Nucleon Form Factors: Probing the Chiral Limit

Details Nucleon Form Factors: Probing the Chiral Limit Nucleon Form Factors: Probing the Chiral Limit

2006-10-25

arxiv.org/abs/hep-lat/0610118v1

PoSLAT2006:120,2006

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, contribution to Lattice 2006

Scientific paper

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.

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