Xi and Xi-bar Production in 158 GeV/Nucleon Pb+Pb Collisions

Details Xi and Xi-bar Production in 158 GeV/Nucleon Pb+Pb Collisions Xi and Xi-bar Production in 158 GeV/Nucleon Pb+Pb Collisions

1998-10-07

arxiv.org/abs/nucl-ex/9810005v2

Phys.Lett.B444:523-530,1998

Physics

Nuclear Physics

Nuclear Experiment

15 pages

Scientific paper

10.1016/S0370-2693(98)01399-9

We report measurements of Xi and Xi-bar hyperon absolute yields as a function of rapidity in 158 GeV/c Pb+Pb collisions. At midrapidity, dN/dy = 2.29 +/- 0.12 for Xi, and 0.52 +/- 0.05 for Xi-bar, leading to the ratio of Xi-bar/Xi = 0.23 +/- 0.03. Inverse slope parameters fitted to the measured transverse mass spectra are of the order of 300 MeV near mid-rapidity. The estimated total yield of Xi particles in Pb+Pb central interactions amounts to 7.4 +/- 1.0 per collision. Comparison to Xi production in properly scaled p+p reactions at the same energy reveals a dramatic enhancement (about one order of magnitude) of Xi production in Pb+Pb central collisions over elementary hadron interactions.

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