  The ALICE experiment at LHC studies the strong interaction sector of the
Standard Model with pp, pA and AA collisions. Within the scope of the physics
program, measurements of photons, neutral mesons and jets in ALICE are
performed by two electromagnetic calorimeters. Precise and high-granularity
photon spectrometer (PHOS) composed of lead-tungstate crystals, along with a
wide-aperture lead-scintillator sampling calorimeter (EMCal) provide
complementary measurements of photon observables in a wide kinematic range. The
calorimeter trigger system allows the experiment to utilize efficiently the
full delivered luminosity, recording a data sample enhanced with high-energy
photons and jets. Performance of the ALICE calorimeters from proton-proton to
heavy-ion collision systems is discussed and illustrated by physics results
derived from data collected by ALICE with its electromagnetic calorimeter
system.
