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arxiv: 2505.01401 · v3 · submitted 2025-05-02 · ✦ hep-ph

Non-Standard Neutrino Interactions at Neutrino Experiments and Colliders

Pith reviewed 2026-05-22 16:52 UTC · model grok-4.3

classification ✦ hep-ph
keywords non-standard neutrino interactionsneutrino experimentscollider searchesleptoquarksheavy neutral leptonseffective field theorysimplified models
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0 comments X

The pith

Collider searches constrain most models of non-standard neutrino interactions more tightly than neutrino experiments.

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

The paper examines non-standard neutrino interactions parametrized by effective four-fermion operators and compares the sensitivity of neutrino experiments to high-energy collider searches. It employs explicit simplified models including new U(1) gauge bosons, scalar leptoquarks, and heavy neutral leptons because the effective field theory description breaks down at collider energies. The analysis concludes that collider data generally sets stronger limits on the model parameters than neutrino measurements, except in the cases of muon-philic leptoquarks and heavy neutral leptons that mix with electron or muon neutrinos. This establishes a clear complementarity where colliders often dominate the constraints for the studied scenarios.

Core claim

In the models we study, with the possible exceptions of muon-philic leptoquarks and heavy neutral leptons mixing with electron or muon neutrinos, collider searches are more constraining than neutrino measurements.

What carries the argument

Simplified models with explicit ultraviolet completions, such as new gauge bosons, scalar leptoquarks, and heavy neutral leptons, that replace the effective operator description at collider energies to extract constraints.

If this is right

  • Future runs at the LHC and planned electron-positron or muon colliders will further restrict the viable parameter space for most of the considered models.
  • Neutrino experiments retain a potential leading role only in specific model classes such as muon-philic leptoquarks.
  • Additional model-building efforts are needed to construct scenarios in which neutrino measurements provide the dominant constraints.

Where Pith is reading between the lines

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

  • A mismatch between neutrino and collider bounds could point toward the exceptional models like muon-philic leptoquarks.
  • Joint analyses of neutrino and collider data sets could help identify which underlying new-physics structure is present.
  • The brief comments on alternative model building suggest avenues where low-energy neutrino facilities could become the primary probes.

Load-bearing premise

The effective field theory description of non-standard neutrino interactions remains valid at neutrino-experiment energies but requires explicit ultraviolet completions at collider energies.

What would settle it

A non-standard neutrino interaction signal appearing in neutrino experiments without a corresponding collider signature or bound in the same simplified model parameter space.

read the original abstract

The impact of new physics on the interactions of neutrinos with other particles can be parametrized by a set of effective four-fermion operators called non-standard neutrino interactions (NSIs). This NSI framework is useful for studying the complementarity between different types of neutrino experiments. In this work, we further compare the reach of neutrino experiments with high-energy collider experiments. Since high-energy colliders often probe the mass scale associated with the four-fermion operators, the effective field theory approach becomes invalid and explicit models must be utilized. We study a variety of representative simplified models including new U(1) gauge bosons, scalar leptoquarks, and heavy neutral leptons. For each of these, we examine the model parameter space constrained by NSI bounds from current and future neutrino experiments, and by data from the Large Hadron Collider and planned electron-positron and muon colliders. We find that in the models we study, with the possible exceptions of muon-philic leptoquarks and heavy neutral leptons mixing with electron or muon neutrinos, collider searches are more constraining than neutrino measurements. Additionally, we briefly comment on other model building possibilities for obtaining models where neutrino experiments are most constraining.

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 examines non-standard neutrino interactions (NSIs) parametrized by effective four-fermion operators and compares the reach of neutrino experiments versus high-energy colliders. Because the EFT description breaks down at collider energies, the authors analyze explicit simplified models (new U(1) gauge bosons, scalar leptoquarks, and heavy neutral leptons). They conclude that collider searches are more constraining than neutrino measurements in the models studied, with possible exceptions for muon-philic leptoquarks and heavy neutral leptons mixing with electron or muon neutrinos. The work also briefly discusses other model-building avenues where neutrino experiments could dominate.

