Delocalization of the axial charge in the chiral limit

Details Delocalization of the axial charge in the chiral limit Delocalization of the axial charge in the chiral limit

2001-08-02

arxiv.org/abs/hep-ph/0108015v2

Phys.Lett. B529 (2002) 105-110

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revised content: Further explanation of the limit m_pi -> 0 and an example of a physical process (spin-spin interaction in a h

Scientific paper

10.1016/S0370-2693(02)01242-X

The nucleon's axial vector charge, g_A, becomes delocalized in the chiral limit. When m_\pi = 0, and SU(2)_L x SU(2)_R is exact, 1/3 of the nucleon's axial charge is to be found at infinite distance from the nucleon. For finite m_\pi this result is approached smoothly as m_\pi -> 0. We illustrate this effect by considering the lepton-proton spin-spin interaction arising from Z^0 exchange as a function of m_\pi. Delocalization may have implications for lattice calculations of g_A and in nuclei.

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