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arxiv: hep-ph/0309179 · v2 · submitted 2003-09-16 · ✦ hep-ph

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Instanton contribution to the pion and proton formfactors at Q² greater than 1 GeV²

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classification ✦ hep-ph
keywords contributionelectro-magneticformfactorformfactorsinstantonpionprotontransition
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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.

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