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Two ground-based gamma-ray surveys set the tightest lifetime bounds yet on PeV-scale decaying dark matter

Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →

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T0 review

2026-08-04 21:23 UTC pith:BAMBBCIP

load-bearing objection Solid, standard limits paper; the LHAASO half is genuinely new, but the 'most stringent to date' claim needs a bracketed background systematic and resolution of the Boehm overlap. the 2 major comments →

arxiv 2509.08039 v2 pith:BAMBBCIP submitted 2025-09-09 hep-ph astro-ph.CO

Breaking Dark: Hunting Heavy Decaying Dark Matter with Tibet AS_γ and LHAASO-KM2A

Abhishek Dubey , Akash Kumar Saha This is my paper
classification hep-ph astro-ph.CO
keywords dark matter decayPeV dark matterdiffuse gamma-ray backgroundTibet ASγLHAASO-KM2Ainverse Compton emissionlifetime limitsindirect detection
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

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

The paper uses the Tibet ASγ upper limit on high-latitude diffuse gamma rays and the LHAASO-KM2A measurement of Galactic-plane diffuse emission from 10 TeV to 1 PeV to constrain decaying dark matter with masses around 10^6 to 10^9 GeV. The authors compute the full gamma-ray signal, including prompt photons, inverse-Compton emission from decay-produced electrons and positrons, and extragalactic components, and compare it to these datasets. Their main claim is that for several decay channels the new observations exclude lifetimes shorter than roughly 10^28 seconds for leptonic final states and somewhat weaker values for hadronic channels, surpassing previous limits from IceCube, KM3NeT, LHAASO, and Fermi-LAT. If correct, this sharply narrows the allowed decay lifetime for heavy dark matter models.

Core claim

On the paper's own terms, the core result is a set of 95% C.L. lower bounds on the lifetime of decaying dark matter derived from the Tibet ASγ high-latitude upper limit and the LHAASO-KM2A spectral and longitudinal measurements. For χ→e+e− the bounds reach several times 10^28 seconds in the 10^6–10^9 GeV mass range; for hadronic and gauge-boson channels they are slightly weaker but still competitive. The authors show that the inner Galactic-plane LHAASO data give stronger limits than the outer region, that the limits vary by only about 2% among NFW, Einasto, and isothermal halo profiles, and that the choice of astrophysical background model can change the LHAASO-derived bounds by up to a fac

What carries the argument

The analysis is built on the total gamma-ray flux from dark matter decay, split into four components: Galactic prompt, Galactic inverse-Compton, extragalactic prompt, and extragalactic inverse-Compton. Prompt spectra are computed with HDMSpectra; the inverse-Compton contribution uses the full Klein–Nishina kernel with CMB, starlight, and infrared photon backgrounds; the diffusion halo function is set to unity because energy losses dominate at multi-TeV electron energies. The LHAASO constraint comes from a χ² fit of the sum of a fixed astrophysical background model and the dark-matter signal to the measured flux, with the 95% confidence limit taken from Δχ² = 2.71. The Tibet constraint uses t

Load-bearing premise

The LHAASO-derived bounds treat the Chen et al. model of ordinary gamma-ray emission from the Galactic plane as exactly known, subtracting it before any dark matter signal; if this astrophysical background is mis-modeled, the quoted lifetimes shift by up to a factor of five.

What would settle it

A direct test would be an independent, source-by-source census of the Galactic plane at 10 TeV to 1 PeV: if the LHAASO diffuse excess is fully explained by resolved astrophysical sources such as pulsar halos and PeVatron cocoons, the residual room for dark matter shrinks and the lifetime bounds weaken by about the factor of five the paper reports from background-model changes. Conversely, if the excess persists after such a census and matches the Chen et al. model only with a dark matter component, the quoted bounds would be validated and potentially strengthened.

Watch this falsifier. Get emailed when new claim-graph text bears on it.

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If this is right

  • Dark matter in the 10^6–10^9 GeV range decaying mostly to e+e− must have a lifetime above several times 10^28 seconds, excluding many short-lived heavy dark matter models.
  • Hadronic and gauge-boson channels receive competitive lifetime bounds that improve on earlier IceCube, KM3NeT, Fermi-LAT, and LHAASO limits in parts of the mass range.
  • The inner Galactic-plane LHAASO dataset gives stronger constraints than the outer region because the dark matter density is higher toward the Galactic center.
  • The lifetime limits change by only about 2% across NFW, Einasto, and isothermal halo profiles, so the constraints are robust to halo profile uncertainty.
  • Future LHAASO-WCDA and KM2A measurements, with a better diffuse background model, could strengthen these bounds or uncover a signal.

Where Pith is reading between the lines

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

  • The factor-of-five dependence on the assumed diffuse background means the headline 'most stringent' claim is conditional on the Chen et al. model being correct; a future revision of the diffuse emission could move the quoted bounds by that factor.
  • If the LHAASO excess above the canonical background is eventually explained by unresolved astrophysical sources such as pulsar halos or PeVatron cocoons, the room for a dark matter contribution shrinks and the lifetime limits would weaken.
  • Applying the same pipeline to LHAASO-WCDA data at 1–25 TeV, where cascaded gamma rays from dark matter decay become relevant, could extend the constraints to lower masses.
  • For models with multiple decay channels, the single-channel limits rescale with branching ratios, so a model with subdominant leptonic branching could evade the strongest quoted bounds.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

2 major / 3 minor

Summary. The paper derives 95% CL lower limits on the lifetime of decaying dark matter in the 10^6--10^9 GeV mass range from two datasets: the Tibet ASgamma high-latitude diffuse gamma-ray upper limits of Neronov et al. [51] and the LHAASO-KM2A Galactic-plane diffuse gamma-ray spectral and angular measurements [50]. The signal is modeled with Galactic and extragalactic prompt and inverse-Compton components, using HDMSpectra for decay spectra, an NFW profile, and full Klein--Nishina IC losses. The LHAASO analysis uses the Chen et al. [64] diffuse background as a fixed model; the paper compares this with the LHAASO 'naive' background and finds up to a factor of about five variation in the limits. The authors claim the resulting bounds surpass previous IceCube/KM3NeT/LHAASO/Fermi-LAT limits for several channels.

Significance. If the constraints stand, this is a useful and timely update in a mass range where air-shower gamma-ray telescopes are becoming competitive. The calculation is largely standard and internally consistent: it uses the publicly available HDMSpectra package, includes all four prompt/IC components, and explicitly tests angular data, density-profile dependence, and background-model dependence. The main weakness is that the headline comparative claim rests on a single fixed background model for LHAASO-KM2A, and the factor-of-five background variation shown in the paper is not propagated into the quoted limits. Because previous limits often lie only a factor of a few above the new curves, the central claim is not yet bracketed. This is fixable within the scope of the paper, either by quoting an envelope over background models or by softening the 'most stringent' claim.

major comments (2)
  1. [Section IV, Fig. 5 (right); Section III.B] The claim that the LHAASO-KM2A data give the most stringent constraints to date is conditional on the adopted diffuse background. The authors fix the Chen et al. [64] background, but Fig. 5 (right) shows that switching to the LHAASO 'naive' background changes the lifetime limits by up to a factor of about five. Since the previous combined limits in Figs. 1, 4, and 6 are only a factor of a few to ten above the new curves over much of the mass range, a factor-of-five background dependence can decide whether the new limits actually surpass the previous ones. Comparing two models is not an uncertainty budget for the true diffuse emission, and the statement that the benchmark model yields the most conservative bounds is relative only to those two choices. Please propagate this systematic into the quoted 95% limits (e.g., a bracketed envelope or nuisance parameters in Eq. (15)), or soften the
  2. [Section III.A, Eq. (14)] The Tibet ASgamma leg uses the criterion Phi_DM > Phi_UL in any energy bin, but the paper does not specify how the direction-dependent flux from Eq. (1) is averaged over the high-latitude region |b|>20 deg used by Ref. [51], nor which energy bins are adopted. The Neronov et al. limit already includes an exposure/mask, so the model flux must be convolved with the same sky region. Without this detail, the purple curves in Figs. 1, 4, and 6 are not reproducible. Since this is one of the two datasets supporting the headline claim, the region-averaging and binning should be stated explicitly.
minor comments (3)
  1. [Note added, Section V] The 'Note added' mentions a work by Boehm et al. but gives no reference or discussion. Either cite the work or remove the note.
  2. [Fig. 3 caption] The caption says 'the peak in the astrophysical model at around 80 deg latitude'; since the horizontal axis is Galactic longitude, this should be 'longitude'.
  3. [Section V] Typo: 'annhilation' should be 'annihilation'.

Circularity Check

0 steps flagged

No significant circularity; derivation is self-contained and the only self-citation is non-load-bearing.

full rationale

The paper's derivation chain is self-contained: gamma-ray spectra are taken from the external HDMSpectra code, astrophysical backgrounds are adopted from external models (Neronov et al. for Tibet, Chen et al. and the LHAASO 'naive' model for KM2A), and the DM flux is computed from standard line-of-sight integrals without fitting any parameter that is then renamed a prediction. The only self-citation, Ref. [76], appears in a list of previous limits used for comparison in Figs. 1, 4, and 6; it is not used to derive any new bound, so it is not load-bearing. The paper explicitly demonstrates the dependence of the LHAASO-KM2A limits on the background model in Fig. 5 (up to a factor of ~5) and adopts the more conservative choice, which is a model systematic rather than a circular reduction. No equation is defined in terms of the claimed result, and no known result is renamed as a new prediction.

