Theoretical value of muon g-2 updated

Fermilab E989 experiment

This is a follow-up on my post titled “Muon g-2 mystery“.

FERMILAB announcement on June 11, 2020:

FERMILAB announced that the latest consensus theoretical value of the anomalous magnetic moment of the muon (published on June 8, 2020) is:

(g-2)/2 (muon, theory) = 116 591 810(43) x 10-12

compare it to the experimental value obtained by the E821 collaboration at the BNL (Brookhaven National Laboratory) in 2001.

(g-2)/2 (muon, expmt) = 116 592 089(63) x 10-12

The statistical significance of the difference is 3.7 sigma.

The final report of E821 was published in 2006.

In the upcoming months, physicists working on the Fermilab E989 experiment will unveil their preliminary measurement for the value. Fermilab E989 experiment will measure muon’s magnetic moment to a precision of 140 parts per billion. This will be a factor of 4 improvement over BNL E821 experiment’s precision.

Based on the Fermilab E989 results, if the statistical significance of the difference between the theoretical value and the measured value exceeds 5 sigma we will have clear indication of new physics beyond the Standard Model of particle physics.

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