  Among the probes used to investigate the properties of the Quark-Gluon
Plasma, the measurement of the energy loss of high-energy partons can be used
to put constraints on energy-loss models and to ultimately access medium
characteristics, such as the energy density or the temperature. The study of
two-particle correlations allows us to obtain very different constraints
compared to the nuclear modification factor. In particular, the correlation of
charged hadrons with high energy $\pi^{0}$ or direct photons is believed to
give a measurement of the parton energy loss and insights into the
medium-induced modification of the fragmentation process. High energy neutral
pions are reconstructed using the ALICE electromagnetic calorimeters EMCal and
PHOS, and the charged particles are detected by the main tracking detectors ITS
and TPC. In these proceedings, the measurement of neutral mesons at $\sqrt{s} =
$2.76 TeV in pp collisions are presented, as well as the measurements of
azimuthal $\pi^{0}$-hadron correlations in pp and Pb-Pb collisions at
$\sqrt{s_{\rm{NN}}} = 2.76$~TeV, and the extracted per-trigger yield
modification factor ($I_{AA}$). Comparisons with theoretical model calculations
are also added.
