. No significant signal is observed, and the ratio for the branching fraction of ${\\chi }_{c1}\\left(3872\\right)\\to {\\pi }^{+}{\\pi }^{-}{\\chi }_{c1}$ to ${\\chi }_{c1}\\left(3872\\right)\\to {\\pi }^{+}{\\pi }^{-}J/\\psi $ is measured as $R\\equiv \\frac{B\\left[{\\chi }_{c1}\\left(3872\\right)\\to {\\pi }^{+}{\\pi }^{-}{\\chi }_{c1}\\right]}{B\\left[{\\chi }_{c1}\\left(3872\\right)\\to {\\pi }^{+}{\\pi }^{-}J/\\psi \\right]}&lt;0.18$ at 90% confidence level. An upper limit on the product of the cross section $\\sigma \\left[{e}^{+}{e}^{-}\\to \\gamma {\\chi }_{c1}\\left(3872\\right)\\right]$ and the branching fraction $B\\left[{\\chi }_{c1}\\left(3872\\right)\\to {\\pi }^{+}{\\pi }^{-}{\\chi }_{c1}\\right]$ at each center-of-mass energy is also given. These measurements favor the nonconventional charmonium nature of the ${\\chi }_{c1}\\left(3872\\right)$ state.</p>", 
    "doi": "10.1103/PhysRevD.109.L071101", 
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    "journal": {
      "issue": "7", 
      "title": "Physical Review D", 
      "volume": "109"
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    "publication_date": "2024-04-08", 
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      "title": "Dergi makalesi", 
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    "science_branches": [
      "Temel Bilimler > Fizik"
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    "title": "Search for the decay ${\\chi }_{c1}\\left(3872\\right)\\to {\\pi }^{+}{\\pi }^{-}{\\chi }_{c1}$"
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