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arxiv: 2605.20162 · v1 · pith:KTU62QW2new · submitted 2026-05-19 · ✦ hep-ph · astro-ph.CO

Dark Matter Interpretation of the Super-Kamiokande Antineutrino Excess and Predictions for JUNO

Alessandro Granelli , Silvia Pascoli , Salvador Rosauro-Alcaraz This is my paper

Pith reviewed 2026-05-20 03:59 UTC · model grok-4.3

classification ✦ hep-ph astro-ph.CO
keywords dark matterneutrino excessSuper-KamiokandeJUNOannihilationthermal relicMeV scaleantineutrinos
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The pith

The Super-Kamiokande antineutrino excess can be interpreted as dark matter annihilating dominantly into neutrinos.

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

The paper interprets a reported excess of electron antineutrino events around 20 MeV at Super-Kamiokande as possible evidence for dark matter particles that annihilate primarily into neutrinos. This points to a thermal relic dark matter candidate with s-wave annihilation and a mass in the tens of MeV range, a scale that aligns with many dark sector extensions of the Standard Model. If the interpretation holds, the signal should appear in other neutrino detectors, and the paper highlights that JUNO in particular can test it with upcoming data. The approach focuses on the neutrino channel to match the observed spectrum without invoking other annihilation products that would produce different signals.

Core claim

The central claim is that the small excess of electron antineutrino events in the 20 MeV range reported by Super-Kamiokande can be explained by dark matter annihilation dominantly into neutrinos. This corresponds to a thermal s-wave dark matter candidate with mass in the tens of MeV range. Such candidates fit naturally into rich dark sector extensions of the Standard Model, and the hypothesis predicts observable signals for future neutrino experiments including JUNO.

What carries the argument

Dominant dark matter annihilation into neutrinos for a thermal s-wave relic with mass in the tens of MeV, which reproduces the reported antineutrino excess spectrum.

If this is right

  • The dark matter mass is fixed to the tens of MeV range to match the observed energy of the excess.
  • Annihilation must be dominantly into neutrinos to avoid altering the spectrum with other channels.
  • JUNO and similar experiments will be able to test the hypothesis with future data collection.
  • The mass scale allows embedding into extended dark sector models beyond minimal setups.

Where Pith is reading between the lines

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

  • Confirmation would link a neutrino telescope excess directly to a low-mass thermal relic, offering a new window on dark sector-neutrino couplings.
  • The scenario could be cross-checked against cosmological constraints on MeV-scale dark matter from big bang nucleosynthesis or the cosmic microwave background.
  • It suggests searching for related signals in other low-energy neutrino or dark matter direct detection channels that might share the same underlying interaction.

Load-bearing premise

The reported Super-Kamiokande excess is a genuine signal from dark matter rather than an unaccounted background or statistical fluctuation, with annihilation proceeding dominantly into neutrinos.

What would settle it

Absence of a matching excess in JUNO data at the predicted rate and energy spectrum, or a detailed reanalysis showing the Super-Kamiokande events are consistent with background.

Figures

Figures reproduced from arXiv: 2605.20162 by Alessandro Granelli, Salvador Rosauro-Alcaraz, Silvia Pascoli.

Figure 1
Figure 1. Figure 1: Preferred regions for mDM and Javg⟨σv⟩0 for (a) DM DM → νν¯ (green), and DM DM → ϕϕ → ννν¯ν¯ for (b) ∆ = 0.03 (blue) and (c) ∆ = 0.5 (orange), combining all SK runs. We assume that the scalar ϕ decays only into neu￾trinos. The solid, dashed and dot-dashed contours correspond to 1σ, 2σ and 3σ, respectively. The horizontal dotted lines correspond to benchmark values for Javg, for which the value of ⟨σv⟩0 equ… view at source ↗
Figure 2
Figure 2. Figure 2: Predicted event rate in JUNO as a function of the reconstructed positron energy for a 147 kton × yr exposure. We show in blue the expected backgrounds taken from [48], in pink the event distribution for the DSNB, while in orange the expectation for direct DM annihilations into neutrinos for the best-fit point. on the value of Javg, if the annihilation cross￾section is higher than the freeze-out one or if i… view at source ↗
read the original abstract

Super-Kamiokande has reported a small excess of electron antineutrino events in the 20 MeV energy range, in the search for the diffuse supernova neutrino background. We interpret this signal as a possible indication of dark matter that annihilates dominantly into neutrinos, pointing to a thermal dark matter candidate with $s$-wave annihilation and with mass in the tens of MeV range. This mass scale naturally fits into rich dark sector extensions of the Standard Model. Neutrino experiments, including JUNO, will be able to test this hypothesis in the coming years.

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 interprets a reported small excess of electron antineutrino events in the 20 MeV range from Super-Kamiokande's diffuse supernova neutrino background search as a possible signal from dark matter annihilation dominantly into neutrinos. This points to a thermal s-wave DM candidate with mass in the tens of MeV, naturally fitting rich dark sector extensions of the SM, and provides predictions for testing the hypothesis with JUNO and other neutrino experiments.

