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arxiv: 2605.07303 · v1 · submitted 2026-05-08 · ✦ hep-ph · hep-ex

Recognition: 2 theorem links

· Lean Theorem

LHC Mono-W/Z Signatures as a Probe for Dark Matter Explanations of Astrophysical Excesses

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Pith reviewed 2026-05-11 01:29 UTC · model grok-4.3

classification ✦ hep-ph hep-ex
keywords inert doublet modeldark matter annihilationmono-W/Z signaturesGalactic Center excessantiproton anomalyLHCmass splittingHigh-Luminosity LHC
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0 comments X

The pith

LHC mono-W/Z searches can test most of the inert doublet dark matter space explaining the galactic excesses

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

The paper establishes that mono-W/Z signatures provide a powerful probe for the inert two-Higgs doublet model in the regime where dark matter particles of 70 to 75 GeV annihilate to off-shell W bosons. This regime is chosen because it can simultaneously account for the Galactic Center gamma-ray excess and the AMS-02 antiproton anomaly while satisfying other constraints. The authors introduce a strategy to separate the impacts of neutral and charged mass splittings in the collider signals. A sympathetic reader cares because this offers an independent test at the LHC for a dark matter explanation that relies on astrophysical data. If correct, future LHC runs will exclude large portions of the remaining viable space.

Core claim

In the inert two-Higgs doublet model the parameter space with dark matter mass 70-75 GeV and dominant SS to WW star annihilation that fits both the galactic center excess and antiproton anomaly can be tested using LHC mono-W/Z plus missing energy searches. A channel separation strategy allows disentangling the contributions from neutral mass splitting Delta zero and charged mass splitting Delta plus minus. At the High-Luminosity LHC this leads to 2 sigma exclusion limits of 80 to 260 GeV on Delta zero from the leptonic channel and 30 to 150 GeV on Delta zero plus 70 to 230 GeV on Delta plus minus from the hadronic channel for a 70 GeV dark matter particle.

What carries the argument

The mono-W/Z plus missing transverse energy signatures at the LHC with a dedicated channel-separation strategy for distinguishing neutral and charged mass splittings in the inert scalars.

Load-bearing premise

The galactic center excess and antiproton anomaly are due to dark matter annihilation in the inert two-Higgs doublet model via the SS to WW star channel in the 70-75 GeV range with no other dominant contributions.

What would settle it

A lack of mono-W/Z events in the relevant signal regions at the High-Luminosity LHC within the mass splitting ranges of 30 to 260 GeV would rule out this dark matter explanation for the astrophysical excesses.

Figures

Figures reproduced from arXiv: 2605.07303 by Chih-Ting Lu, Ying-Xin Li, Yu-Chen Guo.

Figure 1
Figure 1. Figure 1: FIG. 1. Representative Feynman diagrams for the signal process [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Production cross-sections for [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Cross sections for mono- [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Normalized invariant mass distributions of the dilep [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Normalized distributions of the leading lepton trans [PITH_FULL_IMAGE:figures/full_fig_p006_6.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Normalized distributions of the missing transverse [PITH_FULL_IMAGE:figures/full_fig_p006_5.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Expected statistical significance [PITH_FULL_IMAGE:figures/full_fig_p007_7.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. Normalized distributions of the transverse energy [PITH_FULL_IMAGE:figures/full_fig_p008_9.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11. Contours of statistical significance [PITH_FULL_IMAGE:figures/full_fig_p009_11.png] view at source ↗
read the original abstract

The inert two-Higgs doublet model (IDM) is a compelling framework for weakly interacting massive particles (WIMPs) linked to electroweak symmetry breaking. It can account for both the Galactic Center gamma-ray excess (GCE) and the AMS-02 antiproton anomaly while also satisfying relic density and direct detection constraints for dark matter (DM) masses in the $55-75$ GeV range. Three specific DM annihilation channels can be identified: Higgs resonance, $SA$ co-annihilation, and $SS\to WW^{\ast}$ annihilation. Among these, the DM mass range of $70-75$ GeV with dominant $SS\to WW^{\ast}$ annihilation has received less attention in collider searches. To validate this parameter space, we combine LHC searches for mono-$W/Z$ signatures. In particular, we develop a channel-separation strategy to disentangle the contributions of charged mass splitting ($\Delta^{\pm}$) and neutral mass splitting ($\Delta^0$) in the inert scalar sector at the LHC. Our results indicate that most of the parameter space consistent with these astrophysical anomalies in the $SS\to WW^{\ast}$ annihilation regime will be testable at the High-Luminosity LHC. Specifically, from the leptonic channel we obtain a $2\sigma$ exclusion limit of $80 \lesssim \Delta^0 \lesssim 260$ GeV, while the hadronic channel yields $30 \lesssim \Delta^0 \lesssim 150$ GeV and $70 \lesssim \Delta^{\pm} \lesssim 230$ GeV for $m_S = 70$ GeV.

