5 research outputs found
Role of N*(1650) in the near threshold pp --> p Lambda K+ and pp --> p Sigma0 K+ reactions
We investigate the pp --> p Lambda K+ and pp --> p Sigma0 K+ reactions at
beam energies near their thresholds within an effective Lagrangian model, where
the strangeness production proceeds via the excitation of N*(1650), N*(1710),
and N*(1720) baryonic resonances. It is found that the (1650) resonance
dominates both these reactions at near threshold energies. The contributions
from this resonance together with the final state interaction among the
outgoing particles are able to explain the observed beam energy dependence of
the ratio of the cross sections of the two reactions in the near threshold
region.Comment: Revised version, Fig. 4 is updated with the revised data, to appear
in Phys. Rev. C (Rapid Communications