Twist-4 quark-quark correlations in the pion from the instanton vacuum
arXiv:hep-ph/0007103
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 Paper withdrawn pending resolution of this problem.
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 Paper withdrawn pending resolution of this problem