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arxiv: 2605.28538 · v1 · pith:OWOMVZQCnew · submitted 2026-05-27 · ✦ hep-ex

Search for pair-produced vector-like T-quarks decaying into Ht final states in the lepton-plus-jets channel in pp collisions at sqrt{s}=13 TeV with the ATLAS detector

The ATLAS Collaboration This is my paper

Pith reviewed 2026-06-29 09:16 UTC · model grok-4.3

classification ✦ hep-ex
keywords vector-like quarksT-quarkpair productionHiggs bosontop quarkexclusion limitsbeyond Standard Modellepton plus jets
0
0 comments X

The pith

No excess above the Standard Model is observed in the search for pair-produced vector-like T-quarks decaying to Higgs-top final states, excluding masses below 1.40 to 1.66 TeV depending on the model.

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

This paper reports a search for pair-produced vector-like T-quarks in proton-proton collisions at a centre-of-mass energy of 13 TeV. The analysis targets events in which at least one T-quark decays to a Higgs boson and a top quark, with the Higgs decaying to a bottom quark pair and the top quark decaying to a charged lepton, neutrino, and bottom quark. Boosted decay products are reconstructed with variable-radius jets, and a neural network separates signal from background. A profile-likelihood fit to the effective mass distribution finds no deviation from Standard Model expectations. Limits are then placed on the pair-production cross section, yielding lower mass bounds of 1.40 TeV for the SU(2) singlet case, 1.56 TeV for the doublet case, and 1.66 TeV when the branching fraction to the Ht mode is assumed to be 100 percent. A reader would care because these bounds directly restrict the allowed parameter space for heavy vector-like quarks in extensions of the Standard Model.

Core claim

No excess above the Standard Model prediction is observed. Exclusion limits at 95 percent confidence level are set on the T-quark pair-production cross-section, corresponding to lower mass limits of 1.40 TeV in the SU(2) singlet representation, 1.56 TeV in the SU(2) doublet representation, and 1.66 TeV assuming the branching fraction of T-quarks to Ht to be 100 percent.

What carries the argument

Neural network discrimination of signal from background together with variable-radius reclustered jets for boosted resonances and a profile-likelihood fit to the effective mass distribution.

If this is right

  • The results constrain vector-like quark models in both SU(2) singlet and doublet representations.
  • The limits apply to the specific lepton-plus-jets final state with Higgs to bottom quarks and top to lepton-neutrino-bottom.
  • Additional data at higher integrated luminosity would extend the excluded mass range if no signal appears.
  • The absence of signal is consistent with the Standard Model expectation up to the reported mass thresholds.

Where Pith is reading between the lines

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

  • Combining these results with searches in other decay channels such as T to Wb or T to Zt would tighten overall bounds on vector-like quark existence.
  • The same reconstruction and discrimination techniques could be applied to searches for other heavy resonances with similar boosted decay topologies.
  • If vector-like quarks exist at accessible energies, they must either lie above the excluded masses or possess branching fractions to Ht smaller than assumed here.

Load-bearing premise

The simulation of signal and background processes accurately predicts the effective mass distribution without unaccounted systematic biases that could alter the observed limits.

What would settle it

A statistically significant excess in the effective mass distribution above the fitted background prediction in this dataset or an equivalent larger sample would falsify the no-signal conclusion.

read the original abstract

A search for pair-produced vector-like $T$-quarks in 139 fb$^{-1}$ of $pp$ collisions recorded by the ATLAS detector at a centre-of-mass energy $\sqrt{s}$=13 TeV is presented. The search targets signal events where at least one $T$-quark decays into a Higgs boson and a top quark, $T\rightarrow Ht$, with subsequent decays of the Higgs boson into a bottom quark-antiquark pair, $H\rightarrow b\bar{b}$, and the top quark into a light charged lepton, a neutrino and a bottom quark, $t\rightarrow\ell^+\nu_\ell b$, where $\ell=e/\mu$. The decay products of boosted heavy resonances are reconstructed using variable-radius, reclustered jets, and a neural network is employed to discriminate signal from Standard Model background processes. A profile-likelihood fit to the effective mass distribution is performed, and no excess above the Standard Model prediction is observed. Exclusion limits at 95% confidence level are set on the $T$-quark pair-production cross-section, corresponding to lower mass limits of 1.40 TeV in the SU(2) singlet representation, 1.56 TeV in the SU(2) doublet representation, and 1.66 TeV assuming the branching fraction of $T$-quarks to $Ht$ to be 100%.

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 / 3 minor

Summary. The manuscript reports a search for pair-produced vector-like T-quarks decaying to Ht in the lepton-plus-jets channel with 139 fb^{-1} of 13 TeV ATLAS data. Signal events feature H -> bb and t -> l nu b decays; boosted objects are reconstructed via variable-radius reclustered jets and a neural network discriminates against SM backgrounds. A profile-likelihood fit to the effective mass distribution yields no excess above the SM prediction. 95% CL exclusion limits are placed on the T-quark pair-production cross section, corresponding to lower mass bounds of 1.40 TeV (SU(2) singlet), 1.56 TeV (SU(2) doublet), and 1.66 TeV (BR(T->Ht)=100%).

Significance. If the result holds, the analysis supplies updated 95% CL mass exclusions on vector-like T-quarks in the Ht channel that are competitive with prior ATLAS and CMS searches. The use of variable-radius jet reclustering and neural-network discrimination follows established ATLAS practice for boosted-object final states; the profile-likelihood fit with profiled systematics is a standard, reproducible method for limit setting. The result rests on direct data-to-simulation comparison and is therefore falsifiable.

minor comments (3)
  1. [Abstract] Abstract: the summary does not mention the treatment or magnitude of systematic uncertainties or the neural-network validation procedure, which would allow readers to gauge the robustness of the quoted limits without consulting the body text.
  2. [Analysis strategy / fit description] The definition and construction of the effective mass variable used in the profile-likelihood fit should be stated explicitly (including any jet or lepton combinations) to permit independent reproduction of the fit.
  3. [Results figures] Figure captions for the effective-mass distributions should explicitly list the post-fit background composition and the signal hypothesis shown, for clarity.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive assessment of our manuscript and the recommendation for minor revision. The referee summary accurately reflects the analysis and results presented.

Circularity Check

0 steps flagged

No significant circularity

full rationale

The paper reports a standard experimental search: data are compared to independent Monte Carlo simulations of signal and background via a profile-likelihood fit to the effective-mass distribution after NN discrimination and jet reconstruction. The reported mass limits are direct outputs of that fit to observed data against external theoretical cross-section predictions; no step reduces by construction to a fitted input renamed as a prediction, no self-citation supplies a load-bearing uniqueness theorem, and no ansatz or renaming is smuggled in. The derivation chain is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 1 invented entities

The central claim rests on standard domain assumptions about background modeling and signal simulation that are typical in LHC searches but not independently verified from the abstract alone.

axioms (2)
  • domain assumption Standard Model processes accurately describe the background in the selected kinematic region
    The no-excess observation and subsequent limit setting depend on this assumption holding.
  • domain assumption Detector response, reconstruction efficiencies, and signal kinematics are correctly modeled in Monte Carlo simulation
    Used to determine expected signal yields and shapes for the fit.
invented entities (1)
  • Vector-like T-quark no independent evidence
    purpose: Hypothetical heavy top-partner particle in beyond-Standard-Model theories
    The T-quark is a theoretical construct from BSM models; this paper searches for it but reports no evidence of its existence.

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discussion (0)

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