The pp->K+ n Sigma+ reaction near threshold

Details The pp->K+ n Sigma+ reaction near threshold The pp->K+ n Sigma+ reaction near threshold

2007-03-27

arxiv.org/abs/nucl-ex/0703044v1

Phys.Lett.B652:245-249,2007

Physics

Nuclear Physics

Nuclear Experiment

9 pages, 5 figures

Scientific paper

10.1016/j.physletb.2007.07.018

Inclusive K+ production in proton-proton collisions has been measured at a beam energy of 2.16 GeV using the COSY-ANKE magnetic spectrometer. The resulting spectrum, as well as those corresponding to K+ p and K+ pi+ correlated pairs, can all be well described using consistent values of the total cross sections for the pp->K+ p Lambda, pp->K+ p Sigma0, and pp->K+ n Sigma+ reactions. While the resulting values for Lambda and Sigma0 production are in good agreement with world data, our value for the total Sigma+ production cross section, sigma(pp->K+ n Sigma+) = 2.5+/-0.6(stat)+/-0.4(syst) mkb at an excess energy of epsilon=129 MeV, could only be reconciled with other recently published data if there were a highly unusual near--threshold behaviour.

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