Elliptic flow of Lambda hyperons in Pb+Pb collisions at 158A GeV

Abstract

The elliptic flow of Lambda hyperons has been measured by the NA49 collaboration at the CERN-SPS in semi-central Pb+Pb collisions at 158A GeV. The standard method of correlating particles with the event plane was used. Measurements of v2 near mid-rapidity are reported as a function of rapidity, centrality and transverse momentum. Elliptic flow of Lambda particles increases both with the impact parameter and with the transverse momentum. It is compared with v2 for pions and protons as well as with model calculations. The observation of significant elliptic flow and its mass dependence suggest strong collective behaviour of the matter produced in collisions of heavy nuclei already at the SPS. Scaling properties of elliptic flow of different particle species have been tested at 158A GeV. The limited pT range of the data does not allow for a decisive test of the coalescence model.

6 pages, 6 figures, submitted to Physical Review C

References in corpus (3)

• Multi-strange baryon elliptic flow in Au+Au collisions at sqrt(s_NN)= 200 GeV
• Anisotropy of flow and the order of phase transition in relativistic heavy ion collisions
• Rapidity dependence of Bose-Einstein correlations at SPS energies

Cited by in corpus (7)

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• Cosmic clocks, cosmic variance and cosmic averages
• Strangeness enhancements at central rapidity in 40 A GeV/c Pb-Pb collisions
• Hadron production by quark combination in central Pb+Pb collisions at $\sqrt{s_{NN}}=17.3$ GeV
• Elliptic Flow in Heavy-Ion Collisions at Energies $\sqrt{s_{NN}}=$ 2.7--39 GeV
• Event-by-event charged-neutral fluctuations in Pb+Pb collisions at 158 A~GeV
• Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy