Eur. Phys. J. A (2007) 32: 229-241
https://doi.org/10.1140/epja/i2007-10370-1

Regular Article - Hadron Physics

The pp→K⁺Σ⁺n cross-section from missing-mass spectra

¹ Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany
² Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany

^b j.haidenbauer@fz-juelich.de

Received: 31 January 2007
Accepted: 23 April 2007
Published online: 18 May 2007

Abstract

Abstract.: We utilize existing inclusive data on K⁺-meson momentum spectra of the reaction pp→K⁺X at T_p = 2.3-2.85GeV to deduce total cross-sections for pp→K⁺Σ⁺n. The method used to extract those cross-sections is explained and discussed in detail. Our result for T_p = 2.85GeV is consistent with the data point from a direct measurement at the same beam energy. The cross-section obtained for T_p = 2.3GeV is with 13.7±2.3μb considerably smaller than the value found in a recent experiment by the COSY-11 Collaboration at a somewhat lower beam energy, indicating that the pp→K⁺Σ⁺n reaction cross-section could exhibit a rather unusual energy dependence.