Electromagnetic Decay of the ${\Sigma }^0(1385)$ to $\Lambda \gamma$

Abstract

The electromagnetic decay ${\Sigma }^0(1385)\to \Lambda \gamma$ 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 $K^{+}{\Sigma }^{\ast 0}$. We report the decay widths ratio ${\Sigma }^0(1385)\to \Lambda \gamma$/ ${\Sigma }^0(1385)\to \Lambda {\pi }^0$ = $1.42\pm 0.12(\text{stat}{)}_{-0.07}^{+0.11}(\text{sys})$%. 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 ${\Sigma }^0(1385)\to \Lambda \gamma$.

References in corpus (2)

• The Deuteron Spin-dependent Structure Function g1d and its First Moment
• Extraction and Interpretation of gamma N --> Delta Form Factors within a Dynamical Model