Axiom & Free-Parameter Ledger

0 free parameters · 5 axioms · 0 invented entities

The paper introduces no new fitted constants and no new particles or forces. Its inputs are external: HDMSpectra decay spectra, a standard NFW profile, galactic radiation fields, and a published diffuse background model. The only parameter being constrained is the dark matter lifetime itself. The assumptions above are the load-bearing external premises, with the Chen et al. background being the most fragile.

axioms (5)
  • domain assumption NFW dark matter density profile with rs=20 kpc, rho_s=0.318 GeV/cm^3, R_sun=8.3 kpc
    Used in Eqs. (2)-(3) for Galactic prompt and IC flux. The paper checks Einasto and isothermal profiles and finds less than about 2% variation, so the dependence is weak.
  • domain assumption Diffusion halo function I_diff is effectively unity at multi-TeV electron energies
    Invoked after Eq. (10) in Section II.B, citing Refs. [61,68]. If spatial diffusion of the e+/- population is significant, the IC flux would change.
  • domain assumption The Chen et al. [64] astrophysical background model correctly describes the LHAASO diffuse gamma-ray emission
    Used as a fixed background in the chi-square analysis in Section III.B. The paper shows limits vary by a factor of about five under alternative backgrounds, so this is load-bearing.
  • domain assumption Extragalactic electromagnetic cascades contribute negligibly above 10 TeV
    Stated in Section II.C. Omitting the cascade makes the DM signal smaller, so the resulting limits are conservative for this component.
  • domain assumption 100% branching ratio into each individual Standard Model final state
    Section V states this explicitly; realistic multi-channel models require rescaling the bounds, which limits their direct applicability to full dark matter models.

reviewed 2026-08-04 · how reviews work

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Cite this review

Pith. "Pith review of Breaking Dark: Hunting Heavy Decaying Dark Matter with Tibet AS$_\gamma$ and LHAASO-KM2A." pith.science (2026). https://pith.science/paper/BAMBBCIP

@misc{pith2026250908039,
  author       = {Pith},
  title        = {Pith review of: Breaking Dark: Hunting Heavy Decaying Dark Matter with Tibet AS$_\gamma$ and LHAASO-KM2A},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/BAMBBCIP}},
  note         = {Machine review of arXiv:2509.08039}
}
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read the original abstract

Recent measurements of diffuse sub-PeV gamma-rays by the Tibet AS$_\gamma$ and LHAASO collaborations have reshaped our understanding of the gamma-ray sky. Besides uncovering the nature of `PeVatrons', these measurements can also be used to probe the non-gravitational nature of dark matter. PeV-scale decaying dark matter can produce high-energy gamma rays in the final state and contribute to the measurements made by extensive air-shower detectors like Tibet AS$_\gamma$ and LHAASO. Using the latest Tibet AS$_\gamma$ upper limits on diffuse gamma rays away from the Galactic plane and the LHAASO-KM2A measurements of diffuse gamma rays from the Galactic plane, we put stringent constraints on lifetimes of decaying DM for masses $\sim 10^6 - 10^9$ GeV. Future observations of high-energy diffuse gamma-ray emission can thus provide stronger limits or potentially discover heavy decaying dark matter.

Figures

Figures reproduced from arXiv: 2509.08039 by Abhishek Dubey, Akash Kumar Saha.

Figure 1
Figure 1. Figure 1: Upper limits on DM lifetime, τχ, as a function of its mass mχ for the decay channel χ → e +e −. Our limits from Tibet ASγ (Neronov et al.) [51] and LHAASO￾KM2A [50] datasets are shown by the purple solid and green solid lines, respectively. The excluded regions lie below the curves. Previous combined best bound in the parameter space is taken from Refs. [52–60] (orange dashed line). flux away from the Gala… view at source ↗
Figure 2
Figure 2. Figure 2: Differential gamma-ray flux as a function of photon energies for the DM decay channel [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Energy integrated gamma-ray flux as a function of photon energies for the DM decay channel [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Upper limits on DM lifetime for the decay channel [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: (Left panel) Comparison of our bounds from analyzing the spectral datasets (teal solid line) and angular datasets (blue solid line) from LHAASO-KM2A measurement [50]. For spectral data, we use our benchmark limit from [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Bounds on DM lifetime for different DM decay channels. Our bounds from Tibet AS [PITH_FULL_IMAGE:figures/full_fig_p013_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Bounds on DM lifetime for different DM decay channels. Our bounds from Tibet AS [PITH_FULL_IMAGE:figures/full_fig_p014_7.png] view at source ↗

discussion (0)

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Forward citations

Cited by 2 Pith papers

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    Gamma-ray upper limits from five high-energy observatories constrain the annihilation cross sections of composite dark matter in the mass range 10^5--10^12 GeV.

  2. Constraints on Ultra-heavy DM from TeV-PeV gamma-ray diffuse measurements

    astro-ph.HE 2025-09 conditional novelty 5.0

    HAWC and LHAASO diffuse gamma-ray data, modeled with prompt, inverse-Compton, absorption, and astrophysical background, produce the strongest constraints on decaying ultra-heavy dark matter above ~100 TeV.

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This paper was first reviewed by deepseek-v4-flash on August 4, 2026.