Production of phi-mesons in p + p, p + Pb and central Pb + Pb collisions at E-beam=158 A GeV

Citation
Sv. Afanasiev et al., Production of phi-mesons in p + p, p + Pb and central Pb + Pb collisions at E-beam=158 A GeV, PHYS LETT B, 491(1-2), 2000, pp. 59-66
Citations number
32
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS LETTERS B
ISSN journal
0370-2693 → ACNP
Volume
491
Issue
1-2
Year of publication
2000
Pages
59 - 66
Database
ISI
SICI code
0370-2693(20001012)491:1-2<59:POPIP+>2.0.ZU;2-W
Abstract
Yields and phase space distributions of phi -mesons emitted from p + p (min imum bias trigger), p + Pb (at various centralities) and central Pb + Pb co llisions are reported (E-beam = 158 A GeV). The decay phi --> K+K- was used for identification. The phi/pi ratio is found to increase by a factor of 3 .0 +/- 0.7 from inelastic p + p to central Pb + Pb. Significant enhancement in this ratio is also observed in subclasses of p + p events (characterize d by high charged-particle multiplicity) as well as in the forward hemisphe re of central p + Pb collisions. In Pb + Pb no shift or significant broaden ing of the phi -peak is seen. (C) 2000 Published by Elsevier Science B.V.