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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Schwerionenkollisionen und QCD Phasen
HK 21.6: Vortrag
Dienstag, 20. März 2012, 18:00–18:15, P 5
Event-by-event mean pT fluctuations in pp and Pb–Pb collisions measured by the ALICE experiment at the LHC — •Stefan Heckel — Goethe-Universität Frankfurt, Institut für Kernphysik, Max-von-Laue-Str. 1, 60438 Frankfurt am Main
Non-statistical event-by-event fluctuations of the mean transverse momentum of charged particles in pp and Pb–Pb collisions are studied using the ALICE experiment at the LHC. The analysis is performed at |η| < 0.8 and 0.15 < pT < 2 GeV/c. Multiplicity dependent results are obtained for pp collisions at √s = 0.9, 2.76 and 7 TeV. Pb–Pb collisions at √sNN = 2.76 TeV are analysed in intervals of multiplicity and centrality, the latter in bins of 5%. Little collision energy dependence is observed in pp collisions. The data indicate a common scaling behaviour with event multiplicity from pp to semi-central Pb–Pb collisions. In central Pb–Pb collisions, the results deviate from this trend, exhibiting a significant reduction of the fluctuation strength. The results are compared to measurements in Au–Au collisions at lower collision energies and to Monte Carlo simulations with PYTHIA and HIJING.