Electric form factors of the octet baryons from lattice QCD and chiral extrapolation

Abstract

We apply a formalism inspired by heavy baryon chiral perturbation theory with finite-range regularization to dynamical $2+1-$flavor CSSM/QCDSF/UKQCD Collaboration lattice QCD simulation results for the electric form factors of the octet baryons. The electric form factor of each octet baryon is extrapolated to the physical pseudoscalar masses, after finite-volume corrections have been applied, at six fixed values of $Q^2$ in the range 0.2-1.3 GeV${}^2$. The extrapolated lattice results accurately reproduce the experimental form factors of the nucleon at the physical point, indicating that omitted disconnected quark loop contributions are small. Furthermore, using the results of a recent lattice study of the magnetic form factors, we determine the ratio ${\mu }_p{G}_E^p/G_M^p$. This quantity decreases with $Q^2$ in a way qualitatively consistent with recent experimental results.

Typo corrected in TABLE VII arXiv admin note: text overlap with arXiv:1401.5862

References in corpus (10)

• High-precision determination of the electric and magnetic form factors of the proton
• Nucleon electromagnetic form factors
• The nucleon electromagnetic form factors from Lattice QCD
• Disconnected quark loop contributions to nucleon observables in lattice QCD
• Nucleon structure with two flavors of dynamical domain-wall fermions
• Magnetic form factors of the octet baryons from lattice QCD and chiral extrapolation
• Chiral extrapolation of nucleon magnetic form factors
• Chiral extrapolation of octet-baryon charge radii
• Nucleon form factors from quenched lattice QCD with domain wall fermions
• Connected Parts of Decuplet Electromagnetic Properties

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