Latest results on $J/e???$ anomalous suppression

摘要

The NA50 experiment deals with Pba€“Pb collisions at 158 GeVucleon at the CERN SPS accelerator. The $J/e???$ production is studied through the muon decay channel, using the Drella€“Yan dimuons as a reference. New results based on recent analyses, from data taken with improved experimental conditions and using different centrality estimators, are presented and compared to an update of those already obtained from previous data samples. The stepwise pattern of the anomalous $J/e???$ suppression as a function of centrality, already present in these previous results, is confirmed. This observation could be a fingerprint of the theoretically predicted melting of charmonia resonances in a deconfined quarka€“gluon plasma.