|
Author(s)
|
Abreu, M C ; Alessandro, B ; Alexa, C ; Arnaldi, R ; Ataian, M R ; Baglin, C ; Baldit, A ; Bedjidian, Marc ; Beolè, S ; Boldea, V ; Bordalo, P ; Borenstein, S R ; Borges, G ; Bussière, A ; Capelli, L ; Castor, J I ; Castanier, C ; Chaurand, B ; Cheynis, B ; Chiavassa, E ; Cicalò, 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, Yu K ; Gerschel, C ; Giubellino, P ; Golubeva, M B ; Gonin, M ; Grigorian, A A ; Grigorian, S ; 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 ; Monteno, M ; Musso, A ; Petiau, P ; Piccotti, A ; Pizzi, J R ; Da Silva, W ; 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, Ermanno ; Villatte, L ; Willis, N |
|
Abstract
| 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 midcentrality, 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. (17 refs). |