Centrality behaviour of $J/ \psi$ production in NA50

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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...

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Detalles Bibliográficos
Autores principales: Abreu, M.C., Alessandro, B., Alexa, C., Arnaldi, R., Atayan, M., Baglin, C., Baldit, A., Bedjidian, M., Beole, S., Boldea, V., Bordalo, P., Borenstein, S.R., Borges, G., Bussiere, A., Capelli, L., Castor, J., Castanier, C., Chaurand, B., Cheynis, B., Chiavassa, E., Cicalo, C., Claudino, T., Comets, M.P., Constans, N., Constantinescu, S., Cortese, P., Cruz, J., De Marco, N., De Falco, A., Dellacasa, G., Devaux, A., Dita, S., Drapier, O., Espagnon, B., Fargeix, J., Force, P., Gallio, M., Gavrilov, Y.K., Gerschel, C., Giubellino, P., Golubeva, M.B., Gonin, M., Grigorian, A.A., Grigorian, S., Grossiord, J.Y., Guber, F.F., Guichard, A., Gulkanyan, H., Hakobyan, R., Haroutunian, R., Idzik, M., Jouan, D., Karavitcheva, T.L., Kluberg, L., Kurepin, A.B., Le Bornec, Y., Lourenco, C., Macciotta, P., Cormick, M.Mac, Marzari-Chiesa, A., Masera, M., Masoni, A., Monteno, M., Musso, A., Petiau, P., Piccotti, A., Pizzi, J.R., Prado da Silva, W.L., Prino, F., Puddu, G., Quintans, C., Ramos, S., Ramello, L., Rato Mendes, P., Riccati, L., Romana, A., Santos, H., Saturnini, P., Scalas, E., Scomparin, E., Serci, S., Shahoyan, R., Sigaudo, F., Silva, S., Sitta, M., Sonderegger, P., Tarrago, X., Topilskaya, N.S., Usai, G.L., Vercellin, E., Villatte, L., Willis, N.
Lenguaje:eng
Publicado: 2001
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1142/9789812778048_0021
http://cds.cern.ch/record/528730
Descripción
Sumario: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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