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Benchmarking nuclear matrix elements of $0\nu\beta\beta$ decay with high-energy nuclear collisions

T0 review · 3 major / 4 minor · reviewed 2026-08-08 · deepseek-v4-flash

Pith's one-line read The nuclear matrix element for the neutrinoless double beta decay transition 150Nd→150Sm is strongly correlated with collective flow observables in ultra-central 150Nd+150Nd collisions, meaning collider measurements of those observables…

desk verdict A clever, honest proof-of-principle connecting 0νββ NMEs to heavy-ion flow, but the benchmark claim is only as strong as the assumption that β2 alone mediates the correlation. read the letter →

arxiv 2502.08027 v2 pith:BMS6IK22 submitted 2025-02-12 nucl-th hep-phnucl-ex

classification nucl-thhep-phnucl-ex PACS 23.40.-s25.75.-q
keywords neutrinolessdoublebetadecaynuclearmatrixelementcollectiveflowquadrupoledeformationcovariantdensityfunctionaltheory150Ndheavy-ioncollisionsBayesianuncertaintyquantification
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 paper proposes that high-energy nuclear collisions can serve as a new experimental benchmark for the nuclear matrix elements (NMEs) that govern neutrinoless double beta decay. Focusing on the 150Nd→150Sm transition, the authors combine a Bayesian sample of covariant density functional models with simulations of ultra-central 150Nd+150Nd collisions, and find that the NME is strongly correlated with the elliptic flow coefficient v2{2}, the fluctuation of mean transverse momentum δ[pT], their covariance, and the fourth-order cumulant v2{4}, with Pearson coefficients from -0.93 to +0.93. These correlations all trace back to the quadrupole deformation β2 of 150Nd, which both quenches the NME and shapes the quark-gluon plasma produced in the collision. If confirmed, collider flow measurements would supply a complementary, model-independent constraint on NME predictions, helping to interpret the next generation of double-beta decay experiments.

What carries the argument

The key object is the quadrupole deformation parameter β2, extracted from the B(E2) transition strength via the relation β2 = (4π)/(3ZR0²) √B(E2), which acts as a common cause: it quenches the NME (through the overlap of the initial and final nuclear states) and it enhances the spatial ellipticity ε2 and the energy-per-entropy ratio E/S of the quark-gluon plasma formed in an ultra-central collision. The chain connecting the NME to collider observables runs from the energy-density-functional parameters, through the ground-state wave functions and β2, into the initial-condition simulation that yields ε2 and E/S, and finally to the final-state elliptic flow v2 and mean transverse momentum [pT].

What would settle it

A calculation that extends the same Bayesian framework to include triaxial and octupole deformations and then re-evaluates the Pearson coefficients would settle whether the correlations survive; if |r| for cov($v2^{2}$,[pT]) drops below about 0.7, the collider benchmark would lose its quantitative resolving power.

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Extended reading notes

Core claim

The central claim is that the nuclear matrix element M0ν for the 0νββ decay of 150Nd is strongly anti-correlated with the quadrupole deformation β2 of the parent nucleus, and that the same β2 controls the magnitude of elliptic flow and transverse-momentum fluctuations in ultra-central 150Nd+150Nd collisions. By varying the parameters of the covariant energy density functional across a Bayesian sample and feeding the resulting nuclear shapes into initial-condition simulations, the authors obtain Pearson correlation coefficients of r = -0.93 for v2{2}, r = -0.91 for δ[pT], r = +0.93 for cov($v2^{2}$,[pT]), and r = -0.88 for v2{4} against the NME. They conclude that a measurement of these observables in high-energy collisions, with an experimental precision of about 1% or better, would pin down β2 and thereby benchmark theoretical NME predictions.

Load-bearing premise

The load-bearing premise is that the quadrupole deformation β2 taken from the measured B(E2) strength is the only nuclear-structure degree of freedom that matters for both the NME and the flow observables, so that triaxial, octupole, and radial-density variations do not decorrelate the two sides.

Editorial extensions

If this is right

  • A measurement of v2{2} in ultra-central 150Nd+150Nd collisions at the LHC or RHIC would directly constrain β2 of 150Nd, shrinking the spread of NME predictions.
  • The covariance cov(v2^2,[pT]) shows the largest variation with β2 (about 10%) and the strongest correlation with the NME (r = +0.93), making it the most sensitive single collider observable for this purpose.
  • Combining flow data from 150Nd+150Nd with a near-spherical reference such as 208Pb+208Pb suppresses quark-gluon-plasma uncertainties, so the proposed benchmark remains robust even without a perfectly faithful hydrodynamic model.
  • A short special run at the LHC of only a few hours, using detectors capable of ultra-central event selection, could collect enough statistics to measure v2{4} to about 1% precision, the level needed to distinguish among NME models.

