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arxiv: 2606.20054 · v1 · pith:MXTZO3ODnew · submitted 2026-06-18 · ✦ hep-ph · hep-ex

Non-standard decays of vector-like top partners in a 2-Higgs doublet model at the HL-LHC

Tanumoy Mandal , Stefano Moretti , Rachit Sharma This is my paper

Pith reviewed 2026-06-26 17:02 UTC · model grok-4.3

classification ✦ hep-ph hep-ex
keywords vector-like quarkscharged Higgs bosonHL-LHCtau leptonsmissing transverse energynon-standard decaystwo-Higgs doublet model
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The pith

The 2τ + 2b + missing transverse energy channel can discover vector-like top partners up to 1.9 TeV at the HL-LHC.

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

This paper examines non-standard decays of vector-like top partners in two-Higgs-doublet models, where the partner T decays to a charged Higgs that then produces a tau and neutrino. The resulting final state of two taus, two b-jets and missing transverse energy is analyzed at the high-luminosity LHC using kinematic observables from visible particles and the missing momentum vector. Polarization variables from the hadronic tau decays serve as additional handles to identify the spin-zero parent. With 3 ab inverse of data at 14 TeV, the Asimov significance calculation indicates that discovery-level sensitivity is reachable for vector-like quark masses near 1.9 TeV. The channel is presented as largely orthogonal to existing searches that assume standard-model-like decays of the vector-like quarks.

Core claim

In extensions with both an enlarged scalar sector and vector-like fermions, the vector-like top partner T can decay via T to H± b followed by H± to τν, yielding a 2τ + 2b + MET signature. A model-independent analysis constructs global kinematic observables from visible objects and the missing transverse momentum to suppress backgrounds, while polarization-sensitive variables built from hadronic tau decay products probe the spin-0 origin of the taus. The expected discovery sensitivity evaluated with the Asimov significance at 3 ab inverse and 14 TeV shows that this channel reaches vector-like quark masses up to approximately 1.9 TeV.

What carries the argument

The 2τ + 2b + MET final state arising from T → H± b, H± → τν, discriminated by global kinematic observables from visible objects plus MET and by polarization variables from hadronic tau decays.

If this is right

  • Observation of the 2τ + 2b + MET excess would point to non-standard vector-like quark decays involving additional Higgs states rather than standard-model-like modes.
  • The channel supplies an orthogonal search strategy that existing experimental limits on vector-like quarks do not cover.
  • Discovery sensitivity extending to 1.9 TeV implies that the high-luminosity LHC can test a sizable fraction of the viable parameter space in two-Higgs-doublet models with vector-like fermions.
  • Polarization observables provide an independent handle that can confirm the charged-Higgs origin of the taus if a signal appears.

Where Pith is reading between the lines

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

  • Similar final-state selections could be applied to other extended Higgs models that allow vector-like quarks to decay into charged scalars.
  • Absence of a signal would set upper limits on the branching fraction of vector-like tops into charged Higgs bosons.
  • Combining this channel with standard vector-like quark searches could tighten overall mass bounds or reveal inconsistencies between decay modes.

Load-bearing premise

Kinematic observables and polarization-sensitive variables built from visible objects and missing transverse momentum are assumed sufficient to reduce dominant backgrounds enough for discovery sensitivity as computed with the Asimov significance.

What would settle it

A detailed background estimation or full detector simulation that shows the background rejection falls short of the level needed for Asimov significance above 5 at 1.9 TeV would falsify the claimed discovery reach.

Figures

Figures reproduced from arXiv: 2606.20054 by Rachit Sharma, Stefano Moretti, Tanumoy Mandal.

Figure 1
Figure 1. Figure 1: FIG. 1. Representative Feynman diagram for the signal process [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Normalized distributions of the primary kinematic discriminants for the signal benchmark with [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Distributions of the tau polarization-sensitive variables [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Expected [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
read the original abstract

Extensions of the Standard Model featuring both an enlarged scalar sector and vector-like fermions arise naturally in a wide class of well-motivated theoretical frameworks. In such scenarios, vector-like Quarks (VLQs) can exhibit non-standard decay modes involving additional Higgs states, giving rise to distinctive collider signatures that remain largely unexplored by existing experimental searches. We investigate the prospects of probing this possibility at the high-luminosity Large Hadron Collider (HL-LHC) through the decay of vector-like top partner ($T$) to charged Higgs ($H^{\pm}$) followed by the decay, $H^\pm\to\tau\nu$, producing a final state containing two tau leptons, two $b$-jets, and missing transverse energy. A model-independent collider analysis is performed using global kinematic observables constructed from visible objects and the missing transverse momentum vector to suppress the dominant backgrounds. Polarization-sensitive observables built from the hadronic $\tau$ decay products are also examined as complementary probes of the spin-$0$ origin of the $\tau$ leptons. The expected discovery sensitivity is evaluated using the Asimov significance for an integrated luminosity of $3$ ab$^{-1}$ at $\sqrt{s}=14$ TeV. Our results demonstrate that the $2\tau\:+\:2b\:+$ missing $E_T$ channel provides a promising and largely orthogonal avenue to search for non-standard VLQ decays in extended Higgs sectors, with discovery-level sensitivity achievable for VLQ masses up to approximately $1.9$ TeV.

