What does this research mean for the field?

Next-to-leading order (NLO) QCD and electroweak corrections in the dimension-6 Standard Model Effective Field Theory (SMEFT) can be comprehensively calculated for two-, three-, and four-body Higgs decays using the newly developed NEW i SH Monte Carlo program to improve predictions for future colliders. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

May 12, 2026Journal of High Energy Physics0 citationsOpen Access

Higgs decays at NLO in the SMEFT

LBLuigi BellafronteFlorida State University SDS. DawsonBrookhaven National Laboratory CPClara Del PioBrookhaven National Laboratory

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Abstract

A bstract 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, NEW i SH, 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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