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He published results from CERN’s SPS accelerator which included the first observation in Europe of the J/psi particle, which consists of charmed quarks, supporting the theory that matter is composed of quarks. After research at the Hadron-Electron Ring Accelerator (HERA) at DESY in Hamburg, he helped develop detectors for the Large Hadron Collider (LHC) at Geneva and was involved in the ATLAS experiment which discovered the Higgs boson. He won the 1988 Rutherford Medal and Prize.