The dependence of the anomalous J/psi suppression on the number of participant nucleons

Citation
Mc. Abreu et al., The dependence of the anomalous J/psi suppression on the number of participant nucleons, PHYS LETT B, 521(3-4), 2001, pp. 195-203
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
521
Issue
3-4
Year of publication
2001
Pages
195 - 203
Database
ISI
SICI code
0370-2693(20011129)521:3-4<195:TDOTAJ>2.0.ZU;2-H
Abstract
The observation of an anomalous J/psi suppression in Pb-Pb collisions by th e 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 hadron ic energy E-ZDC measured in a Zero Degree Calorimeter (ZDC). The direct con nection between EZDC and the geometry of the collision allows us to calcula te, within a Glauber approach, the precise relation between the number of p articipant nucleons N-part and E-ZDC. Then, we check if the experimental da ta 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. (C) 2001 Else vier Science B.V. All rights reserved.