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The NUCLEUS experiment projects that a 7 g CaWO4 target at Chooz can detect coherent elastic neutrino-nucleus scattering at 4.7σ in one year, provided the low-energy excess is suppressed to negligible levels.

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2026-08-04 05:39 UTC pith:WPNBIABF

load-bearing objection A solid, transparent sensitivity study whose technical-run BSM projections are worth taking seriously; the physics-run '4.7σ' is honestly conditioned on an unproven LEE suppression, so read the fine print before quoting it. the 2 major comments →

arxiv 2603.24450 v1 pith:WPNBIABF submitted 2026-03-25 hep-ex hep-ph

Prospect of the NUCLEUS Experiment at Chooz for Coherent Elastic Neutrino-Nucleus Scattering and New Physics Searches

H. Abele , G. Angloher , B. Arnold , M. Atzori Corona , A. Bento , E. Bossio , F. Buchsteiner , J. Burkhart
show 57 more authors
F. Cappella M. Cappelli N. Casali R. Cerulli A. Cruciani G. Del Castello M. del Gallo Roccagiovine S. Dorer A. Erhart M. Friedl S. Fichtinger V.M. Ghete M. Giammei C. Goupy J. Hakenm\"uller D. Hauff F. Jeanneau E. Jericha M. Kaznacheeva H. Kluck A. Langenk\"amper T. Lasserre D. Lhuillier M. Mancuso R. Martin B. Mauri A. Mazzolari L. McCallin H. Neyrial C. Nones L. Oberauer L. Peters F. Petricca W. Potzel F. Pr\"obst F. Pucci F. Reindl M. Romagnoni J. Rothe N. Schermer J. Schieck S. Sch\"onert C. Schwertner L. Scola G. Soum-Sidikov L. Stodolsky A. Schr\"oder R. Strauss R. Thalmeier C. Tomei L. Valla M. Vignati M. Vivier A. Wallach P. Wasser A. Wex L. Wienke (NUCLEUS Collaboration)
This is my paper
classification hep-ex hep-ph
keywords coherent elastic neutrino-nucleus scatteringCEνNSreactor neutrinoscryogenic calorimeterslow-energy excessweak mixing angleneutrino charge radiuslight mediator searches
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 a gram-scale cryogenic detector placed near a nuclear reactor can observe coherent elastic neutrino-nucleus scattering at the lowest recoil energies yet attempted, compensating for its tiny target mass by detecting events down to about 20 eV. The key trick is a likelihood that combines each event's recoil energy with the time-varying reactor power, allowing signal to be separated from background even when the signal is far smaller than the background. If the unexplained low-energy excess seen during commissioning can be suppressed, the collaboration projects a 4.7σ observation with roughly 20% statistical precision in one year, enough to measure the weak mixing angle at an unprecedentedly low momentum transfer and to place competitive bounds on the neutrino charge radius, light mediators, non-standard interactions, and the neutrino magnetic moment. The paper also shows that even before the excess is fully removed, the technical run can already constrain several new-physics scenarios purely from the reactor-power modulation.

Core claim

The central claim is that ultra-low recoil thresholds plus reactor-power variation can make a 7 g CaWO4 target competitive with much larger CEνNS detectors. Assuming complete suppression of the low-energy excess, the paper projects a median discovery significance of 4.7σ for the Standard Model CEνNS signal, corresponding to about 58 expected events and a statistical uncertainty near 20% on the cross section. The projected 1σ interval for the weak mixing angle is 0.187 < sin2θW(Q ≈ 5 MeV) < 0.286, the lowest-momentum-transfer CEνNS determination to date. The same framework yields a 90% CL range for the neutrino charge radius of (−8.3 to 5.6) × 10⁻³² cm², sensitivity to universal light mediato

What carries the argument

The central analysis tool is an unbinned profile likelihood in which the signal rate is proportional to the time-dependent effective reactor thermal power P(t), while the background has its own temporal behavior—a decaying low-energy excess during the technical run or a constant simulated particle background during the physics run. Each recorded event enters with both its arrival time and its recoil energy, so the signal is identified by its correlation with reactor power and by its predicted CEνNS spectral shape. The profile-likelihood ratio is validated on pseudo-experiments and used to derive discovery significances, confidence intervals, and upper limits.

