A new era for the LHC and its experiments

The LHC restarted in 2015 with an energy in the center of mass increased by 60% to reach 13 TeV. This run-2 is an opportunity for the search of a new physics beyond the Standard Model through the detection of new particles and to understand the Higgs boson better. The production of a Higgs boson remains a rare event in collisions so the piling up of a large quantity of data is necessary to measure its properties. The ATLAS and CMS giant detectors have been upgraded. The volume of data represents several tera-octets of information per second which is impossible to record as a whole so the trigger systems have been modified to be able to analyse collisions in less than 3 μs and to select the most interesting ones. In winter 2016, ATLAS and CMS teams announced both an excess of 2 photons events corresponding to a mass of 750 GeV in the data recorded in end 2015. The analysis of 4 times more data in summer 2016 did not confirm this excess. (A.C.)