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

Abstract

We present a 2+1--flavor lattice QCD calculation of the electromagnetic Dirac and Pauli form factors of the octet baryons. The magnetic Sachs form factor is extrapolated at six fixed values of $Q^2$ to the physical pseudoscalar masses and infinite volume using a formulation based on heavy baryon chiral perturbation theory with finite-range regularization. We properly account for omitted disconnected quark contractions using a partially-quenched effective field theory formalism. The results compare well with the experimental form factors of the nucleon and the magnetic moments of the octet baryons.

Typo corrected in Table VI

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• High-precision determination of the electric and magnetic form factors of the proton
• Nucleon electromagnetic form factors
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• Disconnected quark loop contributions to nucleon observables in lattice QCD
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