4 Eylül 2024 Dergi makalesi Açık Erişim

CERN İşbirliği

Citation Style Language JSON

{
  "DOI": "10.1103/PhysRevLett.133.101902", 
  "abstract": "<p>The $J/\\psi $, $\\psi \\left(3686\\right)\\to {\\Sigma }^{0}{\\overline{\\Sigma }}^{0}$ processes and subsequent decays are studied using the world's largest $J/\\psi $ and $\\psi \\left(3686\\right)$ data samples collected with the BESIII detector. The parity-violating decay parameters of the decays ${\\Sigma }^{0}\\to \\Lambda \\gamma $ and ${\\overline{\\Sigma }}^{0}\\to \\overline{\\Lambda }\\gamma $, ${\\alpha }_{{\\Sigma }^{0}}=-0.0017\u00b10.0021\u00b10.0018$ and ${\\overline{\\alpha }}_{{\\Sigma }^{0}}=0.0021\u00b10.0020\u00b10.0022$, are measured for the first time. The strong $CP$ symmetry is tested in the decays of the ${\\Sigma }^{0}$ hyperons for the first time by measuring the asymmetry ${A}_{CP}^{\\Sigma }={\\alpha }_{{\\Sigma }^{0}}+{\\overline{\\alpha }}_{{\\Sigma }^{0}}=\\left(0.4\u00b12.9\u00b11.3\\right)\u00d7{10}^{-3}$. The weak $CP$ test is performed in the subsequent decays of their daughter particles $\\Lambda $ and $\\overline{\\Lambda }$. Also for the first time, the transverse polarizations of the ${\\Sigma }^{0}$ hyperons in $J/\\psi $ and $\\psi \\left(3686\\right)$ decays are observed with opposite directions, and the ratios between the $S$-wave and $D$-wave contributions of the $J/\\psi $, $\\psi \\left(3686\\right)\\to {\\Sigma }^{0}{\\overline{\\Sigma }}^{0}$ decays are obtained. These results are crucial to understand the decay dynamics of the charmonium states and the production mechanism of the ${\\Sigma }^{0}-{\\overline{\\Sigma }}^{0}$ pairs.</p>", 
  "author": [
    {
      "family": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "container_title": "Physical Review Letters", 
  "id": "274727", 
  "issue": "10", 
  "issued": {
    "date-parts": [
      [
        2024, 
        9, 
        4
      ]
    ]
  }, 
  "title": "Strong and Weak $CP$ Tests in Sequential Decays of Polarized ${\\Sigma }^{0}$ Hyperons", 
  "type": "article-journal", 
  "volume": "133"
}