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REVIEW 2 major objections 4 minor 53 references

Future lepton colliders can discover charged Higgs bosons with mass below half the collision energy at 5σ regardless of the Yukawa coupling, and very large neutrino telescopes extend the reach to heavier masses.

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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2026-08-01 08:52 UTC pith:VGFMYF3O

load-bearing objection Solid phenomenological comparison, but the neutrino-telescope sensitivity curves sit in parameter space that low-energy data almost certainly exclude, so the complementarity claim is not supported as it stands. the 2 major comments →

arxiv 2607.20963 v1 pith:VGFMYF3O submitted 2026-07-23 hep-ph astro-ph.HEhep-ex

Charged Higgs Search at Future Neutrino Telescope and Higgs Factory

YiCheng Dai , Wei Liao , Yi-Song Lu , Qi-Shu Yan This is my paper
classification hep-ph astro-ph.HEhep-ex
keywords charged Higgs bosonfuture lepton colliderneutrino telescoperesonant neutrino scatteringYukawa couplingdiscovery significanceHiggs factoryastrophysical neutrino flux
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.

This paper argues that the charged Higgs boson, a generic signature of an extended scalar sector, can be discovered with certainty in two complementary ways. At a future lepton collider, or Higgs factory, pair production through gauge interactions guarantees a 5σ signal for any charged Higgs lighter than half the beam energy, as long as it decays inside the detector, making the discovery essentially independent of the unknown Yukawa couplings. At a neutrino telescope with a detector volume near 10^3 km^3, ultra-high-energy electron antineutrinos can scatter resonantly off electrons to produce muon-track and cascade events, providing sensitivity in the heavy-mass region where the collider loses reach. The paper compares the two approaches across the parameter space and concludes that colliders generally offer better sensitivity, while very large neutrino telescopes are competitive and complementary for heavy charged Higgs masses.

Core claim

The central claim is that the charged Higgs boson can be searched for with high sensitivity at both future lepton colliders and future neutrino telescopes through two largely model-independent mechanisms. At a lepton collider with center-of-mass energy √s, charged Higgs pairs are produced via the gauge coupling γ/Z, so the production rate does not depend on the unknown Yukawa couplings; using double-sided reconstruction on the two decay chains (dijet and lepton-plus-missing-energy), the paper finds a statistical significance above 5σ for all masses below √s/2, provided the charged Higgs decays inside the detector. At a neutrino telescope, an incident ultra-high-energy electron antineutrino c

What carries the argument

The resonant s-channel process \barν_e + e^- → H^- → f\bar{f}' at neutrino telescopes, with the resonance energy set by E_res = m_{H±}^2/(2m_e); the peak cross section is independent of the Yukawa coupling because the width in the numerator and denominator cancel. This is complemented at colliders by the gauge-interaction pair-production e^+e^- → H^+H^- via γ/Z, reconstructed with the double-sided invariant-mass technique (m_jj and m_{\barνl l}), which makes the signal rate insensitive to the Yukawa couplings and yields a guaranteed 5σ significance in the pair on-shell region.

Load-bearing premise

The benchmark models are assumed to be experimentally viable even though they assign O(0.1–1) Yukawa couplings to electrons, muons, and first/second-generation quarks; the paper checks only LEP and LHC τν bounds, not low-energy flavor/rare-decay constraints such as K→μν, π→eν, and μ→eγ that could exclude the very parameter space probed.

What would settle it

Show that existing low-energy flavor and rare-decay measurements (K→μν, π→eν, μ→eγ) exclude the benchmark Yukawa couplings for m_{H±} between 80 and 350 GeV; if so, the parameter space on which both the collider and neutrino-telescope discovery projections are drawn does not exist.

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

If this is right

  • A future e+e- collider running at √s = 250–350 GeV can establish a 5σ charged Higgs discovery for any mass below roughly half the beam energy, independent of the Yukawa coupling, as long as the charged Higgs decays within roughly a meter of the interaction point.
  • A neutrino telescope with ~1000 km^3 effective volume and 10 years of exposure can reach comparable sensitivity for charged Higgs masses near and above 300 GeV, especially in models where the charged Higgs couples to first-generation fermions.
  • The muon-track channel at neutrino telescopes is the more powerful of the two event topologies, because the flat muon-energy spectrum creates a characteristic shoulder over the Standard Model background; the cascade channel is weaker but adds independent sensitivity.
  • The astrophysical neutrino flux uncertainty shifts the telescope reach noticeably, with the conservative cosmogenic flux giving better sensitivity for heavier masses because of the flux crossing around 50 PeV.
  • The collider and telescope strategies are complementary rather than redundant: the collider covers the light-mass region with high significance, while the telescope extends the probe to masses inaccessible to pair production.

