Nuclear transparency and effective kaon-nucleon cross section from the A(e, e'K+) reaction

Abstract

We have determined the transparency of the nuclear medium to kaons from $A(e,e^{{}^{\prime }}{K}^{+})$ measurements on ${}^{12}$C, ${}^{63}$Cu, and ${}^{197}$Au targets. The measurements were performed at the Jefferson Laboratory and span a range in four-momentum-transfer squared Q${}^2$=1.1 -- 3.0 GeV${}^2$. The nuclear transparency was defined as the ratio of measured kaon electroproduction cross sections with respect to deuterium, (${\sigma }^A/{\sigma }^D$). We further extracted the atomic number ($A$) dependence of the transparency as parametrized by $T=(A/2{)}^{\alpha -1}$ and, within a simple model assumption, the in-medium effective kaon-nucleon cross sections. The effective cross sections extracted from the electroproduction data are found to be smaller than the free cross sections determined from kaon-nucleon scattering experiments, and the parameter $\alpha$ was found to be significantly larger than those obtained from kaon-nucleus scattering. We have included similar comparisons between pion- and proton-nucleon effective cross sections as determined from electron scattering experiments, and pion-nucleus and proton-nucleus scattering data.

7 pages, 5 figures

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Cited by in corpus (2)

• Color transparency of $K^{+}$ meson produced in the inclusive $(e,e^{\prime })$ reaction on nuclei
• Transparency of the $\gamma (n,p){\pi }^{-}$ reaction in nuclei