Аннотация:
Pion transition form factor for the process γ⋆γ⋆→π0 at space-like values of photon momenta is calculated within the effective quark-meson model with the interaction induced by instanton exchange. The leading and next-to-leading order power asymptotics of the form factor and the relation between the light-cone pion distribution amplitudes of twists 2 and 4 and the dynamically generated quark mass are found.
Поступила в редакцию: 18.12.2002 Исправленный вариант: 25.12.2002
Образец цитирования:
A. E. Dorokhov, “Pion distribution amplitudes within the instanton model of QCD vacuum”, Письма в ЖЭТФ, 77:2 (2003), 68–72; JETP Letters, 77:2 (2003), 63–67