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UV origins of CP-violating leptonic Yukawa couplings

Nejc Košnik1,2,*, Ajdin Palavrić3,†, and Aleks Smolkovič1,‡

  • *Contact author: nejc.kosnik@ijs.si
  • †Contact author: ajdin.palavric@unibas.ch
  • ‡Contact author: aleks.smolkovic@ijs.si
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Phys. Rev. D 112, 095046 – Published 25 November, 2025

DOI: https://doi.org/10.1103/pmft-7966

Abstract

Probing the CP nature of the Higgs Yukawa couplings is a promising avenue for unraveling new physics effects. In this work, we investigate the possible single- and two-field UV origins of CP-violating leptonic Yukawa couplings, using the Standard Model effective field theory as a stepping stone. We demonstrate a rich set of constraints on the UV model parameters, including direct Higgs measurements, electric and magnetic dipole moments of leptons, charged lepton flavor violating observables, and electroweak precision tests. Studying representative flavor assumptions we find that the precision constraints are often, but not always, more constraining than the dedicated LHC analyses of modified leptonic Yukawa couplings.

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Phys. Rev. D 112, 095046– Published 25 November, 2025
  • Received 11 September 2025
  • Accepted 14 November 2025
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