The Deep Underground Neutrino Experiment (DUNE) program

I. Gil-Botella

REVIEW 2 major objections 5 minor 12 references

The Deep Underground Neutrino Experiment (DUNE) program

T0 review · 2 major / 5 minor · reviewed 2026-08-11 · deepseek-v4-flash

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Pith's one-line read DUNE projects that one year of data can settle the neutrino mass ordering at 5σ, with leptonic CP violation to follow at 3σ in 3.5 years.

desk verdict A clean, honest DUNE status report whose only new content is the operational milestones; the physics reach numbers are recycled DUNE projections, and the one genuine soft spot is an undefined staging scenario behind the timeline headlines. read the letter →

arxiv 2412.14941 v1 pith:BPMDN3WN submitted 2024-12-19 hep-ex hep-phphysics.ins-det

I. Gil-Botella This is my paper · ORCID

classification hep-exhep-phphysics.ins-det

keywords neutrinooscillationsmassorderingleptonicCPviolationDUNEliquidargonTPClong-baselineexperimentsupernovaneutrinosbeyondStandardModelsearches

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This review argues that DUNE is built to settle two open neutrino questions: the mass ordering and leptonic CP violation. Its central projection is that, for the best-case CP phase $\delta_{CP} = -\pi/2$, one year of beam data gives $5\sigma$ sensitivity to the mass ordering and 3.5 years gives $3\sigma$ evidence for CP violation; even in the worst case the ordering reaches $5\sigma$ in three years. DUNE also expects to establish CP violation over more than 75% of possible $\delta_{CP}$ values, while its far detectors double as a supernova and solar neutrino observatory and a laboratory for beyond-Standard-Model searches. These numbers matter because the mass ordering shapes models of neutrino mass, and a measured neutrino CP phase would be one of the few known handles on matter–antimatter asymmetry.

What carries the argument

The central mechanism is long-baseline neutrino oscillation read by liquid argon time projection chambers (LArTPCs), with a movable near-detector system sampling the beam before oscillation. Matter effects in the 1300 km rock column make the mass ordering visible in the appearance spectra, and the difference between neutrino and antineutrino rates is the handle on $\delta_{CP}$. The near detector constrains the flux and interaction uncertainties that would otherwise dominate, while full-scale prototypes (ProtoDUNE) demonstrate the far detector's energy reconstruction and particle identification.

What would settle it

After the first year of beam running, compare the reconstructed electron-neutrino and antineutrino energy spectra at the far detector against the normal-ordering and inverted-ordering predictions using the measured near-detector constraints; if the mass-ordering separation is well below $5\sigma$ despite the event rate matching predictions, the central timeline claim fails. A simpler check is to verify that the first data can individually constrain the dominant flux and cross-section systematic parameters with the precision assumed by the sensitivity curves.

Watch

Extended reading notes

Core claim

The discovery DUNE is designed to make is a decisive determination of the neutrino mass ordering and, if nature cooperates, the first observation of leptonic CP violation. Using a wideband neutrino beam and four liquid argon time projection chamber far detector modules totaling about 70 kilotons, DUNE compares $\nu_e$ appearance with $\bar{\nu}_e$ appearance over a 1300 km baseline; matter effects along that baseline encode the ordering, while the neutrino–antineutrino spectral difference isolates $\delta_{CP}$. The paper's stated projection is that for true $\delta_{CP} = -\pi/2$ the mass-ordering significance reaches $5\sigma$ after one year, the CP-violation significance reaches $3\sigma$ after 3.5 years, and over 75% of the allowed $\delta_{CP}$ range the experiment can establish CP violation at more than $3\sigma$. The near detector complex, measuring the unoscillated beam at 560 meters, is presented as the component that turns these spectra into a clean measurement by constraining flux and cross-section systematics.

Load-bearing premise

The projected timelines assume that the near detector constrains beam flux and neutrino-interaction uncertainties to the levels used in the collaboration's simulations, and that the far detector reconstructs neutrino energies as well as simulation predicts; if either assumption is optimistic, the 1-year and 3.5-year milestones will take longer to reach.

