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

Abstract

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 $Q^2>2Ge{V}^2$ 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.

21 pages, 12 figures, revised version

References in corpus (8)

• Axial structure of the nucleon
• Higher Twist Distribution Amplitudes of the Nucleon in QCD
• Light-Cone Sum Rules for the Nucleon Form Factors
• Soft contribution to the pion form factor from light-cone QCD sum rules
• $\pi N\sigma$ Term , $\bar{s}s$ in Nucleon, and Scalar Form Factor --- a Lattice Study
• Nucleon Form Factors in a Covariant Diquark-Quark Model
• Light-cone QCD sum rules for the semileptonic decay Lambda_b --> p lepton anti-neutrino
• Axial-vector form factors of the nucleon within the chiral quark-soliton model and their strange components

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• Light Cone QCD Sum Rules Analysis of the Axial N -> Delta Transition Form Factors
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