arXiv:hep-lat/0311017·v2·High Energy Physics — Lattice
Structure functions and form factors close to the chiral limit from lattice QCD
T. Bakeyev · D. Galletly · M. Göckeler · M. Gürtler · R. Horsley · B. Joó · A. D. Kennedy · B. Pendleton · H. Perlt · D. Pleiter · P. E. L. Rakow · G. Schierholz
Abstract
Results for nucleon matrix elements (arising from moments of structure functions) and form factors from a mixture of runs using Wilson, clover and overlap fermions (both quenched and unquenched) are presented and compared in an effort to explore the size of the chiral `regime', lattice spacing errors and quenching artefacts. While no run covers this whole range of effects the partial results indicate a picture of small lattice spacing errors, small quenching effects and only reaching the chiral regime at rather light quark masses.
Comments: 7 pages, 7 figures; contribution to the 2003 Workshop on Lattice Hadron Physics, Cairns, Australia; error in Fig. 4 corrected; minor text changes