Hyperon electromagnetic properties in two-flavor chiral perturbation theory

Fu Jiun Jiang, Brian C. Tiburzi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The pion-mass dependence of hyperon electromagnetic properties is determined using two-flavor heavy baryon chiral perturbation theory. Specifically we compute chiral corrections to the charge radii, magnetic moments, and magnetic radii of the spin one-half hyperons, as well as the charge radii, magnetic moments, magnetic radii, electric quadrupole moments, and quadrupole radii of the spin three-half hyperons. Results for the nucleon and delta are also included. Efficacy of the two-flavor theory is investigated by analyzing the role played by virtual kaons. For the electromagnetic properties of spin one-half hyperons, kaon loop contributions are shown to be well described by terms analytic in the pion mass squared. Similarly kaon contributions to the magnetic moments of spin three-half hyperons are well described in the two-flavor theory. The remaining electromagnetic properties of spin three-half resonances can be described in two-flavor chiral perturbation theory, however, this description fails just beyond the physical pion mass. For the case of experimentally known hyperon magnetic moments and charge radii, we demonstrate that chiral corrections are under reasonable control, in contrast to the behavior of these observables in the three-flavor chiral expansion. The formulas we derive are ideal for performing the pion-mass extrapolation of lattice QCD data obtained at the physical strange quark mass.

Original languageEnglish
Article number034017
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume81
Issue number3
DOIs
Publication statusPublished - 2010 Feb 11

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electromagnetic properties
hyperons
perturbation theory
radii
pions
magnetic moments
quadrupoles
kaons
extrapolation
baryons
quantum chromodynamics
quarks
moments
expansion

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Hyperon electromagnetic properties in two-flavor chiral perturbation theory. / Jiang, Fu Jiun; Tiburzi, Brian C.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 81, No. 3, 034017, 11.02.2010.

Research output: Contribution to journalArticle

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