The Muon g-2

Understand

The muon anomalous magnetic moment is one of the most precisely measured quantities in particle physics.

• In a recent experiment at Brookhaven it has been measured with a remarkable 14-fold improvement of the previous CERN experiment reaching a precision of 0.54ppm.
• Since the first results were published, a persisting "discrepancy" between theory and experiment of about 3 standard deviations is observed.
• It is the largest "established" deviation from the Standard Model seen in a "clean" electroweak observable and thus could be a hint for New Physics to be around the corner.