Towards the Quark Gluon Plasma

Abstract

We discuss recent experimental results in the field of ultra-relativistic nuclear collisions. The emerging ``picture'' is a collectively expanding, initially hot and dense fireball in which strangeness- and low-mass di-lepton pair production are enhanced and J/$\Psi$ production is suppressed compared to expectations from nucleon-nucleon collisions. It is argued that, taken together, these data provide circumstantial evidence that a (at least partly) partonic phase was produced in such collisions.

8 pages, 5 figures, plenary paper, PANIC99 Conference, Uppsala, Sweden, Nucl. Phys. A (in print)

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