出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：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 243
48 lattice. The use of overlap quarks suppresses unwanted operator mixing
and lattice artifacts. Results for the leadingWilson coefficients are extracted by means of Singular
Value Decomposition.
