Off-shell pion electromagnetic form factor from a gauge-invariant Nambu-Jona-Lasinio model
High Energy Physics - Phenomenology
2009-10-28 v1 Nuclear Theory
Abstract
The off--shell electromagnetic vertex function of pions and kaons is studied in a bosonized Nambu--Jona-Lasinio model with a gauge--invariant proper--time cutoff. The slope of the pion form factor with respect to the pion 4--momentum is found to be equal to the on--shell pion charge radius in the chiral limit. The off--shell slope of the form factor is zero, that of the about 15\% smaller than that of the pion. We compare our results with those of a recent calculation in chiral perturbation theory.
Keywords
Cite
@article{arxiv.hep-ph/9404301,
title = {Off-shell pion electromagnetic form factor from a gauge-invariant Nambu-Jona-Lasinio model},
author = {C. Weiss},
journal= {arXiv preprint arXiv:hep-ph/9404301},
year = {2009}
}
Comments
(9 p., standard LaTeX, 1 PostScript figure appended) UNITUE-THEP-7/94