Electromagnetic Contributions to Vector Meson Masses and Mixings
  We use the 1/N_c method to estimate electromagnetic contributions to vector meson masses and mixings. We identify several new sources of rho-omega mixing coming from short-distance effects. We comment on the extraction of quark masses from the vector meson masses. We also present a simple group theoretical discussion of the electromagnetic mass differences. 
J. Bijnens and P. Gosdzinsky