Twist-4 quark-quark correlations in the pion from the instanton vacuum
classification
✦ hep-ph
keywords
appearsartifactcorrelationselementimproperinstantonmatrixpending
read the original abstract
The result for the matrix element A(I=2) = -0.14 F_pi^2 appears to be an artifact of an improper ultraviolet regularization. Paper withdrawn pending resolution of this problem.
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