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- -> Lambda pi+. The deduced Xi-/(Lambda+Sigma0) production ratio of (5.6±1.2)×10-3 is significantly larger than available model predictions.
Deep Subthreshold Xi- Production in Ar+KCl Reactions at 1.76A GeV
DESTEFANIS, MARCO GIOVANNI;SPATARO, STEFANO GIOVANNI;
2009-01-01
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- -> Lambda pi+. The deduced Xi-/(Lambda+Sigma0) production ratio of (5.6±1.2)×10-3 is significantly larger than available model predictions.
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