Nucleon Electromagnetic Form Factors in Lattice QCD and Chiral Perturbation Theory
Sergey Syritsyn
MIT
I will present a recent high-statistics calculation of nucleon
electromagnetic form factors using lattice QCD with 2+1 flavors of dynamical
domain wall quarks. This is the first calculation with (almost) chirally
symmetric both sea and valence quark actions at pion masses down to
m_pi=300MeV and at lattice spacing as small as a=0.084fm. Using specially
tuned techniques to suppress gauge noise and excited state contaminations,
we determine the nucleon form factors with a remarkable precision. I will
also present the exrapolation of our results using two-flavor chiral
perturbation theory and comparison to experiment