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2018

A Tale of Two Anomalies

Davoudiasl, Hooman, Marciano, William J.

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A recent improved determination of the fine structure constant, $\alpha= 1/137.035999046(27)$, leads to a $\sim 2.4 \sigma$ negative discrepancy between the measured electron anomalous magnetic moment and the Standard Model prediction.

That situation is to be compared with the muon anomalous magnetic moment where a positive $\sim 3.7 \sigma$ discrepancy has existed for some time.
A single scalar solution to both anomalies is shown to be possible if the two-loop electron Barr-Zee diagrams dominate the scalar one-loop electron anomaly effect and the scalar couplings to the electron and two photons are relatively large.
We also briefly discuss the implications of that scenario.

A Tale of Two Anomalies · Around

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