Observations of extremely rare subatomic particle actions have allowed scientists to put one of the most stringent limits yet on the reigning theory of particle physics.
Physicists at the world's largest particle accelerator, the Large Hadron Collider (LHC) in Geneva, Switzerland, have watched a type of particle called B mesons decay into other particles called muons — a very unusual occurrence. By measuring just how often this happens, the scientists can test predictions made by the Standard Model, the theory that governs the realm of these tiny particles.
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