| PRODUCTION OF MULTI-STRANGE BARYONS IN Pb-Pb COLLISIONS AT THE SPS ENERGY (2007) | |||||||||||||
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| The first results on the fully corrected ratios of\Omega \Gamma ,\Omega + , \Xi \Gamma and \Xi + detected by the WA97 experiment in Pb-Pb collisions are presented. 1 Introduction The analysis of strange particles yields has been proposed as a useful tool to study the properties of the hot and dense hadronic fireball formed in nuclear collisions. Enhancement of the production of strange particles in nuclear collisions with respect to hadronic collisions has been proposed as a signature of the onset of a quark-gluon plasma (QGP) phase. In particular multi--strange baryons and anti--baryons are interesting since they are especially difficult to be produced in purely hadronic interactions [1, 2]. The WA85 and WA94 experiments reported an enhanced \Xi (jsj = 2) over (jsj = 1) production in S--W and S--S interactions with respect to pp and pA collisions (fig. 1). 0 0.1 0.2 0.3 0.4 pp pS SS pS SS pW SW pW SW AFS WA94 WA85 X ¾ + /L ¾ X - /L X - /L X ¾ + /L ¾ X ¾ + /... | |||||||||||||
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