Where Pith is reading between the lines

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

  • The benchmark models assign O(0.1–1) Yukawa couplings to electrons, muons, and first/second-generation quarks; the paper applies only LEP and LHC τν bounds, but low-energy flavor and rare-decay measurements (such as K→μν, π→eν, and μ→eγ) could independently exclude exactly this parameter space, which would invalidate the projected discovery curves for those benchmarks.
  • The 'guaranteed 5σ' at the collider is essentially an existence proof for a discovery channel, not a measurement of the charged Higgs properties; follow-up studies would be needed to extract the mass and couplings from the reconstructed invariant masses.
  • The resonant scattering mechanism is not specific to the charged Higgs: the same s-channel technique could be applied to other new-physics resonances coupling to electron–antineutrino pairs, so the paper's sensitivity projections provide a template for a broader class of searches at large-volume neutrino telescopes.
  • A combined analysis that includes the telescope's flux-model uncertainties and the collider's systematic uncertainties would likely strengthen the complementarity claim, since the two approaches are statistically independent (track vs. collider events).

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 / 4 minor

Summary. The paper studies the discovery potential of a charged Higgs boson in two simplified benchmark models (Models I and II) with a universal Yukawa coupling y, using two very different experimental settings: future neutrino telescopes (IceCube-Gen2, HUNT-like volumes) via resonant scattering of ultra-high-energy electron antineutrinos off electrons in the detector, and future lepton colliders (CEPC/FCC-ee) via charged-Higgs pair and associated production. For neutrino telescopes, the authors derive analytic cross sections for s-channel charged-Higgs production, include muon-track and cascade signatures, consider four astrophysical neutrino flux models and volumes from 100 to 5000 km^3, and obtain 3σ/5σ sensitivity contours in the (m_{H^±}, y) plane. For colliders, they perform LO MadGraph/Pythia/Delphes simulations for e+e− → ν̄_l l− + jets and study double-sided and single-sided reconstruction in the pair on-shell, single-resonant, and off-shell regions, including a 1% background systematic uncertainty. They conclude that future lepton colliders generally give better sensitivity over most of the considered parameter space, but that a neutrino telescope with very large volume can provide competitive and complementary sensitivity in the heavy-mass region.

Significance. If the central conclusion is accepted, the paper provides a useful quantitative comparison of two proposed discovery machines for charged scalars, with a transparent analytic treatment of the neutrino-telescope signal and a dedicated collider analysis. It goes beyond earlier IceCube charge-Higgs studies by combining track and cascade channels, scanning detector volume and flux models, and explicitly comparing with Higgs-factory projections. The analytic event-rate framework and the use of public generators for the collider part are strengths. The pair-production collider sensitivity is robust to the value of y as long as the scalar decays promptly in the detector, which is a clean and largely model-independent statement within the assumed fermionic-decay benchmark. However, the absolute neutrino-telescope sensitivities and the final comparison rest on two fragile assumptions: the benchmark models' viability under low-energy flavor constraints, and the omission of Earth attenuation, detector acceptance, and energy resolution. These issues must be addressed before the complementarity claim is established.

major comments (2)
  1. [Sec. II A (Eqs. (4)-(5)), Figs. 9-10 and 15-16] The benchmark Models I and II assign O(0.1-1) Yukawa couplings to electrons, muons, and first/second generation quarks. The paper applies only LEP and LHC τν constraints (Sec. III B). It does not apply low-energy flavor constraints, which are known to be severe for tree-level charged-scalar exchange. For example, a rough tree-level estimate for π→eν gives a deviation relative to the SM of order y^2 (v/m_H±)^2 m_π^2/(m_u+m_d); for y=0.3 and m_H±=200 GeV this is tens of percent, far above the measured precision. The 5σ neutrino-telescope curves in Fig. 10 require y>~0.3 for m_H±>~250 GeV. If such couplings are excluded by π/K/D decay data, the claimed heavy-mass complementarity corresponds to unphysical parameter space. This is a load-bearing external-validation gap: the authors should add the relevant low-energy constraints (or a conservative recasting) and show how much of the plotted re
  2. [Sec. II C (Eq. (16)), Figs. 9-10] The telescope sensitivity calculation assumes full-sky 4π acceptance, no Earth attenuation, and perfect detection efficiency and energy resolution. At the resonance energies relevant here (E_res ~ m_H±^2/(2m_e), e.g., ~50-120 PeV for m_H± ~250-350 GeV), Earth attenuation of upgoing neutrinos is not negligible; a 4π angular integral substantially overestimates the effective exposure. Since the 5σ thresholds in Fig. 10 are steep functions of y, a factor of a few in event rate can shift the inferred y sensitivity by a sizable amount, and the eventual collider-vs-telescope comparison in Figs. 15-16 is not demonstrated to be robust. A minimal bracketing (e.g., down-going-only or attenuation-corrected estimates) should be added.
minor comments (4)
  1. [Fig. 13 and Sec. III A] The text states that a decay-length cutoff of ~1 m is imposed, but Fig. 13 and Fig. 14 show flat cross sections and significances down to y=10^-6. For m_H±=100 GeV and y=10^-6, the decay length is O(20 m), so the acceptance would be strongly suppressed if the cutoff were applied. Please clarify whether the plotted points include the decay-length criterion or whether it is meant only to define the edge of the sensitivity region.
  2. [Fig. 2 and Sec. II A 1] The t-channel contribution is stated to be negligible near the s-channel resonance, and is then neglected throughout the analysis. For completeness, please state whether the t-channel was also checked at energies far below/above the resonance, since the flux-weighted event rate receives contributions from a broad energy range.
  3. [Sec. III C and Figs. 15-16] The phrase 'model-independent' for the collider claim should be qualified: the analysis assumes the charged Higgs decays only through the fermionic channels of Eqs. (4)-(5). If bosonic decays (e.g., H±→W±h) open up, the signal final state changes and the quoted 5σ reach does not directly apply.
  4. [References] Several bibliographic entries lack volume/page/year information (e.g., Refs. [17], [24], [25], [32], [35], [40]). Please bring the reference list to journal style.

