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arXiv · 1501.03894

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

G. Agakishiev·O. Arnold·A. Balanda·D. Belver·A. V. Belyaev·J. C. Berger-Chen·A. Blanco·M. Böhmer·J. L. Boyard·P. Cabanelas·S. Chernenko·A. Dybczak·E. Epple·L. Fabbietti·O. V. Fateev·P. Finocchiaro·P. Fonte·J. Friese·I. Fröhlich·T. Galatyuk·J. A. Garzon·R. Gernhäuser·K. Göbel·M. Golubeva·D. Gonzalez-Diaz·F. Guber·M. Gumberidze·T. Heinz·T. Hennino·R. Holzmann·A. Ierusalimov·I. Iori·A. Ivashkin·M. Jurkovic·B. Kämpfer·T. Karavicheva·I. Koenig·W. Koenig·B. W. Kolb·G. Kornakov·R. Kotte·A. Krasa·F. Krizek·R. Krücken·H. Kuc·W. Kühn·A. Kugler·A. Kurepin·V. Ladygin·R. Lalik·S. Lang·K. Lapidus·A. Lebedev·T. Liu·L. Lopes·M. Lorenz·L. Maier·A. Mangiarotti·J. Markert·V. Metag·B. Michalska·J. Michel·C. Müntz·L. Naumann·Y. C. Pachmayer·M. Palka·Y. Parpottas·V. Pechenov·O. Pechenova·J. Pietraszko·W. Przygoda·B. Ramstein·A. Reshetin·A. Rustamov·A. Sadovsky·P. Salabura·A. Schmah·E. Schwab·J. Siebenson·Yu. G. Sobolev·S. Spataro·B. Spruck·H. Ströbele·J. Stroth·C. Sturm·A. Tarantola·K. Teilab·P. Tlusty·M. Traxler·R. Trebacz·H. Tsertos·T. Vasiliev·V. Wagner·M. Weber·C. Wendisch·J. Wüstenfeld·S. Yurevich·Y. V. Zanevsky
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Abstract

Results on the production of the double-strange cascade hyperon $\mathrm{Ξ^-}$ 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 $\mathrm{Ξ^-}$ production is observed in proton-nucleus interactions. Assuming a $\mathrm{Ξ^-}$ phase-space distribution similar to that of $\mathrmΛ$ hyperons, the production probability amounts to $P_{\mathrm{Ξ^-}}=(2.0\,\pm0.4\,\mathrm{(stat)}\,\pm 0.3\,\mathrm{(norm)}\,\pm 0.6\,\mathrm{(syst)})\times10^{-4}$ resulting in a $\mathrm{Ξ^-/(Λ+Σ^0)}$ ratio of $P_{\mathrm{Ξ^-}}/\ P_{\mathrm{Λ+Σ^0}}=(1.2\pm 0.3\,\mathrm{(stat)}\pm0.4\,\mathrm{(syst)})\times10^{-2}$. Available model predictions are significantly lower than the estimated $\mathrm{Ξ^-}$ yield.

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G. Agakishiev, O. Arnold, A. Balanda, D. Belver, A. V. Belyaev, J. C. Berger-Chen, A. Blanco, M. Böhmer, J. L. Boyard, P. Cabanelas, S. Chernenko, A. Dybczak, E. Epple, L. Fabbietti, O. V. Fateev, P. Finocchiaro, P. Fonte, J. Friese, I. Fröhlich, T. Galatyuk, J. A. Garzon, R. Gernhäuser, K. Göbel, M. Golubeva, D. Gonzalez-Diaz, F. Guber, M. Gumberidze, T. Heinz, T. Hennino, R. Holzmann, A. Ierusalimov, I. Iori, A. Ivashkin, M. Jurkovic, B. Kämpfer, T. Karavicheva, I. Koenig, W. Koenig, B. W. Kolb, G. Kornakov, R. Kotte, A. Krasa, F. Krizek, R. Krücken, H. Kuc, W. Kühn, A. Kugler, A. Kurepin, V. Ladygin, R. Lalik, S. Lang, K. Lapidus, A. Lebedev, T. Liu, L. Lopes, M. Lorenz, L. Maier, A. Mangiarotti, J. Markert, V. Metag, B. Michalska, J. Michel, C. Müntz, L. Naumann, Y. C. Pachmayer, M. Palka, Y. Parpottas, V. Pechenov, O. Pechenova, J. Pietraszko, W. Przygoda, B. Ramstein, A. Reshetin, A. Rustamov, A. Sadovsky, P. Salabura, A. Schmah, E. Schwab, J. Siebenson, Yu. G. Sobolev, S. Spataro, B. Spruck, H. Ströbele, J. Stroth, C. Sturm, A. Tarantola, K. Teilab, P. Tlusty, M. Traxler, R. Trebacz, H. Tsertos, T. Vasiliev, V. Wagner, M. Weber, C. Wendisch, J. Wüstenfeld, S. Yurevich, Y. V. Zanevsky. 2015-01-16. Subthreshold Xi- Production in Collisions of p(3.5 GeV)+Nb. https://doi.org/10.1103/physrevlett.114.212301

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