1 Ocak 2023 Dergi makalesi Açık Erişim

CERN İşbirliği

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  "doi": "10.1103/PhysRevD.108.L111101", 
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    "description": "<p>Using data samples collected at center-of-mass energies between 2.000 and 3.080 GeV with the BESIII detector operating at the BEPCII collider, a partial-wave analysis is performed on the process ${e}^{+}{e}^{-}\\to \\eta {\\pi }^{+}{\\pi }^{-}$. In addition to the dominant ${e}^{+}{e}^{-}\\to \\rho \\eta $ component, the ${e}^{+}{e}^{-}\\to {a}_{2}\\left(1320\\right)\\pi $ process is also sizable, contributing up to 24% of the total reaction. The measured cross sections of the process ${e}^{+}{e}^{-}\\to \\eta {\\pi }^{+}{\\pi }^{-}$ are systematically higher than those of BABAR by more than $3\\sigma $ at center-of-mass energies between 2.000 and 2.300 GeV. In the cross section line shape for ${e}^{+}{e}^{-}\\to {a}_{2}\\left(1320\\right)\\pi $, a resonant structure is observed with a significance of $5.5\\sigma $, with $M=\\left(2044\u00b131\u00b14\\right)\\text{}\\text{}\\mathrm{MeV}/{c}^{2}$, $\\Gamma =\\left(163\u00b169\u00b124\\right)\\text{}\\text{}\\mathrm{MeV}$, and ${B}_{R}\u00b7{\\Gamma }_{{e}^{+}{e}^{-}}^{R}=\\left(34.6\u00b117.1\u00b16.0\\right)\\text{}\\text{}\\mathrm{eV}$ or $\\left(137.1\u00b173.3\u00b12.1\\right)\\text{}\\text{}\\mathrm{eV}$. In the cross section line shape for ${e}^{+}{e}^{-}\\to \\rho \\eta $, an evidence of a dip structure around $2180\\text{}\\text{}\\mathrm{MeV}/{c}^{2}$ is observed with statistical significance of $3.0\\sigma $.</p>", 
    "doi": "10.1103/PhysRevD.108.L111101", 
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    "journal": {
      "issue": "11", 
      "title": "Physical Review D", 
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    "publication_date": "2023-01-01", 
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    "title": "Measurement of the cross sections for ${e}^{+}{e}^{-}\\to \\eta {\\pi }^{+}{\\pi }^{-}$ at center-of-mass energies between 2.00 and 3.08 GeV"
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