Editorial extensions

If this is right

If the one-year $5\sigma$ mass-ordering goal holds, the hierarchy question is effectively closed for long-baseline physics, and the remaining headline becomes the CP phase.
CP violation at more than $3\sigma$ over 75% of $\delta_{CP}$ values would establish a real difference between neutrino and antineutrino oscillations, a result no current experiment has reached.
Precision measurements of $\delta_{CP}$, $\theta_{23}$, and $\theta_{13}$ in one experiment will sharpen comparisons with reactor experiments and with models of neutrino mass generation.
A Galactic supernova would be recorded as a burst of thousands of events, and the neutronization burst alone could give an independent mass-ordering measurement.
Solar $^8$B neutrinos above 9–10 MeV, and the first measurement of the $hep$ flux, would extend solar neutrino tests of matter effects and $\Delta m^2_{21}$.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

If the first-year mass-ordering milestone is treated as a real decision point, a natural extension is to use the first data explicitly to validate the near-detector systematic budget before claiming the CP-violation result.
The same electron-neutrino identification that serves the oscillation analysis also enables the supernova and solar channels, so calibration advances in one channel should improve all three programs.
A large measured CP phase would make leptogenesis a more concrete explanation for the cosmic matter–antimatter asymmetry, a consequence the paper does not spell out.
The 75% coverage claim implies a specific sensitivity curve that could be checked against the real data after several years, making the projection itself a testable prediction.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Desk Editor's Note

read the letter

Let me give you the short version: this is a six-page ICHEP proceedings written on behalf of the DUNE collaboration. The genuinely new content is operational: ProtoDUNE-HD started cosmic-ray and test-beam data at CERN in May 2024, ProtoDUNE-VD is planned for early 2025, and the ND-LAr 2x2 demonstrator at Fermilab has detected its first neutrino interactions. Everything else—mass ordering and CP violation sensitivities, supernova and solar physics, BSM reach—is reproduced from DUNE's own design and sensitivity papers [2]-[6] and [10]. For a status report that is not a flaw; it is the genre.

What the paper does well: it is a clear, accurate snapshot of where DUNE stands as of ICHEP 2024. The sensitivity numbers are quoted consistently with the cited DUNE simulations, and the text does not oversell them. The descriptions of the horizontal-drift and vertical-drift far detector technologies, the near detector complex, and the Phase I/Phase II staging are all consistent with the technical design reports. A reader who wants a quick, authoritative overview of the DUNE physics program and construction status can get it here.

The soft spots are two, and both are minor. First, the staging ambiguity that the stress-test flagged is real. The headline timelines—5σ mass ordering in 1 year, 3σ CPV in 3.5 years for δ_CP = -π/2—are said to be 'for the currently assumed staging scenario,' but that scenario is never defined. The figures probably refer to the full 40-kton-fiducial configuration with staged beam power from the DUNE design reports, not the Phase I configuration of two FD modules and a 1.2 MW beam described in Section 2. A reader could reasonably take the numbers as Phase I expectations, which would be overoptimistic. One sentence identifying the exposure and beam-power assumptions behind the curves would fix this.

Second, there are no error bars on the projections and no independent check against external data. That is expected for a proceedings that points to the original papers, but it is worth remembering that all of the quantitative claims are self-referential DUNE-to-DUNE.

The citation pattern is fine for the genre. The only external reference is a SoLAr proposal, which is relevant to the Module of Opportunity discussion.

Who is this for? Someone who needs a concise, current summary of DUNE's goals and detector status, or a proceedings reader. It is not a source of new physics results.

Recommendation: if this came to me as an editor, I would send it to a referee rather than desk reject. It is an honest, well-written status report with real operational milestones, and the staging ambiguity is a fixable clarity issue, not a scientific error. A referee should verify the operational dates and ask the authors to specify the staging scenario behind the sensitivity timelines.

