Isospin Symmetry Breaking in Hadrons and Nuclei

Abstract

A brief review of the isospin symmetry breaking in hadrons and nuclei is given with emphasis on the $u-d$ quark mass difference. The off-shell ${\rho }^0-\omega$ mixing is studied as a typical example of the symmetry breaking, and its relevance to the nuclear force and nuclei is discussed.

Comments: xxx pages, Latex, UTHEP-273