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HK: Physik der Hadronen und Kerne
HK 33: Heavy Ions IV
HK 33.4: Talk
Wednesday, March 13, 2002, 14:45–15:00, E
Directed and elliptic flow in Pb+Pb collisions at 40 A GeV* — •Alexander Wetzler1, Latchezar Betev1, Christoph Blume2, Nicolas Borghini3, Roland Bramm1, Predrag Buncic1, Phuong Mai Dinh4, Peter Dinkelaker1, Marek Gaździcki1, Thorsten Kollegger1, Ingrid Kraus2, André Mischke2, Jean-Yves Ollitrault4, Art Poskanzer5, Rainer Renfordt1, Andres Sandoval2, Reinhard Stock1, Herbert Ströbele1, Danilo Vranic2, and Jacek Zaranek1 — 1Institut für Kernphysik, Universität Frankfurt — 2Gesellschaft für Schwerionenforschung, Darmstadt — 3Université Libre de Bruxelles — 4CEA-Sacclay, Gif-sur-Yvette — 5Lawrence Berkeley Laboratory, Berkeley California
Azimuthal distributions of pions and protons have been measured by the NA49 experiment in Pb+Pb collisions at 40 A GeV over a wide range in rapidity and tranverse momentum. Analyses in terms of first and second order Fourrier coefficients [1] and by the cumulant method [2] yield consistent results for the values of directed (v1) and elliptic (v2) flow. At 40 A GeV beam energy we obtain values of v1 and v2 averaged over rapidity and transverse momentum. These results are compared to the corresponding values at 158 A GeV.
[1] A. M. Poskanzer, S.A. Voloshin, Phys. rev. C58,1671(1998); S.A. Voloshin, A.M. Poskanzer, Phys. Lett. B474(2000)27 [2] N. Borghini, P.M. Dinh, J-Y. Ollitrault, Phys. rev. C64(2001)054901
(*) gefördert von BMBF und GSI