‘The standard model is not dead’: ultra-precise particle measurement thrills physicists

Researchers at CERN have calculated the mass of a fundamental particle called the W boson: 80,360.2 million electronvolts. The result quashes suggestions of a problem with the ‘standard model’ — physicists’ best description of particles and forces — raised by a discrepancy between the measured W boson mass and what the standard model predicts that was reported in 2022.