Deep Subthreshold Ξ- Production in Ar+KCl Reactions at 1.76AGeV

G. Agakishiev, A. Balanda, R. Bassini, D. Belver, A. V. Belyaev, A. Blanco, M. Böhmer, J. L. Boyard, P. Braun-Munzinger, P. Cabanelas, E. Castro, S. Chernenko, T. Christ, M. Destefanis, J. Díaz, F. Dohrmann, A. Dybczak, T. Eberl, L. Fabbietti, O. V. FateevP. Finocchiaro, P. Fonte, J. Friese, I. Fröhlich, T. Galatyuk, J. A. Garzón, R. Gernhäuser, A. Gil, C. Gilardi, M. Golubeva, D. González-Díaz, F. Guber, T. Hennino, R. Holzmann, I. Iori, A. Ivashkin, M. Jurkovic, B. Kämpfer, K. Kanaki, T. Karavicheva, D. Kirschner, I. Koenig, W. Koenig, B. W. Kolb, R. Kotte, F. Krizek, R. Krücken, W. Kühn, A. Kugler, A. Kurepin, S. Lang, J. S. Lange, K. Lapidus, T. Liu, L. Lopes, M. Lorenz, L. Maier, A. Mangiarotti, J. Markert, V. Metag, B. Michalska, J. Michel, D. Mishra, E. Morinière, J. Mousa, C. Müntz, L. Naumann, J. Otwinowski, Y. C. Pachmayer, M. Palka, Y. Parpottas, V. Pechenov, O. Pechenova, J. Pietraszko, W. Przygoda, B. Ramstein, A. Reshetin, M. Roy-Stephan, A. Rustamov, A. Sadovsky, B. Sailer, P. Salabura, A. Schmah, Yu G. Sobolev, S. Spataro, B. Spruck, H. Ströbele, J. Stroth, C. Sturm, M. Sudol, A. Tarantola, K. Teilab, P. Tlusty, M. Traxler, R. Trebacz, H. Tsertos, V. Wagner, M. Weber, M. Wisniowski, T. Wojcik, J. Wüstenfeld, S. Yurevich, Y. V. Zanevsky, P. Zhou, P. Zumbruch

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Abstract

We report first results on a deep subthreshold production of the doubly strange hyperon Ξ- in a heavy-ion reaction. At a beam energy of 1.76AGeV the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectrometer at SIS18/GSI. A high-statistics and high-purity Λ sample was collected, allowing for the investigation of the decay channel Ξ-→Λπ-. The deduced Ξ-/(Λ+Σ0) production ratio of (5.6±1.2-1.7+1. 8)×10-3 is significantly larger than available model predictions.

Original languageEnglish
Article number132301
JournalPhysical Review Letters
Volume103
Issue number13
DOIs
StatePublished - 23 Sep 2009

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