Semihard scattering unraveled from collective dynamics by two-pion azimuthal correlations in 158A GeV/c Pb + Au collisions

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/...

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Detalles Bibliográficos
Autores principales: Agakichiev, G, Appelshäuser, H, Baur, R, Bielcikova, J, Braun-Munzinger, P, Cherlin, A, Drees, A, Esumi, S I, Filimonov, K, Fraenkel, Zeev, Fuchs, C, Glässel, P, Hering, G, Huovinen, P, Lenkeit, B C, Marin, A, Messer, F, Messer, M, Milosevic, J, Miskowiec, D, Nix, O, Panebratsev, Yu A, Petracek, V, Pfeiffer, A, Rak, J, Ravinovich, I, Razin, S, Rehak, P, Sako, H, Saveljic, N, Schmitz, W, Shimansky, S S, Socol, E, Specht, H J, Stachel, J, Tilsner, H, Tserruya, Itzhak, Voigt, C A, Voloshin, S A, Weber, C, Wessels, J P, Wurm, J P, Yurevich, V
Lenguaje:eng
Publicado: 2004
Materias:
Nuclear Physics
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.92.032301
http://cds.cern.ch/record/802378
Descripción
Sumario: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} \approx $1.5 Ge V/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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