Charged particle production in the Pb plus Pb system at 158 GeV/c per nucleon - art. no. 014903

Citation
P. Deines-jones et al., Charged particle production in the Pb plus Pb system at 158 GeV/c per nucleon - art. no. 014903, PHYS REV C, 6201(1), 2000, pp. 4903
Citations number
55
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW C-NUCLEAR PHYSICS
ISSN journal
0556-2813 → ACNP
Volume
6201
Issue
1
Year of publication
2000
Database
ISI
SICI code
0556-2813(200007)6201:1<4903:CPPITP>2.0.ZU;2-9
Abstract
Charged particle multiplicities from high-multiplicity interactions of 158 GeV/nucleon Pb ions with Pb target nuclei have been measured using high-res olution nuclear emulsion chambers with sensitivity from the peak of the pse udorapidity distribution forward to eta>9 The characteristics of these inte ractions have been compared to those of central interactions of 200 GeV/nuc leon proton, O, and S beams on silver or bromine targets and to results fro m simulations using the FRITIOF 7.02 and VENUS 4.12 Monte Carlo event gener ators. Multiplicities scale with the number of wounded nucleons, although t he multiplicities for Pb+Pb interactions in the central region are signific antly lower than predicted by either Monte Carlo model. We examine the shap e of the pseudorapidity distribution and its dependence on centrality in de tail, because in this symmetric system the participant projectile target ma sses are independent of centrality; so any dependence of the shape on centr ality must therefore be a dynamical effect. No dependence of the produced p article pseudorapidity distribution on multiplicity or centrality is seen. VENUS, the only one of the two models which attempts to incorporate reinter action phenomena, predicts a narrowing of the pseudorapidity distributions for the highest multiplicity events, which we do not observe. In general, F RITIOF produces better fits to the all-charged-particle (primarily pion) da ta than does VENUS.