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arXiv · 2408.08948

Accidental Suppression of Wilson Coefficients in Higgs Coupling

Yunjia Bao·Jiayin Gu·Zhen Liu·Chi Shu·Lian-Tao Wang
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Abstract

Higgs couplings are essential probes for physics beyond the Standard Model (BSM) since they can be modified by new physics, such as through the Higgs portal interaction $|H|^2\mathcal{O}$. These modifications influence Higgs interactions via dimension-6 operators of the form $ \left(\partial |H|^2\right)^2$ and $|H|^6$, which are generally expected to be of comparable size. This paper discusses a phenomenon of accidental suppression, where the $|H|^6$ coupling is significantly smaller than $\left(\partial |H|^2\right)^2$. This suppression, arising from the truncation of the tree-level effective potential, lacks a clear symmetry explanation but persists in portal models. This paper aims to inspire further studies on additional instances of accidental suppression without symmetry explanations or a general framework to characterize such suppression. We also discuss constraints, at the HL-LHC and future colliders, on the Wilson coefficients of the two dimension-6 operators for various benchmark scenarios of the concrete model.

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Yunjia Bao, Jiayin Gu, Zhen Liu, Chi Shu, Lian-Tao Wang. 2024-08-16. Accidental Suppression of Wilson Coefficients in Higgs Coupling. https://arxiv.org/abs/2408.08948

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