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

Abstract : Results on the production of the double-strange cascade hyperon Ξ− 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 Ξ− production is observed in proton-nucleus interactions. Assuming a Ξ− phase-space distribution similar to that of Λ hyperons, the production probability amounts to PΞ−=(2.0±0.4(stat)±0.3(norm)±0.6(syst))×10−4 resulting in a Ξ−/(Λ+Σ0) ratio of PΞ−/ PΛ+Σ0=(1.2±0.3(stat)±0.4(syst))×10−2. Available model predictions are significantly lower than the estimated Ξ− yield.
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Submitted on : Monday, January 19, 2015 - 2:53:52 PM
Last modification on : Friday, April 30, 2021 - 10:21:52 AM

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G. Agakishiev, O. Arnold, A. Balanda, D. Belver, A. v. Belyaev, et al.. Subthreshold Xi- Production in Collisions of p(3.5 GeV)+Nb. Physical Review Letters, American Physical Society, 2015, 114 (21), pp.212301. ⟨10.1103/PhysRevLett.114.212301⟩. ⟨in2p3-01104937⟩



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