Subthreshold Xi- Production in Collisions of p(3.5 GeV)+Nb

Abstract

Results on the production of the double-strange cascade hyperon ${\mathrm{\Xi }}^{-}$ are reported for collisions of p\,(3.5~GeV)\,+\,Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. For the first time, subthreshold ${\mathrm{\Xi }}^{-}$ production is observed in proton-nucleus interactions. Assuming a ${\mathrm{\Xi }}^{-}$ phase-space distribution similar to that of $\mathrm{\Lambda }$ hyperons, the production probability amounts to $P_{{\mathrm{\Xi }}^{-}}=(2.0\pm 0.4(\mathrm{stat})\pm 0.3(\mathrm{norm})\pm 0.6(\mathrm{syst}))\times 10^{-4}$ resulting in a ${\mathrm{\Xi }}^{-}/(\mathrm{\Lambda }+{\mathrm{\Sigma }}^0)$ ratio of $P_{{\mathrm{\Xi }}^{-}}/P_{\mathrm{\Lambda }+{\mathrm{\Sigma }}^0}=(1.2\pm 0.3(\mathrm{stat})\pm 0.4(\mathrm{syst}))\times 10^{-2}$. Available model predictions are significantly lower than the estimated ${\mathrm{\Xi }}^{-}$ yield.

6 pages, 3 figures

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• Medium effects in antikaon-induced ${\Xi }^{-}$ hyperon production on nuclei near threshold