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<p>Following a proposal for an experiment with sensitivity to an electric dipole moment (EDM) of the muon <i>d</i><sub><i>μ</i></sub> of order 6 × 10<sup><i>−</i>23</sup> <i>e</i> 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 <i>d</i><sub><i>e</i></sub>, 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 <i>d</i><sub><i>μ</i></sub> 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 <i>d</i><sub><i>μ</i></sub> experiment. In case of VLLs, we also find measurements of Γ(<i>h</i> → <i>μμ</i>) offer competitive sensitivity, highlighting the complementary role of collider observables. Generically, the potential reach is to <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">O</mi> </math></EquationSource> <EquationSource Format="TEX">\( \mathcal{O} \)</EquationSource> </InlineEquation>(10 TeV) scale of new physics.</p>

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Chasing the muon EDM to constrain the SMEFT and UV models

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月5日

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  • Kuldeep Deka,
  • Marta Losada,
  • Yosef Nir

摘要

Following a proposal for an experiment with sensitivity to an electric dipole moment (EDM) of the muon dμ of order 6 × 10−23 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 de, 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 dμ 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 dμ experiment. In case of VLLs, we also find measurements of Γ(h → μμ) offer competitive sensitivity, highlighting the complementary role of collider observables. Generically, the potential reach is to O \( \mathcal{O} \) (10 TeV) scale of new physics.