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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Schwerionenkollisionen und QCD Phasen

HK 12.2: Talk

Monday, March 17, 2014, 17:00–17:15, HZ 6

Transverse Momentum Spectra of Unidentified Charged Particles in pp, p–Pb and Pb–Pb Collisions with ALICE — •Philipp Lüttig for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt

To study the properties of matter created in p–Pb and Pb–Pb collisions, a common observable is the nuclear modification factor as function of the transverse momentum (p_T) of charged particles. The ALICE detector at the CERN-LHC has accumulated a wealth of data on pp, p–Pb and Pb–Pb collisions in the past years. Using a combined tracking approach based on information in the Inner Tracking System (ITS) and the Time Projection Chamber (TPC) ALICE is capable to measure the transverse momentum in a broad p_T range up to p_T = 50 GeV/c in these collision systems.
For the calculation of the nuclear modification factor, pp reference spectra are needed. In this talk, the extraction of the pp baseline spectra for p–Pb and Pb–Pb collisions for charged particles is discussed. The nuclear modification factor measured in Pb–Pb collisions will be presented.
Based on the same tracking approach, ALICE can measure the transverse momentum of charged particles down to p_T = 150 MeV/c, which is crucial for the measurement of the average transverse momentum. A systematic study of the system-size and collision energy dependence of the average transverse momentum and its correlation to charged particle multiplicity will be presented.
Supported by BMBF and the Helmholtz Association.