  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.

High Energy Physics - Experiment