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CERN's LHCb experiment finds evidence of a one-in-10-billion particle decay

Reported the 3.2-sigma B_d → μ+μ− evidence

On 3 November 2026, physicists on the LHCb experiment at CERN reported evidence that a particle called the B_d meson can decay into two muons. The Standard Model predicts this happens about once in every 10 billion beauty-particle decays. Combined with earlier data, the signal reached 3.2 sigma.

Updated 2 hours ago