NA50 final results on charmonia suppression

• Published in: Journal of physics. Conference series 2006-11, Vol.50 (1), p.353-356, Article 353
• Main Authors: Quintans, C, Collaboration, the Na50, Alessandro, B, Alexa, C, Arnaldi, R, Atayan, M, Beolè, S, Boldea, V, Bordalo, P, Borges, G, Castanier, C, Castor, J, Chaurand, B, Cheynis, B, Chiavassa, E, Cicalò, C, Comets, M P, Constantinescu, S, Cortese, P, Falco, A De, Marco, N De, Dellacasa, G, Devaux, A, Dita, S, Fargeix, J, Force, P, Gallio, M, Gerschel, C, Giubellino, P, Golubeva, M B, Grigoryan, A A, Grigoryan, S, Guber, F F, Guichard, A, Gulkanyan, H, Idzik, M, Jouan, D, Karavicheva, T L, Kluberg, L, Kurepin, A B, Bornec, Y Le, Lourenço, C, Cormick, M Mac, Marzari-Chiesa, A, Masera, M, Masoni, A, Monteno, M, Musso, A, Petiau, P, Piccotti, A, Pizzi, J R, Prino, F, Puddu, G, Ramello, L, Ramos, S, Riccati, L, Santos, H, Saturnini, P, 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
• Subjects: Heavy ions; High Energy Physics - Experiment; Ionic collisions; Physics; Protons
• ISSN: 1742-6596; 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/50/1/047

The most recent and final results from the NA50 experiment on charmonia production in Pb-Pb interactions at 158 GeV/c per nucleon are presented. A strong J/ψ suppression is observed, which increases with the centrality of the collisions. The J/ψ production is found to be anomalously suppressed starting at mid-centralities, when compared to a reference obtained from proton-induced collisions. The most recent developments on the determination of this normal absorption curve are explained. It is also shown that for sulphur-induced reactions there is full agreement with the extrapolated normal p-A behaviour. The suppression of ψ′ production in heavy ion collisions (Pb-Pb and S-U) is also presented. It is seen to increase with the centrality of the collision and to be significantly stronger than the one measured in proton-induced reactions.