Experimental constraints on the coupling of the Higgs boson to electrons

Abstract

In the standard model (SM), the coupling of the Higgs boson to electrons is real and very small, proportional to the electron mass. New physics could significantly modify both real and imaginary parts of this coupling. We discuss experiments which are sensitive to the Higgs-electron coupling and derive the current bounds on new physics contributing to this coupling. The strongest constraint follows from the ACME bound on the electron electric dipole moment (EDM). We calculate the full analytic two-loop result for the electron EDM and show that it bounds the imaginary part of the Higgs-electron coupling to be less than 1.7 x 10^-2 times the SM electron Yukawa coupling. Deviations of the real part are much less constrained. We discuss bounds from Higgs decays, resonant Higgs production at electron colliders, Higgs mediated B -> e^+ e^- decays, and the anomalous magnetic moment of the electron. Currently, the strongest constraint comes from h -> e^+ e^- at the LHC, bounding the coupling to be less than ~600 times the SM Yukawa coupling. Important improvements can be expected from future EDM measurements as well as from resonant Higgs production at a next-generation high-luminosity e^+ e^- collider.

21 pages, 5 figures

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• Muon and Electron $(g-2)$ Anomalies with Non-Holomorphic Interactions in MSSM
• Global Constraints on Yukawa Operators in the Standard Model Effective Theory
• ISR corrections to associated $HZ$ production at future Higgs factories
• New Physics in Double Higgs Production at Future $e^{+}{e}^{-}$ Colliders
• Constraining CP-violating electron-gluonic operators
• Double-charming Higgs identification using machine-learning assisted jet shapes
• Light scalar beyond the Higgs mixing limit
• Polarized-boson pairs at NLO in the SMEFT
• Monochromatization interaction region optics design for direct s-channel Higgs production at FCC-ee
• Circular and Linear ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ Colliders: Another Story of Complementarity
• Scalar production and decay to top quarks including interference effects at NLO in QCD in an EFT approach
• Beautiful and charming chromodipole moments