Evidence for deconfinement of quarks and gluons from the J/psi suppressionpattern measured in Pb-Pb collisions at the CERN-SPS

Citation
Mc. Abreu et al., Evidence for deconfinement of quarks and gluons from the J/psi suppressionpattern measured in Pb-Pb collisions at the CERN-SPS, PHYS LETT B, 477(1-3), 2000, pp. 28-36
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
477
Issue
1-3
Year of publication
2000
Pages
28 - 36
Database
ISI
SICI code
0370-2693(20000323)477:1-3<28:EFDOQA>2.0.ZU;2-C
Abstract
The analysis of the data collected by the NA50 experiment in 1998, reported in this paper, extends and clarifies the pattern of the previously observe d J/psi, anomalous suppression. This new measurement, besides providing a d eeper understanding of the previous observations, reveals a steady signific ative decrease in the J/psi production rate up to the most central Pb-Pb co llisions. It clearly rules out the presently available conventional (hadron ic) models of J/psi suppression, which unanimously predict a saturation of the J/psi rate for central Pb-Pb collisions. On the contrary and together w ith the sharp onset of the anomalous suppression previously reported, the n ew observation leads to a global production rate pattern which finds its na tural explanation in the framework of the formation of a deconfined state o f quarks and gluons. (C) 2000 Elsevier Science B.V. All rights reserved.