Structure functions and form factors close to the chiral limit from lattice QCD

Bakeyev, T.; Galletly, D.; Göckeler, M.; Gürtler, M.; Horsley, R.; Joó, B.; Kennedy, A. D.; Pendleton, B.; Perlt, H.; Pleiter, D.; Rakow, P. E. L.; Schierholz, G.; Schiller, A.; Streuer, T.; Stüben, H.

Structure functions and form factors close to the chiral limit from lattice QCD

Authors

Description

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.
7 pages, 7 figures; contribution to the 2003 Workshop on Lattice Hadron Physics, Cairns, Australia; error in Fig. 4 corrected; minor text changes