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- W1640285967 abstract "Abstract The behavior of the transition pion form factor for processes γ ∗ γ→π 0 and γ ∗ γ ∗ →π 0 at large values of space-like photon momenta is estimated within the nonlocal covariant quark-pion model. It is shown that, in general, the coefficient of the leading asymptotic term depends dynamically on the ratio of the constituent quark mass and the average virtuality of quarks in the vacuum and kinematically on the ratio of photon virtualities. The kinematic dependence of the transition form factor allows us to obtain the relation between the pion light-cone distribution amplitude and the quark-pion vertex function. The dynamic dependence indicates that the transition form factor γ ∗ γ→π 0 at high momentum transfers is very sensitive to the nonlocality size of nonperturbative fluctuations in the QCD vacuum." @default.
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- W1640285967 date "2000-03-02" @default.
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- W1640285967 title "On high Q**2 behavior of the pion form-factor for transitions gamma* gamma ---> pi0 and gamma* gamma* ---> pi0 within the nonperturbative approach" @default.
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