8 Ağustos 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

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    "description": "<p>Using a sample of $448.1\u00d7{10}^{6}$ $\\psi \\left(2S\\right)$ events collected with the BESIII detector, we perform a study of the decay $J/\\psi \\to {K}^{+}{K}^{-}$ via $\\psi \\left(2S\\right)\\to {\\pi }^{+}{\\pi }^{-}J/\\psi $. The branching fraction of $J/\\psi \\to {K}^{+}{K}^{-}$ is determined to be ${B}_{{K}^{+}{K}^{-}}=\\left(3.072\u00b10.023\\left(\\mathrm{stat}\\right)\u00b10.050\\left(\\mathrm{syst}\\right)\\right)\u00d7{10}^{-4}$, which is consistent with previous measurements but with significantly improved precision.</p>", 
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      "issue": "3", 
      "title": "Physical Review D", 
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    "title": "Precision measurement of the branching fraction of $J/\\psi \\to {K}^{+}{K}^{-}$ via $\\psi \\left(2S\\right)\\to {\\pi }^{+}{\\pi }^{-}J/\\psi $"
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