The nucleon scalar density approaches the vacuum quark condensate at infinity, which the author argues produces a delta-function singularity at x=0 in the chiral-odd twist-3 PDF e(x).
W.; Chanfray, G., The pion-nucle on sigma term, J
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Extraordinary nature of the nucleon scalar charge and its densities as a signal of nontrivial vacuum structure of QCD
The nucleon scalar density approaches the vacuum quark condensate at infinity, which the author argues produces a delta-function singularity at x=0 in the chiral-odd twist-3 PDF e(x).