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- W172334056 abstract "In this paper we present the result of a direct QCD sum rule calculation of the transition form factor gammagamma* -> pi^o in the region of moderately large invariant momentum Q^2 > 1GeV^2 of the virtual photon. In contrast to pQCD, we make no assumptions about the shape of the pion distribution amplitude phi_pi(x). Our results agree with the Brodsky-Lepage proposal that the Q^2-dependence of this form factor is given by an interpolation between its Q^2=0 value fixed by the axial anomaly and 1/Q^2 pQCD behaviour for large Q^2, with normalization corresponding to the asymptotic form phi_pi^as (x)=6 f_pi x (1-x) of the pion distribution amplitude. Our prediction for the from factor $F_{gamma^*gamma^*pi^circ}(q_1^2 = 0,q_2^2 = -Q^2)$ is in good agreement with new CLEO data." @default.
- W172334056 created "2016-06-24" @default.
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- W172334056 date "1997-06-26" @default.
- W172334056 modified "2023-10-03" @default.
- W172334056 title "The asymptotics of the transition form factor gammagamma* -> pi^o and QCD sum rules" @default.
- W172334056 hasPublicationYear "1997" @default.
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