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arXiv · hep-ph/9404301

Off-shell pion electromagnetic form factor from a gauge-invariant Nambu-Jona-Lasinio model

C. Weiss
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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 $K^0$ form factor is zero, that of the $K^\pm$ about 15\% smaller than that of the pion. We compare our results with those of a recent calculation in chiral perturbation theory.

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C. Weiss. 1994-04-19. Off-shell pion electromagnetic form factor from a gauge-invariant Nambu-Jona-Lasinio model. https://doi.org/10.1016/0370-2693(94)90999-7

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