arxiv: 2604.14282 · v1 · submitted 2026-04-15 · ✦ hep-ph

Recognition: unknown

Probing Neutrino Compositeness with Invisible and Displaced Signals

Matteo Borrello , Marco Costa , Diego Redigolo , Michele Tammaro

Authors on Pith no claims yet

Pith reviewed 2026-05-10 12:46 UTC · model grok-4.3

classification ✦ hep-ph

keywords neutrino compositenessdark jetsdisplaced verticessterile sectorneutral currenthigh-energy neutrinoscomposite modelscontact interactions

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The pith

High-energy neutrino beams can detect neutrino compositeness through dark jet signatures and displaced vertices beyond existing limits.

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

The paper examines a scenario where neutrinos couple to a composite sterile sector, extending the heavy neutral lepton idea into a setting with hidden strong interactions. When the confinement scale is low, high-energy neutrinos can break apart into sprays of hidden particles known as dark jets. This produces two main signals: long-lived resonances that raise the ratio of neutral-current to charged-current events, and shorter-lived states that create displaced vertices or emerging jets in detectors. These effects allow tests of neutrino structure at facilities like DUNE and the LHCb, reaching parameter regions not covered by meson decays, electroweak data, or Higgs studies. The work also classifies the induced higher-dimensional interactions and sketches an experimental program spanning current and future machines.

Core claim

Neutrinos can couple to an interacting composite sterile sector at low confinement scale, allowing high-energy neutrino beams to disintegrate into collimated dark jets. Long-lived dark resonances enhance neutral-current to charged-current ratios while shorter-lived states yield single or multiple displaced vertices and emerging jets. These signatures probe compositeness scales beyond constraints from meson, electroweak, and Higgs decays, with high-energy neutrino beams providing leading sensitivity in broad classes of ultraviolet completions that also induce higher-dimensional contact interactions.

What carries the argument

Dark jets produced by neutrino disintegration in a composite sterile sector with low confinement scale, generating long-lived resonances and displaced decays.

If this is right

Long-lived dark resonances raise the neutral-current to charged-current ratio in neutrino beam experiments.
Shorter-lived dark states produce observable displaced vertices or emerging jets depending on production kinematics.
Higher-dimensional contact interactions are generated and can be studied through their distinct experimental signatures.
Near-term facilities including DUNE, the Forward Physics Facility, LHCb, and Belle II can access these signals via neutrino disintegration and displaced B-meson decays.
Future electron-positron colliders such as FCC-ee achieve the strongest reach through displaced Z decays.

Where Pith is reading between the lines

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

Similar disintegration effects could appear in astrophysical neutrino sources and alter their propagation over cosmic distances.
The same composite sector might provide a common origin for neutrino masses and a dark matter candidate among the hidden states.
Precise mapping of the confinement scale through these signals would constrain the ultraviolet completions of the standard model involving composite neutrinos.

Load-bearing premise

The sterile sector has a low enough confinement scale that high-energy neutrinos can disintegrate into collimated dark jets and long-lived resonances.

What would settle it

A null result with no excess neutral-current events or displaced vertices in high-energy neutrino neutral-current searches at the Forward Physics Facility or DUNE would rule out the leading-sensitivity regime for compositeness scales below several TeV.

read the original abstract

We explore the possibility that neutrinos couple to an interacting sterile sector, providing a novel portal that generalizes the heavy neutral lepton portal to a composite setting. For a low confinement scale, high-energy neutrino beams can disintegrate into collimated sprays of hidden states, referred to as dark jets. This dynamics gives rise to two characteristic signatures in high energy neutrino beams. First, long-lived dark resonances can enhance the neutral-current to charged-current ratio. Second, shorter-lived dark states produced in neutrino neutral currents can produce single or multiple displaced vertices and even emerging jets, depending on the kinematics. These signals probe regions of parameter space beyond existing constraints from meson, electroweak, and Higgs decays, as well as from searches for displaced decays at beam dump experiments. We study these phenomena within broad classes of ultraviolet completions and identify scenarios in which high-energy neutrino beams provide leading sensitivity to neutrino compositeness. Such scenarios generically induce higher-dimensional contact interactions, which we classify and study alongside their complementary experimental signatures. Finally, we outline an experimental program spanning both the intensity and energy frontiers. Near-term neutrino facilities (DUNE, FPF) and running flavor experiments (LHCb, Belle II) can probe neutrino compositeness through neutrino disintegration into dark jets and displaced B-meson decays. Future colliders, particularly the Future Circular Collider (FCC-ee), will ultimately provide the strongest sensitivity to the compositeness scale via displaced Z decays.

