Electromagnetic hadron mass differences and estimation of isotopic symmetry violation parameters of QCD vacuum from quark model

Abstract

The estimations of the light quark mass differences, m d − m u , and the light quark condensate differences, 〈 DD〉 − 〈 UU〉 , are obtained in the framework of the quark model with QCD vacuum induced quark interaction. We consider long-wave condensate and short-wave instanton contributions to the electromagnetic hadron mass differences and show that the latter significantly improve the results on the baryon octet. The results are: m d − m u ≈ 3.5 MeV and 〈 DD〉 − 〈 UU〉 ≈ −(0 ∼ 3) × 10 −3〈 UU〉 .