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arxiv: 2606.30862 · v1 · pith:OYDN7ZU6new · submitted 2026-06-29 · ✦ hep-ex

Search for physics beyond the standard model in four and three top quark production events using proton-proton collisions at sqrt{s} = 13 TeV

CMS Collaboration This is my paper

Pith reviewed 2026-07-01 01:17 UTC · model grok-4.3

classification ✦ hep-ex
keywords top quark productionbeyond standard modeleffective field theoryWilson coefficientsYukawa couplingfour top quarksCMS experimentLHC
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The pith

Analysis of three- and four-top events constrains six Wilson coefficients and excludes heavy resonances in effective field theory.

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

The paper examines proton-proton collision data at 13 TeV to search for physics beyond the standard model in events containing three or four top quarks. Events are selected that contain two same-sign leptons, three leptons, or four leptons. The data are interpreted to place limits on six Wilson coefficients that modify four-fermion interactions among third-generation quarks or top-Higgs couplings within the standard model effective field theory. The same dataset is used to set exclusion limits on narrow topphilic resonances and to extract the top quark Yukawa coupling allowing both CP-even and CP-odd terms.

Core claim

Events with two same-sign, three, or four leptons from 138 fb^{-1} of 13 TeV data constrain six Wilson coefficients modifying interactions between four third-generation quarks or between top quarks and the Higgs boson, exclude narrow topphilic resonances with masses from 400 GeV to 1.6 TeV depending on spin and color, and yield an extraction of the top quark Yukawa coupling that includes possible CP-odd contributions.

What carries the argument

Selection of same-sign dilepton, trilepton, and four-lepton final states from three- and four-top production, interpreted through six dimension-six operators in the standard model effective field theory.

If this is right

  • Upper limits are placed on the magnitudes of the six Wilson coefficients that alter four-top and top-Higgs vertices.
  • Narrow resonances coupling preferentially to top quarks are excluded across 400 GeV to 1.6 TeV for several spin and color assignments.
  • The top Yukawa coupling is determined allowing both CP-even and CP-odd components.
  • The results provide direct input to global SMEFT fits that combine multiple top-quark observables.

Where Pith is reading between the lines

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

  • Future higher-luminosity runs could tighten the same six coefficients enough to distinguish among specific ultraviolet completions.
  • The multi-lepton selection strategy developed here can be reused for other rare final states involving third-generation quarks.
  • Any future deviation from the extracted Yukawa value would directly affect predictions for Higgs boson production rates in association with top quarks.

Load-bearing premise

Standard-model background processes are accurately predicted by simulation and any beyond-standard-model effects are fully captured by the six chosen Wilson coefficients without significant contributions from higher-dimensional operators.

What would settle it

Observation of a statistically significant excess in the selected multi-lepton events whose kinematic shapes cannot be accommodated by any combination of the six Wilson coefficients or the tested resonance models.

Figures

Figures reproduced from arXiv: 2606.30862 by CMS Collaboration.

Figure 1
Figure 1. Figure 1: Schematic representation of the event selection and categorization. [PITH_FULL_IMAGE:figures/full_fig_p007_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Comparison of the number of observed (points) and predicted (colored histograms) [PITH_FULL_IMAGE:figures/full_fig_p011_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Two-dimensional scan of the tttt and ttt cross sections. The color scale shows the negative log-likelihood difference with respect to the best fit point, and the contour lines show the 68% (solid) and 95% (dashed) CL intervals. The SM prediction is indicated with a black cross. The correlation ρ between the two measured cross sections is −0.98. fields and respect the SM symmetries, and are suppressed by a … view at source ↗
Figure 4
Figure 4. Figure 4: Nonzero values of the four-heavy-quark operators result in a larger signal contribution [PITH_FULL_IMAGE:figures/full_fig_p013_4.png] view at source ↗
Figure 4
Figure 4. Figure 4: Comparison of the HT distribution in the SR-2ℓ-tttt for different SMEFT scenarios relative to the SM prediction. Each line shows the ratio of the SMEFT prediction for tttt, ttt, and ttH production combined with exactly one WC at a nonzero value to the SM prediction for the same processes. The last bin includes the overflow contribution. of the six-dimensional fit is consistent with the SM expectation with … view at source ↗
Figure 5
Figure 5. Figure 5: Negative log-likelihood difference from the best fit value for the one-dimensional [PITH_FULL_IMAGE:figures/full_fig_p015_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Negative log-likelihood difference from the best fit value for the one-dimensional [PITH_FULL_IMAGE:figures/full_fig_p016_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Constraints on the individual WCs, obtained by either fixing the other WCs to zero [PITH_FULL_IMAGE:figures/full_fig_p017_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Expected (dashed lines) and observed (solid lines) exclusion contours for the two [PITH_FULL_IMAGE:figures/full_fig_p017_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Example LO Feynman diagrams for tttt production with resonant S8 → tt decay (left), tttW production with resonant V1 → tt decay (center), and doubly resonant tttt produc￾tion as V8 pair production with subsequent V8 → tt decays (right). involving the new boson, i.e., excluding the pure SM contribution. We can then add these sam￾ples to the SM samples for tttt, tttW, and tttq production to obtain the predic… view at source ↗
Figure 10
Figure 10. Figure 10: Enhancement of the tttt (left) and ttt (right) production cross section in the differ￾ent scenarios for a narrow topphilic heavy resonance with ΓX = 10 GeV as a function of mX, evaluated at LO as the difference between the cross section calculated with all SM, BSM, and interference contributions and the SM-only cross section. The coupling strength is fixed to a value of 0.2 in all scenarios. The points in… view at source ↗
Figure 11
Figure 11. Figure 11: The 95% CL exclusion limits on y1S as a function of mS1 (upper left), on y8S as a function of mS8 (upper right), on y1P as a function of mP1 (center left), on y8P as a function of mP8 (center right), on g1 as a function of mV1 (lower left), and on g8 as a function of mV8 (lower right). The area above the solid (dashed) black line indicates the observed (expected) exclusion region. The total decay width is… view at source ↗
Figure 12
Figure 12. Figure 12: Example LO Feynman diagrams for tttt (left), tttW (center), and tttq (right) produc￾tion that contain the top quark Yukawa coupling. Top quark Yukawa coupling contributions to tttt and ttt production arise from diagrams with virtual Higgs boson contributions, with examples depicted in [PITH_FULL_IMAGE:figures/full_fig_p022_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: While the tttt cross section depends only quadratically on κt and κ˜ t , the ttt cross sections include also terms with linear dependencies. This follows from diagrams with only a single tH interaction vertex, with an example shown in [PITH_FULL_IMAGE:figures/full_fig_p022_13.png] view at source ↗
Figure 13
Figure 13. Figure 13: Ratio of the tttt, tttW, and tttq cross sections with modified top quark Yukawa couplings to the SM values, evaluated at LO. The solid lines show modifications of κt for a fixed value of κ˜ t = 0, and dashed lines modifications of κ˜ t for fixed κt = 1. nificantly different from the κt , κ˜ t limits when considering scenarios very different from the SM. 6.2 Results In the fit for the extraction of the Yuk… view at source ↗
Figure 14
Figure 14. Figure 14: Expected (orange lines) and observed (purple lines) exclusion contours on the [PITH_FULL_IMAGE:figures/full_fig_p024_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: Negative log-likelihood difference from the best fit value for the one-dimensional [PITH_FULL_IMAGE:figures/full_fig_p025_15.png] view at source ↗
read the original abstract

