Centrality Behaviour of J/$ψ$ Production in Na50

Details Centrality Behaviour of J/$ψ$ Production in Na50 Centrality Behaviour of J/$ψ$ Production in Na50

2001-11-29

arxiv.org/abs/hep-ph/0111429v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 7 figures (in eps) talk given at XXXI International Symposium on Multiparticle Dynamics, Sep. 1-7, 2001, Datong China

Scientific paper

The J/$\psi$ production in 158 A GeV Pb-Pb interactions is studied, in the dimuon decay channel, as a function of centrality, as measured with the electromagnetic or with the very forward calorimeters. After a first sharp variation at mid centrality, both patterns continue to fall down and exhibit a curvature change at high centrality values. This trend excludes any conventional hadronic model and is in agreement with a deconfined quark-gluon phase scenario. We report also preliminary results on the measured charged multiplicity, as given by a dedicated detector.

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