Referee Report

2 major / 5 minor

Summary. This is a conference proceedings paper (ICHEP 2024) written on behalf of the DUNE collaboration. It summarizes the DUNE physics program: long-baseline neutrino oscillation measurements of the mass ordering, the CP-violating phase, and θ23; astrophysical neutrino measurements (supernovae and solar neutrinos); and beyond-Standard-Model searches (nucleon decay, dark matter, sterile neutrinos, non-unitarity, etc.). The paper then describes the DUNE detectors: the four planned 17-kton LArTPC far detector modules, the near detector complex (ND-LAr, TMS, SAND), the Phase I/Phase II staged construction, and the ProtoDUNE prototyping program at CERN, including recent 2024 data-taking. The quantitative sensitivity claims (e.g., 5σ mass ordering in 1 year for δ_CP = -π/2, 3σ in 3.5 years, CP violation for 75% of δ_CP values) are quoted from previous DUNE simulation papers, and the paper contains no new analysis.

Significance. If read as a status report, the paper gives a concise and reasonably complete overview of DUNE's scientific goals and construction status, with accurate quotations of the collaboration's published sensitivity projections. The paper's value is archival: it documents the program's current state (Phase I construction, ProtoDUNE-II operation) and its planned physics reach. The central physics claims are not new, but for a conference proceedings this is appropriate. The paper would be strengthened by clearly labeling the exposure and staging assumptions behind the headline sensitivity numbers, because the current text invites ambiguity between Phase I and the full four-module configuration. The prototyping results described are real experimental progress and are a strength of the paper.

major comments (2)

[Section 1, Figures 1 and 2] The headline sensitivity statements ('5σ mass ordering sensitivity in 1 year of data', '3σ in 3.5 years', 'CP violation over 75% of δ_CP values at more than 3σ') are attributed to 'the currently assumed staging scenario', but that scenario is never defined. The abstract describes four 17-kton modules with a 1.2 MW beam, while Section 2 states that Phase I (currently under construction) consists of two modules and a 1.2 MW beam, and Phase II adds two further modules and a 2.1 MW beam. The sensitivity curves reproduced from Refs. [2,3] correspond to a specific staged exposure (fiducial mass, beam power, run-time split, and Phase I/II assumptions) that is not stated. Without this definition, a reader could misinterpret the 1-year and 3.5-year timelines as Phase I-only claims, which would be materially overoptimistic. Please add an explicit statement of the staging and exposure assumptions for each quoted projection, or label the figures with the assumed configuration.
[Section 2 (near detector) and Figures 1-3] The paper does not explicitly state that the sensitivity projections in Figures 1-3 assume the near detector complex constrains neutrino flux and cross-section systematics to the level modeled in Refs. [2,3], and that the far detector energy reconstruction matches simulation. The near detector is described in Section 2, but the conditional nature of the projected timelines is not stated. If these assumptions are not realized, the quoted sensitivities (and especially the 1-year/3.5-year mass-ordering claims) would be optimistic. A single sentence noting that the projections inherit the systematic assumptions of the cited DUNE simulation studies would make the claims appropriately conditional.

minor comments (5)

[Abstract and Section 1] The abstract says 'four 17 kton LArTPC far detector modules to be built', but Section 2 clarifies that Phase I (currently under construction) has only two modules. Since Phase II is a later upgrade, the abstract should say 'four 17 kton modules planned' to avoid implying all four are under construction.
[Section 1] The phrase 'A suit of four Far Detector (FD) modules (70 kton LAr TPCs)' should be 'A suite of ...', and the total mass 4 × 17 kton = 68 kton should be given as '68 kton (70 kton not including support structures)' or simply '68 kton' to avoid an apparent arithmetic discrepancy.
[Figure 3 caption] The left-panel caption reads 'The DUNE resolution to δ_CP for as a function of the true δ_CP value' and contains a stray 'for'; please remove it. The right-panel caption 'sin22θ13' should be typeset as sin^2 2θ13.
[Section 3] The name 'ND-LAr2x2' should be written with a space as 'ND-LAr 2x2' (or 'ND-LAr 2×2') for consistency with the standard nomenclature.
[References] Reference [4] is missing a space in 'Supernovaneutrinoburst'; it should read 'Supernova neutrino burst detection with the Deep Underground Neutrino Experiment'.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the paper is a status report quoting DUNE simulation sensitivity projections, not a derivation that reduces to its own inputs.

