Abstract
The NA49 large-acceptance hadron spectrometer has measured strange and
multi-strange hadrons from Pb + Pb and p + p collisions at the CERN SPS.
Preliminary results for the transverse mass and rapidity distributions for
Ξ- and 
from central Pb + Pb collisions at
158 GeV c-1/nucleon are presented. Fully integrated yields per event of 4.42 ± 0.31 and 0.74 ± 0.04 are found for Ξ- and
, respectively, leading to a 4π /Ξ- ratio of 0.17 ± 0.02. The ratio /Ξ-
at mid-rapidity is found to be 0.22 ± 0.04, agreeing with previously
published values. In addition, preliminary data on the Λ(1520)
and ϕ (1020)
resonances are presented. The Λ(1520) multiplicity for p + p
collisions is found to be 0.012 ± 0.003. No signal is observed for Pb +
Pb collisions and a production upper limit of 1.36 Λ(1520) per
event indicates an apparent suppression when comparing with scaled p + p data. Integrated ϕ(1020) yields per
event are found to be 7.6 ± 1.1 for Pb + Pb and 0.012 ± 0.0015
for p + p collisions. No significant shift or broadening of the ϕ(1020)
invariant mass distribution is observed in central Pb + Pb collisions.