Threshold hyperon production in proton-proton collisions at COSY-11

Details Threshold hyperon production in proton-proton collisions at COSY-11 Threshold hyperon production in proton-proton collisions at COSY-11

2006-07-31

arxiv.org/abs/nucl-ex/0607034v2

Phys.Lett.B643:251-256,2006

Physics

Nuclear Physics

Nuclear Experiment

7 pages, 8 figures, Phys. Lett. B in print, in the second version a minor editorial changes have been made by a native speakin

Scientific paper

10.1016/j.physletb.2006.07.066

Sigma+ hyperon production was measured at the COSY-11 spectrometer via the p p --> n K+ Sigma+ reaction at excess energies of Q = 13 MeV and Q = 60 MeV. These measurements continue systematic hyperon production studies via the p p --> p K+ Lambda/Sigma0 reactions where a strong decrease of the cross section ratio close-to-threshold was observed. In order to verify models developed for the description of the Lambda and Sigma0 production we have performed the measurement on the Sigma+ hyperon and found unexpectedly that the total cross section is by more than one order of magnitude larger than predicted by all anticipated models. After the reconstruction of the kaon and neutron four momenta, the Sigma+ is identified via the missing mass technique. Details of the method and the measurement will be given and discussed in view of theoretical models.

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