full rationale

This is a conference proceedings that describes the DUNE program and quotes sensitivity numbers (e.g., 5 sigma mass ordering in 1 year for the best case) from earlier DUNE collaboration simulation papers, refs. [2,3]. The numerical claims are forward-looking projections based on detector simulation, beam assumptions, and systematic models; they are not obtained by fitting a parameter to a subset of data and then renaming the fit as a prediction, nor are they defined in terms of the conclusions they support. The self-citations are to the collaboration's own detailed sensitivity studies, which is expected for a status report and does not constitute a circular reduction in the logical sense. The reader's concern about the unspecified 'currently assumed staging scenario' is a legitimate clarity and correctness issue, but it is not a circularity: the paper does not use the sensitivity numbers to define that staging scenario. No step in the paper exhibits the pattern of equating an output to an input by construction, so the appropriate finding is no significant circularity, score 0.

Assumptions & free parameters 1 free parameters · 3 assumptions · 0 invented entities

This ledger captures the framework, simulation, and extrapolation assumptions behind the quoted sensitivities. These assumptions come from earlier DUNE collaboration publications rather than from new work in this paper. No new particles, forces, or entities are proposed.

free parameters (1)

Assumed true value of delta_CP = -pi/2 (best case); 75% coverage scenarios
Figures 1 and 2 quote sensitivity versus running time for chosen true values of the CP phase. These are scenario inputs from cited DUNE simulations, not fits to new data.

assumptions (3)

domain assumption Three-flavor neutrino oscillation with standard matter effects (MSW) is the correct framework for long-baseline interpretations.
Invoked in Section 1 for mass ordering and CP violation sensitivities; the paper assumes this framework rather than testing it.
domain assumption The DUNE sensitivity projections quoted from refs [2], [3], [4], [6], and [10] are correct for the stated running scenarios.
All quantitative claims in Section 1 and Figures 1-4 are inherited from these DUNE collaboration simulation studies; the paper provides no independent verification.
domain assumption Performance demonstrated by the 770 ton ProtoDUNE prototypes extrapolates to the full 70 kton far detector modules.
Section 3 presents ProtoDUNE as a testbed; the physics reach of Phase I and Phase II assumes the final detectors meet this demonstrated performance.

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Cite this review

Pith. "Pith review of The Deep Underground Neutrino Experiment (DUNE) program." pith.science (2026). https://pith.science/paper/BPMDN3WN

@misc{pith2026241214941,
  author       = {Pith},
  title        = {Pith review of: The Deep Underground Neutrino Experiment (DUNE) program},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/BPMDN3WN}},
  note         = {Machine review of arXiv:2412.14941}
}

read the original abstract

The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline neutrino oscillation experiment aimed at determining the neutrino mass hierarchy and the CP-violating phase. The DUNE physics program also includes the detection of astrophysical neutrinos and the search for signatures beyond the Standard Model, such as nucleon decays. DUNE consists of a near detector complex located at Fermilab and four 17 kton Liquid Argon Time Projection Chamber (LArTPC) far detector modules to be built 1.5 km underground at SURF, approximately 1300 km away. The detectors are exposed to a wideband neutrino beam generated by a 1.2 MW proton beam with a planned upgrade to > 2 MW. Two 770 ton LArTPCs (ProtoDUNEs) have been operated at CERN for over 2 years as a testbed for DUNE far detectors and have been optimized to take new cosmic and test-beam data in 2024-2025. The DUNE and ProtoDUNE experiments and physics goals, as well as recent progress and results, are presented.

Figures

Figures reproduced from arXiv: 2412.14941 by the authors.

