Off-shell electromagnetic form factors of pions and kaons in chiral perturbation theory

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Off-shell electromagnetic form factors of pions and kaons in chiral perturbation theory.

The off–shell electromagnetic vertex of a (pseudo–) scalar particle contains, in general, two form factors F and G which depend, in addition to the squared momentum transfer, on the invariant masses associated with the initial and final legs of the vertex. Chiral perturbation theory to one loop is used to calculate the off–shell form factors of pions and kaons. The formalism of Gasser and Leutw...

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The off-shell electromagnetic vertex of the nucleon in chiral perturbation theory

We study the electromagnetic vertex of a nucleon in next-to-leading order chiral perturbation theory (CPT). We consider the case where one of the nucleons at the γNN vertex is off its mass shell. We define relevant measures for the off-shell dependence in the limited kinematical range allowed, and analyze their expansion in the pion mass. The leading nonanalytic contributions are calculated to ...

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ژورنال

عنوان ژورنال: Physical Review C

سال: 1994

ISSN: 0556-2813,1089-490X

DOI: 10.1103/physrevc.50.447