Nucleon structure in terms of OPE with non-perturbative Wilson coefficients

Details Nucleon structure in terms of OPE with non-perturbative Wilson coefficients Nucleon structure in terms of OPE with non-perturbative Wilson coefficients

2008-08-27

arxiv.org/abs/0808.3637v1

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 3 figures, contribution to the XXVI International Symposium on Lattice Field Theory, July 14-19 Williamsburg, Virgini

Scientific paper

Lattice calculations could boost our understanding of Deep Inelastic Scattering by evaluating moments of the Nucleon Structure Functions. To this end we study the product of electromagnetic currents between quark states. The Operator Product Expansion (OPE) decomposes it into matrix elements of local operators (depending on the quark momenta) and Wilson coefficients (as functions of the larger photon momenta). For consistency with the matrix elements, we evaluate a set of Wilson coefficients non-perturbatively, based on propagators for numerous momentum sources, on a 24^3 x 48 lattice. The use of overlap quarks suppresses unwanted operator mixing and lattice artifacts. Results for the leading Wilson coefficients are extracted by means of Singular Value Decomposition.

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