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Titolo:
Observation of a threshold effect in the anomalous J/psi suppression
Autore:
Abreu, MC; Alessandro, B; Alexa, C; Arnaldi, R; Astruc, J; Atayan, M; Baglin, C; Baldit, A; Bedjidian, M; Bellaiche, F; Beole, S; Boldea, V; Bordalo, P; Bussiere, A; Capony, V; Casagrande, L; Castor, J; Chambon, T; Chaurand, B; Chevrot, I; Cheynis, B; Chiavassa, E; Cicalo, C; Comets, MP; Constans, N; Constantinescu, S; Cruz, J; De Falco, A; Dellacasa, G; De Marco, N; Devaux, A; Dita, S; Drapier, O; Espagnon, B; Fargeix, J; Filippov, SN; Fleuret, F; Force, P; Gallio, M; Gatignon, L; Gavrilov, YK; Gerschel, C; Giubellino, P; Golubeva, MB; Gonin, M; Grigorian, AA; Grossiord, JY; Guber, FF; Guichard, A; Gulkanyan, H; Hakobyan, R; Haroutunian, R; Idzik, M; Jouan, D; Karavitcheva, TL; Kluberg, L; Kurepin, AB; Le Bornec, Y; Lourenco, C; Luquin, L; Mac Cormick, M; Macciotta, P; Marzari-Chiesa, A; Masera, M; Masoni, A; Mehrabyan, S; Monteno, M; Mourgues, S; Musso, A; Ohlsson-Malek, F; Petiau, P; Piccotti, A; Pizzi, JR; da Silva, WLP; Prino, F; Puddu, G; Quintans, C; Racca, C; Ramello, L; Ramos, S; Rato-Mendes, P; Riccati, L; Romana, A; Ropotar, I; Saturnini, P; Scomparin, E; Serci, S; Shahoyan, R; Silva, S; Sitta, M; Soave, C; Sonderegger, P; Tarrago, X; Temnikov, P; Topilskaya, NS; Usai, GL; Vercellin, E; Willis, N;
Indirizzi:
Lab Instrumentacao & Fis Expt Particulas, LIP, Lisbon, Portugal Lab Instrumentacao & Fis Expt Particulas Lisbon Portugal sbon, Portugal Univ Piemonte Orientale, Alessandria, Italy Univ Piemonte Orientale Alessandria Italy Orientale, Alessandria, Italy Ist Nazl Fis Nucl, I-10125 Turin, Italy Ist Nazl Fis Nucl Turin Italy I-10125 azl Fis Nucl, I-10125 Turin, Italy CNRS, IN2P3, LAPP, Phys Particules Lab, Annecy Le Vieux, France CNRS Annecy Le Vieux France hys Particules Lab, Annecy Le Vieux, France Univ Blaise Pascal, CNRS, IN2P3, Phys Corpusculaire Lab, Aubiere, France Univ Blaise Pascal Aubiere France ys Corpusculaire Lab, Aubiere, France Inst Atom Phys, R-76900 Bucharest, Romania Inst Atom Phys Bucharest Romania R-76900 hys, R-76900 Bucharest, Romania Univ Cagliari, Ist Nazl Fis Nucl, Cagliari, Italy Univ Cagliari CagliariItaly gliari, Ist Nazl Fis Nucl, Cagliari, Italy CERN, Geneva, Switzerland CERN Geneva SwitzerlandCERN, Geneva, Switzerland Russian Acad Sci, Inst Nucl Res, Moscow, Russia Russian Acad Sci Moscow Russia Acad Sci, Inst Nucl Res, Moscow, Russia Univ Paris Sud, CNRS, IN2P3, IPNO, Orsay, France Univ Paris Sud Orsay France Paris Sud, CNRS, IN2P3, IPNO, Orsay, France Ecole Polytech, CNRS, IN2P3, LPNHE, F-91128 Palaiseau, France Ecole Polytech Palaiseau France F-91128 LPNHE, F-91128 Palaiseau, France Univ Strasbourg 1, CNRS, IN2P3, Ctr Rech Nucl, Strasbourg, France Univ Strasbourg 1 Strasbourg France , Ctr Rech Nucl, Strasbourg, France Univ Turin, Ist Nazl Fis Nucl, Turin, Italy Univ Turin Turin ItalyUniv Turin, Ist Nazl Fis Nucl, Turin, Italy Univ Lyon 1, CNRS, IN2P3, Inst Phys Nucl Lyon, F-69622 Villeurbanne, France Univ Lyon 1 Villeurbanne France F-69622 on, F-69622 Villeurbanne, France Yerevan Phys Inst, Yerevan 375036, Armenia Yerevan Phys Inst Yerevan Armenia 375036 s Inst, Yerevan 375036, Armenia Univ Algarve, Unidad Ciencias Exactas & Humanas, P-8000 Faro, Portugal Univ Algarve Faro Portugal P-8000 actas & Humanas, P-8000 Faro, Portugal Univ Tecn Lisbon, Inst Super Tecn, P-1096 Lisbon, Portugal Univ Tecn Lisbon Lisbon Portugal P-1096 er Tecn, P-1096 Lisbon, Portugal
Titolo Testata:
PHYSICS LETTERS B
fascicolo: 4, volume: 450, anno: 1999,
pagine: 456 - 466
SICI:
0370-2693(19990325)450:4<456:OOATEI>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
PB-PB INTERACTIONS; QUARK-GLUON PLASMA; 158 GEV/C; NUCLEUS COLLISIONS; DISTRIBUTIONS; PHYSICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Abreu, MC Lab Instrumentacao & Fis Expt Particulas, LIP, Lisbon, Portugal Lab Instrumentacao & Fis Expt Particulas Lisbon Portugal ugal
Citazione:
M.C. Abreu et al., "Observation of a threshold effect in the anomalous J/psi suppression", PHYS LETT B, 450(4), 1999, pp. 456-466

Abstract

We report on a search for a phase transition from ordinary nuclear matter to a state of deconfined quarks and gluons as predicted by lattice QCD calculations. A new measurement of charmonium production in Pb-Pb interactions at 158 GeV/c per nucleon agrees with our previous results and confirms the anomalous J/psi suppression we had already observed on a significantly smaller data sample. New event selection and analysis techniques show that, forperipheral collisions, the J/psi cross-section per nucleon-nucleon collision agrees with the precise suppression pattern inferred from a wide range of measurements extending from p-p up to S-U collisions. As the collisions become more central, the Pb-Pb cross-section exhibits a clear departure fromthis normal behaviour. The onset of the anomalous J/psi suppression reported here is the first clear observation of a threshold effect in heavy ion collisions and can be considered as a strong indication of the production ofa deconfined quark-gluon phase in central Pb-Pb collisions. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 05/12/20 alle ore 23:34:35