Scalar leptoquark couplings are constrained by a comprehensive set of upper bounds from tau, muon, electron, and kaon decay data, including standard model interference in rare K to pi l+ l- modes.
A Tale of Two Anomalies
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abstract
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.
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Constraints on scalar leptoquarks from lepton and kaon physics
Scalar leptoquark couplings are constrained by a comprehensive set of upper bounds from tau, muon, electron, and kaon decay data, including standard model interference in rare K to pi l+ l- modes.