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arXiv · 2610.07194

Unitarity limits on HH production from VBF mediated channels

A. Dobado·D. Domenech·M. Herrero·R. A. Morales
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Abstract

In this work we study the unitarity constraints on double Higgs production from Vector Boson Fusion mediated channels, specifically in $f_1 f_2 \to f_3 f_4 H_5 H_6$ scattering, where $f$ refers generically to either fermion or anti-fermion, and both cases with quarks and leptons will be considered. We focus on the beyond Standard Model contributions from anomalous quartic couplings of two electroweak gauge bosons and two Higgs bosons ($VVHH$ with $VV=WW, ZZ$) from effective operators containing four derivatives. These four derivative operators appear in the two most popular effective field theories, SMEFT (at canonical dimension 8) and HEFT (at chiral dimension 4), and their corresponding $VVHH$ effective vertices can be easily related for the considered processes here. The aim of this work is to derive jointly the unitarity constraints on these related effective vertices using the peculiarities of the VBF mediated channels with four particles in the final state while keeping the propagation of the internal $VV$ pairs being off-shell as it must be for these channels. We also discuss the relevance of the obtained constraints for $f_1 f_2 \to f_3 f_4 H_5 H_6$ at high energy colliders.

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A. Dobado, D. Domenech, M. Herrero, R. A. Morales. 2026-10-15. Unitarity limits on HH production from VBF mediated channels. https://arxiv.org/abs/2610.07194

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