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

A.W. Thomas; D. Pleiter; G. Schierholz; H. St\"uben; J.M. Zanotti; P.E.L. Rakow; P.E. Shanahan; R.D. Young; R. Horsley; Y. Nakamura

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

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arxiv 1401.5862 v3 pith:KTYEL3CU submitted 2014-01-23 hep-lat hep-phnucl-th

P.E. Shanahan , R. Horsley , Y. Nakamura , D. Pleiter , P.E.L. Rakow , G. Schierholz , H. Stüben , A.W. Thomas

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R.D. Young J.M. Zanotti

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classification hep-lathep-phnucl-th

keywords formbaryonsfactorsmagneticoctetchirallatticetheory

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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.

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