Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2011-09-22
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 4 figures, proceedings of QM 2011
Scientific paper
The ALICE collaboration at the LHC has measured the transverse momentum spectra of neutral pions via their two photon decay in pp and Pb$-$Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV over a broad transverse momentum range with different subsystems: with the electromagnetic calorimeters PHOS and EMCAL and with photon conversions in the inner material of the detectors using $e^{+}e^{-}$ pairs reconstructed with the Central Tracking System. In this report, neutral pions production is compared between pp and Pb$-$Pb collisions measured with conversion photons in terms of the nuclear modification factor, $R_{AA}$, for different centrality selections of the Pb$-$Pb data sample.
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