Meson twist-4 parton distributions in terms of twist-2 distribution amplitudes at large Nc
Abstract
We show that in the large Nc limit four-quark twist-4 distributions in the pion can be expressed in terms of twist-2 pion distribution amplitude. This allows us to compute the isospin-2 structure function of the pion F2I=2(xB) in the large Nc limit. The method can be easily applied to other mesons as well.
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