Transverse momentum and transverse mass distributions of mesons produced in p-A and Pb-Pb interactions at the CERN SPS

Kurepin, A. B.; Alessandro, B.; Alexa, C.; Arnaldi, R.; Atayan, M.; Baglin, C.; Baldit, A.; Bedjidian, M.; Beolè, S.; Boldea, V.; Bordalo, P.; Borenstein, S. R.; Borges, G.; Bussière, A.; Capelli, L.; Castanier, C.; Castor, J.; Chaurand, B.; Cheynis, B.; Chiavassa, E.; Cicalò, C.; Claudino, T.; Comets, M. P.; Constantinescu, S.; Cortese, Pietro; Cruz, J.; De Falco, A.; De Marco, N.; 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.; Lourenço, C.; Macciotta, P.; Mac Cormick, M.; 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.; Ramello, Luciano; Ramos, S.; Rato Mendes, P.; Riccati, L.; Romana, A.; Santos, H.; Saturnini, P.; Scalas, E.; Scomparin, E.; Serci, S.; Shahoyan, R.; Sigaudo, F.; Sitta, Mario; Sonderegger, P.; Tarrago, X.; Topilskaya, N. S.; Usai, G. L.; Vercellin, E.; Villatte, L.; Willis, N.; Wu, T.

doi:10.1016/S0375-9474(03)01042-X

We present a study of the transverse momentum and transverse mass of J/11,mesons pro- duced in nucleus-nucleus and p-nucleus reactions. They include the most recent data col- lected by the NA50 experiment in Pb-Pb and p-A reactions at 158 GeV/c and 400 GeV/c incident momentum respectively. Together with S-U results previously published by ex- periment NA38, the mean squared transverse momentum of J/Psi mesons exhibit a scaling behaiiour which could result from initial state parton interaction. However, for the most central Pb-Pb collisions a saturation effect is observed as a function of centrality.