First Results from the Fermilab Muon g-2 Experiment!

One of the most promising ways of searching for evidence of physics beyond the standard model is through precision measurements of the so-called "g-factor" of the muon. Twenty years ago, the Brookhaven experiment that measured the muon’s anomalous magnetic moment a_μ = (g-2)/2 completed its data-taking campaign.  When the final analyses were published a few years later, the result differed by more than 2 standard deviations (σ) from the concurrent standard model (SM) prediction.  Alas, this felt like a rotten situation to be in, one that had to be resolved one way or the other.   A number of us formed a new collaboration to design and build an experiment capable of higher precision.  In the intervening years, the international theory community involved in predicting a_μ formed the Muon g-2 Theory Initiative, with the similar aim to reduce theoretical uncertainties.   Last year, following a Workshop held here at the INT, the theorists published a comprehensive Physics Report with a consensus value for a_μ. When compared to experiment, the difference swelled to 3.7 σ, an exciting yet still not definitive result.   Over the past 10 years, our new experiment has been built and we are steadily acquiring data. The University of Washington and CENPA have been central to the design, construction, commissioning, running, and analysis of this experiment since Day 1.  It is therefore my great pleasure and honor to represent our group and announce in this Colloquium the first results from our 2018 run.