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 / 2 minor

Summary. The paper claims that the inert doublet model (IDM) parameter space with m_S = 70-75 GeV, where SS → WW* annihilation explains the Galactic Center Excess and AMS-02 antiproton anomaly while satisfying relic density and direct detection bounds, can be tested via mono-W/Z signatures at the LHC. A channel-separation strategy using leptonic and hadronic final states is developed to disentangle the neutral mass splitting Δ⁰ and charged mass splitting Δ±, yielding 2σ exclusion limits at the High-Luminosity LHC of 80 ≲ Δ⁰ ≲ 260 GeV (leptonic), and 30 ≲ Δ⁰ ≲ 150 GeV with 70 ≲ Δ± ≲ 230 GeV (hadronic) for m_S = 70 GeV.

Significance. If the projections hold, the work provides a direct collider test of astrophysically motivated DM explanations in the IDM, bridging indirect detection signals with LHC phenomenology. The channel-separation method is a useful technical contribution for isolating effects of the two mass splittings in the inert sector. The analysis follows standard recast procedures for mono-W/Z searches, rendering the limits falsifiable with HL-LHC data.

minor comments (2)
  1. Abstract: the quoted 2σ limits are presented without any mention of the Monte Carlo tools, background modeling, or systematic uncertainties employed; a one-sentence summary of these elements would strengthen the abstract and allow readers to assess robustness immediately.
  2. The manuscript would benefit from an explicit statement (perhaps in the introduction or results section) of how the leptonic and hadronic channels are combined to break the degeneracy between Δ⁰ and Δ±, including any assumptions about signal efficiencies or cut optimization.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive evaluation of our manuscript, the accurate summary of our results on mono-W/Z signatures in the IDM, and the recommendation for minor revision. We appreciate the recognition that our channel-separation strategy provides a useful technical contribution for testing astrophysically motivated DM explanations at the HL-LHC. As no specific major comments were raised in the report, we have no point-by-point responses to provide below. We will incorporate any minor suggestions into the revised version of the manuscript.

Circularity Check

0 steps flagged

No significant circularity identified

full rationale

The paper's derivation chain consists of two independent parts: (1) adopting the IDM parameter space (m_S ≈ 70-75 GeV, SS→WW* regime) that is already consistent with GCE and AMS-02 excesses from external astrophysical fits, and (2) performing a standard recast of mono-W/Z searches at the LHC/HL-LHC to project 2σ exclusion limits on the free parameters Δ⁰ and Δ± via a channel-separation strategy that combines leptonic and hadronic final states. The collider projections treat the mass splittings as independent inputs and do not derive them from the astrophysical data; no equation reduces a claimed prediction to a fitted quantity by construction, and no load-bearing step relies on a self-citation chain whose validity is internal to the present work. The overall result is therefore a conditional reach estimate rather than a closed loop.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 1 invented entities

The central claim rests on the IDM being a valid extension of the Standard Model, on the astrophysical excesses being attributable to DM annihilation, and on standard LHC background modeling assumptions. No new particles beyond the inert scalars are introduced.

free parameters (2)
  • m_S
    Dark matter mass fixed near 70 GeV to simultaneously satisfy relic density, direct detection, and astrophysical excess fits.
  • Δ⁰ and Δ±
    Neutral and charged mass splittings treated as free parameters whose ranges are constrained by the proposed LHC search.
axioms (2)
  • domain assumption The IDM scalar potential and Z2 symmetry protect the lightest inert scalar as stable DM.
    Standard assumption of the inert doublet model invoked to ensure DM stability.
  • domain assumption Standard Model backgrounds and detector effects are correctly modeled in the mono-W/Z channels.
    Required for translating simulated signal rates into exclusion limits.
invented entities (1)
  • Inert scalars S, A, H± no independent evidence
    purpose: Provide stable DM candidate and additional states that produce mono-W/Z signatures.
    These are the defining new fields of the established IDM; no independent evidence is supplied beyond the model itself.

pith-pipeline@v0.9.0 · 5610 in / 1708 out tokens · 35490 ms · 2026-05-11T01:29:07.879329+00:00 · methodology

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