Seminar: ‘The Muon Magnetic Moment Mystery: a 20-year puzzle in high-energy physics’

Speaker: Zoltan Fodor (Penn State U.)

Venue & Time: Red Room / 15:00

Title: The Muon Magnetic Moment Mystery: a 20-year puzzle in high-energy physics

Abstract:

In the last two decades or so there have been stronger and stronger disagreements between direct measurements of the anomalous magnetic moment of the muon and the standard-model prediction. Such a large discrepancy would be a signal for an interaction or particle not present in the standard model. However, already in 2020 a lattice QCD calculation suggested a “no-tension” scenario. I report on our new lattice QCD calculation, which reduced the uncertainty of our 2020 result by about 40%. The agreement between the measured value of the anomalous magnetic moment of the muon and its theoretical predictions is an extremely impressive prove of the validity of quantum field theory –with three very different calculational frameworks for QED, EW and QCD– up to 11 digits.