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- W2015808981 abstract "We report measurements of Ξ− and Ξ+ hyperon absolute yields as a function of rapidity in 158 GeV/c Pb+Pb collisions. At midrapidity, dN/dy=2.29±0.12 for Ξ−, and 0.52±0.05 for Ξ+, leading to the ratio of Ξ+/Ξ−=0.23±0.03. Inverse slope parameters fitted to the measured transverse mass spectra are of the order of T≈300 MeV near mid-rapidity. The estimated total yield of Ξ− particles in Pb+Pb central interactions amounts to 7.4±1.0 per collision. Comparison to Ξ− production in properly scaled p+p reactions at the same energy reveals a dramatic enhancement (about one order of magnitude) of Ξ− production in Pb+Pb central collisions over elementary hadron interactions." @default.
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