A new approach to axial coupling constants in the QCD sum rule

Details A new approach to axial coupling constants in the QCD sum rule A new approach to axial coupling constants in the QCD sum rule

1999-08-31

arxiv.org/abs/hep-ph/9908512v1

Phys.Rev.Lett. 84 (2000) 2326-2329

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 1 figure included

Scientific paper

10.1103/PhysRevLett.84.2326

We derive new QCD sum rules for the axial coupling constants by considering two-point correlation functions of the axial-vector currents in a one nucleon state. The QCD sum rules tell us that the axial coupling constants are expressed by nucleon matrix elements of quark and gluon operators which are related to the sigma terms and the moments of parton distribution functions. The results for the iso-vector axial coupling constants and the 8th component of the SU(3) octet are in good agreement with experiment.

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