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arxiv: 1907.00648 · v1 · pith:POF37RSWnew · submitted 2019-07-01 · ✦ hep-ph

Is the observed 125 GeV Higgs boson expected to be SM-like in the NMSSM?

Conny Beskidt (1) , Wim de Boer (1) ((1) Dept. of Phys. , Karlsruhe Inst. for Technology KIT , Karlsruhe , Germany) This is my paper

Pith reviewed 2026-05-25 12:04 UTC · model grok-4.3

classification ✦ hep-ph
keywords NMSSMHiggs bosonsignal strengthsdeviationscorrelationsparameter scanningsinglet mixing
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The pith

Deviations from SM signal strengths are expected for the 125 GeV Higgs in the NMSSM due to mixing and extra decays.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper claims that the 125 GeV Higgs boson in the Next-to-Minimal Supersymmetric Standard Model will not match Standard Model predictions exactly. Mixing with an extra singlet-like Higgs and possible new decays to light neutralinos or pseudo-scalars produce shifts in observed signal strengths. These shifts show characteristic correlations or anti-correlations between bosonic and fermionic final states. An efficient scanning method maps the regions of parameter space where these patterns appear. A sympathetic reader would care because the patterns give concrete, testable signatures that could distinguish the NMSSM from the pure Standard Model at the LHC.

Core claim

In the NMSSM deviations from the SM signal strengths of the 125 GeV Higgs boson are expected because of the mixing with the additional singlet-like Higgs boson and/or additional decays into pairs of light particles, like neutralinos, pseudo-scalar Higgs bosons or singlet Higgs bosons. The size of the possible deviations and their expected correlations or anti-correlations between bosonic and fermionic final states are analyzed using the efficient parameter scanning technique with complete coverage. The regions of parameter space with correlated or anti-correlated deviations of the signal strengths are identified.

What carries the argument

The efficient parameter scanning technique with complete coverage that maps regions of parameter space showing correlated or anti-correlated deviations in bosonic versus fermionic signal strengths.

If this is right

  • Signal strengths in bosonic channels such as diphoton and ZZ will deviate from SM values in a manner correlated or anti-correlated with fermionic channels such as bb and tau tau.
  • Additional invisible or exotic decays into light neutralinos or light Higgs states will reduce the visible signal strengths below SM expectations.
  • The size of the deviations is set by the mixing angle between the doublet-like and singlet-like Higgs states.
  • Parameter regions with large mixing produce the largest deviations while small-mixing regions remain closer to SM-like.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Current LHC Higgs coupling measurements already constrain the allowed size of these deviations and can be reinterpreted directly in the NMSSM.
  • Future precision measurements at the High-Luminosity LHC could detect the predicted correlation patterns even if individual channels remain consistent with the SM within present errors.
  • If no such correlated deviations appear, the NMSSM would require additional mechanisms, such as decoupling limits or new decay modes that cancel the mixing effects, to remain viable.

Load-bearing premise

The efficient parameter scanning technique with complete coverage can be used to identify regions of parameter space with correlated or anti-correlated deviations of the signal strengths.

What would settle it

A global fit to all bosonic and fermionic signal-strength measurements showing no deviation from Standard Model values in any region of NMSSM parameter space would falsify the claim that deviations are expected.

Figures

Figures reproduced from arXiv: 1907.00648 by Conny Beskidt (1), Germany), Karlsruhe, Karlsruhe Inst. for Technology KIT, Wim de Boer (1) ((1) Dept. of Phys..

Figure 1
Figure 1. Figure 1: FIG. 1. The sum of the mixing matrix elements squared for the SM-like Higgs boson as function of tan [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Sketch of the sampling technique to determine the allowed NMSSM parameter space. The sampling is done by [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. BRs of the 125 GeV Higgs boson into lighter particles as function of the mass of the lighter particle, which can be [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Fitted signal strengths [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. The figure demonstrates in the top left panel (a) the correlated deviation of all signal strengths from the SM expectation [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. As Fig. 5, but for CASE II. In this case the change in signal strengths in panel (a) originates from the change [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. As Fig. 5, but for CASE III. The variation of the signal strengths originates from a variation of all reduced couplings [PITH_FULL_IMAGE:figures/full_fig_p010_7.png] view at source ↗
Figure 6
Figure 6. Figure 6: In the third case the singlet-like and SM-like Higgs bosons are rather close in mass, which allows for a strong [PITH_FULL_IMAGE:figures/full_fig_p011_6.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. Combined measurements of the products [PITH_FULL_IMAGE:figures/full_fig_p014_8.png] view at source ↗
read the original abstract

