1 Ocak 2021 Dergi makalesi Açık Erişim

CERN İşbirliği

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    "description": "<p>The Born cross sections of the ${e}^{+}{e}^{-}\\to {\\Sigma }^{+}{\\overline{\\Sigma }}^{-}$ and ${e}^{+}{e}^{-}\\to {\\Sigma }^{-}{\\overline{\\Sigma }}^{+}$ processes are determined for center-of-mass energy from 2.3864 to 3.0200 GeV with the BESIII detector. The cross section lineshapes can be described properly by a pQCD function and the resulting ratio of effective form factors for the ${\\Sigma }^{+}$ and ${\\Sigma }^{-}$ is consistent with 3. In addition, ratios of the ${\\Sigma }^{+}$ electric and magnetic form factors, $|{G}_{E}/{G}_{M}|$, are obtained at three center-of-mass energies through an analysis of the angular distributions. These measurements, which are studied for the first time in the off-resonance region, provide precision experimental input for understanding baryonic structure. The observed new features of the ${\\Sigma }^{\u00b1}$ form factors require more theoretical discussions for the hyperons.</p>", 
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      "title": "Physics Letters B", 
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    "title": "Measurements of \u03a3 And \u03c3 time-like electromagnetic form factors for center-of-mass energies from 2.3864 to 3.0200 GeV"
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