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The Muon g-2 Collaboration has doubled the precision of their 2021 measurement of the muon’s magnetic moment, strengthening a tension with predictions based on the standard model.

Physics picks its favorite stories from 2021.

Muon’s Escalating Challenge to the Standard Model April 7, 2021• Physics 14, 54 Measurements of the muon magnetic moment strengthen a previously reported tension with theoretical predictions, ushering in a new era of precision tests of the standard model. Reidar Hahn/Fermilab g − 2 ring, where the precession of muons in a magnetic field is used to measure the muon magnetic moment. Reidar Hahn/Fermilab g − 2 ring, where the precession of muons in a magnetic field is used to measu...

Physics 14, 47 Jorge Cham, aka, PHD Comics, illustrates the excitement over the muon anomaly results in a set of cartoons he made for Physics. April 7, 2021 To precisely measure the magnetic moment of the muon, physicists first needed to precisely measure the field produced by the 680-ton magnet that guides the muons. Read More » Particles and Fields April 7, 2021 Measurements of the muon magnetic moment strengthen a previously reported tension with theoretical predictions, ushering in a ne...

Measuring the Magnet that Measures the Muon April 7, 2021• Physics 14, 53 To precisely measure the magnetic moment of the muon, physicists first needed to precisely measure the field produced by the 680-ton magnet that guides the muons. Argonne National Laboratory Image of the trolley carrying the nuclear magnetic resonance probes used to measure the magnetic field in the Muon g Argonne National Laboratory Image of the trolley carrying the nuclear magnetic resonance probes used to ...