K${}^{-}$ multi-nucleon absorption cross sections and branching ratios in $\hat{I}›$p and $\hat{I}{\pounds }^0$p final states

Abstract

The determination of low-energy cross sections and branching ratios of the K${}^{-}$ multi-nucleon absorption processes in $\hat{I}›$p and $\hat{I}{\pounds }^0$p final states performed by the AMADEUS collaboration is presented. Low momentum K${}^{-}$ ($p_{\mathrm{K}}\simeq$ 127 MeV/c) produced at the DA$\hat{I}¦$NE collider are impinged on a Carbon target within the KLOE detector and the two and three nucleon absorption processes are disentangled by comparing the experimental data to phenomenological calculations. The $\hat{I}›$p spectra are interpreted in terms of K${}^{-}$ multi-nucleon absorption processes; the possible contribution of a K${}^{-}$pp bound state is demonstrated to overlap with the two nucleon capture process, its absolute yield thus resulting indistinguishable.