Load-bearing premise

The physics-run projections assume the unexplained low-energy excess — a sub-keV background seen during commissioning — can be suppressed to a negligible level, and the paper explicitly labels this an optimistic scenario reliant on an instrumented holder that is still under development.

What would settle it

Take data during a several-week period when both reactors are off: under the paper's model the CEνNS signal disappears while the particle background stays constant, so the observed event-rate modulation with reactor power must track the predicted 85% duty cycle and the one-third/two-thirds power steps. If the measured low-energy rate above 20 eV does not drop to the simulated particle-background level once the instrumented holder is installed, the 4.7σ projection and the derived weak-mixing-angle and charge-radius intervals collapse.

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

If this is right

  • If the low-energy excess is suppressed as assumed, a 7 g target can achieve a 4.7σ CEνNS observation in one year, demonstrating that extremely low thresholds can substitute for large target mass.
  • The measurement would provide the lowest-momentum-transfer determination of the weak mixing angle from CEνNS, probing electroweak running at Q ≈ 5 MeV.
  • The projected neutrino charge-radius constraint would be among the most stringent from CEνNS and is complementary to accelerator-source measurements because reactor fluxes are dominated by electron antineutrinos.
  • The physics run would probe previously unexplored light-mediator parameter space, particularly for mediator masses between roughly 0.1 and 10 MeV.
  • Even the technical run, without a CEνNS detection, could place a more stringent CEνNS-based limit on the neutrino magnetic moment than existing measurements, thanks to the 1/T enhancement at low recoil energies.

Where Pith is reading between the lines

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

  • The same reactor-power-modulation likelihood could be applied to any low-threshold detector sited at a reactor with scheduled outages, effectively turning reactor downtime into a background-subtraction tool without dedicated reactor-off runs.
  • The paper's most fragile phenomenological input is the assumption that the low-energy excess does not scale with target mass or with the shallow-site cosmic-ray flux; if that assumption fails, the technical-run BSM bounds would need to be recomputed.
  • A natural extension is to fold the double-TES coincidence information directly into the likelihood as an additional discriminating observable, which could improve the technical-run sensitivity even before full low-energy-excess suppression.
  • The projected 20% statistical precision is robust to the dominant systematics in this analysis, but the 25% energy-scale uncertainty assumed from commissioning data would shift the extracted CEνNS normalization by roughly +0.5/−4.0%, which could become important for any future higher-mass exposure.

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. This paper presents sensitivity projections for the NUCLEUS experiment at the Chooz reactor, using a data-driven model of the low-energy excess (LEE) observed during the TUM commissioning run and an unbinned likelihood that exploits both reactor-power time variation and recoil-energy spectra. For the Technical Run (7 g CaWO4, LEE-dominated), the authors project a 90% CL sensitivity to the SM CEνNS rate of about 35 times the Standard Model prediction, and competitive BSM limits on light mediators and the neutrino magnetic moment without requiring a CEνNS observation. For the Physics Run, under an explicit assumption that the LEE is suppressed to a negligible level, they project a 4.7σ CEνNS discovery, a low-momentum-transfer weak-mixing-angle interval, a neutrino charge-radius constraint, and improved BSM sensitivities. The statistical framework is validated with large ensembles of pseudo-experiments, and the dominant systematics (energy scale, reactor flux, thermal power) are quantified.

