Baryon structure from Lattice QCD

Abstract

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.

Invited talk at the Workshop on the Physics of excited nucleons NSTAR2009, Beijing, April 19-22, 2009, 9 pages

References in corpus (17)

• Ab-initio Determination of Light Hadron Masses
• 2+1 Flavor Lattice QCD toward the Physical Point
• Physical Results from 2+1 Flavor Domain Wall QCD and SU(2) Chiral Perturbation Theory
• Nucleon Generalized Parton Distributions from Full Lattice QCD
• Light hadron spectroscopy using domain wall valence quarks on an Asqtad sea
• Twisted mass lattice QCD
• Nucleon axial charge in 2+1 flavor dynamical lattice QCD with domain wall fermions
• Light baryon masses with dynamical twisted mass fermions
• The nucleon electromagnetic form factors from Lattice QCD
• Lattice QCD determination of patterns of excited baryon states
• The nucleon to Delta electromagnetic transition form factors in lattice QCD
• Two-flavor QCD simulation with exact chiral symmetry
• Axial Nucleon and Nucleon to Delta form fractors and the Goldberger-Treiman Relations from Lattice QCD
• Delta-baryon electromagnetic form factors in lattice QCD
• Quark transverse charge densities in the $\Delta (1232)$ from lattice QCD
• Derivative sources in lattice spectroscopy of excited light-quark mesons
• Even parity excitations of the nucleon in lattice QCD

Cited by in corpus (5)

• Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass
• Nucleon to Delta transition form factors with $N_F=2+1$ domain wall fermions
• Singularity structure of the pi N scattering amplitude in a meson-exchange model up to energies W < 2.0 GeV
• Configuration Mixing of Quark States in Baryons
• Nucleon form factors with Nf=2 dynamical twisted mass fermions