Aug 12 – 18, 2012
US/Eastern timezone

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Production of Charged Pions, Kaons, and Protons in 2.76 TeV Pb-Pb Collisions at high p_t measured with the ALICE Experiment.

Aug 16, 2012, 2:20 PM



Antonio Ortiz Velasquez (Lund University (SE))


The main tracking detector in the central barrel ($|\eta|<1$) of the ALICE experiment is the Time Projection Chamber. In addition to charged particle tracking it provides particle identification (PID) through the measurement of the specific energy loss, $dE/dx$. At low momentum ($p < 1$ GeV/c), pions, kaons, and protons can be cleanly separated. Thanks to the relativistic rise of the $dE/dx$, the relative yield of pions, kaons, and protons can also be extracted statistically at higher momenta, $p > 3$ GeV/c. In this talk, spectra for charged pions, kaons, and protons from pp collisions at $\sqrt{s} = 2.76$ TeV and Pb-Pb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV for $3 < p_{t} < 20$ GeV/c will be presented, and the nuclear modification factor $R_{AA}$ will be derived. The evolution of $R_{AA}$ with collision centrality and transverse momentum will be discussed, and compared to unidentified charged particles, $K_{s}^{0}$ , $\Lambda$, and theoretical predictions.

Primary author

Collaboration ALICE (CERN, Geneva, Switzerland)


Antonio Ortiz Velasquez (Lund University (SE))

Presentation materials

Peer reviewing