| Article | |
| Report number | CERN-EP-2001-069 |
| Title | The dependence of the anomalous $J/\psi$ suppression on the number of participant nucleons |
| 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 ; Borges, G ; Bussière, A ; Capelli, L ; Castor, J I ; Castanier, C ; Chaurand, B ; Chevrot, I ; Cheynis, B ; Chiavassa, E ; Cicalò, C ; Claudino, T ; Comets, M P ; Constans, N ; Constantinescu, S ; Cortese, P ; De Marco, N ; De Falco, A ; Dellacasa, G ; Devaux, A ; Dita, S ; Drapier, O ; Ducroux, L ; 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 ; 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 |
| Affiliation | (LAPP, CNRS-IN2P3, Annecy-le-Vieux) ; (LPC, Univ. Blaise Pascal and CNRS-IN2P3, Aubière) ; (IFA, Bucharest) ; (Univ. Cagliari/INFN, Cagliari) ; (CERN) ; (LIP, Lisbon) ; (INR, Moscow) ; (IPN, Univ. Paris-Sud and CNRS-IN2P3, Orsay) ; (LPNHE, Ecole Polytechnique and CNRS-IN2P3, Palaiseau) ; (Univ. Torino/INFN, Torino) ; (IPN, Univ. Claude Bernard Lyon-I and CNRS-IN2P3, Villeurbanne) ; (YerPhI, Yerevan) |
| Imprint | 11 Oct 2001. - 20 p. |
| In: | Phys. Lett. B 521 (2001) 195-203 |
| DOI | 10.1016/S0370-2693(01)01225-4 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN SPS ; NA50 |
| Abstract | The observation of an anomalous J/$\psi$ suppression in Pb-Pb collisions by the NA50 collaboration can be considered as the most striking indication for the deconfinement of quarks and gluons at SPS energies. In this letter, we determine the J/$\psi$ suppression pattern as a function of the forward hadronic energy $E_{ZDC}$ measured in a Zero Degree Calorimeter (ZDC). The direct connection between $E_{ZDC}$ and the geometry of the collision allows us to calculate, within a Glauber approach, the precise relation between the number of participant nucleons $N_{part}$ and $E_{ZDC}$. Then, we check if the experimental data can be better explained by a sudden or a smooth onset of the anomalous J/$\psi$ suppression as a function of the number of participants. |
Corresponding record in: Inspire
Email contact: Sandrine.Sciarrino@cern.ch
Record created 2001-10-18, last modified 2018-09-24
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