Abstract
Results of the production of Xi(-) and (&UXi;) over bar (+) hyperons are presented for the 10% most central Pb+Pb interactions at 158 GeV/c per nucleon where the average number of participants N-part is about 335. This analysis utilises a global reconstruction procedure, which allows a measurement of 4pi integrated yields to be made for the first time. Inverse slope parameters, which are determined from an exponential fit to the transverse mass spectra, are found to be 267 +/- 9 MeV and 296 +/- 17 MeV for Xi(-) and (&UXi;) over bar (+) hyperons, respectively. Mid-rapidity densities (dN/dy) are found to be 1.49 +/- 10.08 and 0.33 +/- 0.04 particles per event per unit rapidity for Xi(-) and (&UXi;) over bar (+) respectively. The ratio R((&UXi;) over bar (+)Xi(-)) at mid-rapidity, R(y = y(cm)), is found to be 0.22 +/- 0.03.Yields integrated to full phase space are found to be 4.12 +/- 0.20 and 0.77 +/- 0.04 particles per event for Xi(-) and (&UXi;) over bar and respectively. (C) 2002 Elsevier Science B.V. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 275-281 |
| Number of pages | 7 |
| Journal | Physics Letters B |
| Volume | 538(3) |
| Issue number | 3-4 |
| Publication status | Published - 4 Jul 2002 |
Keywords
- NA49
- cascade
- integrated yields
- strangeness enhancement
- heavy-ion collisions
- multi-strange hyperons
- anticascade