29 Nisan 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

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    "description": "<p>Based on $\\left(27.12\u00b10.14\\right)\u00d7{10}^{8}\\text{}\\text{}\\psi \\left(2S\\right)$ events collected by the BESIII detector, we search for the decay ${\\eta }_{c}\\left(2S\\right)\\to {\\pi }^{+}{\\pi }^{-}{\\eta }_{c}$ via $\\psi \\left(2S\\right)\\to \\gamma {\\eta }_{c}\\left(2S\\right)$. No significant signal is observed, and the upper limit on the product branching fraction $B\\left(\\psi \\left(2S\\right)\\to \\gamma {\\eta }_{c}\\left(2S\\right)\\right)\u00d7B\\left({\\eta }_{c}\\left(2S\\right)\\to {\\pi }^{+}{\\pi }^{-}{\\eta }_{c}$) is determined to be $2.21\u00d7{10}^{-5}$ at the 90% confidence level. In addition, the ${\\eta }_{c}\\left(2S\\right)\\to {\\pi }^{+}{\\pi }^{-}{K}_{S}^{0}{K}^{\u00b1}{\\pi }^{\\mp }$ decay is studied via $\\psi \\left(2S\\right)\\to \\gamma {\\eta }_{c}\\left(2S\\right)$ and is observed with a statistical significance of $10\\sigma $ for the first time. The branching fraction of ${\\eta }_{c}\\left(2S\\right)\\to {\\pi }^{+}{\\pi }^{-}{K}_{S}^{0}{K}^{\u00b1}{\\pi }^{\\mp }$ is determined to be ($1.33\u00b10.11\u00b10.40\u00b10.95$)$\u00d7{10}^{-2}$, where the first uncertainty is statistical, the second is systematic, and the third uncertainty is due to the quoted $B\\left(\\psi \\left(2S\\right)\\to \\gamma {\\eta }_{c}\\left(2S\\right)\\right)$.</p>", 
    "doi": "10.1103/PhysRevD.109.072017", 
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      "issue": "7", 
      "title": "Physical Review D", 
      "volume": "109"
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    "title": "Search for ${\\eta }_{c}\\left(2S\\right)\\to {\\pi }^{+}{\\pi }^{-}{\\eta }_{c}$ and ${\\eta }_{c}\\left(2S\\right)\\to {\\pi }^{+}{\\pi }^{-}{K}_{S}^{0}{K}^{\u00b1}{\\pi }^{\\mp }$ decays"
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