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, A. Schiller, T. Streuer, H. Stüben
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.
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