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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Schwerionenkollisionen und QCD Phasen V

HK 40.5: Talk

Wednesday, March 23, 2011, 17:30–17:45, HS AP

Event-by-event fluctuations of mean transverse momentum in pp collisions at √s = 900 GeV and 7 TeV measured by the ALICE experiment — •Stefan Heckel — Goethe-Universität Frankfurt, Institut für Kernphysik, Max-von-Laue-Str. 1, 60438 Frankfurt am Main

Event-by-event fluctuations of the average transverse momentum p_T of particle production in heavy ion collisions have been proposed as a probe of phase instabilities near the QCD phase transition. Fluctuation measurements could also provide information about the onset of thermalisation in the system. The corresponding measurement of event-by-event fluctuations in pp collisions provides valuable information as a reference measurement for heavy ion collisions. The ALICE experiment at the CERN LHC has measured charged particle production in pp collisions at √s = 900 GeV and 7 TeV. We present first results on event-by-event fluctuations of p_T at these energies. Different approaches will be discussed. The dispersion of the average event transverse momentum D(p_T) and the two-particle p_T correlator ⟨ Δ p_T,i, Δ p_T,j ⟩ have been studied as a function of the event multiplicity.