Electromagnetic Decay of the $Σ^{0}(1385)$ to $Λγ$

Abstract

The electromagnetic decay $Σ^0(1385) \to Λγ$ 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 $K^+Σ^{*0}$. We report the decay widths ratio $Σ^0(1385) \to Λγ$/ $Σ^0(1385) \to Λπ^0$ = $1.42 \pm 0.12(\text{stat})_{-0.07}^{+0.11}(\text{sys})$%. 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 $Σ^0(1385) \to Λγ$.