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.

Desk Editor's Note private letter to a colleague

The paper maps neutrino compositeness to dark jet disintegration and displaced signals at DUNE/FPF, but the leading-sensitivity claim hinges on a narrow low-confinement window that still needs explicit checks against existing bounds.

read the letter

The main takeaway is that high-energy neutrinos could fragment into collimated dark jets if they couple to a composite sterile sector, producing either boosted neutral-current rates from long-lived states or displaced vertices from shorter-lived ones. This generalizes the usual heavy neutral lepton portal in a way that has not been explored much before. The paper does a good job laying out the two main signatures, classifying the higher-dimensional operators that arise in broad UV completions, and sketching an experimental program that ties the idea to DUNE, FPF, LHCb, Belle II, and FCC-ee. The discussion of emerging jets and multiple displaced vertices is concrete enough to be useful for thinking about detector-level searches. The experimental outline is practical and avoids over-promising on discovery reach. The soft spot is the central claim that neutrino beams give leading sensitivity beyond meson decays, electroweak precision, Higgs constraints, and beam-dump searches. That requires the confinement scale to be low enough for disintegration to occur while the resulting particles still land in the right lifetime and acceptance range without having been excluded already. The abstract states that broad classes of completions work, but without seeing the actual decay-length calculations and parameter scans it is not clear how wide the surviving window really is. If most of the interesting region is already ruled out or falls outside detector coverage, the “leading” part does not hold. This is for people working on BSM neutrino physics or hidden-sector phenomenology who want new intensity-frontier signatures to consider. A reader interested in sterile neutrinos or composite dark sectors would get value from the signature ideas even if they later adjust the numbers. I would send it to peer review; the mechanism is fresh and the phenomenology is developed enough that referees can test the parameter mapping and see whether the reach claims survive.

Referee Report

2 major / 2 minor

Summary. The manuscript explores neutrino compositeness via coupling to an interacting sterile sector with low confinement scale. High-energy neutrinos can disintegrate into collimated dark jets, yielding two main signatures: long-lived dark resonances that enhance the neutral-current to charged-current ratio, and shorter-lived states producing single/multiple displaced vertices or emerging jets. The authors consider broad classes of UV completions, classify the induced higher-dimensional contact interactions, and argue that DUNE, FPF, LHCb, Belle II, and FCC-ee can probe regions of parameter space beyond existing constraints from meson, electroweak, Higgs decays, and beam-dump searches.

Significance. If the viable parameter space is robustly demonstrated, the work provides a useful generalization of the heavy neutral lepton portal to composite settings and identifies new phenomenological handles (dark jets, displaced vertices in neutrino beams) that could give leading sensitivity at near-term facilities. The classification of contact interactions and the outlined experimental program across intensity and energy frontiers are constructive contributions.

major comments (2)

[Dark jet signatures and experimental reach] § on dark jet signatures and experimental reach: The central claim that high-energy neutrino beams provide leading sensitivity requires explicit demonstration that, for confinement scales low enough to permit neutrino disintegration into collimated dark jets and long-lived resonances, the resulting production rates, decay lengths, and acceptances at DUNE/FPF exceed both SM backgrounds and existing limits from meson decays and beam dumps. A quantitative scan or exclusion plot in the (confinement scale, coupling) plane is needed to confirm the viable window is not empty or already ruled out.
[UV completions and contact interactions] § on UV completions and contact interactions: The mapping from the composite sterile sector to higher-dimensional operators should include a check that these operators do not induce stronger constraints from precision electroweak or Higgs data than the claimed neutrino-beam signatures; without this, the assertion that neutrino facilities give leading sensitivity risks being undermined by indirect bounds.

