Department Colloquium | Challenging the Standard Model with a new measurement of the muon magnetic moment anomaly g-2

The muon magnetic moment anomaly is a contribution to the magnetic moment that arises from interactions with the particles that briefly emerge from the quantum vacuum to affect the muon's interaction with a magnetic field. The muon g-2 experiment at Fermilab has collected six years of data, and on August 7, 2023, the collaboration announced the result from analyzing year two and three and the combined precision of 200 parts per-billion. In the Standard Model of particles and interactions, the muon g-2 is a radiative correction that can be calculated, in principle, with high precision. Our challenge to the Standard Model is the comparison of experiment and the theory. In this address, I will describe the experiment and the challenges overcome to achieve its precision with some emphasis on the University of Michigan contributions, and I will put the challenge to the Standard Model in context including the challenges of the Standard Model Calculation.