Elliptic flow of {lambda} hyperons in Pb+Pb collisions at 158A GeV

Journal Article · Sun Apr 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.044901· OSTI ID:20995220

Alt, C; Blume, C; Bramm, R; Dinkelaker, P; Flierl, D; Kliemant, M; Kniege, S; Lungwitz, B; Mitrovski, M; Renfordt, R; Schuster, T; Stock, R; Strabel, C; Stroebele, H; Wetzler, A ^[1]; Anticic, T; Kadija, K; Nicolic, V; Susa, T ^[2]; Baatar, B ^[3]

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1. Fachbereich Physik der Universitaet, Frankfurt (Germany)
2. Rudjer Boskovic Institute, Zagreb (Croatia)
3. Joint Institute for Nuclear Research, Dubna (Russian Federation)

The elliptic flow of {lambda} hyperons has been measured by the NA49 Collaboration at the CERN-SPS in semicentral Pb+Pb collisions at 158A GeV. The standard method of correlating particles with the event plane was used. Measurements of v{sub 2} near midrapidity 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 v{sub 2} for pions and protons as well as with model calculations. The observation of significant elliptic flow and its mass dependence suggest strong collective behavior 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 p{sub T} range of the data does not allow for a decisive test of the coalescence model.

• OSTI ID: 20995220
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CERN SPS SYNCHROTRON
COLLISIONS
GEV RANGE 100-1000
HEAVY NUCLEI
HYPERONS
IMPACT PARAMETER
LEAD
PARTICLE RAPIDITY
PARTICLES
PIONS
PROTONS
TRANSVERSE MOMENTUM