We report on our lattice calculations of the nucleon's generalized parton distributions (GPDs), concentrating on their first moments for the case of N_f=2. Due to recent progress on the numerical side we are able to present results for the generalized form factors at pion masses as low as 260 MeV. We perform a fit to one-loop covariant baryon chiral perturbation theory with encouraging results.
@article{arxiv.1203.6579,
title = {First moments of the nucleon generalized parton distributions from lattice QCD},
author = {A. Sternbeck and M. Göckeler and Ph. Hägler and R. Horsley and Y. Nakamura and A. Nobile and D. Pleiter and P. E. L. Rakow and A. Schäfer and G. Schierholz and J. Zanotti},
journal= {arXiv preprint arXiv:1203.6579},
year = {2012}
}
Comments
7 pages, 4 figures. Contribution to the XXIX International Symposium on Lattice Field Theory, July 10-16, 2011, Squaw Valley, Lake Tahoe, California