**Figure 1.** The significance for DUNE to establish the mass ordering for the best case (left panel) and worse case (right) as a function of running time. The ultimate goal of DUNE is to provide high precision measurements of the oscillation parameters in a single experiment. DUNE will reach between 6-16 degrees resolution to 𝛿𝐶𝑃 (with external input for only solar parameters) depending on the true 𝛿𝐶𝑃 value and world-leading pr… view at source ↗

**Figure 2.** The significance for DUNE to establish CP violation for the best case (left panel) and 75% (right) of 𝛿𝐶𝑃 values as a function of running time [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗

**Figure 3.** (Left panel) The DUNE resolution to 𝛿𝐶𝑃 for as a function of the true 𝛿𝐶𝑃 value for different integrated exposures. (Right panel) The DUNE resolution to sin22𝜃13 as a function of exposure in kt-MWyrs. several thousand events from a galactic supernova burst. As shown in [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗

Figures from the paper (3 more)

**Figure 4.** Figure 4: Expected event rates as a function of time for 40 kton of argon during early stages of a supernova burst at 10 kpc (left). DUNE sensitivity to inelastic boosted dark matter search in the 𝑝-scattering channel [6] (right). scenarios beyond the standard three-flavor pictu…

**Figure 5.** Figure 5: The horizontal drift FD-HD module (left), vertical drift FD-VD module (center), and one of the SURF caverns that will host the DUNE far detectors (right). The DUNE ND complex [9] will enable the prediction of the FD reconstructed spectra. The ND will use a movable dete…

**Figure 6.** Figure 6: One of the four modules of the ND-LAr 2x2 demonstrator (left panel). Inner view of ProtoDUNEHD (center) and ProtoDUNE-VD (right) at the CERN Neutrino Platform. In order to demonstrate the technical feasibility of the FDs and show the expected performance, two full-sca…

Discussion (0). Continue with ORCID to comment.

Reference graph

Works this paper leans on

12 extracted references · 1 linked inside Pith

[2]

Abi et al

B. Abi et al. [DUNE], Long-baseline neutrino oscillation physics potential of the DUNE experiment Eur. Phys. J. C80(2020) no.10, 978 [arXiv:2006.16043]

arXiv 2020
[6]

Abi et al

B. Abi et al. [DUNE], Prospects for beyond the Standard Model physics searches at the Deep Underground Neutrino Experiment , Eur. Phys. J. C 81 (2021) no.4, 322 [arXiv:2008.12769]

arXiv 2021
[10]

Abed Abudet al.[DUNE], DUNE Phase II: Scientific Opportunities, Detector Concepts, Technological Solutions, [arXiv:2408.12725]

A. Abed Abudet al.[DUNE], DUNE Phase II: Scientific Opportunities, Detector Concepts, Technological Solutions, [arXiv:2408.12725]

arXiv
[1]

B. Abiet al.[DUNE], Deep Underground Neutrino Experiment (DUNE), Far Detector Tech- nical Design Report, Volume I Introduction to DUNE, JINST 15 (2020) no.08, T08008 [arXiv:2002.02967]

arXiv 2020
[3]

Abed Abudet al.[DUNE], Low exposure long-baseline neutrino oscillation sensitivity of the DUNE experiment, Phys

A. Abed Abudet al.[DUNE], Low exposure long-baseline neutrino oscillation sensitivity of the DUNE experiment, Phys. Rev. D105 (2022) no.7, 072006 [arXiv:2109.01304]

arXiv 2022
[4]

[DUNE],SupernovaneutrinoburstdetectionwiththeDeepUndergroundNeutrino Experiment, Eur

B.Abi etal. [DUNE],SupernovaneutrinoburstdetectionwiththeDeepUndergroundNeutrino Experiment, Eur. Phys. J. C81 (2021) no.5, 423 [arXiv:2008.06647]

arXiv 2021
[5]

Abed Abud et al

A. Abed Abud et al. [DUNE], Supernova Pointing Capabilities of DUNE , [arXiv:2407.10339]

arXiv
[7]

