Ξ*0−Ξ*−Mass Difference

Abstract

The ${\ensuremath{\Xi}}^{*0}\ensuremath{-}{\ensuremath{\Xi}}^{*\ensuremath{-}}$ electromagnetic mass difference is calculated using a method suggested by Dashen and Frautschi. It is assumed that ${\ensuremath{\Xi}}^{*}$ is a bound state of $\overline{K}$ and $\ensuremath{\Lambda}$. The contributions to the mass difference arising from kinematics, photon exchange, mass difference of the crossed nucleon, and the vertex corrections to the $\ensuremath{\Lambda}\mathrm{NK}$ coupling constant are included. The calculated mass difference is in agreement with the experimental value of Pjerrou et al.