Pion and photon light-cone wave functions from the instanton vacuum
V. PetrovPetersburg Nuclear Physics Institute, Gatchina, 188350 St. Petersburg, Russian FederationMaxim V. PolyakovPetersburg Nuclear Physics Institute, Gatchina, 188350 St. Petersburg, Russian FederationRusko RuskovPetersburg Nuclear Physics Institute, Gatchina, 188350 St. Petersburg, Russian FederationC. WeissPetersburg Nuclear Physics Institute, Gatchina, 188350 St. Petersburg, Russian FederationK. GoekePetersburg Nuclear Physics Institute, Gatchina, 188350 St. Petersburg, Russian Federation
1999en
ABI
Аннотация
The leading-twist wave functions of the pion and the photon at a low normalization point are calculated in the effective low-energy theory derived from the instanton vacuum. The pion wave function is found to be close to the asymptotic one, consistent with the recent CLEO measurements. The photon wave function is nonzero at the end points. This different behavior is a consequence of the momentum dependence of the dynamical quark mass suggested by the instanton vacuum. We comment on the relation of meson wave functions and off-forward parton distributions in this model.
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