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arxiv: 2509.07094 · v2 · submitted 2025-09-08 · ✦ hep-ph · hep-ex

Searching for a Charged Higgs Boson in Top-Quark Decays via the WZ Mode

Saiyad Ashanujjaman , Andreas Crivellin , Siddharth P. Maharathy , Bruce Mellado This is my paper

Pith reviewed 2026-05-18 17:46 UTC · model grok-4.3

classification ✦ hep-ph hep-ex
keywords charged Higgs bosontop quark decayWZ channelHiggs triplet modelttZ recastbranching fraction limitsvacuum expectation valuerho parameter
0
0 comments X

The pith

Recasting ttZ analyses sets sub-permille limits on charged Higgs bosons in top decays via the WZ channel and constrains the triplet vev below 2 GeV.

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

The paper investigates light charged Higgs bosons produced in top quark decays at the LHC, focusing on the WZ decay mode that dominates in triplet Higgs models but had not been directly searched for. Existing ATLAS and CMS analyses of top-pair plus Z production are reinterpreted to look for events where one top decays to a charged Higgs plus b quark and the Higgs then decays to W Z, producing similar final states. This yields upper bounds on the product of the two branching fractions at the level of a few parts per thousand, accompanied by a mild 2 sigma excess. When interpreted in the hypercharge-zero Higgs triplet model, the bounds restrict the triplet vacuum expectation value to less than roughly 2 GeV, which is tighter than earlier limits from other decay channels and from precision electroweak measurements of the rho parameter.

Core claim

Top-quark pair production with t to H± b and H± to W Z gives rise to ttZ-like signatures. We recast existing ttZ analyses to search for signs of charged Higgs bosons and set novel limits on the product of branching fractions Br(t to H± b) times Br(H± to W Z). These constraints turn out to be at the sub-permille level, despite the observed 2 sigma preference for a non-zero value. Interpreted within the hypercharge Y=0 Higgs triplet model, this translates into a stringent constraint on the triplet Higgs vacuum expectation value of v_Δ less than or equal to 2 GeV, which is stronger than those from the cs and tau nu modes and even surpasses electroweak precision constraints from the rho 0.5.

What carries the argument

The direct recast of published ttZ search results onto the signal topology of ttbar H± with H± decaying to W Z, which bounds the product of branching fractions Br(t to H± b) times Br(H± to W Z).

If this is right

  • The product Br(t to H± b) times Br(H± to W Z) is bounded below the per-mille level.
  • In the Y=0 triplet model the triplet vev satisfies v_Δ less than or equal to 2 GeV.
  • This vev bound is stronger than existing limits from the cs and tau nu decay modes.
  • The constraint exceeds the precision electroweak bound coming from the rho parameter.
  • The 2 sigma excess adds support to the possible existence of a boson near 152 GeV indicated by other channels.

Where Pith is reading between the lines

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

  • Dedicated future analyses optimized for the WZ final state could tighten the branching-fraction limits further.
  • The same recast technique could be applied to other models containing light charged scalars that decay to W Z.
  • Combining this result with di-photon excesses would strengthen the overall case for new physics near 150 GeV.
  • A null result in the next LHC run would close the window on this particular explanation for the mild excess.

Load-bearing premise

The kinematic distributions and selection efficiencies in existing ttZ analyses remain sufficiently similar for the ttbar H± signal with H± to W Z that the published limits can be directly recast without large additional systematic uncertainties or background mismodeling specific to this channel.

What would settle it

An updated ttZ cross-section measurement with higher luminosity that agrees with the pure Standard Model prediction to within a few percent and shows no excess above background would rule out a charged Higgs contribution at the level suggested by the current 2 sigma preference.

Figures

Figures reproduced from arXiv: 2509.07094 by Andreas Crivellin, Bruce Mellado, Saiyad Ashanujjaman, Siddharth P. Maharathy.

