J/psi and psi ' production in p, O and S induced reactions at SPS energies

Citation
Mc. Abreu et al., J/psi and psi ' production in p, O and S induced reactions at SPS energies, PHYS LETT B, 466(2-4), 1999, pp. 408-414
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
466
Issue
2-4
Year of publication
1999
Pages
408 - 414
Database
ISI
SICI code
0370-2693(19991104)466:2-4<408:JAP'PI>2.0.ZU;2-C
Abstract
The production of the J/psi and psi' charmonia states has been studied, thr ough their dimuon decay, in proton, Oxygen and Sulphur induced reactions, b y the NA38 experiment at the ERN SPS. The proton data was collected with be ams of 200 and 450 GeV, while the ion beams had an energy of 200 GeV per in cident nucleon. The J/psi production cross-section per nucleon-nucleon coll ision exhibits a remarkably continuous pattern, as a function of the produc t of the mass numbers of the interacting nuclei, from pp up to S-U reaction s. The same pattern is observed within S-U collisions, as a function of the collision centrality. While in p-A interactions both charmonia states exhi bit the same A-dependence, in S-U collisions the psi' production is very st rongly suppressed. (C) 1999 Published by Elsevier Science B.V. All rights r eserved.