Twenty years ago, in an experiment at Brookhaven National
Laboratory, physicists detected what seemed to be a discrepancy between
measurements of the muon’s magnetic moment and theoretical calculations of
what that measurement should be, raising the tantalizing possibility of
physical particles or forces as yet undiscovered. The Fermilab team has
just announced that their precise measurement supports this possibility.
The reported significance for new physics is 4.2 sigma just slightly below
the discovory level of 5 sigma. However, an extensive new calculation of
the muon's magnetic moment using lattice QCD by the BMW-collaboration
reduces the gap between theory and experimental measurements. The lattice
result appeared in Nature on the day of the Fermilab announcement. In this
talk both the theoretical and experimental aspects are summarized with two
possible narratives: a) almost discovery or b) Standard Model re-inforced.
Some details of the lattice caluculation are also shown.
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