Electromagnetic decay of theΣ0(1385)toΛγ
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Abstract
The electromagnetic decay ${\ensuremath{\Sigma}}^{0}(1385)\ensuremath{\rightarrow}\ensuremath{\Lambda}\ensuremath{\gamma}$ was studied using the CLAS detector at the Thomas Jefferson National Accelerator Facility. A real photon beam with a maximum energy of 3.8 GeV was incident on a proton target, producing an exclusive final state of ${K}^{+}{\ensuremath{\Sigma}}^{*0}$. We report the decay widths ratio ${\ensuremath{\Sigma}}^{0}(1385)\ensuremath{\rightarrow}\ensuremath{\Lambda}\ensuremath{\gamma}/{\ensuremath{\Sigma}}^{0}(1385)\ensuremath{\rightarrow}\ensuremath{\Lambda}{\ensuremath{\pi}}^{0}=1.42\ifmmode\pm\else\textpm\fi{}0.12(\mathrm{stat}{)}_{\ensuremath{-}0.07}^{+0.11}(\mathrm{sys})%$. This ratio is larger than most theoretical predictions by factors ranging from 1.5--3, but is consistent with the only other experimental measurement. From the reported ratio we calculate the partial width and electromagnetic transition magnetic moment for ${\ensuremath{\Sigma}}^{0}(1385)\ensuremath{\rightarrow}\ensuremath{\Lambda}\ensuremath{\gamma}$.
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