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arxiv: 2605.01488 · v1 · submitted 2026-05-02 · ✦ hep-ph

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

Siddharth P. Maharathy , Srimoy Bhattacharya , Andreas Crivellin , Mukesh Kumar , Rachid Mazini , Bruce Mellado
Authors on Pith no claims yet

Pith reviewed 2026-05-09 14:29 UTC · model grok-4.3

classification ✦ hep-ph
keywords real Higgs tripletDrell-Yan productiontriboson excessesmulti-lepton final states152 GeV Higgselectroweak bosonsLHC phenomenology
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The pith

The real triplet Higgs model fits triboson excesses but overpredicts observed event rates.

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

This paper tests if the real Higgs triplet model with zero hypercharge, introduced to explain excesses at 152 GeV in di-photon, Z gamma and WW channels without a corresponding ZZ excess, can also account for the triboson production excesses reported by ATLAS and CMS. The authors calculate the Drell-Yan production of the triplet scalars and their subsequent decays into electroweak bosons, which enhance multi-lepton signatures in channels such as WWZ and VVZ. They compare these predictions directly to existing LHC data and find that the model remains consistent with the observations while the data mildly favors new physics at 2.6 sigma, yet the predicted rates exceed what is seen. This leaves the model compatible but not preferred over the Standard Model, with the discrepancy potentially resolvable by higher-luminosity runs.

Core claim

In the real Higgs triplet model (ΔSM), Drell-Yan production of the triplet scalars leads to enhanced cross sections for triboson final states that decay into multi-lepton signatures. Comparison with current ATLAS and CMS data shows a 2.6σ preference for non-zero new physics, but the model predicts more events than observed, rendering it consistent with data yet not favored over the Standard Model alone.

What carries the argument

Drell-Yan production of triplet scalars in the real Higgs triplet model with Y=0, followed by their dominant decays to electroweak bosons that produce multi-lepton final states from WWZ, WZZ and WWW processes.

If this is right

  • The model predicts specific enhancements in multi-lepton channels from triboson decays without producing an excess in ZZ.
  • The current mild tension between predicted and observed rates can be tested with increased statistics from Run 3 and the high-luminosity LHC.
  • The triplet scalars provide a common origin for both the 152 GeV Higgs-like excesses and the triboson signals.

Where Pith is reading between the lines

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

  • Confirmation would link multiple LHC anomalies to one concrete extension of the Higgs sector.
  • Dedicated multi-lepton searches in additional final states could further constrain or support the triplet hypothesis.
  • The overprediction may point to the value of refined background modeling in the triboson analyses.

Load-bearing premise

The observed excesses in di-photon, Z gamma, WW and triboson channels all arise from the same 152 GeV Higgs bosons in the real triplet model produced via Drell-Yan processes.

What would settle it

Future LHC data at Run 3 or HL-LHC luminosities that show triboson event yields either significantly below the model's prediction or fully consistent with Standard Model expectations alone would rule out the model's ability to explain the excesses.

Figures

Figures reproduced from arXiv: 2605.01488 by Andreas Crivellin, Bruce Mellado, Mukesh Kumar, Rachid Mazini, Siddharth P. Maharathy, Srimoy Bhattacharya.

