The production of , and vector-mesons by protons and sulphur ions with incident momentum of 200 GeV/c per nucleon
The production of , and vector-mesons, detected through their decay channel, is studied in p-W, S-S, S-Cu and S-U reactions at 200 GeV/c per nucleon incident momentum. Their inclusive cross-sections are determined in various transverse momentum intervals and their dependence on the projectile and target mass numbers is investigated. The relative yield is measured, both as a function of the transverse momentum, p T , and of the collision centrality. While this ratio exhibits no significant dependence with p T , it clearly increases with the centrality of the collision. Effective temperatures deduced from the transverse mass spectra, , lead to values of equal or slightly higher than . Both these effective temperatures smoothly increase from p-W to S-U reactions.
© Springer-Verlag, 2005