Isospin Symmetry Breaking and the $\rho -\omega$-System

Abstract

Simple quark models for the low lying vector mesons suggest a mixing between the u- and d-flavors and a violation of the isospin symmetry for the $\rho -\omega$- system much stronger than observed. It is shown that the chiral dynamics, especially the QCD anomaly, is responsible for a restoration of the isospin symmetry in the $\rho -\omega$-system.

4 pages, espcrc2.sty

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