Significance. If the physics-run premise is realized, this would be a substantial result: a gram-scale cryogenic detector would provide the first ultra-low-threshold reactor CEνNS measurement and competitive electroweak/BSM constraints. The paper has real strengths: the likelihood framework is carefully tested with 5,000–10,000 pseudo-experiments and asymptotic quantiles are checked; the technical-run projections are based on commissioning data and are explicitly independent of a CEνNS detection; and the dominant systematic uncertainties are treated quantitatively. However, the headline physics-run claims rest entirely on an unverified experimental premise — complete suppression of the LEE — for which the paper provides no completed measurement and no quantitative requirement. The technical-run results are credible and useful, but the physics-run claims need either substantial additional justification or an explicit demotion to an idealized sensitivity upper bound.

major comments (2)
  1. [Sec. III A 3 and Table I] The Physics Run projections — 4.7σ CEνNS, Eq. (17) for sin²θW, Eq. (18) for the charge radius, and the physics-run BSM bounds — depend entirely on the assumption that the LEE is reduced to a negligible level. The paper does not quantify what 'negligible' requires. From Eq. (13), with R0,LEE=3650 events/day per detector and k=0.59, the four-detector LEE rate after one year is ~4×3650×365^−0.59 ≈ 450 events/day, whereas the expected signal and particle background are 0.23 and 0.38 events/day (Table I). Keeping residual LEE below, say, 10% of the particle background therefore demands a suppression factor of ~10^4 relative to the initial commissioning rate. The only cited support is an inner veto 'currently under development' [35,36] and ongoing studies [34]; no completed measurement or prototype demonstration shows such suppression. The authors should either provide a quantitative suppressi
  2. [Sec. III A 2] The Technical Run sensitivity assumes the commissioning LEE initial rate of 3650 events/day applies unchanged to each 1.75 g detector, despite the commissioning detector having 0.76 g mass, and at the Chooz site with different overburden. The paper cites external observations supporting no mass scaling, but this remains a load-bearing assumption for the technical-run BSM limits (Figs. 5–6): if the LEE scales with target mass or surface area, the projected 90% CL limits weaken correspondingly. I recommend adding a sensitivity scan over a mass-scaling exponent, or at minimum a clear quantitative statement of how the limits change under a plausible range of scaling behaviors.
minor comments (4)
  1. [App. A 2] The text says the discovery significance uses q0 = q(α=0) from pseudo-experiments 'generated under the SM hypothesis'. This is correct for a median expected significance, but the wording is ambiguous; clarify that the signal+background hypothesis is used to compute the expected median, while a background-only ensemble would be needed for a p-value.
  2. [Sec. III B] The reactor-power schedule is assumed with an 85% duty cycle and a specific pattern of single- and double-reactor outages. The paper says this is representative of historical data, but no robustness scan over duty cycle or outage timing is shown. Since the time-modulation term is central to the likelihood, a brief sensitivity check would be useful.
  3. [Sec. III A 2] The LEE spectral parameters f, ε1, ε2 and the decay exponent k are quoted from fits to commissioning data without uncertainties. Given that they are profiled in the Technical Run fit, the paper should state whether the quoted values are central values of a fit and how the sensitivity changes if these parameters are varied within their uncertainties.
  4. [Sec. IV A] The statement that the weak-mixing-angle interval is a 'determination' at the lowest momentum transfer probed to date is technically true, but the interval 0.187 < sin²θW < 0.286 is wide. A sentence emphasizing the large uncertainty and the role of the neutron-dominated weak charge would help calibrate expectations.

Circularity Check

0 steps flagged

No significant circularity: the projections are conditional sensitivity forecasts built from measured background inputs and SM cross sections, not fitted to their own endpoints.

full rationale

The paper is a sensitivity projection, not a measurement claim. The CEνNS signal rate is computed from the SM differential cross section (Eq. 1) convolved with an external reactor flux model [23] and a detector response (Eqs. 10-11). No parameter is fitted to the claimed 4.7σ outcome or to the BSM limits. The LEE background model (Eqs. 12-13) is taken from the collaboration's commissioning data [29] and LEE characterization [34]; this is a data-driven background input, not a result derived from the SM or BSM hypotheses. The Technical Run ~35×SM sensitivity and Physics Run 4.7σ significance are obtained from pseudo-experiments generated from these assumed models and a standard profile-likelihood ratio, and the paper explicitly labels the Physics Run as an 'optimistic scenario' with 'complete suppression of the LEE' (Sec. III A 3 and abstract), so the central claim is a conditional projection rather than a postdiction. BSM sensitivities are benchmarked against external experiments (COHERENT, CONUS+, XENONnT, TEXONO, etc.), not against the paper's own fitted values. The unverified LEE suppression is an experimental premise and a stated limitation, but it is not a circular derivation. The self-citations are data/model inputs or ongoing-development references, and none serves as a uniqueness theorem or ansatz that forces the claimed result.

