Status of lattice structure function calculations

Abstract

The moments of structure functions can be calculated from first principles, without making any model assumptions, using the non-perturbative techniques of lattice QCD. Numerous results have been obtained from lattice computations in the last years. They include the calculation of the lowest moments of the unpolarized structure functions, of the spin-dependent g_1 and g_2 structure functions and of the h_1 transversity structure function. Some higher-twist matrix elements have been studied as well. The novelties of the last couple of years are the first computations of structure functions done in full QCD (unquenched), and new proposals for the extrapolations to the chiral limit using chiral perturbation theory. A lot of work however still needs to be done in order to control other systematic uncertainties like the continuum limit or the non-perturbative renormalization. (orig.)Available from TIB Hannover: RA 2999(02-067) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman