Pion Eletromagnetic Current in the Ligth-Cone Formalism

Abstract

The electromagnetic form factor of the pion is calculated in a pseudoscalar field theoretical model which constituent quarks. We extract the form factor using the "+" component of the electromagnetic current in the light-cone formalism. For comparison, we also compute the form factor in the covariant framework and we obtain perfect agreement. It is shown that the pair terms do not contribute in this pseudoscalar model. This explains why a naive light-cone calculation, i.e., omitting pair terms from the onset, also yields the same results.

Comments: 11 pages,include figure (pion.eps), use latex,epsf e-mail: nau@itp.uni-hannover.de, pacheco@axpfep1.if.usp.br and tobias@fis.ita.cta.br Submitted to Phys.Letters. B (1997)