Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2003-03-18
Nucl.Phys.B664:276-298,2003
Physics
High Energy Physics
High Energy Physics - Lattice
28 pages, 10 figures
Scientific paper
10.1016/S0550-3213(03)00394-8
We discuss the usage of continuous external momenta for computing renormalization factors as needed to renormalize operator matrix elements. These kind of external momenta are encoded in special boundary conditions for the fermion fields. The method allows to compute certain renormalization factors on the lattice that would have been very difficult, if not impossible, to compute with standard methods. As a result we give the renormalization group invariant step scaling function for a twist-2 operator corresponding to the average momentum of non-singlet quark densities.
Guagnelli Marco
Jansen Karl
Palombi Filippo
Petronzio Roberto
Shindler Andrea
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