arXiv:nucl-th/0105038·v2·Nuclear Theory
On the pion electroproduction amplitude
E. Truhlik (Institute of Nuclear Physics, Rez n. Prague, Czechia)🇨🇿
Abstract
We analyze amplitudes for the pion electroproduction on proton derived from Lagrangians based on the local chiral SU(2) x SU(2) symmetries. We show that such amplitudes do contain information on the nucleon axial form factor F_A in both soft and hard pion regimes. This result invalidates recent Haberzettl's claim that the pion electroproduction at threshold cannot be used to extract any information regarding F_A.
Comments: 14 pages, 6 figures, revised version, accepted for publication in Phys. Rev. C