Pion-distribution amplitude within the instanton model
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2001-07-01
Autores
Anikin, I. V.
Dorokhov, A. E.
Tomio, L. [UNESP]
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The leading-twist pion-distribution amplitude is obtained at a low normalization scale of order ρc (inverse average size of an instanton). Pion dynamics, consistent with gauge invariance and low-energy theorems, is considered within the instanton vacuum model. The results are QCD-evolved to higher momentum-transfer values and are in agreement with recent data from CLEO on the pion transition form factor. It is also shown that some previous calculations violate the axial Ward-Takahashi identity. © 2001 MAIK Nauka/Interperiodica.
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Physics of Atomic Nuclei, v. 64, n. 7, p. 1329-1336, 2001.