In the Next-to Minimal Supersymmetric Standard Model (NMSSM) deviations from the SM signal strengths of the 125 GeV Higgs boson are expected, because of the mixing with the additional singlet-like Higgs boson and/or additional decays into pairs of light particles, like neutralinos, pseudo-scalar Higgs bosons or singlet Higgs bosons. In this paper the size of the possible deviations and their expected correlations or anti-correlations between \textit{bosonic} and \textit{fermionic} final states are analyzed using the efficient parameter scanning technique with complete coverage presented in a companion paper. The regions of parameter space with correlated or anti-correlated deviations of the signal strengths are identified.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 0 minor

Summary. The paper claims that deviations from SM-like signal strengths for the 125 GeV Higgs are expected in the NMSSM due to mixing with a singlet-like Higgs and/or additional decays to light particles (neutralinos, pseudoscalars, singlets). It analyzes the magnitude of these deviations and their correlations or anti-correlations between bosonic and fermionic final states by applying an efficient parameter-scanning technique asserted to have complete coverage (from a companion paper), and identifies the corresponding regions of NMSSM parameter space.

Significance. If the scan completeness holds, the work would usefully map expected patterns of correlated deviations, providing concrete targets for LHC analyses that could help discriminate NMSSM from the SM or other BSM scenarios. The emphasis on bosonic vs. fermionic correlations is a concrete, testable output.

major comments (1)
  1. [Abstract and §1] Abstract and §1: The central claim that specific regions with correlated/anti-correlated bosonic/fermionic signal-strength deviations can be identified rests on the assertion that the companion paper's scanning technique achieves 'complete coverage'. No independent check of that coverage, of the measure used to define 'complete', or of possible biases against regions with light singlets/neutralinos is supplied here. If the scan systematically under-samples those regions, the reported correlations are not guaranteed to be representative.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and for highlighting the importance of the scanning method's completeness. The central issue raised concerns the reliance on the companion paper for validation of complete coverage and the absence of an independent check or discussion of possible biases in this work. We respond to this point below and indicate where revisions can be made.

read point-by-point responses

  1. Referee: [Abstract and §1] Abstract and §1: The central claim that specific regions with correlated/anti-correlated bosonic/fermionic signal-strength deviations can be identified rests on the assertion that the companion paper's scanning technique achieves 'complete coverage'. No independent check of that coverage, of the measure used to define 'complete', or of possible biases against regions with light singlets/neutralinos is supplied here. If the scan systematically under-samples those regions, the reported correlations are not guaranteed to be representative.

    Authors: The scanning technique, including the precise definition of complete coverage, the measure employed, and explicit checks against under-sampling of regions containing light singlets or neutralinos, is developed and validated in the companion paper. The present manuscript applies that method to the specific question of 125 GeV Higgs signal-strength deviations and their bosonic/fermionic correlations. We acknowledge that an independent summary of these coverage properties is not repeated here. In a revised version we will add a concise paragraph in §2 that outlines the key features of the scan (including its handling of light-particle regions) while referring readers to the companion paper for the full technical validation. We maintain that the method does not systematically under-sample the relevant regions, but we agree that a brief reminder of this point will strengthen the presentation. revision: yes

Circularity Check

0 steps flagged

NMSSM signal strength analysis uses companion scan as tool without reducing claims to self-citation by construction

full rationale

The paper starts from the standard expectation in the NMSSM that the 125 GeV Higgs mixes with a singlet-like Higgs and can have additional decays, leading to deviations from SM signal strengths. It then uses an efficient scanning technique from a companion paper to explore parameter space and identify regions with correlated or anti-correlated deviations in bosonic and fermionic channels. This use of a self-cited method for scanning does not constitute circularity because the physical predictions derive from the NMSSM Lagrangian and mixing, not from redefining quantities in terms of the scan results. No self-definitional loops, fitted inputs presented as predictions, or uniqueness theorems imported from self-citations are present. The derivation chain remains self-contained against the NMSSM model assumptions.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 0 invented entities

The paper assumes the NMSSM framework with its additional singlet field and scans its parameters to find Higgs signal deviations; many free parameters typical of SUSY models are involved but not enumerated here.

free parameters (1)
  • NMSSM model parameters
    Multiple couplings, masses, and mixing angles in the NMSSM that are scanned over to find allowed regions.
axioms (1)
  • domain assumption NMSSM is a valid extension of the MSSM with an additional singlet superfield
    Assumed as the basis for the entire analysis.

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discussion (0)

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