minor comments (2)

[Introduction and UV completions] A summary table listing the broad classes of UV completions, their key parameters, and representative signatures would improve readability and allow readers to track the scenarios discussed.
[Figures] Figure captions for signature diagrams and parameter scans should explicitly state the benchmark values of confinement scale and couplings used, to facilitate reproduction of the kinematics.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive and detailed report. The comments highlight important areas where the manuscript can be strengthened with more explicit quantitative support. We address each major comment below and will revise the manuscript to incorporate the requested demonstrations.

read point-by-point responses

Referee: The central claim that high-energy neutrino beams provide leading sensitivity requires explicit demonstration that, for confinement scales low enough to permit neutrino disintegration into collimated dark jets and long-lived resonances, the resulting production rates, decay lengths, and acceptances at DUNE/FPF exceed both SM backgrounds and existing limits from meson decays and beam dumps. A quantitative scan or exclusion plot in the (confinement scale, coupling) plane is needed to confirm the viable window is not empty or already ruled out.

Authors: We agree that an explicit quantitative demonstration is required to substantiate the leading sensitivity claim. In the revised manuscript we will add a scan in the (confinement scale, coupling) plane. This will include calculations of neutrino disintegration rates into dark jets, decay lengths of the long-lived resonances, and signal acceptances at DUNE and FPF, together with direct comparisons to SM neutral-current backgrounds and existing limits from meson decays and beam-dump searches. The resulting exclusion plot will delineate the viable window where the neutrino-beam signatures are not already excluded. revision: yes
Referee: The mapping from the composite sterile sector to higher-dimensional operators should include a check that these operators do not induce stronger constraints from precision electroweak or Higgs data than the claimed neutrino-beam signatures; without this, the assertion that neutrino facilities give leading sensitivity risks being undermined by indirect bounds.

Authors: We acknowledge the need for an explicit check. The manuscript already classifies the higher-dimensional contact interactions and references existing electroweak and Higgs constraints, but we will add a dedicated subsection that computes the contributions of these operators to precision observables (oblique parameters S and T, and modifications to Higgs couplings). We will then compare the resulting bounds directly to the projected sensitivity from neutrino-beam signatures, confirming that the latter remain competitive or leading in the relevant parameter space. revision: yes

Circularity Check

0 steps flagged

No significant circularity; derivation self-contained from assumed UV portal

full rationale

The paper posits a composite sterile sector with low confinement scale as input, then derives dark-jet and displaced-vertex signatures from that dynamics and compares them to external constraints (meson decays, EW precision, beam dumps). No equations or predictions reduce to fitted parameters by construction, no self-citation chains justify uniqueness theorems, and no ansatz is smuggled via prior work. The 'leading sensitivity' claim is a comparative statement over parameter space, not a tautology. This matches the default expectation for model-building papers whose central results remain falsifiable against independent data.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 2 invented entities

The central claim rests on the existence of an interacting sterile sector with low confinement scale and various UV completions that induce higher-dimensional operators; several new entities are postulated without independent evidence outside the model.

free parameters (2)

confinement scale
Low value assumed to enable dark jet formation and displaced decays in neutrino beams.
coupling strengths to sterile sector
Parameters controlling the portal interactions and resonance lifetimes.

axioms (2)

domain assumption Neutrinos couple to an interacting sterile sector that generalizes the heavy neutral lepton portal to a composite setting.
Foundational assumption enabling the disintegration dynamics.
domain assumption Broad classes of ultraviolet completions induce higher-dimensional contact interactions with observable signatures.
Used to classify complementary experimental signatures.

invented entities (2)

dark jets no independent evidence
purpose: Collimated sprays of hidden states from neutrino disintegration.
Postulated to produce the invisible and displaced signals.
dark resonances no independent evidence
purpose: Long-lived states that enhance the neutral-current to charged-current ratio.
Invented for the invisible signal enhancement.

pith-pipeline@v0.9.0 · 5557 in / 1466 out tokens · 29064 ms · 2026-05-10T12:46:59.015888+00:00 · methodology

discussion (0)

Reference graph

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