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arXiv · 2501.07628

Probing New Physics with the Electron Yukawa coupling

Barbara Anna Erdelyi·Ramona Gröber·Nudzeim Selimovic
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Abstract

A dedicated run of a future electron-positron collider (FCC-ee) at a center-of-mass energy equal to the Higgs boson mass would enable a direct measurement of the electron Yukawa coupling. However, it poses substantial experimental difficulties due to large backgrounds, the requirement for monochromatised $e^+e^-$ beams, and the potential extension of the FCC-ee timeline. Given this, we explore the extent to which the electron Yukawa coupling can be enhanced in simplified UV models and examine whether such scenarios can be constrained by other FCC-ee runs or upcoming experiments at the intensity frontier. Our results indicate that in certain classes of models, the $(g-2)_e$ provides a probe of the electron Yukawa coupling that is as effective or better than the FCC-ee. Nevertheless, there exist models that can lead to sizeable deviations in the electron Yukawa coupling which can only be probed in a dedicated run at the Higgs pole mass.

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Barbara Anna Erdelyi, Ramona Gröber, Nudzeim Selimovic. 2025-01-13. Probing New Physics with the Electron Yukawa coupling. https://arxiv.org/abs/2501.07628

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