Axiom & Free-Parameter Ledger

6 free parameters · 7 axioms · 0 invented entities

No new theoretical entities are introduced; the universal light mediator, NSI operators, neutrino magnetic moment, and charge radius are existing BSM/SM constructs borrowed for sensitivity projections. The free parameters are all either fitted to commissioning data or chosen as conservative assumptions for the projected runs.

free parameters (6)
  • LEE spectral shape f, ε1, ε2 = f≈0.99, ε1≈28 eV, ε2≈320 eV
    Fit to NUCLEUS commissioning CaWO4 data over 35–7000 eV; used to build the Technical Run background energy PDF (Eq. 12, Sec. III A 2).
  • LEE initial rate R0,LEE = 3650 events/day per detector (35–500 eV)
    Adopted from single-TES commissioning detector and applied to all four Technical Run detectors without mass scaling (Sec. III A 2).
  • LEE decay exponent k = ≈0.59
    Fit to commissioning-run time dependence (Eq. 13); sets Technical Run background time evolution.
  • Overall analysis efficiency = 80%
    Flat efficiency for live time and analysis selection applied to all one-year projections (Sec. IV).
  • Energy resolution parameters η/e_ath, β, σ0 = 0.0045±0.0016 meV^-1, 0.013±0.0011, 4 eV
    From detector calibration studies [71] and assumed baseline resolution; affects signal smearing near threshold (Eq. 11).
  • Energy-scale systematic δ = ±25%
    Conservative absolute energy-scale uncertainty from commissioning LED-vs-Cu-X-ray discrepancy; propagated as +0.5/-4.0% signal bias (App. B).
axioms (7)
  • standard math Standard Model CEνNS cross section and weak couplings (Eqs. 1–4) are valid, with g_p^V(νe)=0.0379 and g_n^V=-0.5117.
    Foundation of signal prediction; taken from prior theory (Freedman 1974, PDG, etc.).
  • domain assumption Reactor antineutrino spectrum and fission fractions follow Ref. [23], with integrated flux (2.15±0.08)×10^12 cm^-2 s^-1 at full power.
    External flux model adopted; signal normalization scales with flux.
  • ad hoc to paper LEE rate does not scale with target mass and is the same at Chooz as during TUM commissioning.
    Sec. III A 2; critical for Technical Run background rate; supported only by observations in other cryogenic experiments, not by a NUCLEUS measurement at Chooz.
  • ad hoc to paper LEE can be suppressed to a negligible level in the Physics Run by inner veto and other strategies.
    Sec. III A 3 and abstract; the entire physics-run claim rests on this untested premise.
  • domain assumption Particle background at VNS is correctly estimated by Geant4 simulations of the shielding/veto system [24] and is constant in time.
    Used as Physics Run background model; not validated by in-situ data at Chooz.
  • standard math Nuclear form factors are negligible at sub-keV recoil; Helm parametrization with Lewin-Smith radii is adequate.
    Sec. II A; supports treating the signal as fully coherent and the weak-angle extraction as clean.
  • domain assumption Detector response is Gaussian with energy-dependent width (Eq. 11) and no extra trigger efficiency beyond resolution folding.
    Based on [71] and the commissioning analysis [29].

pith-pipeline@v1.3.0-alltime-deepseek · 26801 in / 13207 out tokens · 138521 ms · 2026-08-04T05:39:47.674127+00:00 · methodology