B. Abiet al.[DUNE], Deep Underground Neutrino Experiment (DUNE), Far Detector Tech- nical Design Report, Volume IV: Far Detector Single-phase Technology, JINST 15 (2020) no.08, T08010 [arXiv:2002.03010]

arXiv 2020

Show all 12 references

[8]

Abed Abudet al.[DUNE], The DUNE Far Detector Vertical Drift Technology

A. Abed Abudet al.[DUNE], The DUNE Far Detector Vertical Drift Technology. Technical Design Report,JINST 19 (2024) no.08, T08004 [arXiv:2312.03130]

2024
[9]

Heweset al.[DUNE], Deep Underground Neutrino Experiment (DUNE) Near Detector Conceptual Design Report, Instruments 5(2021) no.4, 31 [arXiv:2103.13910]

V. Heweset al.[DUNE], Deep Underground Neutrino Experiment (DUNE) Near Detector Conceptual Design Report, Instruments 5(2021) no.4, 31 [arXiv:2103.13910]

2021
[11]

Abed Abudet al.[DUNE], Design, construction and operation of the ProtoDUNE-SP Liquid Argon TPC,JINST 17 (2022) no.01, P01005 [arXiv:2108.01902]

A. Abed Abudet al.[DUNE], Design, construction and operation of the ProtoDUNE-SP Liquid Argon TPC,JINST 17 (2022) no.01, P01005 [arXiv:2108.01902]

2022
[12]

Anfimov et al

N. Anfimov et al. [SoLAr], First Demonstration of a Combined Light and Charge Pixel Readout on the Anode Plane of a LArTPC, [arXiv:2406.14121]. 6

arXiv

Pith tools

Reviewed August 11, 2026 · model on record in the stance chip above.

[1] [2]

Abi et al

B. Abi et al. [DUNE], Long-baseline neutrino oscillation physics potential of the DUNE experiment Eur. Phys. J. C80(2020) no.10, 978 [arXiv:2006.16043]

arXiv 2020

[2] [6]

Abi et al

B. Abi et al. [DUNE], Prospects for beyond the Standard Model physics searches at the Deep Underground Neutrino Experiment , Eur. Phys. J. C 81 (2021) no.4, 322 [arXiv:2008.12769]

arXiv 2021

[3] [10]

Abed Abudet al.[DUNE], DUNE Phase II: Scientific Opportunities, Detector Concepts, Technological Solutions, [arXiv:2408.12725]

A. Abed Abudet al.[DUNE], DUNE Phase II: Scientific Opportunities, Detector Concepts, Technological Solutions, [arXiv:2408.12725]

arXiv

[4] [1]

B. Abiet al.[DUNE], Deep Underground Neutrino Experiment (DUNE), Far Detector Tech- nical Design Report, Volume I Introduction to DUNE, JINST 15 (2020) no.08, T08008 [arXiv:2002.02967]

arXiv 2020

[5] [3]

Abed Abudet al.[DUNE], Low exposure long-baseline neutrino oscillation sensitivity of the DUNE experiment, Phys

A. Abed Abudet al.[DUNE], Low exposure long-baseline neutrino oscillation sensitivity of the DUNE experiment, Phys. Rev. D105 (2022) no.7, 072006 [arXiv:2109.01304]

arXiv 2022

[6] [4]

[DUNE],SupernovaneutrinoburstdetectionwiththeDeepUndergroundNeutrino Experiment, Eur

B.Abi etal. [DUNE],SupernovaneutrinoburstdetectionwiththeDeepUndergroundNeutrino Experiment, Eur. Phys. J. C81 (2021) no.5, 423 [arXiv:2008.06647]

arXiv 2021

[7] [5]

Abed Abud et al

A. Abed Abud et al. [DUNE], Supernova Pointing Capabilities of DUNE , [arXiv:2407.10339]

arXiv

[8] [7]

B. Abiet al.[DUNE], Deep Underground Neutrino Experiment (DUNE), Far Detector Tech- nical Design Report, Volume IV: Far Detector Single-phase Technology, JINST 15 (2020) no.08, T08010 [arXiv:2002.03010]

arXiv 2020