Centrality dependence of kaon yields in Si + A and Au + Au collisions at relativistic energies - art. no. 044904

Citation
L. Ahle et al., Centrality dependence of kaon yields in Si + A and Au + Au collisions at relativistic energies - art. no. 044904, PHYS REV C, 6004(4), 1999, pp. 4904
Citations number
32
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW C-NUCLEAR PHYSICS
ISSN journal
0556-2813 → ACNP
Volume
6004
Issue
4
Year of publication
1999
Database
ISI
SICI code
0556-2813(199910)6004:4<4904:CDOKYI>2.0.ZU;2-5
Abstract
Charged kaon production has been measured in Si+Al and Si+Au collisions at 14.6A GeV/c, and Au+Au collisions at 11.1A GeV/c by Experiments 859 and 866 (the E-802 Collaboration) at the BNL AGS. Invariant transverse mass spectr a and rapidity distributions for both K+ and K- are presented. The centrali ty dependence of rapidity-integrated kaon yields is studied. Strangeness en hancement is observed as an increase in the slope of the kaon yield with th e total number of participants as well as the yield per participant. The en hancement starts with peripheral Si+Al and Si+Au collisions (relative to NN) and appears to saturate for a moderate number of participating nucleons in Si+Au collisions. It is also observed to increase slowly with centrality in Au+Au collisions, to a level in the most central Au+Au collisions that is greater than that found in central Si+A collisions. The enhancement fact ors for K+ production are 3.0+/-0.2(stat)+/-0.4(syst) and 4.0+/-0.3(stat)+/ -0.5(syst), respectively, for the most central 7% Si+Au collisions and the most central 4% Au+Au collisions relative to N+N at the corresponding beam energy. [S0556-2813(99)01910-X].