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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Schwerionenkollisionen und QCD Phasen

HK 60.1: Vortrag

Freitag, 23. März 2012, 11:00–11:15, P 5

Transverse Momentum Spectra of Unidentified Charged Particles in pp Collisions at the ALICE Experiment — •Philipp Lüttig — Institut für Kernphysik, Goethe University Frankfurt, Germany

The ALICE experiment at the CERN-LHC has accumulated a wealth of data on pp and Pb–Pb collisions in the past two years. Designed for exploring the properties of hot and dense matter formed in heavy-ion-collisions, the ALICE Time Projection Chamber (TPC) has the capability to measure the transverse momentum (p_T) of charged particles in a broad p_T range for p_T > 150 MeV/c.
In this talk the transverse momentum spectra of unidentified charged particles for pp collisions at √s= 0.9, 2.76 and 7 TeV are presented. The extraction of a pp baseline for the calculation of the nuclear modification factor R_AA at √s= 2.76 TeV is discussed and compared to alternative approaches to construct a baseline. In addition, the dependence of the average transverse momentum of these spectra on center-of-mass energy and multiplicity is reviewed and compared to measurements by other experiments.