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

CSSM Collaborations, QCDSF UKQCD Collaborations, P. E. Shanahan*, R. Horsley, Y. Nakamura, D. Pleiter, P. E. L. Rakow, G. Schierholz, H. Stueben, A. W. Thomas, R. D. Young, J. M. Zanotti

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number074511
Number of pages20
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume89
Issue number7
DOIs
Publication statusPublished - 18 Apr 2014

Keywords

  • PERTURBATION-THEORY
  • QUARK MASS
  • NUCLEON
  • MOMENTS
  • RATIO

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