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arxiv: 2511.04517 · v3 · pith:TYYH4YCTnew · submitted 2025-11-06 · ✦ hep-ph

Constraining the four-light quark operators in the SMEFT with multijet and VBF processes at linear level

Pith reviewed 2026-05-21 19:02 UTC · model grok-4.3

classification ✦ hep-ph
keywords SMEFTfour-light quark operatorsmultijet productionvector boson fusionWilson coefficientslinear interferencedifferential distributions
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0 comments X

The pith

Multijet and VBF processes can constrain ten four-light quark operators in the SMEFT via linear interference with the Standard Model.

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

This paper shows that multijet production and associated vector boson fusion processes offer a way to bound ten specific four-light quark operators in the Standard Model Effective Field Theory. Predictions for differential distributions are made at leading order for varying numbers of jets, then merged and showered to simulate realistic events. The study determines which observables give the strongest limits and maps out the directions in the ten-dimensional space of Wilson coefficients that these measurements can reach. It also compares the size of linear interference effects to quadratic ones to check where the effective theory applies.

Core claim

The interference of the Standard Model with ten four-light quark operators in the SMEFT can be constrained by multijet and Z, W, γ VBF production in association with jets. Differential distributions at different jet multiplicities are generated at LO, merged, and showered to identify sensitive observables and probe directions in the ten-dimensional coefficient space, with quadratic contributions assessed to validate the EFT.

What carries the argument

Linear interference terms between the Standard Model and the ten four-light quark operators, studied through differential distributions in multijet and vector boson fusion processes with varying jet multiplicities.

If this is right

  • Certain jet multiplicity distributions provide stronger constraints on particular Wilson coefficients.
  • The processes access complementary directions in the ten-dimensional operator space.
  • Quadratic terms can indicate the breakdown scale of the linear EFT approximation.
  • These channels complement other searches by targeting light quark operators specifically.

Where Pith is reading between the lines

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

  • Combining these results with other LHC observables could further restrict the allowed parameter space for the operators.
  • If quadratic contributions prove significant at accessible energies, it may require including higher-dimensional terms in the EFT expansion.
  • Future runs with higher statistics might resolve more subtle interference effects in the distributions.

Load-bearing premise

The linear interference terms dominate the new physics effects and the effective field theory description holds at the energies and jet multiplicities considered.

What would settle it

A precise measurement of a differential distribution in multijet or VBF-plus-jets events that deviates from Standard Model expectations in a pattern not matching the predicted linear SMEFT interference, at scales where quadratic terms remain small, would challenge the constraining power or validity assumptions.

Figures

Figures reproduced from arXiv: 2511.04517 by C\'eline Degrande, Matteo Maltoni.

Figure 2
Figure 2. Figure 2: FIG. 2. Differential ( [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. Individual ( [PITH_FULL_IMAGE:figures/full_fig_p012_9.png] view at source ↗
read the original abstract

We investigate how the interference of the SM with ten four-light quark operators in the SMEFT can be constrained thanks to multijet and $Z$, $W$, $\gamma$ VBF production in association with jets. The differential distributions for each process are generated at LO for different jet multiplicities, that are then merged and showered. We check which observables provide better bounds on the Wilson coefficients, and what directions in the ten-dimensional coefficient space they are able to probe. We discuss the relevance of the quadratic contributions with respect to the linear terms and use them to assess the validity of the EFT approach.

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 / 2 minor

Summary. The manuscript investigates constraints on ten four-light quark operators in the SMEFT by studying their linear interference with the SM in multijet production and VBF processes (Z, W, γ + jets). LO differential distributions are generated for varying jet multiplicities, merged, and showered; the authors identify sensitive observables, map the directions they probe in the ten-dimensional Wilson coefficient space, and compare quadratic contributions to linear terms to assess EFT validity.

Significance. If the linear terms are quantitatively shown to dominate the selected observables in the merged samples, the work would usefully expand the set of processes available for constraining light-quark SMEFT operators and clarify which kinematic regions and final states are most informative. The explicit treatment of quadratic terms and the use of merged multi-jet samples are positive features that could strengthen the reliability of the resulting bounds for global fits.

major comments (1)
  1. [Discussion of quadratic contributions (referenced in abstract)] The central claim that the extracted limits can be interpreted as linear SMEFT constraints rests on linear interference dominating over quadratic contributions across the relevant distributions. The abstract states that quadratic terms are discussed to assess validity, but it is unclear whether explicit ratios (quadratic/linear) or relative size plots are shown for the high-pT or high-mass tails of the merged multijet and VBF samples after showering; without such quantitative evidence the bounds lose their linear interpretation.
minor comments (2)
  1. Observable definitions and binning choices for the differential distributions should be stated more explicitly, including any cuts applied after merging.
  2. A brief comparison table of the resulting bounds with existing limits from other processes (e.g., dijet or top-pair) would help place the new constraints in context.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for the constructive feedback. We appreciate the positive remarks on the treatment of quadratic terms and merged samples. Below we address the major comment regarding the explicit demonstration of linear dominance in the relevant distributions.

read point-by-point responses
  1. Referee: The central claim that the extracted limits can be interpreted as linear SMEFT constraints rests on linear interference dominating over quadratic contributions across the relevant distributions. The abstract states that quadratic terms are discussed to assess validity, but it is unclear whether explicit ratios (quadratic/linear) or relative size plots are shown for the high-pT or high-mass tails of the merged multijet and VBF samples after showering; without such quantitative evidence the bounds lose their linear interpretation.

    Authors: We agree that a clear quantitative demonstration is essential for the linear interpretation of the bounds. In the current manuscript we compare quadratic and linear contributions for selected observables at parton level (Section 4) to assess EFT validity, but we acknowledge that explicit ratio plots focused on the high-pT and high-mass tails of the merged, showered samples for multijet and VBF processes are not presented. We will add these plots (new figures in Section 4) showing the quadratic-to-linear ratio in the relevant kinematic regions after merging and showering. This will directly support the claim that linear interference dominates in the distributions used for the constraints. revision: yes

Circularity Check

0 steps flagged

No significant circularity; simulation-based constraints on SMEFT operators

full rationale

The paper generates LO differential distributions for multijet and VBF+jet processes at varying multiplicities, merges and showers them, then evaluates which observables best constrain the ten Wilson coefficients while comparing linear interference to quadratic terms for EFT validity. This chain rests on standard Monte Carlo event generation and physical process modeling rather than any self-definitional reduction, fitted parameter renamed as prediction, or load-bearing self-citation. No equation or step equates a claimed result to its own input by construction, and the central claim remains independently falsifiable via the simulated observables.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 0 invented entities

Based solely on the abstract, the analysis rests on standard SMEFT assumptions and simulation techniques; no explicit free parameters beyond the Wilson coefficients themselves or invented entities are described.

free parameters (1)
  • Wilson coefficients of the ten four-light quark operators
    These are the parameters whose values are being constrained by the simulated distributions.
axioms (2)
  • domain assumption SMEFT with dimension-6 four-quark operators
    Standard framework invoked for parameterizing new physics effects.
  • domain assumption Leading-order QCD with merging and parton showering sufficient for differential distributions
    Method used to generate the observables for bounding the coefficients.

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