A search for physics beyond the standard model using four and three top quark production events is reported. The analyzed proton-proton collision data were recorded at 13 TeV with the CMS detector at the CERN LHC in 2016$-$2018 and correspond to an integrated luminosity of 138 fb$^{-1}$. Events with two same-sign, three, or four leptons (electrons and/or muons) are selected. Constraints on six Wilson coefficients that modify interactions between four third-generation quarks or between top quarks and the Higgs boson in the standard model effective field theory framework are derived. The data are further used to exclude narrow topphilic heavy resonances in the mass ranges between 400 GeV and 1.6 TeV depending on their spin and color states. Finally, the top quark Yukawa coupling is extracted, considering both $CP$-even and $CP$-odd contributions.

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

0 major / 1 minor

Summary. The paper reports a search for beyond the Standard Model physics in three- and four-top quark production using proton-proton collisions at 13 TeV recorded by the CMS detector, corresponding to 138 fb^{-1}. Events with two same-sign, three, or four leptons are selected. The analysis derives constraints on six Wilson coefficients in the SMEFT framework for interactions involving four third-generation quarks or top quarks and the Higgs boson. It also excludes narrow topphilic heavy resonances in mass ranges from 400 GeV to 1.6 TeV depending on spin and color, and extracts the top quark Yukawa coupling including both CP-even and CP-odd contributions.

Significance. If the results hold, this provides significant constraints on SMEFT operators in the top sector and sets limits on potential new resonances. The multi-lepton analysis is a standard and effective approach for these processes. The extraction of the Yukawa coupling with CP considerations is a useful addition to the literature. The large data set allows for meaningful limits.

minor comments (1)
  1. [Abstract] The abstract would benefit from including at least one numerical result (e.g., a representative limit or excluded mass range) to convey the strength of the constraints immediately.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive assessment of the manuscript, the recognition of its significance, and the recommendation for minor revision. No major comments were listed in the report.

Circularity Check

0 steps flagged

No significant circularity identified

full rationale

The paper reports experimental constraints on six Wilson coefficients, resonance mass exclusions, and the top Yukawa coupling obtained by comparing observed multi-lepton data to simulated SM backgrounds plus BSM signal templates. No equations, self-definitions, or self-citation chains reduce the reported limits to quantities defined by the fit itself or to prior author work. The derivation is self-contained against external data and standard simulation benchmarks.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 0 invented entities

The central claims rest on the accuracy of SM background predictions from Monte Carlo generators, the validity of the SMEFT truncation at dimension-6, and the modeling of detector response; these are drawn from prior literature rather than derived in the paper.

free parameters (1)
  • Six Wilson coefficients
    Fitted to data to extract constraints; their values are the primary output of the analysis.
axioms (2)
  • domain assumption Standard Model background processes are accurately modeled by simulation in the selected phase space
    Invoked to separate potential signal from background in the multi-lepton final states.
  • domain assumption The SMEFT framework with the chosen six operators suffices to describe any new physics effects at 13 TeV without higher-order terms
    Used to interpret the absence of deviations as limits on those coefficients.

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discussion (0)

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Reference graph

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