Threshold pi^0 photo- and electro-production in a meson-exchange model

Abstract

We show that, within a meson-exchange dynamical model describing well most of the existing pion electromagnetic production data up to the second resonance region, one is also able to obtain a good agreement with the pi^0 photo- and electroproduction data near threshold. In the case of pi^0 production, the effects of final state interaction in the threshold region are nearly saturated by single charge exchange rescattering. This indicates that in ChPT, it might be sufficient to carry out the calculation just up to one-loop diagrams for threshold neutral pion production.

arXiv comment6 pages LATEX including 1 tables and 4 figures, uses espcrc1.sty

References in corpus (6)

• A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
• Pion cloud and the $Q^2-$dependence of ${\gamma }^{\ast }N\leftrightarrow \Delta$ transition form factors
• Test of low-energy theorems for p(\vec{gamma},π^{0})p in the threshold region
• Pi0 photo- and electroproduction at threshold within a dynamical model
• Improved description of threshold pion electroproduction in chiral perturbation theory
• Neutral pion threshold production at Q^2=0.05 GeV^2/c^2 and Chiral Perturbation Theory