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

2 major / 1 minor

Summary. The manuscript presents a model-independent collider study of non-standard decays of vector-like top partners T → H± b (with H± → τν) in a 2HDM, targeting the 2τ + 2b + MET final state at the HL-LHC. It employs global kinematic observables from visible objects and MET together with hadronic-τ polarization variables to suppress backgrounds, and projects discovery sensitivity (Asimov significance) up to m_T ≈ 1.9 TeV at 3 ab⁻¹.

Significance. If the projected sensitivity is robust, the work identifies an orthogonal search channel for VLQ non-standard decays in extended Higgs sectors that is not covered by existing experimental strategies, potentially extending the HL-LHC reach for TeV-scale new physics in well-motivated BSM frameworks.

major comments (2)
  1. [sensitivity evaluation and results] The central sensitivity claim (discovery reach to 1.9 TeV) is evaluated using Asimov significance on Monte Carlo samples; the analysis does not incorporate systematic uncertainties on background normalizations, τ-identification efficiencies, or MET resolution smearing. This assumption is load-bearing for the quoted mass reach, as even moderate degradation would reduce the significance below 5σ.
  2. [collider analysis and event selection] The background suppression strategy relies on particle-level kinematic and polarization observables; no full detector simulation (including jet energy resolution, τ-tagging, or pile-up effects) is presented to validate that the reported S/B ratios survive realistic experimental conditions.
minor comments (1)
  1. [abstract] The abstract states the final state as '2τ + 2b + missing ET' but does not explicitly note whether the τ leptons are required to be hadronic; this should be clarified for reproducibility.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful review and constructive comments. We address each major point below and outline revisions to strengthen the manuscript.

read point-by-point responses

  1. Referee: The central sensitivity claim (discovery reach to 1.9 TeV) is evaluated using Asimov significance on Monte Carlo samples; the analysis does not incorporate systematic uncertainties on background normalizations, τ-identification efficiencies, or MET resolution smearing. This assumption is load-bearing for the quoted mass reach, as even moderate degradation would reduce the significance below 5σ.

    Authors: We agree that the absence of systematic uncertainties is a limitation for the quoted discovery reach. In the revised manuscript we will add a new subsection that estimates the impact of moderate systematics (e.g., 10–20 % on background normalizations, 5 % on τ identification, and MET smearing) on the Asimov significance. We will then quote a more conservative mass reach under these assumptions while retaining the conclusion that the channel remains promising. This directly addresses the concern. revision: yes

  2. Referee: The background suppression strategy relies on particle-level kinematic and polarization observables; no full detector simulation (including jet energy resolution, τ-tagging, or pile-up effects) is presented to validate that the reported S/B ratios survive realistic experimental conditions.

    Authors: The study is performed at particle level, which is standard for phenomenological projections that aim to identify new search channels. A full GEANT-level detector simulation lies outside the scope of this theoretical work. In revision we will add a dedicated paragraph that qualitatively assesses the expected degradation from jet energy resolution, τ-tagging efficiencies, and pile-up, referencing typical values reported by ATLAS and CMS. This will clarify the robustness of the S/B ratios under realistic conditions. revision: partial

Circularity Check

0 steps flagged

No significant circularity; sensitivity projection is simulation-driven and independent of result.

full rationale

The paper performs a model-independent collider analysis using Monte Carlo simulations of signal and background processes with standard tools, applies kinematic and polarization observables to estimate yields, and computes projected Asimov significance at 3 ab^{-1}. No parameters are fitted to the target data or observables, no self-citations underpin the central sensitivity claim, and the derivation from model assumptions to projected mass reach does not reduce to its own inputs by construction. This is a standard forward projection with no load-bearing circular steps.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 0 invented entities

The central claim rests on the validity of the 2HDM+VLQ model and the accuracy of kinematic discrimination in simulations. No new entities are invented; parameters are the masses and couplings typical in such models.

free parameters (2)
  • VLQ mass
    The mass of the vector-like top partner is a free parameter scanned in the analysis to determine the reach.
  • Charged Higgs mass
    Mass of H± is another parameter in the model.
axioms (2)
  • domain assumption The 2HDM extended with VLQs is a valid theoretical framework
    The paper assumes the existence of such models without deriving them.
  • domain assumption Standard Model backgrounds can be accurately modeled with Monte Carlo
    Relies on standard simulation for backgrounds like ttbar.

pith-pipeline@v0.9.1-grok · 5811 in / 1535 out tokens · 35711 ms · 2026-06-26T17:02:22.120120+00:00 · methodology

discussion (0)

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Reference graph

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