Recent results on the nucleon structure functions from lattice QCD

We report on recent results of a high statistics lattice calculation of the unpolarized and polarized structure functions of the nucleon. (orig.)9 refs.Available from TIB Hannover: RA 2999(95-203) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

A lattice evaluation of the deep-inelastic structure functions of the nucleon

The lower moments of the unpolarized and polarized deep-inelastic structure functions of the nucleon are calculated on the lattice. The calculation is done with Wilson fermions and for three values of the hopping parameter #kappa#, so that we can perform the extrapolation of the chiral limit. Particular emphasis is put on the renormalization of lattice operators. The renormalization constants, which lead us from lattice to continuum operators, are computed perturbatively to one loop order as well as non-perturbatively. (orig.)14 refs.SIGLEAvailable from TIB Hannover: RA 2999(95-178) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

The status of lattice calculations of the nucleon structure functions

We review our progress on the lattice calculation of low moments of both the unpolarised and polarised nucleon structure functions. (orig.)Talk presented by R. Horsley at the 29th symposium on the theory of elementary particles, Buckow (DE), 14 refs.Available from TIB Hannover: RA 2999(96-003) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

First results with non-perturbative fermion improvement

We present initial results for light hadron masses and nucelon structure functions using a recent proposal for eliminating all O(#alpha#) effects from Wilson fermion simulations in the quenched approximation. With initially limited statistics, we find a much more linear APE plot and a value of the axial coupling g_A nearer to the experimental point than with comparable runs using unimproved Wilson fermions. (orig.)8 refs.Available from TIB Hannover: RA 2999(96-142) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Non-perturbative versus perturbative renormalization of lattice operators

Our objective is to compute the moments of the deep-inelastic structure functions of the nucleon on the lattice. A major source of uncertainty is the renormalization of the lattice operators that enter the calculation. In this talk we compare the renormalization constants of the most relevant twist-two bilinear quark operators which we have computed non-perturbatively and perturbatively to one loop order. Furthermore, we discuss the use of tadpole improved perturbation theory. (orig.)6 refs.SIGLEAvailable from TIB Hannover: RA 2999(95-179) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

The Drell-Yan process and deep inelastic scattering from the lattice

We report on measurements of the h_1 structure function, relevant to calculating cross-sections for the Drell-Yan process. This is a quantity can not be measured in deep inelastic scattering, it gives additional information on the spin carried by the valence quarks, as well as insights on how relativistic the quarks are. (orig.)8 refs.Available from TIB Hannover: RA 2999(96-152) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

A preliminary lattice study of the glue in the nucleon

About half the mass of a hadron is given from gluonic contributions. In this talk we calculate the chromo-electric and chromo-magnetic components of the nucleon mass. These computations are numerically difficult due to gluon field ultra-violet fluctuations. Nevertheless a high statistics feasibility run using quenched Wilson fermions seems to show reasonable signals. (orig.)SIGLEAvailable from TIB Hannover: RA 2999(96-127) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman