Comparison of Lambda and Sigma(0) Threshold Production in Proton-Proton Collisions

Details Comparison of Lambda and Sigma(0) Threshold Production in Proton-Proton Collisions Comparison of Lambda and Sigma(0) Threshold Production in Proton-Proton Collisions

1998-11-05

arxiv.org/abs/nucl-ex/9811004v1

Phys.Rev.Lett.83:682-685,1999

Physics

Nuclear Physics

Nuclear Experiment

13 pages, 3 figures, 1 table

Scientific paper

10.1103/PhysRevLett.83.682

Threshold measurements of the associated strangeness production reactions pp --> p K(+) Lambda and pp --> p K(+) Sigma(0) are presented. Although slight differences in the shapes of the excitation functions are observed, the most remarkable feature of the data is that at the same excess energy the total cross section for the Sigma(0) production appears to be about a factor of 28 smaller than the one for the Lambda particle. It is concluded that strong Sigma(0)-p final state interactions, and in particular the Sigma-N --> Lambda-p conversion reaction, are the likely cause of the depletion for the yield in the Sigma signal. This hypothesis is in line with other experimental evidence in the literature.

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