Axial-vector currents and tau mesonic decays

Abstract

A general expression of the axial-vector current is presented, in which both the effects of the chiral symmetry breaking and the spontaneous chiral symmetry breaking are included. A new resonance formula of the axial-vector meson is derived and in the limit of $q^2\to 0$ this formula doesn't go back to the ``chiral limit``. The studies show that the dominance of the axial-vector meson is associated with the satisfaction of PCAC. The dominance of pion exchange is companied by the strong anomaly of PCAC.

Comments: 8 pages, talk presented at the Fourth International Workshop on tau Lepton Physivs, Este Park, Colorado, Sept. 15-19, 1996