Twist-4 quark-quark correlations in the pion from the instanton vacuum

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 Paper withdrawn pending resolution of this problem.

Comments: 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 Paper withdrawn pending resolution of this problem