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arXiv · 2102.08954

Effective field theory interpretation of lepton magnetic and electric dipole moments

Jason Aebischer·Wouter Dekens·Elizabeth E. Jenkins·Aneesh V. Manohar·Dipan Sengupta·Peter Stoffer
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Abstract

We perform a model-independent analysis of the magnetic and electric dipole moments of the muon and electron. We give expressions for the dipole moments in terms of operator coefficients of the low-energy effective field theory (LEFT) and the Standard Model effective field theory (SMEFT). We use one-loop renormalization group improved perturbation theory, including the one-loop matching from SMEFT onto LEFT, and one-loop lepton matrix elements of the effective-theory operators. Semileptonic four-fermion operators involving light quarks give sizable non-perturbative contributions to the dipole moments, which are included in our analysis. We find that only a very limited set of the SMEFT operators is able to generate the current deviation of the magnetic moment of the muon from its Standard Model expectation.

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Jason Aebischer, Wouter Dekens, Elizabeth E. Jenkins, Aneesh V. Manohar, Dipan Sengupta, Peter Stoffer. 2021-02-17. Effective field theory interpretation of lepton magnetic and electric dipole moments. https://doi.org/10.1007/jhep07(2021)107

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