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

G. Agakishiev A. Balanda R. Bassini D. Belver A. V. Belyaev A. Blanco M. Böhmer J. L. Boyard 1 P. Braun-Munzinger P. Cabanelas E. Castro S. Chernenko T. Christ M. Destefanis J. Diaz F. Dohrmann A. Dybczak T. Eberl L. Fabbietti O. V. Fateev P. 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 1 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 1 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
1 IPNO - Institut de Physique Nucléaire d'Orsay
Abstract : We report first results on a deep subthreshold 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 at SIS18/GSI. A high-statistics and high-purity Lambda sample was collected, allowing for the investigation of the decay channel Xi--->Lambdapi-. The deduced Xi-/(Lambda+Sigma0) production ratio of (5.6±1.2-1.7+1.8)×10-3 is significantly larger than available model predictions.
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Submitted on : Tuesday, November 3, 2009 - 3:56:35 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:55 PM

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G. Agakishiev, A. Balanda, R. Bassini, D. Belver, A. V. Belyaev, et al.. Deep sub-threshold $\Xi^-$ production in Ar+KCl reactions at 1.76A GeV. Physical Review Letters, American Physical Society, 2009, 103, pp.132301[5]. ⟨10.1103/PhysRevLett.103.132301⟩. ⟨in2p3-00429587⟩

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