ar X iv : n uc l - th / 0 20 60 46 v 1 1 9 Ju n 20 02 Anisotropic flow of strange particles in heavy ion collisions at RHIC energies
چکیده
Anisotropic flow of K's, K's, and Λ's is studied in heavy ion collisions at SPS and RHIC energies within the microscopic quark-gluon string model. At SPS energy the directed flow of kaons differs considerably at midrapidity from that of antikaons, while at RHIC energy kaon and antikaon flows coincide. The change is attributed to formation of dense meson-dominated matter at RHIC, where the differences in interaction cross-sections of hadrons become unimportant. The directed flows of strange particles, v (y), have universal negative slope at |y| ≤ 2 at RHIC. The elliptic flow of strange hadrons is developed at midrapidity at times 3 ≤ t ≤ 10 fm/c. It increases almost linearly with rising pt and stops to rise at pt ≥ 1.5 GeV/c reaching the same saturation value v K,Λ 2 (pt) ≈ 10% in accord with experimental results.