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arXiv · 1806.10252

A Tale of Two Anomalies

Hooman Davoudiasl·William J. Marciano
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Abstract

A recent improved determination of the fine structure constant, $α= 1/137.035999046(27)$, leads to a $\sim 2.4 σ$ 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 $\sim 3.7 σ$ 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.

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Hooman Davoudiasl, William J. Marciano. 2018-10-17. A Tale of Two Anomalies. https://doi.org/10.1103/physrevd.98.075011

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