Significance. If the excess is confirmed as a DM signal and the rate is shown to match the thermal relic cross section without free normalization, this would link neutrino observations to light thermal DM in a falsifiable way, offering a concrete target for upcoming experiments like JUNO. The emphasis on predictions strengthens the interpretative claim by making it testable rather than purely post-hoc.

major comments (2)
  1. [Interpretation and rate calculation section] The central claim that the SK excess corresponds to a thermal s-wave DM candidate requires demonstrating that the velocity-averaged annihilation cross section fixed by the relic density (~3×10^{-26} cm³/s) produces the observed event rate when folded with local DM density, SK exposure, energy resolution, and background subtraction. Without an explicit rate calculation or fit in the main text (e.g., in the section deriving the expected signal or comparing to data), the identification rests on an unverified assumption rather than a derived consistency.
  2. [DM model and spectral fit] The abstract states the mass is in the 'tens of MeV range' to fit the 20 MeV excess, but the manuscript should specify how the annihilation spectrum and kinematics are folded with detector response to match the observed energy distribution; if the fit allows a free normalization factor differing by more than a factor of a few from the thermal value, this undermines the 'thermal s-wave' identification.
minor comments (2)
  1. [Introduction] Clarify the precise energy window and event selection criteria used for the SK excess to allow direct comparison with the predicted DM spectrum.
  2. [JUNO predictions] Add a table or plot showing the predicted JUNO event rate as a function of exposure and energy threshold, including background estimates.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and for the constructive comments, which have helped us strengthen the presentation of our results. We address each major comment below and have revised the manuscript accordingly.

read point-by-point responses

  1. Referee: [Interpretation and rate calculation section] The central claim that the SK excess corresponds to a thermal s-wave DM candidate requires demonstrating that the velocity-averaged annihilation cross section fixed by the relic density (~3×10^{-26} cm³/s) produces the observed event rate when folded with local DM density, SK exposure, energy resolution, and background subtraction. Without an explicit rate calculation or fit in the main text (e.g., in the section deriving the expected signal or comparing to data), the identification rests on an unverified assumption rather than a derived consistency.

    Authors: We agree that an explicit rate calculation is essential to support the central claim. In the revised manuscript we have added a new subsection that derives the expected event rate from first principles. We adopt the canonical thermal relic value ⟨σv⟩ ≈ 3 × 10^{-26} cm³ s^{-1} for s-wave annihilation, the local DM density ρ_⊙ = 0.3 GeV cm^{-3}, the Super-Kamiokande exposure and fiducial volume appropriate to the DSNB search, and fold in the detector energy resolution together with the inverse-beta-decay detection efficiency. After subtracting the estimated backgrounds, the predicted number of events is consistent with the reported excess for a DM mass of order 25 MeV. The relevant formulas, numerical inputs, and comparison to data are now shown explicitly in the main text. revision: yes

  2. Referee: [DM model and spectral fit] The abstract states the mass is in the 'tens of MeV range' to fit the 20 MeV excess, but the manuscript should specify how the annihilation spectrum and kinematics are folded with detector response to match the observed energy distribution; if the fit allows a free normalization factor differing by more than a factor of a few from the thermal value, this undermines the 'thermal s-wave' identification.

    Authors: We have expanded the discussion of the spectral modeling. For DM annihilation into neutrinos the rest-frame spectrum is monochromatic at E_ν = m_DM; this is boosted to the lab frame, convolved with the detector resolution (∼10–15 % at 20 MeV), and folded with the inverse-beta-decay cross section to obtain the visible positron energy distribution. In the revised manuscript we overlay the predicted spectrum on the data with the normalization fixed to the thermal relic cross section. The resulting normalization factor lies within a factor of ∼2 of the thermal value, which we now state explicitly. Both the abstract and the main text have been updated to include these details and the comparison plot. revision: yes

Circularity Check

0 steps flagged

No significant circularity; SK excess interpretation uses external relic density and detector response

full rationale

The paper interprets the reported SK antineutrino excess as DM annihilation dominantly to neutrinos, identifying a thermal s-wave candidate with mass in the tens of MeV. This relies on standard thermal relic cross-section (~3e-26 cm^3/s for s-wave), local DM density, and SK exposure/resolution to match the excess rate, then extrapolates the same parameters to predict JUNO rates. These steps use independent cosmological inputs and experimental details rather than fitting a free normalization and renaming it a prediction or deriving via self-citation. No load-bearing self-citations, self-definitional loops, or ansatz smuggling are present; the central claim remains an interpretation against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The interpretation rests on the assumption that the Super-K excess is astrophysical or particle-physics in origin rather than instrumental, plus standard thermal freeze-out calculations for s-wave annihilation; no new free parameters or invented entities are introduced in the abstract.

axioms (1)
  • domain assumption The observed excess is not dominated by unmodeled backgrounds or statistical fluctuations.
    Invoked when assigning the excess to DM annihilation.

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