Instanton contribution to the pion and proton formfactors at Q^2 greater than 1 GeV^2

Abstract

Studying the instanton-induced contributions to various hard exclusive reactions provides physical insight into the transition from the non-perturbative to the perturbative regime of QCD. To this end, we study the leading-instanton contribution to the electro-magnetic and transition formfactors, using an effective theory of the Instanton Liquid Model. We report predictions for the space-like electro-magnetic formfactor of the pion, as well as recent results for the Dirac formfactor of the proton.

Comments: Talk given at 2nd NAPP Conference, Dubrovnik May 2003. Discussion improved. Results unchanged