Chiral corrections to the axial charges of the octet baryons from quenched QCD

Physics – High Energy Physics – High Energy Physics - Lattice

Scientific paper

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standard LaTeX, 16 pages, 4 epsf figures

Scientific paper

10.1103/PhysRevD.58.074509

We calculate one-loop correction to the axial charges of the octet baryons using quenched chiral perturbation theory, in order to understand chiral behavior of the axial charges in quenched approximation to quantum chromodynamics (QCD). In contrast to regular behavior of the full QCD chiral perturbation theory result, $c_0+c_{l2}m_\pi^2\,\ln{m_\pi^2}+\cdots$, we find that the quenched chiral perturbation theory result, $c_0^Q+(c_{l0}^Q+c_{l2}^Qm_\pi^2)\ln{m_\pi^2}+c_2^Q m_\pi^2+\cdots$, is singular in the chiral limit.

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