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Higgs Decays at NLO in the SMEFT
High Energy Physics - Phenomenology · Submitted 14 Jan 2026
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim 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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The abstract, sentence by sentence
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.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The calculation of precise predictions for Higgs decays is a necessary ingredient for determining Higgs properties at the LHC and future colliders. | background 1.00 | 0.05 | 0.04 | asserted 1.00 |
| s1 | 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). | contribution 0.88 | 0.97 | 0.35 | asserted 1.00 |
| s2 | Results for four-body Higgs decays that are accurate to NLO QCD/electroweak order in the SMEFT are obtained using the narrow width approximation. | contribution 0.45 | 0.93 | 0.14 | asserted 1.00 |
| s3 | 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. | contribution 0.84 | 0.93 | 0.21 | asserted 1.00 |
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The paper
Original 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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References
How the literature uses it
3 arXiv papers cite this in 5 sentences
What it cites · 110 sentences without a confident label
Contests 1 paper
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In the SMEFT, we compute for the first time the physical $→Wff̅'$ process at NLO, superseding the known (kinematically unphysical) $→W W^*$ results [ref] .
Electroweak Corrections to Higgs to $\gamma\gamma$ and $W^+W^-$ in the SMEFT · H to Wff · contest 0.90
Builds on 3 papers
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In this work, we combine previous one-loop electroweak SMEFT results for $e^+e^-→Z$ [ref] with our NLO results for $→X$, where $X$ is a two- or three- body final state.
Impact of NLO Weak SMEFT Corrections in $e^+e^- \rightarrow ZH$ · Introduction · 0.98
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In this work, we combine previous one-loop electroweak SMEFT results for $e^+e^-→Z$ [ref] with our NLO results for $→X$, where $X$ is a two- or three- body final state.
The $e^+ e^- \rightarrow Z H$ Process in the SMEFT Beyond Leading Order · Introduction · 0.98
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The calculation of the three-body decays mirrors that of~ [ref] for $ ^+ ^-Z$, extended to include the $q qZ$, $ Z$, and $f f^ W^ $ processes.
NLO SMEFT Electroweak Corrections to Higgs Decays to 4 Leptons in the Narrow Width Approximation · SMEFT NLO Calculation · 0.99
Uses the method or tool of 23 papers
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Since all of our splittings are of the form $X →γ/g(p_i) + X(p_j)$ with spectator particle momentum $p_k$ and final-state emission only, the subtraction kernel $|𝒜_sub|^2$ is given by (see Sec. 5 of [ref] ) [equation] where the sum is over emitter-spectator pairs $⟨j k⟩$, $m_i…k^2 = (p_i + …+ p_k)^2$, and $𝒜_LO$ is the leading order amplitude for $→X$ expanded to $1/Λ^2$.
The Dipole Formalism for Next-to-Leading Order QCD Calculations with Massive Partons · Real emission · 1.00
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The resulting Feynman integrals, which we calculate using $D=4-2ϵ$ dimensional regularization, are expressed in terms of Passarino-Veltman functions [ref] , whose analytical and numerical expressions we obtain from Package-X [ref] and Collier [ref] .
Collier: a fortran-based Complex One-Loop LIbrary in Extended Regularizations · SMEFT NLO Calculation · 1.00
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The resulting Feynman integrals, which we calculate using $D=4-2ϵ$ dimensional regularization, are expressed in terms of Passarino-Veltman functions [ref] , whose analytical and numerical expressions we obtain from Package-X [ref] and Collier [ref] .
Package-X 2.0: A Mathematica package for the analytic calculation of one-loop integrals · SMEFT NLO Calculation · 1.00
Uses data or values from 3 papers
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We use the sensitivity projections of Ref. [ref] , along with the updates of Ref. [ref] .
Highlights of the HL-LHC physics projections by ATLAS and CMS · HL-LHC projections · 0.97
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We take as our inputs [ref] [equation] The vector boson masses denote here the pole definitions [ref] [equation] and correspond to experimental values of $M_W^exp=80.379 GeV$, $M_Z^exp=91.1876 GeV$, $Γ_W^exp = 2.085$ GeV, $Γ_Z^exp = 2.4952$ GeV.
Fermionic Electroweak NNLO Corrections to $e^+ e^- \to ZH$ with Polarized Beams and Different Renormalization Schemes · Inputs · 0.91
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For the $→ff̅$ processes, we take the additional on-shell inputs [ref] [equation] where only masses $m_f ≥m_f_i$ are taken to be nonzero for each $→f_i f̅_i$ channel.
Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector · Inputs · 0.98
Compares with 1 paper
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This plot can be compared to Fig. 4 of Ref. [ref] , which is obtained by setting $C_ϕ=0$ and plotting $C_ϕD$ vs. $C_ϕ$.
Complete NLO SMEFT Electroweak Corrections to Higgs Decays · Comparing Tera-Z reach with Higgstrahlung Sensitivity · 1.00
Cites as background 36 papers
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In the SMEFT, all relevant $→ff̅$ decays are known at NLO in the dimension-6 SMEFT [ref] .
NLO corrections to $h\to b\bar b$ decay in SMEFT · H to ff · 0.80
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In the SMEFT, all relevant $→ff̅$ decays are known at NLO in the dimension-6 SMEFT [ref] .
2007.15238 · H to ff · 0.80
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In the SMEFT, all relevant $→ff̅$ decays are known at NLO in the dimension-6 SMEFT [ref] .
QCD radiative corrections for $h\to b\bar b$ in the Standard Model Dimension-6 EFT · H to ff · 0.80
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