Significance. If the model-by-model numerical comparisons are robust, the paper makes a useful contribution by quantifying the complementarity between low-energy neutrino probes and collider searches for NSIs. The explicit switch to UV completions for high-energy analyses is a strength, as is the inclusion of both current LHC data and projections for future e+e- and muon colliders. The discussion of model-building possibilities for neutrino-dominant scenarios adds forward-looking value.

major comments (1)
  1. [Sections discussing leptoquark and HNL results] The central claim identifies exceptions for muon-philic leptoquarks and certain HNL mixings, but the manuscript should provide explicit quantitative comparisons (e.g., exclusion contours or benchmark parameter values) showing why neutrino experiments become competitive in these cases while remaining subdominant elsewhere.
minor comments (2)
  1. [Introduction and model definitions] Clarify the precise energy scale at which the EFT is deemed invalid for each model and confirm that the chosen UV completions reproduce the low-energy NSI operators without additional assumptions.
  2. [Figures and results sections] Ensure all figures comparing constraints include consistent axis ranges, legend entries for each experiment, and clear indication of which bounds are from neutrino data versus colliders.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for the constructive suggestion regarding the presentation of the exceptional cases. We agree that additional explicit quantitative comparisons will strengthen the discussion and have revised the manuscript accordingly.

read point-by-point responses
  1. Referee: [Sections discussing leptoquark and HNL results] The central claim identifies exceptions for muon-philic leptoquarks and certain HNL mixings, but the manuscript should provide explicit quantitative comparisons (e.g., exclusion contours or benchmark parameter values) showing why neutrino experiments become competitive in these cases while remaining subdominant elsewhere.

    Authors: We agree with the referee that the manuscript would benefit from more explicit quantitative comparisons to substantiate the identified exceptions. In the revised version, we have added new figures in the leptoquark section showing exclusion contours in the coupling-mass plane for the muon-philic scalar leptoquark. These contours demonstrate that neutrino scattering and oscillation experiments can exclude parameter regions (particularly at lower masses) that remain allowed by current LHC searches, owing to the flavor-specific nature of the couplings that suppress certain collider production channels. For heavy neutral leptons, we have included a table of benchmark mixing angles with electron and muon neutrinos, together with the corresponding NSI bounds from neutrino experiments and the collider limits from displaced vertex and prompt searches. The benchmarks illustrate the regimes in which the low-energy neutrino constraints become competitive because they directly probe the mixing-induced effective operators without the kinematic suppression affecting high-energy production. These additions clarify the conditions under which neutrino experiments can compete with or exceed collider sensitivity while preserving the overall conclusion that colliders dominate in the other models studied. revision: yes

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

The paper compares NSI constraints from neutrino experiments against collider limits using explicit UV completions (U(1) gauge bosons, leptoquarks, HNLs) once the EFT breaks down at high energies. All bounds are taken from external experimental results and standard model extensions; no parameter is fitted to a subset of the data and then relabeled as a prediction, no self-citation supplies a load-bearing uniqueness theorem, and no derivation reduces by construction to its own inputs. The central claim is a model-by-model numerical comparison of independently obtained exclusion regions.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 1 invented entities

The central claim rests on the validity of the effective NSI operator framework at low energies and the choice of representative simplified models at high energies. No explicit free parameters are named in the abstract, but model-specific couplings and masses are implicitly fitted or scanned.

axioms (1)
  • domain assumption Effective four-fermion operators provide a valid parametrization of new physics at neutrino-experiment energies.
    Stated in the opening of the abstract as the basis for the NSI framework.
invented entities (1)
  • Simplified models (new U(1) gauge bosons, scalar leptoquarks, heavy neutral leptons) no independent evidence
    purpose: To bridge the effective NSI description to ultraviolet-complete scenarios testable at colliders.
    Introduced as representative cases for explicit model studies.

pith-pipeline@v0.9.0 · 5736 in / 1213 out tokens · 51371 ms · 2026-05-22T16:52:46.293310+00:00 · methodology

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Reference graph

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