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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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  1. Patterns of flavour symmetry breaking in hadron matrix elements involving u, d and s quarks

    hep-lat 2019-09 conditional novelty 6.0 of 10

    Octet baryon matrix elements of octet currents obey a constrained SU(3) flavour-breaking expansion along the constant-singlet-mass trajectory, with one constraint at second order and no further constraints at third or...

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