The Breakthrough Prize in Fundamental Physics for 2026 has been awarded to researchers including a team at UCL who measured the magnetic “wobble” of the subatomic muon particle with ever greater precision. The prize recognised efforts to measure the anomalous magnetic moment (“g minus 2”, or g-2) of the muon over six decades, with the experiment beginning in Europe at CERN in the 1970s, shifting to Brookhaven National Laboratory in the United States in the 1990s and concluding at the US’s