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arxiv: 0907.3582 · v1 · pith:TI36B5EQnew · submitted 2009-07-21 · ⚛️ nucl-ex

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. B\"ohmer , J. L. Boyard
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P. Braun-Munzinger P. Cabanelas E. Castro S. Chernenko T. Christ M. Destefanis J. D\'iaz F. Dohrmann A. Dybczak T. Eberl L. Fabbietti O. V. Fateev P. Finocchiaro P. Fonte J. Friese I. Fr\"ohlich T. Galatyuk J. A. Garz\'on R. Gernh\"auser A. Gil C. Gilardi M. Golubeva D. Gonz\'alez-D\'iaz F. Guber T. Hennino R. Holzmann I. Iori A. Ivashkin M. Jurkovic B. K\"ampfer K. Kanaki T. Karavicheva D. Kirschner I. Koenig W. Koenig B. W. Kolb R. Kotte F. Krizek R. Kr\"ucken W. K\"uhn 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. Morini\`ere J. Mousa C. M\"untz 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. Str\"obele 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. W\"ustenfeld S. Yurevich Y. V. Zanevsky P. Zhou
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keywords lambdaproductiondeepreactionsub-thresholdacceptanceallowingavailable
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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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