From Anomaly to Agreement: Did we Close the Door on New Physics?

by Zoltan Fodor (Wuppertal University)

Monday 2 Nov 2026, 14:30 → 16:30 Europe/Rome

U5-5017 (Building U2 - Quantum)

In the last 20 years, there have been ever-increasing disagreements between direct measurements of the magnetic moment of the muon and its theoretical prediction. Such a large discrepancy was considered to be the strongest signal for an interaction or particle not present in our physical picture. I report on our lattice QCD calculation, and about the 60 years of struggle to calculate the magnetic moment's least precise contribution. The newly reached agreement between the measured value of the magnetic moment of the muon and its theoretical predictions is probably the best proof of the validity of quantum field theory—with three very different calculational frameworks for QED, EW, and QCD—up to 11 digits.

milano26.pdf