Vector and axial-vector current correlators within the instanton model of QCD vacuum

Abstract

The pion electric polarizability, \alpha^E_\pi^\pm, the leading order hadronic contribution to the muon anomalous magnetic moment, $a_\mu^{hvp 1}$, and the ratio of the difference to the sum of vector and axial-vector correlators, (V-A)/(V+A), are found within the instanton model of QCD vacuum. The results are compared with phenomenological estimates of these quantities following from the ALEPH and OPAL data on vector and axial-vector spectral densities.Comment: 5 pages, 1 figure, talk given at the 16th Intern. Spin Physics Symposium, SPIN2004, Trieste, Italy (October 10-16, 2004