Xi and (Xi)over-bar production in 158 GeV/nucleon Pb+Pb collisions

Citation
H. Appelhauser et al., Xi and (Xi)over-bar production in 158 GeV/nucleon Pb+Pb collisions, PHYS LETT B, 444(3-4), 1998, pp. 523-530
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
444
Issue
3-4
Year of publication
1998
Pages
523 - 530
Database
ISI
SICI code
0370-2693(199812)444:3-4<523:XA(PI1>2.0.ZU;2-G
Abstract
We report measurements of Xi(-) and (Xi)over-bar(+) hyperon absolute yields as a function of rapidity in 158 GeV/c Ph + Pb collisions. At midrapidity, dN/dy = 2.29 +/- 0 12 for Xi(-), and 0.52 +/- 0.05 for (Xi)over-bar(+), le ading to the ratio of (Xi)over-bar(+)/Xi(-) = 0.23 +/- 0.03. Inverse slope parameters fitted to the measured transverse mass spectra are of the order of T approximate to 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 reaction s at the same energy reveals a dramatic enhancement (about one order of mag nitude) of Xi(-) production in Pb + Pb central collisions over elementary h adron interactions. (C) 1998 Elsevier Science B.V. All rights reserved.