From CERN press release dated 24 March 2019: Today, CERN welcomes Serbia as its 23rd Member State, following receipt of formal notification from UNESCO that Serbia has acceded to the CERN Convention. When Serbia was a part of Yugoslavia, which was one of the 12 founding Member States of CERN in 1954, Serbian physicists and engineers took part in some of CERN’s earliest projects, at the SC, PS and SPS facilities. In the 1980s and 1990s, physicists from Serbia worked on the DELPHI experiment at CERN’s LEP collider. In 2001, CERN and Serbia concluded an International Cooperation Agreement, leading to Serbia’s participation in the ATLAS and CMS experiments at the Large Hadron Collider, in the Worldwide LHC Computing Grid, as well as in the ACE and NA61 experiments. Serbia’s main involvement with CERN today is in the ATLAS and CMS experiments, in the ISOLDE facility, which carries out research ranging from nuclear physics to astrophysics, and on design studies for future particle colliders – FCC and CLIC – both of which are potentially new flagship projects at CERN. Read the press release here.