Pion-distribution amplitude within the instanton model |
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Authors: | I V Anikin A E Dorokhov L Tomio |
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Institution: | 2. Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980, Russia 1. Instituto de Física Teórica, Univ. Estadial Paulista (UNESP), Rua Pamplona 145, BR-01405-900, S?o Paulo, SP, Brazil
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Abstract: | The leading-twist pion-distribution amplitude is obtained at a low normalization scale of order ρ c (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. |
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