From Back Reaction, June 13, 2019: The so-called muon g-2 anomaly is a tension between experimental measurement and theoretical prediction. The most recent experimental data comes from a 2006 experiment at Brookhaven National Lab. A new experiment is now following up on the 2006 result: The Muon g-2 experiment at Fermilab.
Muon g-2 has begun its second run to search for hidden particles and forces. Muon g-2 collaborators have performed upgrades to improve the experiment’s precision and increase the amount of data it generates. As the experiment starts up again, scientists expect to make the world’s most precise measurement of the muon’s anomalous magnetic moment, which could tell us whether additional, undiscovered particles exist in the universe.
From Forbes, Sept. 8 2018: What will measurements of the constant ‘g’ — the ‘g’ in Muon g-2 — tell us about the universe?
From Frontline, July 19, 2018: The Indian magazine gives an overview of the Muon g-2 experiment.
From Gizmodo, July 3, 2018: The Muon g-2 experiment is slated to release new data about the muon magnetic moment as early as next year, which will inform physicists as to whether there are strange, undiscovered particles out there — or not.
From Argonne National Laboratory, April 19, 2018: Scientists from Argonne National Laboratory and Fermi National Accelerator Laboratory, along with collaborators from over 25 other institutions, are recreating a previous experiment with much higher precision.