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arxiv: 2411.11328 · v3 · submitted 2024-11-18 · ✦ hep-ph

Neutrino masses, anomalous magnetic moments and dark matter with vector-like fermions and an inert scalar doublet

Pith reviewed 2026-05-23 17:34 UTC · model grok-4.3

classification ✦ hep-ph
keywords neutrino massesanomalous magnetic momentsdark mattervector-like fermionsinert scalar doubletZ2 symmetryradiative generationlepton flavor violation
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0 comments X

The pith

A Z2-symmetric extension with two generations of vector-like fermions and an inert scalar doublet generates neutrino masses radiatively while also explaining electron and muon anomalous magnetic moments and the observed dark matter relic.

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

The paper introduces a beyond-Standard-Model extension motivated by neutrino masses, magnetic moment anomalies, and dark matter. It adds two generations of vector-like fermions and an inert scalar doublet, all odd under a Z2 symmetry. Neutrino masses and mixings arise from radiative loop diagrams with these fields, while the same loops generate the observed deviations in the electron and muon anomalous magnetic moments. The lightest Z2-odd state serves as dark matter whose thermal relic density matches observations. The construction stays consistent with lepton flavor violation limits, direct detection bounds, big bang nucleosynthesis, and cosmic microwave background data.

Core claim

The central claim is that a single Z2-odd sector consisting of two generations of vector-like fermions and an inert scalar doublet can simultaneously generate the observed neutrino mass spectrum and mixing angles through radiative corrections, produce the measured deviations in the electron and muon anomalous magnetic moments via loop contributions, and yield the correct thermal relic density for dark matter from the annihilation of the lightest Z2-odd state, all while remaining consistent with experimental bounds on lepton flavor violation, direct detection, big bang nucleosynthesis, and cosmic microwave background observations.

What carries the argument

The Z2 symmetry that forbids tree-level neutrino masses and stabilizes the dark matter candidate, together with the one-loop diagrams involving the vector-like fermions and inert doublet that generate both neutrino masses and magnetic moment corrections.

If this is right

  • Radiative neutrino masses are produced at the observed scale without requiring large tree-level Yukawa couplings.
  • The same new particles account for both the electron and muon anomalous magnetic moment deviations through shared loop diagrams.
  • The lightest Z2-odd particle furnishes a dark matter candidate whose annihilation cross section yields the measured relic abundance.
  • Parameter regions exist that avoid conflicts with lepton flavor violation searches and direct detection experiments.
  • Production of the new vector-like states at the LHC can yield testable signatures.

Where Pith is reading between the lines

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

  • The shared loop structure implies that adjustments to neutrino mixing angles could correlate with shifts in the predicted magnetic moment values.
  • Precision measurements at future neutrino experiments could indirectly constrain the dark matter annihilation rate in this setup.
  • Non-observation of vector-like fermions at the LHC would force the dark matter candidate mass into a narrower window testable by direct detection.
  • The radiative origin suggests that certain lepton flavor violating rates remain suppressed but could become accessible at next-generation facilities.

Load-bearing premise

Suitable masses and Yukawa couplings exist for the vector-like fermions and inert doublet such that the same loop diagrams simultaneously reproduce the correct neutrino mass scale, the measured magnetic moment deviations, and the observed dark matter relic density while satisfying all listed bounds.

What would settle it

A measurement of the muon anomalous magnetic moment that lies outside the narrow range of values allowed by the parameter choices needed to match both the neutrino oscillation data and the dark matter relic density would falsify the simultaneous explanation.

Figures

Figures reproduced from arXiv: 2411.11328 by Vandana Sahdev.

Figure 1
Figure 1. Figure 1: Running of couplings g1, g2 and g3 and their unification at 2-loop level, in terms of α −1 , in SM (dashed lines) vs the new model (solid lines). Blue, amber and green represent g1, g2 and g3, respectively. It may be noted that, in general, we can consider a variable number of generations for each of the new particles. However, it is observed that a good solution is considering one scalar doublet with two … view at source ↗
Figure 2
Figure 2. Figure 2: Feynman diagrams generating light neutrino masses at the 1-loop level. There are two [PITH_FULL_IMAGE:figures/full_fig_p012_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Feynman diagrams representing the process [PITH_FULL_IMAGE:figures/full_fig_p015_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Low energy observables ∆al , Br(lj → liγ) and µ → e conversion rate on Au are presented for 104 randomly generated parameter points (104 points for each observable). The points in red represent (∆ae, ∆aµ), the ones in violet represent (Br(µ → eγ), Br(τ → µγ)) and the ones in blue show µ → e conversion rate on Au. The experimental limit on Br(µ → eγ) is shown by the dashed line. The experimental limits Br(τ… view at source ↗
Figure 5
Figure 5. Figure 5: Relic density of the lightest exotic neutral fermion as DM, as a function of mass paramter [PITH_FULL_IMAGE:figures/full_fig_p026_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Cross-section (in pb) for the production of [PITH_FULL_IMAGE:figures/full_fig_p030_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Decay Cascades at MH1 (me N < me E < µΦ < me L) (top) and MH2 (me N < me L < me E < µΦ) (bottom). The quoted percentages indicate the corresponding branching ratio and include the conjugate process wherever allowed. Different colours are used only for better readability and do not follow any particular colour scheme. Only dominant (solid lines) and subdominant (dashed lines) decay modes have been shown. 7.… view at source ↗
read the original abstract

The beyond-the-standard-model scenario in this work is motivated from the observations of neutrino masses, anomalous magnetic moments of electron and muon, and dark matter in the Universe. We explain these observations by extending the standard model with two generations of vector-like fermions and an inert scalar doublet, all odd under a $Z_2$ symmetry. The light neutrino masses and mixings are generated radiatively while maintaining consistency with bounds on lepton flavor violation. Loop diagrams with the very same fields also serve to explain the anomalous magnetic moments. Similarly, the correct dark matter relic abundance is reproduced without coming into conflict with direct detection constraints, or those from big bang nucleosynthesis or the cosmic microwave observations. Finally, prospective signatures at the LHC are discussed.

