Kaon photoproduction with form factors in a gauge-invariant approach

Details Kaon photoproduction with form factors in a gauge-invariant approach Kaon photoproduction with form factors in a gauge-invariant approach

1998-09-10

arxiv.org/abs/nucl-th/9809026v1

Few Body Syst.Suppl.10:515-518,1999

Physics

Nuclear Physics

Nuclear Theory

LaTeX, 4 pages, 3 figures, requires fbssuppl.sty and epsfig.sty. To appear in the "Proceedings of the 16th European Conference

Scientific paper

The general gauge-invariant photoproduction formalism given by Haberzettl is applied to kaon photoproduction off the nucleon at the tree level, with form factors describing composite nucleons. We demonstrate that, in contrast to Ohta's gauge-invariance prescription, this formalism allows electric current contributions to be multiplied by a form factor, i.e., they do not need to be treated like bare currents. Numerical results show that Haberzettl's gauge procedure, when compared to Ohta's, leads to much improved $\chi^2$ values. Moreover, predictions for the new Bonn SAPHIR data for $p(\gamma,K^+)\Lambda$ are given.

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