Mainz 2012 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 37: Schwerionenkollisionen und QCD Phasen
HK 37.9: Talk
Wednesday, March 21, 2012, 18:45–19:00, P 5
Mean Transverse Momentum in pp and Pb-Pb Collisions with ALICE — •Marco Marquard — Institut für Kernphysik, Universität Frankfurt am Main, Germany
The ALICE experiment at the CERN-LHC has been designed to investigate the properties of the Quark-Gluon Plasma (QGP), a state of matter produced in central Pb-Pb collisions. The combined tracking of the two innermost detector systems (ITS and TPC) provides the possibility to measure the transverse momentum ( pT ) distribution of unidentified charged particles over a wide pT range, down to pT = 150 MeV/c. A characteristic quantity to describe the pT spectra is the mean transverse momentum (⟨pT ⟩). It has been suggested that a phase transition to the QGP may lead to a modified ⟨pT ⟩ dependence on the particle multiplicity in pp and Pb-Pb.
In this talk we discuss the ⟨pT ⟩ evolution with multiplicity and centrality of the collisions. Furthermore ⟨pT ⟩ in Pb-Pb collisions is compared to ⟨pT ⟩ in pp at the same center-of-mass energy.