Pion distribution amplitude within the instanton modelстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Abstract—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.T he 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.