Circularity Check

0 steps flagged

No circularity: benchmark Yukawas are scanned parameters, sensitivity curves solve the significance equation, and all external inputs are cited prior measurements.

full rationale

The derivation is self-contained in the sense relevant to circularity. Model I/II are defined by Lagrangians (Eqs. 1-5), with y an externally scanned parameter; widths and branching ratios in Eqs. (9)-(10) follow algebraically from those definitions, and the resonant cross sections (Eqs. 8, 11) are standard s-channel expressions. Sensitivity is defined in Eq. (20) as the y value for which the Poisson significance Z_A equals n; this is an inverse-significance projection, not a fitted-input prediction. Neutrino flux models (Eqs. 14-15 and IceCube-Gen2) are prior experimental fits imported as external inputs, not quantities derived from the charged-Higgs signal. Collider analyses use MadGraph/Pythia/Delphes with SM backgrounds and Cowan significance Eq. (27); the pair on-shell claim (>5σ whenever H± decays inside detector) is an MC output and is stated as being independent of y, so it does not reduce to an input. No load-bearing self-citations appear: refs. [17-20,23,24] are independent prior analyses, and no uniqueness theorem or ansatz is imported from the authors' own work. Limitations--extrapolated fluxes, omitted low-energy flavor constraints, and the phenomenological tau-decay kernels of Appendix A--are external-validity or modeling caveats, not circular steps.

Axiom & Free-Parameter Ledger

5 free parameters · 6 axioms · 0 invented entities

The central calculations depend on two benchmark Yukawa models, four input flux models, and several detector simplifications; these are external or assumed rather than derived. No new particle or entity is introduced beyond the standard charged Higgs of extended scalar sectors.

free parameters (5)
  • Universal Yukawa coupling y (Models I and II) = Benchmarks 0.14, 0.28; sensitivity thresholds up to ~1
    Central model parameter scanned to define 3σ/5σ sensitivity; not constrained within the paper except by LEP/LHC references.
  • Charged Higgs mass m_H± = 150, 250, 350 GeV for telescope benchmarks; collider scans at sqrt(s)=250/350 GeV
    Scanned mass; determines the resonance energy E_res=m_H^2/(2m_e) and the collider kinematics.
  • Collider background systematic uncertainty σ_B = 0.01
    Ad hoc choice in Eq. (27); reduces significance when background systematics are included.
  • Tau-energy response kernel parameters = κ=8, ⟨z⟩_e=1/3, ⟨z⟩_had=2/3, ⟨z⟩_μ=1/3
    Phenomenological Beta-kernel model introduced in Appendix A to approximate Pythia; not derived from data.
  • Energy binning choice = N_bin=20, 30, 40; 0.1-200 PeV
    Binning affects the cascade-channel significance because it controls resolution of the resonant peak; paper studies the dependence.
axioms (6)
  • ad hoc to paper Charged-Higgs benchmark Lagrangians, Eqs. (1)-(5), with universal Yukawa coupling y and no bosonic decays.
    Defines the branching ratios and width used for all signals; not derived from a UV-complete model.
  • domain assumption Astrophysical neutrino flux benchmark models are valid at Eν~10^7-10^8 GeV and can be extrapolated from lower energies.
    Event rates at the charged-Higgs resonance scale directly with the input flux at 10-100 PeV; the paper assumes four specific models cover the plausible range.
  • domain assumption Equal flavor ratio at Earth with ν:νbar = 1:1, so Φ_barν_e = Φ_νμ = Φ_total/6.
    Needed to obtain the initial-state antineutrino flux; stated in Sec. II B without uncertainty.
  • domain assumption Full-sky coverage, no Earth attenuation, unit detector efficiency, and E_dep≈E_ν for hadronic cascades.
    Simplifications in Sec. II C that raise expected event counts; the authors note them but do not quantify the resulting overestimate.
  • ad hoc to paper Models I and II are not already excluded by low-energy flavor physics (only LEP and LHC τν constraints are considered).
    The paper applies LEP and LHC τν limits in Sec. III B but does not evaluate K→μν, π→eν, μ→eγ, or other constraints on first/second-generation Yukawa couplings.
  • standard math SM background cross sections (Glashow W, NC/CC DIS, t-channel W) are taken from the cited literature and are accurate at these energies.
    Basis for all background event rates; assumed correct without re-derivation.

pith-pipeline@v1.3.0-alltime-deepseek · 23561 in / 17283 out tokens · 182853 ms · 2026-08-01T08:52:57.673925+00:00 · methodology

0 comments
read the original abstract

We investigate the discovery potential of the charged Higgs boson at future lepton colliders and neutrino telescopes within two simplified benchmark scenarios with universal Yukawa couplings. We demonstrate that both the muon-track and cascade events at neutrino telescopes can be exploited to search for or constrain the charged Higgs boson through resonant neutrino scattering process, and we compare the sensitivities obtained under different astrophysical neutrino flux models. We study the effect of the detector volume of neutrino telescopes on the discovery potential of the charged Higgs boson. We study the signal of charged Higgs boson at future lepton colliders over different kinematic regimes using optimized reconstruction strategies. We compare the discovery potential of the two experimental approaches over the relevant parameter space and find that future lepton colliders generally provide better sensitivity in most of the parameter space, while neutrino telescopes with very large detector volume can offer competitive and complementary sensitivity in the heavy-mass region of the charged Higgs boson.

Figures

Figures reproduced from arXiv: 2607.20963 by Qi-Shu Yan, Wei Liao, YiCheng Dai, Yi-Song Lu.

Figure 1
Figure 1. Figure 1: FIG. 1. Feynman diagrams for the charged Higgs induced [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Comparison of the charged Higgs resonant cross [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Feynman diagrams for the charged Higgs processes [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Differential cross sections as functions of the out [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Total cross sections for the charged Higgs hadronic [PITH_FULL_IMAGE:figures/full_fig_p005_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. All-flavor neutrino flux models used in this work. [PITH_FULL_IMAGE:figures/full_fig_p006_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Differential muon-track event rates, [PITH_FULL_IMAGE:figures/full_fig_p006_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. Differential rates for cascade events as functions of [PITH_FULL_IMAGE:figures/full_fig_p007_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. Sensitivities as functions of the charged Higgs mass [PITH_FULL_IMAGE:figures/full_fig_p008_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10. 5 [PITH_FULL_IMAGE:figures/full_fig_p009_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11. Feynman diagrams of the representative leading [PITH_FULL_IMAGE:figures/full_fig_p010_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: FIG. 12. Feynman diagrams of the representative single [PITH_FULL_IMAGE:figures/full_fig_p010_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: FIG. 13. Total cross sections for the [PITH_FULL_IMAGE:figures/full_fig_p011_13.png] view at source ↗
Figure 14
Figure 14. Figure 14: FIG. 14. Statistical significance of the process [PITH_FULL_IMAGE:figures/full_fig_p012_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: FIG. 15. 5 [PITH_FULL_IMAGE:figures/full_fig_p013_15.png] view at source ↗
Figure 16
Figure 16. Figure 16: FIG. 16. 5 [PITH_FULL_IMAGE:figures/full_fig_p013_16.png] view at source ↗
Figure 17
Figure 17. Figure 17: FIG. 17. Differential muon-track event rates, [PITH_FULL_IMAGE:figures/full_fig_p014_17.png] view at source ↗
Figure 18
Figure 18. Figure 18: FIG. 18. Differential rates for cascade events as func [PITH_FULL_IMAGE:figures/full_fig_p015_18.png] view at source ↗
Figure 19
Figure 19. Figure 19: FIG. 19. Differential rates for muon-track(upper panel) [PITH_FULL_IMAGE:figures/full_fig_p017_19.png] view at source ↗

discussion (0)

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Reference graph

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