Phenomenology of the Lambda/Sigma^0 production ratio in pp collisions

Details Phenomenology of the Lambda/Sigma^0 production ratio in pp collisions Phenomenology of the Lambda/Sigma^0 production ratio in pp collisions

2006-08-09

arxiv.org/abs/hep-ph/0608098v1

Eur.Phys.J.A29:363-367,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures

Scientific paper

10.1140/epja/i2006-10097-5

We show that the recently measured asymmetry in helicity-angle spectra of the Lambda-hyperons produced in the reaction pp -> K^+Lambda p reaction and the energy dependence of the total pp -> K^+Lambda p cross section can be explained consistently by the same Lambda p final-state interaction. Assuming that there is no final-state interaction in the Sigma^0 p channel, as suggested by the available data, we can also reproduce the energy dependence of the Lambda/Sigma^0 production ratio and, in particular, the rather large ratio observed near the reaction thresholds. The nominal ratio of the Lambda and Sigma^0 production amplitudes squared, i.e. when disregarding the final-state interaction, turns out to be about 3, which is in line with hyperon production data from proton and nuclear targets available at high energies.

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