1. Anomalous suppression in PbPb interactions at 158 GeV/c per nucleon
- Author
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R. Haroutunian, G. Landaud, J.Y. Grossiord, F. Bellaiche, L. Ramello, P. Bordalo, A. Devaux, Paolo Giubellino, S. Silva, B. Cheynis, Petar Temnikov, C. Racca, A. Musso, V. Capony, Carlos Lourenco, L. Kluberg, N.S. Topilskaya, Ermanno Vercellin, Corrado Cicalo, Y. Lebornec, C. Quintans, W.L. Prado da Silva, Bruno Alessandro, C. Vale, I. Chevrot, A. Romana, G. Puddu, F. Ohlsson-Malek, João Cruz, O. Drapier, Y.K. Gavrilov, J. Fargeix, A. Marzari-Chiesa, Calin Alexa, Sergio Serci, Marek Idzik, A. Bussiere, M. Bedjidian, L. Luquin, B. Chaurand, Wladyslaw Dabrowski, C. Gerschel, N. De Marco, C. Soave, A. Guichard, M.B. Golubeva, A. Piccotti, J. Castor, D. Jouan, T. Chambon, X. Tarrago, A. B. Kurepin, F.F. Guber, Serban Constantinescu, G. L. Usai, A. De Falco, J. Astruc, P. Saturnini, N. Willis, L. Riccati, Ph. Gorodetzky, A. Masoni, Stefania Beole, G. Dellacasa, J.R. Pizzi, P. Force, S. Ramos, A. Baldit, S. Sartori, M.C. Abreu, T.L. Karavitcheva, B. Espagnon, Massimo Masera, E. Chiavassa, C. Baglin, P. Rato-Mendes, P. Macciotta, P. Guaita, Sanda Dita, François Fleuret, Mauro Gallio, V. Boldea, P. Petiau, P. Sonderegger, L. Gatignon, G. Bonazzola, S. Mourgues, Enrico Scomparin, A. Borhani, and M. Gonin
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Proton ,Yield (chemistry) ,Quark–gluon plasma ,Drell–Yan process ,Atomic physics ,Expected value ,Nucleon ,Central region ,Ion - Abstract
The Drell-Yan and J ψ cross-sections measured in PbPb collisions are compared with the values extrapolated from the results obtained in proton and light ion induced reactions. While the Drell-Yan production exhibits the normal expected behaviour, the yield of J ψ in PbPb interactions is abnormally low, as it lies 9 standard deviations below the expected value. Moreover, the departure from the expected behaviour increases significantly from peripheral to central collisions.
- Published
- 1997
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