DOIAbstract
Towards the end of 2010, some 25 years after the very first collisions of ultra-relativistic heavy ions at fixed target energies, and some 10 years after the start of operation of the Relativistic Heavy Ion Collider (RHIC), the LHC opened a new era in heavy ion physics with lead on lead collisions at $\sqrt{s_{NN}} = 2.76$ TeV. After a short reminder of the main results from lower energies, this review highlights a few selected areas where significant progress has been made during the first three years of ion operation at the LHC
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