Higgs-induced lepton flavor violation
Andreas Goudelis, Oleg Lebedev, Jae-hyeon Park
TL;DR
This paper investigates how higher-dimensional operators can induce lepton flavor violation via the Standard Model Higgs, deriving bounds and quantifying effects in lepton decays and electric dipole moments.
Contribution
It provides model-independent bounds on Higgs flavor-violating couplings and analyzes LFV effects at 1-loop and 2-loop levels.
Findings
Significant Higgs-mediated LFV effects at 1-loop level.
Additional LFV contributions at 2-loop level.
Derived bounds constrain new physics contributions.
Abstract
Due to the smallness of the lepton Yukawa couplings, higher-dimensional operators can give a significant contribution to the lepton masses. In this case, the lepton mass matrix and the matrix of lepton-Higgs couplings are misaligned leading to lepton flavor violation (LFV) mediated by the Standard Model Higgs boson. We derive model-independent bounds on the Higgs flavor violating couplings and quantify LFV in decays of leptons and electric dipole moments for a class of lepton-Higgs operators contributing to lepton masses. We find significant Higgs-mediated LFV effects at both 1-loop and 2-loop levels.
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