Effective field theory interpretation of lepton magnetic and electric dipole moments

Jason Aebischer (Department of Physics, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0319, USA) ; Wouter Dekens (Department of Physics, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0319, USA) ; Elizabeth Jenkins (Department of Physics, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0319, USA) ; Aneesh Manohar (Department of Physics, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0319, USA) ; Dipan Sengupta (Department of Physics, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0319, USA) ; et al. - Show all 6 authors

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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      "surname": "Sengupta", 
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Published on:
16 July 2021
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2021 (2021)
Issue 7
Pages 1-31
DOI:
https://doi.org/10.1007/JHEP07(2021)107
arXiv:
2102.08954
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: