Event-by-event fluctuations of the mean transverse momentum in 40, 80, and 158 A GeV/c Pb-Au collisions

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Measurements of event-by-event fluctuations of the mean transverse momentum in Pb-Au collisions at 40, 80, and 158 A GeV/c are presented. A significant excess of mean p_T fluctuations at mid-rapidity is observed over the expectation from statistically independent particle emission. The results are s...

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Detalles Bibliográficos
Autores principales: Adamova, D, Agakichiev, G, Appelshäuser, H, Belaga, V V, Braun-Munzinger, P, Campagnolo, R, Castillo, A, Cherlin, A, Damjanovic, S, Dietel, T, Dietrich, L, Drees, A, Esumi, S, Filimonov, K, Fomenko, K, Fraenkel, Zeev, Garabatos, C, Glässel, P, Hering, G, Holeczek, J, Kushpil, V, Lenkeit, B C, Ludolphs, W, Maas, A, Marin, A, Milosevic, J, Milov, A, Miskowiec, D, Musa, L, Panebratsev, Yu A, Petchenova, O Yu, Petracek, V, Pfeiffer, A, Rak, J, Ravinovich, I, Rehak, P, Richter, M, Sako, H, Schmitz, W, Schükraft, Jürgen, Sedykh, S, Seipp, W, Sharma, A, Shimansky, S S, Slivova, J, Specht, H J, Stachel, J, Sumbera, M, Tilsner, H, Tserruya, Itzhak, Wessels, J P, Wienold, T, Windelband, B, Wurm, J P, Xie, W, Yurevich, S, Yurevich, V I
Lenguaje:eng
Publicado: 2003
Materias:
Nuclear Physics - Experiment
Acceso en línea:http://cds.cern.ch/record/615423
Descripción
Sumario:Measurements of event-by-event fluctuations of the mean transverse momentum in Pb-Au collisions at 40, 80, and 158 A GeV/c are presented. A significant excess of mean p_T fluctuations at mid-rapidity is observed over the expectation from statistically independent particle emission. The results are somewhat smaller than recent measurements at RHIC. A possible non-monotonic behaviour of the mean p_T fluctuations as function of collision energy, which may have indicated that the system has passed the critical point of the QCD phase diagram in the range of mu_B under investigation, has not been observed. The centrality dependence of mean p_T fluctuations in Pb-Au is consistent with an extrapolation from pp collisions assuming that the non-statistical fluctuations scale with multiplicity. The results are compared to calculations by the RQMD and UrQMD event generators.

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