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arXiv · 2601.09599

Higgs Decays at NLO in the SMEFT

Luigi Bellafronte·Sally Dawson·Clara Del Pio·Matthew Forslund·Pier Paolo Giardino
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Abstract

The calculation of precise predictions for Higgs decays is a necessary ingredient for determining Higgs properties at the LHC and future colliders. We compute all two- and three-body Higgs decays at next-to-leading order (NLO) in both QCD and electroweak interactions using the dimension-6 Standard Model Effective Field Theory (SMEFT). Results for four-body Higgs decays that are accurate to NLO QCD/electroweak order in the SMEFT are obtained using the narrow width approximation. Our results are contained in a flexible Monte Carlo program, NEWiSH, that is publicly available and we illustrate the impact of the NLO electroweak corrections for HL-LHC, Tera-Z, and Higgstrahlung projections.

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Luigi Bellafronte, Sally Dawson, Clara Del Pio, Matthew Forslund, Pier Paolo Giardino. 2026-01-14. Higgs Decays at NLO in the SMEFT. https://arxiv.org/abs/2601.09599

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