Abstract
Direct probes for the QGP must be hard enough to resolve sub-hadronic scales (⪡ Λ QCD −1) and distinguish confined and deconfined media. This can be achieved by fast colour charges (jets) and heavy quark resonances (quarkonia). After a general survey, we study quarkonia as confinement probe and show in particular that confined matter is transparent, deconfined matter opaque to J ψ ' s .
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