Strangeness Production in the Reaction pp→ pK+λ in the Threshold Region
Strangeness Production in the Reaction pp→ pK+λ in the Threshold Region
Bilger, R.; Böhm, A.; Brand, S.; Brand, H.; Brinkmann, K.-T.; Clement, H.; Cloth, P.; Dahmen, M.; Dellert, M.; Dennert, H.; Dshemuchadse, S.; Eyrich, W.; Filges, D.; Freiesleben, H.; Fritsch, M.; Geyer, R.; Hassan, A.; Hauffe, J.; Herrmann, P.; Hübner, B.; Jahn, P.; Kilian, K.; Kirsch, M.; Koch, H.; Kress, J.; Krug, J.; Kuhlmann, E.; Lange, J. S.; Metzger, A.; Michel, P.; Möller, K.; Morsch, H. P.; Moosburger, M.; Nake, C.; Nann, H.; Naumann, B.; Naumann, L.; Ringe, P.; Roderburg, E.; Rogge, M.; Schamlott, A.; Schönmeier, P.; Schülke, A.; Sperl, R.; Steinke, M.; Stinzing, F.; Turek, P.; Wagner, G. J.; Wirth, S.; Zielinski, U.
The reaction pp → K+ λ,p was measured exclusively at the cooler synchrotron COSY at beam momenta of pBeam = 2.50 GeV/c and pBeam = 2.75 GeV/c using the TOF detector. Angular and momentum distributions were obtained for the full phase space of the reaction products. Total cross sections were extracted to be (2.7 ± 0.3)μ b and (12.0 ± 0.4) μ b,
respectively. The polarization of the λ-hyperon was determined as a function of its transversal momentum and was found to be negative for transverse momentum transfers of pT ≥ 0.3 GeV/c. The results together with existing data are compared with phenomenological parameterizations and model calculations on the basis of meson exchange.
- Phys. Lett. B 420 (1998) 217
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