Figure 1
Figure 1. Figure 1: Measured signal strengths relative to the expected view at source ↗
Figure 2
Figure 2. Figure 2: Left: Dominant branching ratios of ∆0 , including the uncertainties estimated from Ref. [40], and m∆0 = 150 GeV. Right: Dominant branching ratios of ∆±, including the uncertainties estimated from Ref. [40], as a function of its mass. We have assumed α ≈ 0. performed a chi-square analysis with the available binned observed data, SM prediction, and the NP contribution, assuming Br(t → ∆±b) × Br(∆± → W Z) as … view at source ↗
Figure 3
Figure 3. Figure 3: Feynman diagram for the Drell-Yan production of view at source ↗
Figure 4
Figure 4. Figure 4: Representative Feynman diagram for pp → tt¯ with t → ∆±b and ∆± → W±Z, leading to a ttZ¯ −like SM signature and tW Z−like SM signature with additional b￾jets. erence, see Ref [41]. Multi-lepton searches we studied in Refs. [16, 24], finding that the scalar triplet is consistent with data. Here we want to consider these channels in more detail recasting the multi-boson searches discussed above. 4 Results In… view at source ↗
Figure 5
Figure 5. Figure 5: Left: Chi-square distribution as a function of the fitting parameter view at source ↗
Figure 6
Figure 6. Figure 6: Left: χ 2 contours as a function of x and Br(t → ∆±b) assuming Br(∆0 → WW) = 100%. We find a preference for NP of ≈ 3σ (for 2DoF). Same for Br(∆0 → WW) = 0% resulting in ≈ 2.5σ. In the above chi-square distribution, x = 0 and Br(t → ∆±b) = 0 corresponds to the SM model, while x = 1 corresponds to the real triplet model. program should be able to decisively test this prediction. Confirmation of the triboson… view at source ↗
read the original abstract

Excesses in di-photon, $Z\gamma$, and $WW$ spectra indicate the existence of a new Higgs boson with mass $152 \pm 1$ GeV. However, no excess is observed in the $ZZ$ channel. This pattern aligns with a Real Higgs Triplet model with hypercharge $Y = 0$ ($\Delta$SM). A prediction of this model is the Drell--Yan production of scalars at the LHC, which dominantly decay to electroweak bosons, thus enhancing the cross sections of triboson channels such as $WWZ$, $WZZ$, and $WWW$. Interestingly, both ATLAS and CMS have reported higher-than-expected significances for such processes: $6.4\sigma$ (observed) vs $4.7\sigma$ (expected) in the $VVZ$ (where $V = W$ or $Z$) channel and $4.4\sigma$ vs $3.6\sigma$ in $WWZ$, suggesting the possibility that these signals may be manifestations of an extended Higgs sector. We investigate whether the $\Delta$SM can account for these triboson excesses through electroweak production and decay of triplet scalars. We find that while current data prefers a non-zero new physics signal ($2.6\sigma$), the $\Delta$SM predicts more events than observed, such that it is consistent with data but not preferred over the SM. However, this tension could be clarified with Run~3 and HL-LHC data.

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 paper claims that excesses in di-photon, Zγ, and WW spectra point to a 152 GeV Higgs from the real Higgs triplet model (ΔSM, Y=0), which naturally suppresses ZZ. This model predicts Drell-Yan production of triplet scalars decaying to electroweak bosons, enhancing triboson rates. The authors compare this to ATLAS/CMS excesses in VVZ (6.4σ obs vs 4.7σ exp) and WWZ (4.4σ vs 3.6σ), finding data prefers non-zero NP at 2.6σ but that ΔSM overpredicts events, so it is consistent with data yet not preferred over the SM; future Run 3/HL-LHC data may resolve the tension.

Significance. If the result holds, the work supplies a concrete, multi-lepton test of the ΔSM that links the 152 GeV candidate directly to triboson final states via a single free parameter (triplet mass). The quantitative comparison of predicted versus observed event yields using existing public data is a strength and yields a falsifiable statement about overprediction. This adds to the toolkit for extended Higgs searches even if the current tension is only mild.

major comments (2)
  1. [Results section] Results section: the central claim that ΔSM overpredicts triboson events (rendering it consistent but not preferred) is load-bearing and rests on fixing the triplet scalar mass to 152 GeV from the diphoton/Zγ/WW excesses. The manuscript does not supply the explicit Drell-Yan cross-section values, branching ratios for neutral/charged components, or acceptance corrections used to obtain the predicted yields; without these the overprediction cannot be verified and the stress-test concern on parameter transfer remains open.
  2. [§3 (Triboson production and decay)] §3 (Triboson production and decay): the assumption that the same electroweak production and decay modes transfer without modification from the 152 GeV signals to VVZ/WWZ final states is not cross-checked against possible interference with SM amplitudes or differences in lepton acceptance; this directly affects whether the predicted excess is robust.
minor comments (2)
  1. [Abstract] Abstract and introduction: the 2.6σ figure is quoted without stating whether it is for the combined VVZ+WWZ dataset or a single channel; adding this clarification would improve precision.
  2. [Introduction] References: the specific ATLAS and CMS papers reporting the triboson significances should be cited explicitly rather than generically.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the thorough review and constructive feedback. We appreciate the recognition of the work's potential significance and address each major comment below with revisions to improve verifiability and robustness.

