Strangeness production in the reaction pp→ K+Λp in the threshold region

• Published in: Physics letters. B Vol. 420; no. 1; pp. 217 - 224
• Main Authors: Bilger, R, Böhm, A, Brand, H, Brand, S, Brinkmann, K.-Th, Clement, H, Dellert, M, Dennert, H, 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, Moosburger, M, Morsch, H.P, Nake, Ch, 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
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 19-02-1998
• Subjects: Angular and momentum distributions; Associated strangeness production; Polarization; Total cross section; Polarization; Angular and momentum distributions; 14.40.Aq; 13.88.+e; 14.20.Jn; Total cross section; Associated strangeness production
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/S0370-2693(97)01573-6

The reaction
pp→
K
+
Λp was measured exclusively at the cooler synchrotron COSY at beam momenta of p
Beam = 2.50
GeV/c and p
Beam = 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)
μb and (12.0 ± 0.4)
μb, 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 p
T
≥ 0.3
GeV/c. The results together with existing data are compared with phenomenological parametrizations and model calculations on the basis of meson exchange.