Summary of the COSY-11 Measurements of Hyperon Production

TL;DR

This paper summarizes COSY-11 hyperon production experiments, presenting precise excitation functions, final state interactions, and measurements of Sigma+ production at specific energies, advancing understanding of hyperon production mechanisms.

Contribution

It provides high-precision excitation functions and final state interaction data for hyperon production in proton-proton collisions, which is novel in this energy range.

Findings

High-precision excitation functions for Lambda and Sigma0 production.

Extraction of Lambda-p and Sigma0-p final state interactions.

Measurement of Sigma+ production at 13 and 60 MeV excess energies.

Abstract

The studies of hyperon production performed at COSY-11 are summarized. The results of the experiments in the reaction channels pp-->pK+Lambda, pp-->pK+Sigma0, and pp-->nK+Sigma+ are shown. Excitation functions fromthreshold up to about 90MeV excess energies have been evaluated with high precision for the Lambda and Sigma0 production. The Lambdap and Sigma0p final state interactions were extracted. The Sigma+ production was measured at 13 and 60 MeV excess energies.