Higher-twist contributions to FL and F2 from instantons
Abstract
We study the twist-4 contribution to the unpolarized nucleon structure functions, FL and F2, in an approach where the vacuum structure of QCD is described by a dilute medium of instantons ( / R 1). The dominant power corrections come from the twist-4 quark-gluon operators and are of the order 1/(2 Q2). The contributions from four-quark operators are suppressed. The approach predicts large 1/Q2-corrections to FL, in agreement with the results of QCD fits to the data.
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