RESTORATION OF CHIRAL AND U(1)A SYMMETRIES IN EXCITED HADRONS IN THE SEMICLASSICAL REGIME

摘要

Restoration of chiral and U(1)A symmetries in excited hadrons is reviewed Implications of the OPE as well as of the semiclassical expansion for this phenomenon are discussed. A solvable model of the 't Hooft type in 3+1 dimensions is presented, which demonstrates a fast restoration of both chiral and U(1)A symmetries at larger spins and radial excitations.