Effective restoration of chiral symmetry in excited mesons

Authors :: L. Ya. Glozman
R. F. Wagenbrunn
Publication Year :: 2006
Publisher :: arXiv, 2006.
Abstract: A fast restoration of chiral symmetry in excited mesons is demonstrated. A minimal "realistic" chirally symmetric confining model is used, where the only interaction between quarks is the linear instantaneous Lorentz-vector confining potential. Chiral symmetry breaking is generated via the nonperturbative resummation of valence quarks self-energy loops and the meson bound states are obtained from the Bethe-Salpeter equation. The excited mesons fall into approximate chiral multiplets and lie on the approximately linear radial and angular Regge trajectories, though a significant deviation from the linearity of the angular trajectory is observed.<br />Comment: 12 pp. One more clarifying paragraph has been added. To appear in Phys. Lett. B