Multi - instanton effects in QCD sum rules for the pionстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Multi-instanton contributions to QCD sum rules for the pion are investigated within a framework which models the QCD vacuum as an instanton liquid. It is shown that, in a singular
gauge, the sum of the planar diagrams to leading order of the 1=Nc expansion provides results
similar to those for the effective single-instanton contribution. These effects are also analysed in the regular gauge. Our findings confirm that at large distances the correlator functions are more adequately described in the singular gauge rather than in the regular one.