
Starting from 3 June, the experiments at the Large Hadron Collider (LHC), including ALICE, are back in action, taking data for the accelerator’s second run.
ALICE (A Large Ion Collider Experiment), which studies quark-gluon plasma – the matter present in the first moments of the universe’s existence – has now improvements to most of its 19 subdetectors. One of these was the electromagnetic calorimeter, which measures the energy of the electrons, positrons and photons produced by the collisions.