29 Nisan 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

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{
  "@context": "https://schema.org/", 
  "@id": 275113, 
  "@type": "ScholarlyArticle", 
  "creator": [
    {
      "@type": "Person", 
      "affiliation": "CERN", 
      "name": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "datePublished": "2024-04-29", 
  "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>", 
  "headline": "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", 
  "identifier": 275113, 
  "image": "https://aperta.ulakbim.gov.tr/static/img/logo/aperta_logo_with_icon.svg", 
  "license": "http://www.opendefinition.org/licenses/cc-by", 
  "name": "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", 
  "url": "https://aperta.ulakbim.gov.tr/record/275113"
}