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

1 major / 2 minor

Summary. The manuscript proposes a Z2-symmetric extension of the SM with two generations of vector-like fermions and an inert scalar doublet. It claims that one-loop diagrams involving these fields radiatively generate the observed neutrino masses and mixings while satisfying LFV bounds, that the same loops explain the electron and muon (g-2) anomalies, and that the inert doublet reproduces the observed DM relic density without violating direct detection, BBN, or CMB constraints. LHC signatures are also discussed.

Significance. If the numerical results establish viable overlapping parameter regions, the model would constitute a compact, multi-purpose BSM scenario linking three distinct phenomena through shared fields and loops. The radiative neutrino-mass mechanism and the reuse of the same particles for (g-2) and DM are standard but cleanly implemented features; explicit benchmark points or scans that simultaneously satisfy all observables would strengthen the case for a unified explanation.

major comments (1)
  1. [Numerical results / parameter scan section (presumably §5–6)] The central claim (abstract and §1) is that suitable values of the vector-like fermion masses, Yukawa couplings, and inert-doublet parameters exist such that the same loops simultaneously reproduce the neutrino mass scale, Δa_e, Δa_μ, and Ωh² ≈ 0.12 while obeying all listed bounds. The manuscript must therefore supply explicit benchmark points (or allowed regions from scans) with the numerical values of all relevant masses and couplings, together with the resulting predictions for neutrino masses, (g-2), relic density, and the most constraining observables (e.g., BR(μ→eγ), σ_SI). Without such concrete demonstration, the assertion that the requirements are compatible remains unverified.
minor comments (2)
  1. [Model Lagrangian / §2] The quantum numbers and Z2 charges of the vector-like fermions should be stated explicitly in the model-definition section rather than only in a table or appendix.
  2. [Figures] Figure captions and axis labels in the (g-2) and relic-density plots should indicate which constraints are active in each panel.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive report and the clear identification of the key requirement for explicit numerical verification. We address the major comment below.

read point-by-point responses
  1. Referee: The central claim (abstract and §1) is that suitable values of the vector-like fermion masses, Yukawa couplings, and inert-doublet parameters exist such that the same loops simultaneously reproduce the neutrino mass scale, Δa_e, Δa_μ, and Ωh² ≈ 0.12 while obeying all listed bounds. The manuscript must therefore supply explicit benchmark points (or allowed regions from scans) with the numerical values of all relevant masses and couplings, together with the resulting predictions for neutrino masses, (g-2), relic density, and the most constraining observables (e.g., BR(μ→eγ), σ_SI). Without such concrete demonstration, the assertion that the requirements are compatible remains unverified.

    Authors: We agree that the manuscript as submitted does not contain the explicit benchmark points or tabulated scan results needed to verify simultaneous compatibility. In the revised version we will add a new subsection (within the numerical results section) that presents three to four benchmark points. Each point will list the input masses and couplings (vector-like fermion masses, Yukawa matrices, inert-doublet parameters) together with the output values for the neutrino mass matrix, Δa_e, Δa_μ, Ωh², BR(μ→eγ), and spin-independent direct-detection cross section, confirming that all experimental bounds are satisfied. revision: yes

Circularity Check

0 steps flagged

No significant circularity; model accommodates data via viable parameter space

full rationale

The paper constructs a Z2-odd extension and shows that radiative loops from the new fields can generate neutrino masses and (g-2) contributions while the inert doublet can yield the observed DM relic density. These are presented as simultaneous explanations achieved by suitable choice of masses and Yukawa couplings, subject to experimental bounds. No equations are shown to reduce by construction to their inputs (e.g., no fitted parameter renamed as a prediction, no self-definitional relation, and no load-bearing self-citation chain). The central claim is an existence demonstration for a common parameter set, which is self-contained against external data and does not rely on renaming or smuggling prior results. This is the standard non-circular structure of a BSM phenomenology paper.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 2 invented entities

The central claim rests on the introduction of new Z2-odd fields whose masses and couplings are adjusted to fit three independent observables; the ledger therefore records the new particles as invented entities and the Z2 symmetry plus loop-level mass generation as domain assumptions, with multiple free parameters required for the simultaneous fits.

free parameters (2)
  • masses and Yukawa couplings of the two generations of vector-like fermions
    These are chosen to produce the correct neutrino mass scale and (g-2) shifts while contributing to the DM annihilation cross section.
  • mass and quartic couplings of the inert scalar doublet
    Adjusted to set the DM relic density and ensure the lightest component is stable under Z2.
axioms (2)
  • domain assumption Z2 symmetry under which the new fermions and scalar doublet are odd
    Invoked to forbid tree-level neutrino masses and guarantee DM stability; stated in the abstract.
  • standard math Neutrino masses generated radiatively at one-loop level
    Standard quantum-field-theory loop calculation assumed to produce the observed mass-squared differences and mixings.
invented entities (2)
  • two generations of vector-like fermions no independent evidence
    purpose: Generate radiative neutrino masses and contribute to anomalous magnetic moments
    New fermions postulated to mediate the required loops; no independent evidence supplied.
  • inert scalar doublet no independent evidence
    purpose: Provide a stable dark matter candidate and participate in the same loops
    New scalar field introduced to stabilize DM and close the diagrams; no independent evidence supplied.

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