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27 April 2024

» pubmed » pmid14753865

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Semihard scattering unraveled from collective dynamics by two-pion azimuthal correlations in 158A GeV/c Pb+Au collisions
G Agakichiev ; H Appelshäuser ; R Baur ; J Bielcikova ; P Braun-Munzinger ; A Cherlin ; A Drees ; S I Esumi ; K Filimonov ; Z Fraenkel ; Ch Fuchs ; P Glässel ; G Hering ; P Huovinen ; B Lenkeit ; A Marín ; F Messer ; M Messer ; J Milosevic ; D Mi?kowiec ; O Nix ; Yu Panebrattsev ; V Petrácek ; A Pfeiffer ; J Rak ; I Ravinovich ; S Razin ; P Rehak ; H Sako ; N Saveljic ; W Schmitz ; S Shimansky ; E Socol ; H J Specht ; J Stachel ; H Tilsner ; I Tserruya ; C Voigt ; S Voloshin ; C Weber ; J P Wessels ; J P Wurm ; V Yurevich ; ;
Date:	23 Jan 2004
Journal:	Phys Rev Lett, 92 (3), 032301
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.
Source:	PubMed, pmid14753865
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