We report results on the production of strange baryons/antibaryons with 1, 2, and 3 units of strangeness (Λ, Ξ and Ω) and mesons (K
s
0,
K
+ and
K
−) in WA85 experiment at the CERN SPS. This ...experiment was designed to study the production of strange particles in central SW collisions at 200 GeV/c per nucleon, in the central rapidity region with medium to high
p
t
. We have measured the inverse slopes of the
m
t
distributions of such particles and the production ratios
Λ
/Λ,
Ξ
+
/Ξ
−,
Ξ
−/
Λ,
Ξ
+/
Λ
, K
s
0/
Λ,
K
s
0/
Λ
,
(Ω
− +
Ω
+)
(Ξ
− +
Ξ
+)
and
K
+
K
−
. Preliminary results on the production ratios
Ξ
−/
Λ and
Ξ
+/
Λ
in pW collisions at 200 GeV/c are also presented.
Recent results on strange baryons and antibaryon production in Pb-Pb collisions at 160 GeV per nucleon from the NA57 experiment are reported. Strangeness enhancements and the transverse mass spectra ...properties are described.
The WA97 experiment has measured the transverse mass (
m
T) spectra for negative hadrons (h
−) and strange particles produced at mid-rapidity in Pb−Pb collisions. The increased statistics of analysed ...data samples allowed us to perform a study of the spectra of K
0
S, Λ, Ξ, Ω and h
− as a function of the centrality of the collisions. The data, which correspond to the most central 40% of the total inelastic cross section, have been divided into four centrality classes according to the estimated number of nucleons taking part in the collision. The
m
T spectra, analysed separately for each centrality bin, exhibit only weak (≤ 15%) centrality dependence. The deviation of the Ω inverse slope from the linear dependence on the particle mass is confirmed even for the most central Pb−Pb collisions.
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