9 Mayıs 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

Citation Style Language JSON

{
  "DOI": "10.1103/PhysRevLett.132.191902", 
  "abstract": "<p>We report the measurement of the inclusive cross sections for ${e}^{+}{e}^{-}\\to \\mathrm{nOCH}$ (where nOCH denotes non-open charm hadrons) with improved precision at center-of-mass (c.m.) energies from 3.645 to 3.871 GeV. We observe three resonances: $R\\left(3760\\right)$, $R\\left(3780\\right)$, and $R\\left(3810\\right)$ with significances of $8.1\\sigma $, $13.7\\sigma $, and $8.8\\sigma $, respectively. The $R\\left(3810\\right)$ state is observed for the first time, while the $R\\left(3760\\right)$ and $R\\left(3780\\right)$ states are observed for the first time in the nOCH cross sections. Two sets of resonance parameters describe the energy-dependent line shape of the cross sections well. In set I [set II], the $R\\left(3810\\right)$ state has mass ($3805.7\u00b11.1\u00b12.7$) $\\left[\\left(3805.7\u00b11.1\u00b12.7\\right)\\right]\\text{}\\text{}\\mathrm{MeV}/{c}^{2}$, total width ($11.6\u00b12.9\u00b11.9$) $\\left[\\left(11.5\u00b12.8\u00b11.9\\right)\\right]\\text{}\\text{}\\mathrm{MeV}$, and an electronic width multiplied by the nOCH decay branching fraction of ($10.9\u00b13.8\u00b12.5$) $\\left[\\left(11.0\u00b13.4\u00b12.5\\right)\\right]\\text{}\\text{}\\mathrm{eV}$. In addition, we measure the branching fractions $B\\left[R\\left(3760\\right)\\to \\mathrm{nOCH}\\right]=\\left(25.2\u00b116.1\u00b130.4\\right)%\\left[\\left(6.4\u00b14.8\u00b17.7\\right)%\\right]$ and $B\\left[R\\left(3780\\right)\\to \\mathrm{nOCH}\\right]=\\left(12.3\u00b16.6\u00b18.3\\right)%\\left[\\left(10.4\u00b14.8\u00b17.0\\right)%\\right]$ for the first time. The $R\\left(3760\\right)$ state can be interpreted as an open-charm (OC) molecular state, but containing a simple four-quark state component. The $R\\left(3810\\right)$ state can be interpreted as a hadrocharmonium state.</p>", 
  "author": [
    {
      "family": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "container_title": "Physical Review Letters", 
  "id": "275079", 
  "issue": "19", 
  "issued": {
    "date-parts": [
      [
        2024, 
        5, 
        9
      ]
    ]
  }, 
  "title": "First Observation of a Three-Resonance Structure in ${e}^{+}{e}^{-}\\to \\text{Nonopen}$ Charm Hadrons", 
  "type": "article-journal", 
  "volume": "132"
}