arXiv:0810.2590·v2·High Energy Physics — Lattice
Pion vector and scalar form factors with dynamical overlap quarks
JLQCD · TWQCD collaborations: T.Kaneko · S.Aoki · T.W.Chiu · H.Fukaya · S.Hashimoto · T.H.Hsieh · H.Matsufuru · J.Noaki · T.Onogi · E.Shintani · N.Yamada
Abstract
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.
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