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Semihard scattering unraveled from collective dynamics by two-pion azimuthal correlations in 158A GeV/c Pb+Au collisions |
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| Authors: | Agakichiev G Appelshäuser H Baur R Bielcikova J Braun-Munzinger P Cherlin A Drees A Esumi S I Filimonov K Fraenkel Z Fuchs Ch Glässel P Hering G Huovinen P Lenkeit B Marín A Messer F Messer M Milosevic J Mi?kowiec D Nix O Panebrattsev Yu Petrácek V Pfeiffer A Rak J Ravinovich I Razin S Rehak P Sako H Saveljic N Schmitz W Shimansky S Socol E Specht H J Stachel J Tilsner H Tserruya I Voigt C Voloshin S Weber C Wessels J P Wurm J P Yurevich V;CERES Collaboration |
| Institution: | Gesellschaft für Schwerionenforschung (GSI), 64291 Darmstadt, Germany. |
| Abstract: | Elliptic flow and two-particle azimuthal correlations of charged hadrons and high-p(T) pions (p(T)>1 GeV/c) have been measured close to midrapidity in 158A GeV/c Pb+Au collisions by the CERES experiment. Elliptic flow (v(2)) rises linearly with p(T) to a value of about 10% at 2 GeV/c. Beyond p(T) approximately 1.5 GeV/c, the slope decreases considerably, possibly indicating a saturation of v(2) at high p(T). Two-pion azimuthal anisotropies for p(T)>1.2 GeV/c exceed the elliptic flow values by about 60% in midcentral collisions. These nonflow contributions are attributed to nearside and back-to-back jetlike correlations, the latter exhibiting centrality dependent broadening. |
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