Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Heavy Ion Collisions and QCD Phases 4

HK 34.2: Vortrag

Dienstag, 24. März 2015, 17:30–17:45, T/HS1

Charged pion, kaon and proton production in pp and Pb-Pb collisions measured with ALICE — •Raul Tonatiuh Jimenez Bustamante for the ALICE collaboration — GSI Helmholtzzentrum für Schwerionenforschung, Physikalisches Institut, Universität Heidelberg

The ALICE detector at the CERN LHC has excellent Particle IDentification (PID) capabilities in the central barrel ( η < 0.9). This allows the production of pions, kaons and protons to be measured over a wide transverse momentum (p_T) range. The Inner Tracking System (ITS) and the Time Projection Chamber (TPC) measure the specific energy loss (dE/dx) of the particle, which provides track-by-track PID in the p_T range 0.1 to ≃ 1.0 GeV/c. The time of flight detector (TOF) contributes to PID for the p_T range between 0.5 GeV/c and 3-4 GeV/c, while a Ring Imaging Cherenkov Detector (HMPID) extends the identification of protons till p_T ≃ 6 GeV/c. High p_T particles (up to 20 GeV/c) are identified using the relativistic rise of the specific energy loss in the TPC.

Results on identified particle spectra and production yield ratios at mid-rapidity measured by ALICE in different colliding systems (pp, p-Pb and Pb-Pb) will be presented. The similarities among them and the comparisons to models will be discussed. For Pb-Pb collisions the nuclear modification factor as a function of p_T will be shown for different collision centralities.