Nucleon Form Factors: Probing the Chiral Limit

Abstract

The electromagnetic form factors provide important hints for the internal structure of the nucleon and continue to be of major interest for experimentalists. For an intermediate range of momentum transfers the form factors can be calculated on the lattice. However, reliability of the results is limited by systematic errors due to the required extrapolation to physical quark masses. Chiral effective field theories predict a rather strong quark mass dependence in a range which was yet unaccessible for lattice simulations. We give an update on recent results from the QCDSF collaboration using gauge configurations with Nf=2, non-perturbatively O(a)-improved Wilson fermions at very small quark masses down to 340 MeV pion mass, where we start to probe the relevant quark mass region.

7 pages, contribution to Lattice 2006

References in corpus (8)

• Proton elastic form factor ratios to $Q^2$ = 3.5 GeV${}^2$ by polarization transfer
• Generalized parton distributions from nucleon form factor data
• Perturbative QCD Analysis of the Nucleon's Pauli Form Factor F_2(Q^2)
• Effects of non-perturbatively improved dynamical fermions in QCD at fixed lattice spacing
• Nucleon electromagnetic form factors on the lattice and in chiral effective field theory
• Chiral Symmetry and the Intrinsic Structure of the Nucleon
• Nucleon form factors and O(a) Improvement
• Chiral Magnetism of the Nucleon