Evidence for deconfinement from the J/$\psi$ suppression pattern in Pb- Pb collisions by the NA50 experiment

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The NA50 experiment at CERN has found evidence for deconfinement in central Pb-Pb collisions at 158 A GeV/c at the CERN SPS. The anomalous (with respect to ordinary nuclear absorption) suppression of J/$\psi$ has been observed in 1995 and 1996 data and has been confirmed with the 1998 data analysis,...

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Detalles Bibliográficos
Autores principales: Abreu, M C, Alessandro, B, Alexa, C, Arnaldi, R, Ataian, M R, Baglin, C, Baldit, A, Bedjidian, Marc, Beolè, S, Boldea, V, Bordalo, P, Bussière, A, Capelli, L, Casagrande, L, Castor, J I, Chambon, T, Chaurand, B, Chevrot, I, Cheynis, B, Chiavassa, E, Cicalò, C, Claudino, T, Comets, M P, Constans, N, Constantinescu, S, De Marco, N, De Falco, A, Dellacasa, G, Devaux, A, Dita, S, Drapier, O, Ducroux, L, Espagnon, B, Fargeix, J, Force, P, Gallio, M, Gavrilov, Yu K, Gerschel, C, Giubellino, P, Golubeva, M B, Gonin, M, Grigorian, A A, Grossiord, J Y, Guber, F F, Guichard, A, Gulkanian, H R, Hakobyan, R S, Haroutunian, R, Idzik, M, Jouan, D, Karavitcheva, T L, Kluberg, L, Kurepin, A B, Le Bornec, Y, Lourenço, C, Macciotta, P, MacCormick, M, Marzari-Chiesa, A, Masera, M, Masoni, A, Mehrabyan, S S, Monteno, M, Musso, A, Petiau, P, Piccotti, A, Pizzi, J R, Prino, F, Puddu, G, Quintans, C, Ramos, S, Ramello, L, Rato-Mendes, P, Riccati, L, Romana, A, Ropotar, I, Saturnini, P, Scomparin, E, Serci, S, Shahoyan, R, Silva, S, Sitta, M, Soave, C, Sonderegger, P, Tarrago, X, Topilskaya, N S, Usai, G L, Vercellin, Ermanno, Villatte, L, Willis, N
Lenguaje:eng
Publicado: 2002
Materias:
Particle Physics - Experiment
Acceso en línea:http://cds.cern.ch/record/588639
Descripción
Sumario:The NA50 experiment at CERN has found evidence for deconfinement in central Pb-Pb collisions at 158 A GeV/c at the CERN SPS. The anomalous (with respect to ordinary nuclear absorption) suppression of J/$\psi$ has been observed in 1995 and 1996 data and has been confirmed with the 1998 data analysis, where a detailed study of the suppression pattern vs. centrality has been performed. NA50 results exclude present conventional hadronic models, while they find a natural explanation in the formation of a deconfined state of quarks and gluons. (4 refs).

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