Chasing the muon EDM to constrain the SMEFT and UV models
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| Format: | Preprint |
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2025
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| _version_ | 1866909928080277504 |
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| author | Deka, Kuldeep Losada, Marta Nir, Yosef |
| author_facet | Deka, Kuldeep Losada, Marta Nir, Yosef |
| contents | Following a proposal for an experiment with sensitivity to an electric dipole moment (EDM) of the muon $d_μ$ of order $6\times10^{-23}\ e$ cm, three to four orders of magnitude below the current bound, but still seven orders of magnitude above the current bound on the EDM of the electron $d_e$, we explore the discovery potential of such an experiment. Within the dimension-six CP violating operators of the Standard Model effective field theory (SMEFT), we identify two dipole operators where $d_μ$ has the strongest sensitivity, and four classes of four-fermion operators where it has the best sensitivity for regions of parameter space that are far from minimal flavor violation. We further consider three UV completions: vector-like leptons (VLLs), heavy vector boson with off-diagonal leptonic couplings, and two Higgs doublet model. For each, we identify the region in parameter space that will be uniquely explored by the proposed $d_μ$ experiment. In case of VLLs, we also find measurements of $Γ(h \rightarrow μμ)$ offer competitive sensitivity, highlighting the complementary role of collider observables. Generically, the potential reach is to ${\cal O}(10\ {\rm TeV})$ scale of new physics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_21828 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Chasing the muon EDM to constrain the SMEFT and UV models Deka, Kuldeep Losada, Marta Nir, Yosef High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Theory Following a proposal for an experiment with sensitivity to an electric dipole moment (EDM) of the muon $d_μ$ of order $6\times10^{-23}\ e$ cm, three to four orders of magnitude below the current bound, but still seven orders of magnitude above the current bound on the EDM of the electron $d_e$, we explore the discovery potential of such an experiment. Within the dimension-six CP violating operators of the Standard Model effective field theory (SMEFT), we identify two dipole operators where $d_μ$ has the strongest sensitivity, and four classes of four-fermion operators where it has the best sensitivity for regions of parameter space that are far from minimal flavor violation. We further consider three UV completions: vector-like leptons (VLLs), heavy vector boson with off-diagonal leptonic couplings, and two Higgs doublet model. For each, we identify the region in parameter space that will be uniquely explored by the proposed $d_μ$ experiment. In case of VLLs, we also find measurements of $Γ(h \rightarrow μμ)$ offer competitive sensitivity, highlighting the complementary role of collider observables. Generically, the potential reach is to ${\cal O}(10\ {\rm TeV})$ scale of new physics. |
| title | Chasing the muon EDM to constrain the SMEFT and UV models |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Theory |
| url | https://arxiv.org/abs/2511.21828 |