Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2005-05-20
J.Phys. G32 (2006) S381-S390
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 5 figures, XXXXth Rencontres de Moriond conference
Scientific paper
We present the final results of experiment NA50 on charmonia production in Pb-Pb interactions at 158 A GeV. A strong increasing suppression is observed with increasing centrality, for both the jpsi and psiprime resonances. We also present new developments regarding the jpsi and psiprime normal nuclear absorption determinations deduced from proton-nucleus data only. Their comparison with Pb-Pb results allows us to conclude that the jpsi anomalous suppression sets in at mid-centralities while the S-U results show a reasonable agreement with the p-A behavior. The psiprime suffers a significantly stronger suppression already in S-U interactions, which continuously increases in the Pb-Pb system, and is completely incompatible with the expected behavior deduced from p-A collisions.
Borges G.
for the NA50 Collaboration
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