The ATLAS Collaboration gathers close to 3,000 physicists, from 174 institutes in 38 countries. ATLAS is one of the two general-purpose experiments at the CERN Large Hadron Collider (LHC). ATLAS has recorded proton-proton collision data at 7 TeV center-of-mass energy in 2010 and 2011, then at 8 TeV in 2012 (Run 1). The Higgs boson discovery was announced at CERN in July 2012. The Run 2 of the LHC, which started in 2015 at 13 TeV energy, is on going until end of 2018.
The ATLAS group at IRFU has contributed to the design and construction of the muon spectrometer and the liquid Argon electromagnetic calorimeter. The group is active in data analysis: properties of the Higgs boson, tests of the Standard Model, and search for physics beyond the Standard Model. IRFU physicists are also involved in the upgrades of the ATLAS detector for the high-luminosity phases of the LHC, in particular they are building part of a novel forward muon detector known as NSW (New Small Wheels) and improving the trigger capabilities of the electromagnetic calorimeter.
The ATLAS SPP group gathers 19 physicists, 1 post-doc researcher and 9 PhD students. The group leader is Claude Guyot.