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hep-ph2000
Twist-4 quark-quark correlations in the pion from the instanton vacuum
Nam-Young Lee, K. Goeke, C. Weiss
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 Paper withdrawn pending resolution of this problem.
hep-ph2000
Higher-twist contributions to F_L and F_2 from instantons
B. Dressler, M. Maul, C. Weiss
We study the twist-4 contribution to the unpolarized nucleon structure functions, F_L and F_2, in an approach where the vacuum structure of QCD is described by a dilute medium of i…