Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 26: Schwerionenkollisionen und QCD Phasen
HK 26.6: Vortrag
Dienstag, 18. März 2014, 18:00–18:15, HZ 6
Probing the QCD matter close to the phase transition with net-particle fluctuations measured by ALICE at the LHC — •Jochen Thäder for the ALICE collaboration — Research Division and ExtreMe Matter Institute, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt — Institut für Kernphysik, Technische Universität Darmstadt, Schlossgrabenstr. 9, 64289 Darmstadt
An event-by-event asymmetry in the number of particles and anti-particles produced at mid-rapidity in heavy-ion collisions can be related to fluctuations of the conserved quantities such as baryon number or charge in the strongly coupled quark-gluon plasma. Lattice calculations suggest that higher moments of the net-proton and the net-charge distributions are sensitive to the thermodynamic susceptibilities of the system.
The status of the event-by-event net-proton distribution and its higher moments measurement, taking the reconstruction efficiency into account, will be presented for Pb-Pb collisions at √sNN = 2.76 TeV using the tracking and particle identification of the Time Projection Chamber of the ALICE apparatus at the LHC. Different methods will be compared and limits arising for the experimental data will be shown. Furthermore, results from net-charge fluctuations measured by the ALICE collaboration, their higher moments, and a comparison to the theoretical predictions will be presented.