/ Experiment-Nucl arXiv:0907.3582

Deep sub-threshold Xi- production in Ar+KCl reactions at 1.76A-GeV

Agakishiev, G. (Giessen U.) ; Balanda, A. (Jagiellonian U.) ; Bassini, R. (INFN, Milan) ; Belver, D. (Santiago de Compostela U.) ; Belyaev, A.V. (Dubna, JINR) ; Blanco, A. (LIP, Coimbra) ; Bohmer, M. (Munich, Tech. U.) ; Boyard, J.L. (Orsay, IPN) ; Braun-Munzinger, P. (Darmstadt, GSI) ; Cabanelas, P. (Santiago de Compostela U.) ; Castro, E. (Santiago de Compostela U.) ; Chernenko, S. (Dubna, JINR) ; Christ, T. (Munich, Tech. U.) ; Destefanis, M. (Giessen U.) ; Diaz, J. (Valencia U., IFIC) ; Dohrmann, F. (Forschungszentrum Dresden Rossendorf) ; Dybczak, A. (Jagiellonian U.) ; Eberl, T. (Munich, Tech. U.) ; Fabbietti, L. (Munich, Tech. U.) ; Fateev, O.V. (Dubna, JINR) ; Finocchiaro, P. (INFN, LNS) ; Fonte, P. (Coimbra Inst. Sup. Eng.) ; Friese, J. (Munich, Tech. U.) ; Frohlich, I. (Frankfurt U., Inst. Kernphys.) ; Galatyuk, T. (Frankfurt U., Inst. Kernphys.) ; Garzon, J.A. (Santiago de Compostela U.) ; Gernhauser, R. (Munich, Tech. U.) ; Gil, A. (Valencia U., IFIC) ; Gilardi, C. (Giessen U.) ; Golubeva, M. (Moscow, INR) ; Gonzalez-Diaz, D. (Darmstadt, GSI) ; Guber, F. (Moscow, INR) ; Hennino, T. (Orsay, IPN) ; Holzmann, R. (Darmstadt, GSI) ; Iori, I. (Milan U.) ; Ivashkin, A. (Moscow, INR) ; Jurkovic, M. (Munich, Tech. U.) ; Kampfer, B. (Dresden, Tech. U.) ; Kanaki, K. (Forschungszentrum Dresden Rossendorf) ; Karavicheva, T. (Moscow, INR) ; Kirschner, D. (Giessen U.) ; Koenig, I. (Darmstadt, GSI) ; Koenig, W. (Darmstadt, GSI) ; Kolb, B.W. (Darmstadt, GSI) ; Kotte, R. (Forschungszentrum Dresden Rossendorf) ; Krizek, F. (Rez, Nucl. Phys. Inst.) ; Krucken, R. (Munich, Tech. U.) ; Kuhn, W. (Giessen U.) ; Kugler, A. (Rez, Nucl. Phys. Inst.) ; Kurepin, A. (Moscow, INR) ; Lang, S. (Darmstadt, GSI) ; Lange, J.S. (Giessen U.) ; Lapidus, K. (Moscow, INR) ; Liu, T. (Orsay, IPN) ; Lopes, L. (LIP, Coimbra) ; Lorenz, M. (Frankfurt U., Inst. Kernphys.) ; Maier, L. (Munich, Tech. U.) ; Mangiarotti, A. (LIP, Coimbra) ; Markert, J. (Frankfurt U., Inst. Kernphys.) ; Metag, V. (Giessen U.) ; Michalska, B. (Jagiellonian U.) ; Michel, J. (Frankfurt U., Inst. Kernphys.) ; Mishra, D. (Giessen U.) ; Moriniere, E. (Orsay, IPN) ; Mousa, J. (Cyprus U.) ; Muntz, C. (Frankfurt U., Inst. Kernphys.) ; Naumann, L. (Forschungszentrum Dresden Rossendorf) ; Otwinowski, J. (Jagiellonian U.) ; Pachmayer, Y.C. (Frankfurt U., Inst. Kernphys.) ; Palka, M. (Darmstadt, GSI) ; Parpottas, Y. (Cyprus U.) ; Pechenov, V. (Darmstadt, GSI) ; Pechenova, O. (Giessen U.) ; Pietraszko, J. (Darmstadt, GSI) ; Przygoda, W. (Jagiellonian U.) ; Ramstein, B. (Orsay, IPN) ; Reshetin, A. (Moscow, INR) ; Roy-Stephan, M. (Orsay, IPN) ; Rustamov, A. (Darmstadt, GSI) ; Sadovsky, A. (Moscow, INR) ; Sailer, B. (Munich, Tech. U.) ; Salabura, P. (Jagiellonian U.) ; Schmah, A. (Munich, Tech. U.) ; Simon, R. (Darmstadt, GSI) ; Sobolev, Yu.G. (Rez, Nucl. Phys. Inst.) ; Spataro, S. (Giessen U.) ; Spruck, B. (Giessen U.) ; Strobele, H. (Frankfurt U., Inst. Kernphys.) ; Stroth, J. (Darmstadt, GSI) ; Sturm, C. (Frankfurt U., Inst. Kernphys.) ; Sudol, M. (Orsay, IPN) ; Tarantola, A. (Frankfurt U., Inst. Kernphys.) ; Teilab, K. (Frankfurt U., Inst. Kernphys.) ; Tlusty, P. (Rez, Nucl. Phys. Inst.) ; Traxler, M. (Darmstadt, GSI) ; Trebacz, R. (Jagiellonian U.) ; Tsertos, H. (Cyprus U.) ; Wagner, V. (Rez, Nucl. Phys. Inst.) ; Weber, M. (Munich, Tech. U.) ; Wisniowski, M. (Jagiellonian U.) ; Wojcik, T. (Jagiellonian U.) ; Wustenfeld, J. (Forschungszentrum Dresden Rossendorf) ; Yurevich, S. (Darmstadt, GSI) ; Zanevsky, Y.V. (Dubna, JINR) ; Zhou, P. (Forschungszentrum Dresden Rossendorf)

Published in: Phys.Rev.Lett.
Year: 2009
Vol.: 103
Page No: 132301
Pages: 4

Abstract: We report first results on a deep sub-threshold production of the doubly strange hyperon $\Xi^-$ in a heavy-ion reaction. At a beam energy of 1.76A GeV the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. A high-statistics and high-purity $\Lambda$ sample was collected, allowing for the investigation of the decay channel $\Xi^- \to \Lambda \pi^-$. The deduced $\Xi^-/(\Lambda+\Sigma^0)$ production ratio of $(5.6 \pm 1.2 ^{+1.8}_{-1.7})\cdot 10^{-3}$ is significantly larger than available model predictions.

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