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

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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Contributor : Sophie Heurteau <>
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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