Reading between the lines

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

  • The same logic should apply to other strongly deformed 0νββ candidates, such as 76Ge, 130Te, or 136Xe, as long as their quadrupole deformation produces a measurable flow signature; the paper only demonstrates the correlation for 150Nd.
  • A joint Bayesian fit of low-energy structure data and high-energy flow data would yield a substantially tighter posterior for β2 and hence for the NME than either dataset alone—this is the natural next step the authors sketch.
  • A negative result—flow observables that barely vary across the EDF sample—would signal that some other degree of freedom decorrelates the NME from geometry, and would therefore falsify the proposed benchmark.
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Editorial analysis

A structured set of objections, weighed in public.

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

Referee Report

3 major / 4 minor

Summary. The paper proposes that collective-flow measurements in ultra-central high-energy 150Nd+150Nd collisions can be used to benchmark the nuclear matrix element (NME) of the 0νββ decay transition 150Nd→150Sm. The authors generate ~10^3 samples of a relativistic covariant density functional by varying nine coupling constants around the PC-PK1 values, compute the MR-CDFT NME for each sample, and use the B(E2)-derived quadrupole deformation β2 (Eq. (4)) to initialize TRENTo simulations of 150Nd+150Nd collisions. They report strong Pearson correlations (|r| = 0.88–0.93) between the NME and initial-state proxies for v2, δ[pT], their covariance, and v2{4}, and argue that collider data can therefore constrain β2 and reduce NME uncertainty.

Significance. If the effect survives a more complete treatment, this is a genuinely new and complementary bridge between high-energy collider physics and neutrinoless double-beta decay, with concrete implications for the LHC ion program and for the interpretation of ton-scale 0νββ experiments. The workflow (Fig. 2) is clearly described, the forward-modeling logic is transparent, and the authors are explicit about the main limitations, which is commendable. The correlation coefficients are internally consistent with the stated model. However, the central claim is currently supported only within an axially symmetric, reflection-symmetric quadrupole model and for initial-state geometric quantities rather than full final-state observables; the robustness of the correlations to omitted shape degrees of freedom and to hydrodynamic response effects remains to be demonstrated.

major comments (3)
  1. [NME, nuclear structure, and heavy-ion collisions (Eq. (4); Fig. 3)] The collider-side input is reduced to a single scalar, β2, obtained from B(E2) via the rotor formula (4), while the MR-CDFT NME is computed from full projected wave functions that can in principle depend on triaxiality γ, octupole deformation β3, and higher multipoles. If the 10^3 EDF samples contain variations in these omitted degrees of freedom that affect M0ν but are not transmitted to the collision simulation, the correlations in Fig. 3(c)–(f) could be inflated or biased. The Summary acknowledges that octupole and triaxial deformation are 'expected to impact the values of the matrix elements,' but the manuscript does not quantify how much these omitted degrees of freedom decorrelate the NME from the flow proxies. This is load-bearing: without such a test, the claim that collider experiments can benchmark NMEs is demonstrated only within a restricted shape model. I recommend adding a sensitivity study that varies γ and β3 in both the NME and collision calculations (even for a subset of samples), or a formal argument for why β2 is a sufficient mediator.
  2. [Results and discussion (Eq. (9))] The observables labeled v2{2}, δ[pT], cov(v2^2,[pT]), and v2{4} are not actual final-state observables: they are the initial-state moments ⟨ε2^2⟩, ⟨(δ(E/S))^2⟩, ⟨ε2^2 δ(E/S)⟩, and 2⟨ε2^2⟩^2−⟨ε2^4⟩, mapped through linear-response relations v2 ∝ ε2 and [pT] ∝ E/S. The proportionality factors are assumed to be independent of the EDF parameters and therefore to cancel in relative variations. In practice the hydrodynamic response is weakly nonlinear and can depend on the shape of the initial profile, which changes with β2; final-state fluctuations also contribute to the measured cumulants, especially v2{4}. The reported Pearson coefficients therefore quantify correlations with initial-state geometry, not directly with measured flow observables. A validation for at least a few samples using a full hydrodynamic code, or a demonstration that published response parametrizations are insensitive to the EDF variations, would materially strengthen the claim that collider measurements, rather than just initial-state proxies, are correlated with the NME.
  3. [NME, nuclear structure, and heavy-ion collisions (sampling procedure)] The text states that the 10^3 EDF parameter sets are 'obtained by varying the nine parameters C around their optimal values of the PC-PK1 using quasi-Monte Carlo sampling with a uniform distribution [25]' and refers to a 'Bayesian analysis' in the Introduction and in Fig. 2. As written, this is a uniform parameter scan, not a posterior sample conditioned on the low-energy nuclear-structure data. The spread in M0ν and β2 and the derived 'theoretical uncertainty' are therefore prior-driven. Please clarify whether these samples are the posterior samples of Ref. [25]; if so, state the likelihood and the data used. If they are not posterior samples, the manuscript should avoid the term 'Bayesian' in describing the generation of the ensemble and should temper the conclusion that the spread represents the relevant theoretical uncertainty.
minor comments (4)
  1. [Fig. 3 caption] The caption lists '(d)' twice and omits '(e)'; the panel for cov(v2^2,[pT]) is not correctly labeled.
  2. [Introduction] There is a typo in the full text: 'effc-tive' should read 'effective'.
  3. [Eq. (9)] The pre-factors 1/2, 1/3, and 1/4 in Eq. (9) are introduced without derivation; please add a sentence or a reference explaining why these particular factors ensure that the observables can be meaningfully compared.
  4. [Summary and outlook] The statement that octupole and triaxial deformation should be included in future work appears only in the final paragraph; moving this caveat to the Results section would better calibrate the reader's expectations about the scope of the current correlations.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the reported flow–NME correlations are forward-model predictions from a shared EDF ensemble, not fits or definitions.

