$Subthreshold Ξ^{-} production in collisions of p(3.5 GeV)+Nb$

Subthreshold Ξ^{-} production in collisions of p(3.5 GeV)+Nb

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...

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Veröffentlicht in:	Physical review letters 2015-05, Vol.114 (21), p.212301-212301, Article 212301
Hauptverfasser:	Agakishiev, G, Arnold, O, Balanda, A, Belver, D, Belyaev, A V, Berger-Chen, J C, Blanco, A, Böhmer, M, Boyard, J L, Cabanelas, P, Chernenko, S, Dybczak, A, Epple, E, Fabbietti, L, Fateev, O V, Finocchiaro, P, Fonte, P, Friese, J, Fröhlich, I, Galatyuk, T, Garzón, J A, Gernhäuser, R, Göbel, K, Golubeva, M, González-Díaz, D, Guber, F, Gumberidze, M, Heinz, T, Hennino, T, Holzmann, R, Ierusalimov, A, Iori, I, Ivashkin, A, Jurkovic, M, Kämpfer, B, Karavicheva, T, Koenig, I, Koenig, W, Kolb, B W, Kornakov, G, Kotte, R, Krása, A, Krizek, F, Krücken, R, Kuc, H, Kühn, W, Kugler, A, Kurepin, A, Ladygin, V, Lalik, R, Lang, S, Lapidus, K, Lebedev, A, Liu, T, Lopes, L, Lorenz, M, Maier, L, Mangiarotti, A, Markert, J, Metag, V, Michalska, B, Michel, J, Müntz, C, Müntzer, R, Naumann, L, Pachmayer, Y C, Palka, M, Parpottas, Y, Pechenov, V, Pechenova, O, Pietraszko, J, Przygoda, W, Ramstein, B, Reshetin, A, Rustamov, A, Sadovsky, A, Salabura, P, Schmah, A, Schwab, E, Siebenson, J, Sobolev, Yu G, Spataro, S, Spruck, B, Ströbele, H, Stroth, J, Sturm, C, Tarantola, A, Teilab, K, Tlusty, P, Traxler, M, Trebacz, R, Tsertos, H, Vasiliev, T, Wagner, V, Weber, M, Wendisch, C, Wüstenfeld, J, Yurevich, S, Zanevsky, Y V
Format:	Artikel
Sprache:	eng
Schlagworte:	Nuclear Experiment Physics
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Zusammenfassung:	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 P_{Ξ^{-}}=[2.0±0.4(stat)±0.3(norm)±0.6(syst)]×10^{-4} resulting in a Ξ^{-}/(Λ+Σ^{0}) ratio of P_{Ξ^{-}}/P_{Λ+Σ^{0}}=[1.2±0.3(stat)±0.4(syst)]×10^{-2}. Available model predictions are significantly lower than the measured Ξ^{-} yield.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.114.212301