Comparing phenomenological recipes with a microscopic model for the electric amplitude in strangeness photoproduction

Details Comparing phenomenological recipes with a microscopic model for the electric amplitude in strangeness photoproduction Comparing phenomenological recipes with a microscopic model for the electric amplitude in strangeness photoproduction

2003-11-27

arxiv.org/abs/nucl-th/0311099v1

Phys.Rev.C68:045206,2003

Physics

Nuclear Physics

Nuclear Theory

10 pages, 6 figures in the text

Scientific paper

10.1103/PhysRevC.68.045206

Corrections to the Born approximation in photo-induced strangeness production off a proton are calculated in a semi-realistic microscopic model. The vertex corrections and internal contributions to the amplitude of the $\gamma p \to K^+ \Lambda$ reaction are included on the one-loop level. Different gauge-invariant phenomenological prescriptions for the modification of the Born contribution via the introduction of form factors and contact terms are discussed. In particular, it is shown that the popular minimal-substitution method of Ohta corresponds to a special limit of the more realistic approach.

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