The pK0\Sigma+ final state in proton-proton collisions

TL;DR

This study investigates the pp->pK0 extSigma+ reaction at specific energies, providing cross sections and differential data that suggest the reaction mainly proceeds via certain nucleon resonances, with implications for understanding baryon production.

Contribution

It offers detailed measurements of total and differential cross sections for the reaction at multiple energies, highlighting the dominant resonance contributions and the energy dependence of the transition matrix element.

Findings

Total cross sections scale with available phase space.

Reaction primarily proceeds via N(1710)P11 and/or N(1720)P13 resonances.

Differential data suggest additional resonance contributions.

Abstract

This paper reports results from a study of the reaction pp->pK0\Sigma+ at beam momenta of p_{beam} = 2950, 3059, and 3200 MeV/c (excess energies of \epsilon= 126, 161, and 206 MeV). Total cross sections were determined for all energies; a set of differential cross sections (Dalitz plots; invariant mass spectra of all two-body subsystems; angular distributions of all final state particles; distributions in helicity and Jackson frames) are presented for \epsilon= 161 MeV. The total cross sections are proportional to the volume of available three-body phase-space indicating that the transition matrix element does not change significantly in this range of excess energies. It is concluded from the differential data that the reaction proceeds dominantly via the N(1710)P_{11} and/or N(1720)P_{13} resonance(s); N(1650)S_{11} and \Delta(1600)P_{33} could also contribute.