Collider Anomaly
CERN's LHCb is watching B mesons decay — and the muon pairs they produce deviate from Standard Model predictions by 4 sigma, hinting at undiscovered physics. May 2026.
Collision events
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B⁰ mesons tagged
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Significance
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B mesons contain a 'beauty' (b) quark. When they decay through 'penguin' loop diagrams, the angular distribution of muon pairs reveals a 4σ excess over Standard Model predictions at CERN's LHCb, May 2026.
The penguin decay chain