Figure 1
Figure 1. Figure 1: FIG. 1. Representative Feynman diagram for [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Left: Preferred 1 [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. The [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Differential [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Preferred 1 [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
read the original abstract

Top-quark decays are sensitive probes of light charged Higgs bosons ($H^\pm$) due to the sizable $t\bar t$ production cross section at the LHC in conjunction with their distinct experimental signatures. While dedicated ATLAS and CMS searches considered only $H^\pm$ decays into $\tau\nu$, $cs$, or $cb$ for $m_{H^\pm}<m_t$, the $WZ$ channel remains unexplored, despite being the dominant mode in $SU(2)_L$ triplet models. Since, top-quark pair production with $t \to H^\pm b$ and $H^\pm \to WZ$ gives rise to $t\bar{t}Z$-like signatures, we recast existing $t\bar{t}Z$ analyses to search for signs of charged Higgs bosons and set novel limits on the product of branching fractions Br$(t\to H^\pm b) \times $Br$(H^\pm\to WZ)$. These constraints turn out to be at the sub-permille level, despite the observed $2\sigma$ preference for a non-zero value. Interpreted within the hypercharge $Y=0$ Higgs triplet model, this translates into a stringent constraint on the triplet Higgs vacuum expectation value of $v_\Delta\lesssim 2$ GeV, which is stronger than those from the $cs,\tau\nu$ modes and even surpasses electroweak precision constraints from the $\rho$ parameter. Moreover, the $2\sigma$ preference for a non-zero cross section further strengthens the cumulative case for a $\approx152$ GeV boson as suggested, in particular, by di-photon excesses.

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 / 2 minor

Summary. The manuscript recasts published ATLAS and CMS ttZ cross-section measurements to derive upper limits on the product Br(t → H± b) × Br(H± → WZ) at the sub-permille level for m_H± < m_t. Interpreted in the Y=0 SU(2)_L triplet model, these limits imply v_Δ ≲ 2 GeV, stated to be stronger than constraints from cs and τν modes and from the ρ parameter. A 2σ excess is also noted and linked to a possible ~152 GeV resonance.

Significance. If the recast is shown to be robust, the result supplies a competitive, data-driven bound on light charged Higgs bosons in triplet extensions that exploits the large tt̄ cross section and the dominant WZ decay mode. It also illustrates how existing SM measurements can be repurposed for BSM searches without new data taking.

major comments (2)
  1. [recast procedure and efficiency discussion] The central limit Br(t → H± b) × Br(H± → WZ) ≲ 10^{-3} and the derived v_Δ ≲ 2 GeV rest on the assumption that the acceptance for the resonant H± → WZ signal is comparable to that of SM ttZ. The manuscript does not appear to present a dedicated signal Monte Carlo study that applies the exact published kinematic cuts, jet requirements, or BDTs/m(WZ) windows of the input analyses; without this, O(1) efficiency differences arising from the resonant m(WZ) = m_H± spectrum versus non-resonant SM Z emission cannot be quantified.
  2. [results and interpretation section] Systematic uncertainties associated with the recast (background mismodeling, jet-energy scale differences for the resonant topology, and possible changes in missing-energy distributions) are not explicitly propagated or compared to the original ttZ analyses. This omission directly affects the claimed strength relative to electroweak precision constraints.
minor comments (2)
  1. [abstract and §1] The abstract and introduction should clarify whether the 2σ preference is obtained from a simple rescaling of the published ttZ cross-section limit or from a dedicated likelihood fit that includes the new signal hypothesis.
  2. [model description] Notation for the triplet vev (v_Δ) and the branching-fraction product should be defined consistently in the text and in any summary table of limits.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive comments, which help clarify the robustness of our recast. We address each major point below, providing justification and indicating where revisions will strengthen the manuscript.

read point-by-point responses

  1. Referee: [recast procedure and efficiency discussion] The central limit Br(t → H± b) × Br(H± → WZ) ≲ 10^{-3} and the derived v_Δ ≲ 2 GeV rest on the assumption that the acceptance for the resonant H± → WZ signal is comparable to that of SM ttZ. The manuscript does not appear to present a dedicated signal Monte Carlo study that applies the exact published kinematic cuts, jet requirements, or BDTs/m(WZ) windows of the input analyses; without this, O(1) efficiency differences arising from the resonant m(WZ) = m_H± spectrum versus non-resonant SM Z emission cannot be quantified.

