The pseudo scalar form factor of the nucleon, the sigma-like term, and the $L_0^{+}$ amplitude for charged pion electro-production near threshold

Abstract

The pseudo scalar form factor, which represents the pseudo scalar quark density distribution due to finite quark masses on the nucleon, is shown to manifest itself with the induced pseudo scalar form factor in the $L_0^{+}$ amplitude for the charged pion electro-production. Both form factors show their own peculiar momentum dependence. Under the approximation on which the Goldberg-Treimann relation holds, a sum of both form factors' contributions accounts for the t-channel contribution in the charged pion electro-production near threshold.

arXiv comment10 pages

References in corpus (6)

• Axial structure of the nucleon
• Renormalization of relativistic baryon chiral perturbation theory and power counting
• Baryon Chiral Perturbation Theory in Manifestly Lorentz Invariant Form
• Low energy analysis of pi N --> pi N
• Pion electroproduction, PCAC, chiral Ward identities, and the axial form factor revisited
• Extraction of the pion-nucleon sigma-term from the spectrum of exotic baryons