Speaker
Ms
Joana Wirth
(TU München)
Description
The production and properties of $K^0_S$, $K^+$, $\Phi$ and $K^-$ in cold nuclear matter generated in pion-nucleon reactions ($\pi^- + A$, $A = C, W$) at $p_{\pi^-}= 1.7$ GeV/c has been investigated with the HADES detector at GSI.
Similar to the $K^0$ production at the surface of the nuclei ($\sigma \sim A^{b}, b=2/3$), as already verified by the FOPI collaboration, it was assumed to apply also for the $K^+$ and $K^-$ production allowing for the study of in-medium effects. In this context the $K^-$ absorption in nuclear matter which should be apparent through strangeness exchange processes ($K^- N\rightarrow Y\pi$) is investigated, contrary to the $K^+$ with no conventional absorption mechanism known.
In this talk we are presenting the $K^-$ absorption on the basis of the $K^-/K^+$ ratios in both nuclear environments and obtained cross-sections. In addition the $K^-$ production is shown in terms of the $\phi$ feed-down.
* supported by the DFG cluster of excellence "Origin and Structure
of the Universe"
Primary author
Ms
Joana Wirth
(TU München)
