Latest results onJ/ψ anomalous suppression |
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| Institution: | (1) Università del Piemonte Orientale, Alessandria and INFN-Torino, Italy;(2) LAPP, CNRS-IN2P3, Annecy-le-Vieux, France;(3) LPC, Univ. Blaise Pascal and CNRS-IN2P3, Aubière, France;(4) IFA, Bucharest, Romania;(5) Università di Cagliari/INFN, Cagliari, Italy;(6) CERN, Geneva, Switzerland;(7) LIP, Lisbon, Portugal;(8) INR, Moscow, Russia;(9) IPN, Univ. de Paris-Sud and CNRS-IN2P3, Orsay, France;(10) Laboratoire Leprince-Ringuet, Ecole Polytechnique and CNRS-IN2P3, Palaiseau, France;(11) Università di Torino/INFN, Torino, Italy;(12) IPN, Univ. Claude Bernard Lyon-I and CNRS-IN2P3, Villeurbanne, France;(13) YerPhI, Yerevan, Armenia;(14) IST, Universidade Técnica de Lisboa, Lisbon, Portugal;(15) CERN, Geneva, Switzerland;(16) Fac. Physics and Nuclear Techniques, Univ. Mining and Metallurgy, Cracow, Poland;(17) UERJ, Rio de Janeiro, Brazil |
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| Abstract: | The NA50 experiment deals with Pb-Pb collisions at 158 GeV/nucleon at the CERN SPS accelerator. TheJ/ψ production is studied through the muon decay channel, using the Drell-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 anomalousJ/ψ 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 quark-gluon plasma.
On leave of absence from York College, CUNY, New York USA
On leave of absence from YerPhI, Yerevan, Armenia |
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| Keywords: | J/ψ anomalous suppression quark-gluon plasma deconfinement |
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