[formula omitted] and θ production from proton to Pb induced reactions at CERN SPS

• Published in: Nuclear physics. A 2003-06, Vol.721, p.C253-C256
• Main Authors: Jouan, Denis, 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, P, Cruz, J, DeFalco, A, DeMarco, 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, L, Ramos, S, Rato Mendes, P, Riccati, L, Romana, A, Santos, H, Saturnini, P, Scalas, E, Scomparin, E, Serci, S, Shahoyan, R, Sigaudo, F, Sitta, M, Sonderegger, P, Tarrago, X, Topilskaya, N.S, Usai, G.L, Vercellin, E, Villatte, L, Willis, N, Wu, T
• Format: Article
• Language: English
• ISSN: 0375-9474
• DOI: 10.1016/S0375-9474(03)01043-1

A new set of results obtained by the NA50 experiment for the J/ψ production at the CERN SPS is presented. Peripheral PbPb collisions benefit from an improved setup, confirming the departure from ordinary production observed for the most central collisions, which has suggested the occurrence of a quark gluon plasma formation. Improved comparative analyses of older datas confirms the θ meson yield increase with centrality and between systems. The interest of the ratio θ ω as a direct measurement of the strangeness increase is underlined.