29 Nisan 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

Citation Style Language JSON

{
  "DOI": "10.1103/PhysRevD.109.072017", 
  "abstract": "<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>", 
  "author": [
    {
      "family": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "container_title": "Physical Review D", 
  "id": "275113", 
  "issue": "7", 
  "issued": {
    "date-parts": [
      [
        2024, 
        4, 
        29
      ]
    ]
  }, 
  "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", 
  "type": "article-journal", 
  "volume": "109"
}