6. Similar spectra
Spectra of strange baryons
(lambda (uds),
xi (dss) and omega (sss)) and
antibaryons (anti-lambda,
anti-xi and anti-omega) as
function of transverse energy,
mtrans. The most
significant feature of the
figure is that the slope
of the spectra for a particle, e.g.
the xi, and its antiparticle are
very similar.
The difference in the particle and
antiparticle yields is a result of
the quarkantiquark asymmetry in
the plasma (figure 1). Data taken at
mid-rapidity in leadlead
collisions at 158 GeV per nucleon
by the CERN WA97 experiment.