Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2009-06-22
Physics
High Energy Physics
High Energy Physics - Lattice
Invited talk at the Workshop on the Physics of excited nucleons NSTAR2009, Beijing, April 19-22, 2009, 9 pages
Scientific paper
We present recent lattice results on the baryon spectrum, nucleon electromagnetic and axial form factors, nucleon to $\Delta$ transition form factors as well as the $\Delta$ electromagnetic form factors. The masses of the low lying baryons and the nucleon form factors are calculated using two degenerate flavors of twisted mass fermions down to pion mass of about 270 MeV. We compare to the results of other collaborations. The nucleon to $\Delta$ transition and $\Delta$ form factors are calculated in a hybrid scheme, which uses staggered sea quarks and domain wall valence quarks. The dominant dipole nucleon to $\Delta$ transition form factor is also evaluated using dynamical domain wall fermions. The transverse density distributions of the $\Delta$ in the infinite momentum frame are extracted using the form factors determined from lattice QCD.
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