We calculate the pion vector and scalar form factors in two-flavor QCD. Gauge configurations are generated with dynamical overlap quarks on a 16^3 x 32 lattice at a lattice spacing of 0.12 fm with sea quark masses down to a sixth of the physical strange quark mass. Contributions of disconnected diagrams to the scalar form factor is calculated employing the all-to-all quark propagators. We present a detailed comparison of the vector and scalar radii with chiral perturbation theory to two loops.
@article{arxiv.0810.2590,
title = {Pion vector and scalar form factors with dynamical overlap quarks},
author = {JLQCD and TWQCD collaborations and : and T. Kaneko and S. Aoki and T. W. Chiu and H. Fukaya and S. Hashimoto and T. H. Hsieh and H. Matsufuru and J. Noaki and T. Onogi and E. Shintani and N. Yamada},
journal= {arXiv preprint arXiv:0810.2590},
year = {2012}
}
Comments
7 pages; Talk presented at the XXVI International Symposium on Lattice Field Theory, July 14 - 19 2008, Williamsburg, Virginia, USA; v2: a reference added