München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 46: Physik mit schweren Ionen

HK 46.4: Vortrag

Donnerstag, 23. März 2006, 14:45–15:00, D

Strange and Charged Particle Elliptic Flow in Pb+Au Collisions at 158 AGeV/c — •Jovan Milosevic — Physikalisches Institut, Philosophenweg 12, 69120 Heidelberg

We present Λ, K_S⁰, π^± and proton elliptic flow measurements from Pb+Au collisions at the highest SPS energy. The data, collected by the CERES experiment which covers η=2.05−2.70 with full azimuthal acceptance and p_T sensitivity up to 4 GeV/c, can be used to test hydrodynamical models and show sensitivity to the EoS. The value of v₂ as a function of centrality and p_T is presented for different particle species. Our measurements are compared to results from other SPS experiments and to hydrodynamical calculations as well as with v₂ values observed with STAR at RHIC. In order to get better insight into the origin of the collective flow we performed scaling to the number of the constituent quarks and the transverse rapidity y_T^fs scaling predicted by hydrodynamics. Testing the differential flow measurements of different particle species against different scaling scenarios may yield additional information about the origin of flow.