We calculate pion vector and scalar form factors in two-flavor lattice QCD and study the chiral behavior of the vector and scalar radii <r^2>_{V,S}. For a direct comparison with chiral perturbation theory (ChPT), chiral symmetry is exactly preserved by employing the overlap quark action. We utilize the all-to-all quark propagator in order to calculate the scalar form factor including the contributions of disconnected diagrams. A detailed comparison with ChPT reveals that two-loop contributions are important to describe the chiral behavior of the radii in our region of the pion mass M_\pi \gtrsim 290 MeV. From chiral extrapolation based on two-loop ChPT, we obtain <r^2>_V = 0.409(23)(37) fm^2 and <r^2>_S = 0.617(79)(66) fm^2, which are consistent with phenomenological analyses.
@article{arxiv.0911.5193,
title = {Pion form factors from lattice QCD with exact chiral symmetry},
author = {Takashi Kaneko},
journal= {arXiv preprint arXiv:0911.5193},
year = {2014}
}
Comments
9 pages, talk presented at 6th International Workshop on Chiral Dynamics, University of Bern, Switzerland, July 6-10, 2009