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read the original abstract

The NUCLEUS experiment aims to measure coherent elastic neutrino-nucleus scattering (CE$\nu$NS) at unprecedentedly low nuclear recoil energies using gram-scale cryogenic calorimeters operated at the Chooz nuclear power plant in France. Access to recoil energies at the $\mathcal{O}(10~\mathrm{eV})$ scale enables CE$\nu$NS studies at extremely low momentum transfer and provides enhanced sensitivity to new physics. In this work, we present sensitivity projections for the upcoming NUCLEUS technical and physics runs, incorporating a data-driven treatment of the low-energy excess (LEE) observed during commissioning. We develop a likelihood framework that exploits reactor-power variation to disentangle signal and background in a low signal-to-background regime and to assess the impact of the dominant systematic uncertainties. For the Technical Run with a 7 g CaWO$_4$ target, we find competitive sensitivity to several scenarios beyond the Standard Model, which do not require a CE$\nu$NS observation. For the Physics Run, assuming complete suppression of the LEE, we project a 4.7 $\sigma$ observation of CE$\nu$NS with a statistical precision of about 20 % in 1 year, enabling a determination of the weak mixing angle at the lowest momentum transfer probed to date with CE$\nu$NS and leading CE$\nu$NS-based constraints on the neutrino charge radius and new mediator models.

Figures

Figures reproduced from arXiv: 2603.24450 by A. Bento, A. Cruciani, A. Erhart, A. Langenk\"amper, A. Mazzolari, A. Schr\"oder, A. Wallach, A. Wex, B. Arnold, B. Mauri, C. Goupy, C. Nones, C. Schwertner, C. Tomei, D. Hauff, D. Lhuillier, E. Bossio, E. Jericha, F. Buchsteiner, F. Cappella, F. Jeanneau, F. Petricca, F. Pr\"obst, F. Pucci, F. Reindl, G. Angloher, G. Del Castello, G. Soum-Sidikov, H. Abele, H. Kluck, H. Neyrial, J. Burkhart, J. Hakenm\"uller, J. Rothe, J. Schieck, L. McCallin, L. Oberauer, L. Peters, L. Scola, L. Stodolsky, L. Valla, L. Wienke (NUCLEUS Collaboration), M. Atzori Corona, M. Cappelli, M. del Gallo Roccagiovine, M. Friedl, M. Giammei, M. Kaznacheeva, M. Mancuso, M. Romagnoni, M. Vignati, M. Vivier, N. Casali, N. Schermer, P. Wasser, R. Cerulli, R. Martin, R. Strauss, R. Thalmeier, S. Dorer, S. Fichtinger, S. Sch\"onert, T. Lasserre, V.M. Ghete, W. Potzel.

Figure 1
Figure 1. Figure 1: FIG. 1. Expected event rate in the NUCLEUS CaWO [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: shows an example pseudo-experiment for the Technical Run configuration, illustrating the re￾sulting time and energy distributions of signal and background events. For each pseudo-experiment, parameter inference is performed using a profile like￾lihood ratio test statistic [78], q(θ) = −2 log L(θ, ˆνˆ) L( ˆθ, νˆ) , (16) where θ denotes the parameter of interest (e.g. the CEνNS signal normalization or a BSM … view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Projected sensitivity of the NUCLEUS experi [PITH_FULL_IMAGE:figures/full_fig_p010_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Projected sensitivity of the NUCLEUS exper [PITH_FULL_IMAGE:figures/full_fig_p011_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Projected sensitivity of the NUCLEUS experiment to a universal light mediator model ( [PITH_FULL_IMAGE:figures/full_fig_p012_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Projected sensitivity of the NUCLEUS ex [PITH_FULL_IMAGE:figures/full_fig_p013_6.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. Distributions of reconstructed best-fit parameters and their pairwise correlations for the [PITH_FULL_IMAGE:figures/full_fig_p015_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9 [PITH_FULL_IMAGE:figures/full_fig_p016_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10. Median profile-likelihood ratio test statistic as [PITH_FULL_IMAGE:figures/full_fig_p016_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11. Median profile-likelihood ratio test statistic as a [PITH_FULL_IMAGE:figures/full_fig_p017_11.png] view at source ↗

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Forward citations

Cited by 3 Pith papers

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