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arXiv · 2105.11462

Leptonic anomalous magnetic moments in $\nu$SMEFT

Vincenzo Cirigliano·Wouter Dekens·Jordy de Vries·Kaori Fuyuto·Emanuele Mereghetti·Richard Ruiz
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Abstract

We investigate contributions to the anomalous magnetic moments of charged leptons in the neutrino-extended Standard Model Effective Field Theory ($\nu$SMEFT). We discuss how $\nu$SMEFT operators can contribute to a lepton's magnetic moment at one- and two-loop order. We show that only one operator can account for existing electronic and muonic discrepancies, assuming new physics appears above $1$ TeV. In particular, we find that a right-handed charged current in combination with minimal sterile-active mixing can explain the discrepancy for sterile neutrino masses of $\mathcal O(100)$ GeV while avoiding direct and indirect constraints. We discuss how searches for sterile neutrino production at the (HL-)LHC, measurements of $h\rightarrow \mu^+ \mu^-$ and searches for $h\rightarrow e^+ e^-$, neutrinoless double beta decay experiments, and improved unitarity tests of the CKM matrix can further probe the relevant parameter space.

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Vincenzo Cirigliano, Wouter Dekens, Jordy de Vries, Kaori Fuyuto, Emanuele Mereghetti, Richard Ruiz. 2021-05-24. Leptonic anomalous magnetic moments in $\nu$SMEFT. https://doi.org/10.1007/jhep08(2021)103

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