Enhancement of hyperon production at central rapidity in 158<i>A</i>GeV/<i>c</i>Pb–Pb collisionsF. Antinori, P A Bacon, A. Badalà et al.|Journal of Physics G Nuclear and Particle Physics|2006 Results are presented on hyperon and antihyperon production in Pb-Pb, pPb and pBe collisions at 158 GeV/c per nucleon. Lambda, Xi and Omega yields have been measured at central rapidity and medium transverse momentum as functions of the centrality of the collision. Comparing the yields in Pb-Pb to those in pBe interactions, strangeness enhancement is observed. The enhancement increases with the centrality and with the strangeness content of the hyperons, reaching a factor of about 20 for the Omega in the central Pb-Pb collisions.
Rapidity dependent strangeness measurements in BRAHMS experiment at RHICJ. H. Lee, I. G. Bearden, D. Beavis et al.|Journal of Physics G Nuclear and Particle Physics|2003 Particle production of charged kaons in central Au+Au collisions at has been studied as a function of rapidity by the BRAHMS collaboration at RHIC. The kaon spectral shapes are described well by an exponential in transverse mass for the rapidity range of 0 ⩽ yK ⩽ 3.3 with smoothly decreasing inverse slopes as the rapidity increases. For the charged kaon to pion ratios, while there is no significant rapidity dependence for the K+/π+ ratio, the K−/π− ratio shows a significant decrease from y ≈ 1 towards higher rapidities. The systematics of K−/K+ and ratios in the measured rapidity range demonstrates a strongly correlated behaviour which can be described by thermal–statistical models.