Berlin 2005 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HK: Physik der Hadronen und Kerne

HK 39: Physik mit schweren Ionen

HK 39.7: Vortrag

Mittwoch, 9. März 2005, 15:45–16:00, TU MA144

Λ Elliptic Flow in Pb+Au Collisions at 158 GeV — •Jovan Milošević — Universität Heidelberg, Germany

We present Λ elliptic flow (v₂) measurement from Pb+Au collisions at the highest SPS energy. This is the first elliptic flow measurement of Λ particles below RHIC energies. The data were collected by the CERES experiment which covers narrow mid-rapidity region, but it has full (2π) azimuthal coverage and wide p_T range up to 3.5 GeV/c. This measurement, in particular in comparision to pion elliptic flow, could tests hydrodinamical models and the equation of state used. The value of v₂ as a function of rapidity and transverse momentum of Λ particle is presented, as well as of collision centrality. A non-uniform rapidity dependence of v₂ is a consequence of Λ acceptance. v₂ grows with p_T. Up to ≈ 1.3 GeV/c it is comparable with v₂ values observed with STAR at RHIC, but above it is significantly smaller. Λ elliptic flow also shows a typical centrality dependence. Our measurement is compared with hydrodynamical model calculations.