K^+ production in p-C-collisions at a beam energy 1.2 GeV

Abstract

The isobar model and the resonance model are applied for the first analysis of the subthreshold $K^{+}$-meson production in proton-carbon collisions, which was perfomed at GSI at an emission angle of 40 degrees and a bombarding energy of 1.2 GeV. In this study, we focus on the role of the secondary processes $\pi N\to K^{+}Y$ in normal nuclear matter density. It turns out that the present approach can reproduce very well both the ${\pi }^{+}$- and $K^{+}$- meson spectra. It is also demonstrated that the different kinds of descriptions for the $\pi N\to K^{+}\Lambda$ reactions substantially differentiate the calculated results for the $pA\to K^{+}X$ differential cross sections.

Comments: Latex 6 pages with 4 figures (eps file)