Axial form-factor and induced pseudoscalar form-factor of the nucleons

Details Axial form-factor and induced pseudoscalar form-factor of the nucleons Axial form-factor and induced pseudoscalar form-factor of the nucleons

2006-01-09

arxiv.org/abs/hep-ph/0601060v2

Eur.Phys.J.C47:375-384,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 12 figures, revised version

Scientific paper

10.1140/epjc/s2006-02570-2

In this article, we calculate the axial and the induced pseudoscalar form-factors $G_A(t=-Q^2)$ and $G_P(t=-Q^2)$ of the nucleons in the framework of the light-cone QCD sum-rules approach up to twist-6 three valence quark light-cone distribution amplitudes, and observe that the form-factors $G_A(t=-Q^2)$ and $G_P(t=-Q^2)$ at intermediate and large momentum transfers with $Q^2> 2 GeV^2$ have significant contributions from the end-point (soft) terms. The numerical values for the axial form-factor $G_A(t=-Q^2)$ are compatible with the experimental data and theoretical calculations, for example, the chiral quark models and lattice QCD. The numerical values for the induced pseudoscalar form-factor $G_P(t=-Q^2)$ are compatible with the calculation from the Bethe-Salpeter equation.

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