read point-by-point responses

  1. Referee: [Results section] Results section: the central claim that ΔSM overpredicts triboson events (rendering it consistent but not preferred) is load-bearing and rests on fixing the triplet scalar mass to 152 GeV from the diphoton/Zγ/WW excesses. The manuscript does not supply the explicit Drell-Yan cross-section values, branching ratios for neutral/charged components, or acceptance corrections used to obtain the predicted yields; without these the overprediction cannot be verified and the stress-test concern on parameter transfer remains open.

    Authors: We agree that explicit numerical values are necessary for full verification of the overprediction. The triplet scalar mass is fixed to 152 GeV as the single relevant parameter, determined directly from the diphoton, Zγ, and WW excesses reported in the literature. Drell-Yan production cross sections for the neutral and charged components were obtained via standard electroweak Monte Carlo simulation at 13 TeV, branching ratios follow from the model's tree-level couplings to vector bosons (fixed by the Y=0 hypercharge assignment and the chosen mass), and acceptance factors were taken from the public ATLAS/CMS triboson analyses to ensure consistency with experimental selections. In the revised manuscript we will add these quantities explicitly (cross sections, branching ratios, and effective acceptances) in the Results section or a new appendix so that the predicted yields and the resulting mild tension with data can be reproduced directly. revision: yes

  2. Referee: [§3 (Triboson production and decay)] §3 (Triboson production and decay): the assumption that the same electroweak production and decay modes transfer without modification from the 152 GeV signals to VVZ/WWZ final states is not cross-checked against possible interference with SM amplitudes or differences in lepton acceptance; this directly affects whether the predicted excess is robust.

    Authors: The Drell-Yan production of the triplet scalars is a tree-level electroweak process, and the subsequent decays to vector bosons are likewise tree-level with branching ratios fixed by the model. SM triboson production at the same final-state multiplicity is loop-suppressed or higher-order, rendering interference with the resonant new-physics contribution negligible at the level relevant for current statistics. Lepton acceptances are taken from the experimental analyses whose signal regions are defined at a comparable mass scale; the kinematic similarity implies that acceptance differences remain small. To make this reasoning explicit, we will insert a concise paragraph in §3 of the revised manuscript justifying the transfer assumption and estimating the size of any residual acceptance variation. A dedicated interference simulation can be added if future data warrant it. revision: partial

Circularity Check

0 steps flagged

No load-bearing circularity; model parameters transferred from independent excesses to separate triboson observables

full rationale

The derivation fixes the triplet vev/mixing from the 152 GeV di-photon/Zγ/WW excesses (external ATLAS/CMS data) and computes expected Drell-Yan triboson rates in the standard ΔSM Lagrangian. This is a conventional parameter transfer and comparison to independent VVZ/WWZ data, not a self-definition or fitted-input prediction. No equations reduce the triboson prediction to the input by construction, and no self-citation chain is load-bearing for the central consistency statement. The paper remains self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

1 free parameters · 1 axioms · 1 invented entities

The central claim rests on the real Higgs triplet model with Y=0, whose parameters are constrained by the 152 GeV mass and decay patterns; the paper introduces no new entities beyond the standard triplet scalars.

free parameters (1)
  • triplet scalar mass
    Fixed at 152 GeV from the reported excesses; used to set production and decay rates.
axioms (1)
  • domain assumption The real triplet model with Y=0 produces scalars that decay dominantly to electroweak bosons.
    Invoked to link Drell-Yan production to triboson final states.
invented entities (1)
  • real Higgs triplet scalars no independent evidence
    purpose: To explain the 152 GeV excesses and enhance triboson rates.
    Standard extension of the SM Higgs sector; no new independent evidence provided beyond consistency with existing data.

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Reference graph

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