Observing Chiral Nonanalytic Behavior with FLIC Fermions

نویسندگان

  • D. B. Leinweber
  • A. W. Thomas
  • A. G. Williams
  • R. D. Young
  • J. M. Zanotti
  • J. B. Zhang
چکیده

First results from lattice QCD revealing the chiral nonanalytic behavior of nucleon and ∆ baryon magnetic moments are presented. Numerical simulations in the light quark mass regime employing the nonperturbatively O(a)-improved conserved vector current are enabled via FLIC fermions. Quenched chiral perturbation theory for the nucleon and ∆ magnetic moments is derived to next to next to leading nonanalytic order. Numerical simulation results for the proton and ∆ baryon magnetic moments in quenched QCD reveal dramatic signatures of the quenched meson cloud, which are in accord with the predictions of quenched chiral perturbation theory.

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تاریخ انتشار 2003