Speaker
Antonio Ortiz Velasquez
(Lund University (SE))
Description
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)
Co-author
Antonio Ortiz Velasquez
(Lund University (SE))
Peer reviewing
Paper
Paper files:
