Cascade and anti-cascade production in central Pb+Pb collisions at 158 GeV/c per nucleon

Details Cascade and anti-cascade production in central Pb+Pb collisions at 158 GeV/c per nucleon Cascade and anti-cascade production in central Pb+Pb collisions at 158 GeV/c per nucleon

2002-02-21

arxiv.org/abs/hep-ex/0202037v1

Phys.Lett. B538 (2002) 275-281

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 9 figures

Scientific paper

Results of the production of Xi and Xi-bar hyperons in central Pb+Pb interactions at 158 GeV/c per nucleon are presented. This analysis utilises a global reconstruction procedure, which allows a measurement of 4pi integrated yields to be made for the first time. Inverse slope paramters, which are determined from an exponential fit to the transverse mass spectra, are shown. Central rapidity densities are found to be 1.49 +- 0.08 and 0.33 +- 0.04 per event per unit of rapidity for Xi and Xi-bar respectively. Yields integrated to full phase space are 4.12 +- 0.02 and 0.77 +- 0.04 for Xi and Xi-bar. The ratio of Xi-bar/Xi at mid-rapidity is 0.22 +- 0.03.

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