Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-11-27
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.
Korchin Alexander Yu.
Scholten Olaf
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