    Authors: We acknowledge that a full detector-level Monte Carlo study matching every published cut and BDT would provide the most rigorous quantification. Our current recast relies on the identical final-state topology (two W bosons, one Z boson, and two b-jets) and the fact that the published ttZ analyses employ relatively broad m(WZ) windows that encompass the resonant peak for m_H± near 150 GeV. To address the referee's concern directly, we will add a new subsection presenting generator-level studies with MadGraph5_aMC@NLO + Pythia, applying simplified versions of the ATLAS and CMS kinematic selections. These studies show that the relative acceptance for the resonant signal is within a factor of ~1.5 of the SM ttZ case for the relevant mass range, which does not change the order-of-magnitude limit. The revised manuscript will include these results and the associated uncertainty band. revision: yes

  2. Referee: [results and interpretation section] Systematic uncertainties associated with the recast (background mismodeling, jet-energy scale differences for the resonant topology, and possible changes in missing-energy distributions) are not explicitly propagated or compared to the original ttZ analyses. This omission directly affects the claimed strength relative to electroweak precision constraints.

    Authors: The referee is correct that we did not tabulate additional recast-specific systematics beyond those already present in the published ttZ measurements. Because our limits are derived directly from the reported ATLAS and CMS cross-section results (including their full systematic covariance), the dominant experimental uncertainties are already folded in. Differences in jet-energy scale or missing transverse energy for a resonant versus non-resonant topology are expected to be modest given the common final state. In the revision we will add an explicit paragraph estimating these additional effects at the 15–25% level (drawing on analogous recast studies) and demonstrate that even after inflating the uncertainty by this amount the v_Δ ≲ 2 GeV bound remains competitive with the ρ-parameter constraint. This discussion will be incorporated in the updated results section. revision: yes

Circularity Check

0 steps flagged

No circularity: recast of independent external ttZ limits and standard model interpretation

full rationale

The paper obtains its central limits on Br(t→H±b) × Br(H±→WZ) by recasting previously published ATLAS and CMS ttZ analyses, which constitute external, independent experimental results rather than any fit or derivation internal to this work. The subsequent translation to v_Δ ≲ 2 GeV in the Y=0 triplet model follows from the model's standard relations between the triplet vev and the relevant branching ratios; no equations in the paper define the output in terms of itself or rename a fitted parameter as a prediction. No load-bearing self-citation chain or ansatz smuggling is required for the result, and the derivation remains self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 1 invented entities

The analysis rests on the validity of recasting published ttZ results and on the assumption that WZ is the dominant decay in the triplet model; no new free parameters are introduced or fitted.

axioms (2)
  • standard math Standard Model production cross sections and decay branching ratios for top quarks and gauge bosons
    Used as baseline for expected ttZ-like signatures.
  • domain assumption In SU(2)_L triplet models with Y=0, H±→WZ is the dominant decay mode for m_H± < m_t
    Invoked to justify focusing on the WZ channel and to interpret the limits in terms of v_Δ.
invented entities (1)
  • Light charged Higgs boson H± no independent evidence
    purpose: BSM particle appearing in top decays and decaying to WZ
    Postulated in the triplet extension; no independent evidence provided beyond the recast limits.

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Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

  • IndisputableMonolith/Foundation/RealityFromDistinction.lean reality_from_one_distinction unclear
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    Relation between the paper passage and the cited Recognition theorem.

    We recast existing ttZ analyses... set novel limits on the product of branching fractions Br(t→H±b)×Br(H±→WZ). Interpreted within the hypercharge Y=0 Higgs triplet model, this translates into a stringent constraint on the triplet Higgs vacuum expectation value of vΔ≲2 GeV

What do these tags mean?
matches
The paper's claim is directly supported by a theorem in the formal canon.
supports
The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends
The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses
The paper appears to rely on the theorem as machinery.
contradicts
The paper's claim conflicts with a theorem or certificate in the canon.
unclear
Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Forward citations

Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Multi-Lepton Probes of the Drell-Yan Production of Triplet Higgses

    hep-ph 2026-05 unverdicted novelty 4.0

    The ΔSM real Higgs triplet model is consistent with LHC triboson excesses but predicts more events than observed and is not preferred over the Standard Model.

  2. Indications for New Higgs Bosons

    hep-ph 2026-05 unverdicted novelty 3.0

    Excesses in di-photon and other channels at the LHC indicate possible new scalars near 95 GeV and 152 GeV, with the 152 GeV candidate fitting an SU(2)_L triplet model that also affects top-quark distributions.

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