full rationale

The derivation chain is self-contained and non-circular. The NME M0ν is computed via MR-CDFT (Eqs. 1–3) for each EDF parameter set C. The quadrupole deformation β2 is obtained from the model’s B(E2) via Eq. (4) and then used to constrain the SR-CDFT intrinsic density that feeds the TRENTo initial-state simulation. The flow-related quantities in Eq. (6) are deterministic forward-model outputs of each β2; they are never fitted to the NME, and the NME is never defined in terms of the flow observables. The strong Pearson correlations in Fig. 3 emerge because both M0ν and the flow observables are strongly correlated with the same structural parameter β2 across the Bayesian ensemble—this is a physical propagation of sensitivity, not a circular reduction. The self-cited Bayesian analysis (Refs. [24, 25]) provides the ensemble of C and is a methodological input; the present paper recomputes both the NME and the flow observables from first principles within that ensemble, so the citation is not load-bearing for the correlation result. The Summary's caveat about omitted octupole and triaxial deformations is a model limitation that could dilute the correlation in a more complete theory, but it does not make the present derivation circular. No equation in the paper reduces to its own input, and no fitted parameter is relabeled as a prediction.

Assumptions & free parameters 2 free parameters · 6 assumptions · 0 invented entities

The central correlation claim rests on the assumed validity of the CDFT+TRENTo modeling chain and on the reduction of nuclear structure to a single quadrupole deformation parameter. No new physical entities are introduced. The free parameters are inherited model parameters, not fitted in this paper.

free parameters (2)
  • CDFT coupling constants C = {α_S, β_S, γ_S, δ_S, α_V, γ_V, δ_V, α_TV, δ_TV} = PC-PK1 values (not listed in text)
    Nine parameters of the relativistic energy density functional in Eq. (3); sampled via quasi Monte-Carlo around PC-PK1 to generate the 10^3 EDF parameter sets used in the Bayesian analysis.
  • TRENTo initial-condition parameters = Not stated in text; adopted from previous studies
    Parameters of the TRENTo model (e.g., nucleon width, fluctuation parameter, entropy deposition) that control the QGP initial entropy density; their values are inherited from prior calibrations and are not varied or listed.
assumptions (6)
  • domain assumption The MR-CDFT framework with the PC-PK1 functional provides accurate ground-state wave functions for 150Nd and 150Sm required to compute M0ν.
    Invoked when using Eq. (2) to construct the nuclear states; the reliability of the functional and many-body truncation is assumed from previous work [24,25,54].
  • domain assumption The 0νββ decay operator is the standard light-Majorana-neutrino-exchange operator, with two-body currents and the contact operator neglected.
    Stated after Eq. (1); two-body currents are known to reduce the NME by ~10% (Ref. [52]), so this simplification biases the absolute NME but not necessarily the correlations.
  • ad hoc to paper The intrinsic quadrupole deformation of the nucleus for the collision simulation is correctly obtained from the B(E2) value via Eq. (4), with R0 = 1.2 A^1/3 fm.
    This mapping connects the low-energy observable to the high-energy initial state and is central to the correlation chain; it assumes a rigid rotor relation between B(E2) and β2.
  • domain assumption TRENTo initial conditions with an ideal-gas energy-density prescription e ∝ s^(4/3) describe the QGP initial state at √sNN = 5 TeV.
    Used in Eq. (5) and the simulation setup; standard in heavy-ion phenomenology, but the paper does not test sensitivity to this choice.
  • domain assumption Final-state flow observables are linearly proportional to the initial-state quantities ε2 and E/S, so relative variations in the observables can be computed without full hydrodynamic evolution.
    Invoked for Eq. (9); supported by Refs. [70-74] but only approximately true, especially for the covariance observable.
  • ad hoc to paper Triaxial and octupole deformations of 150Nd can be neglected in this first study.
    Acknowledged in the Summary as a limitation; both NME and flow are expected to depend on these degrees of freedom, so this is a load-bearing simplification.

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Cite this review

Pith. "Pith review of Benchmarking nuclear matrix elements of $0\nu\beta\beta$ decay with high-energy nuclear collisions." pith.science (2026). https://pith.science/paper/BMS6IK22

@misc{pith2026250208027,
  author       = {Pith},
  title        = {Pith review of: Benchmarking nuclear matrix elements of $0\nu\beta\beta$ decay with high-energy nuclear collisions},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/BMS6IK22}},
  note         = {Machine review of arXiv:2502.08027}
}
abstract

Reducing uncertainties in the nuclear matrix elements (NMEs) remains a critical challenge in designing and interpreting experiments aimed at discovering neutrinoless double beta ($0\nu\beta\beta$) decay. Here, we identify a class of observables, distinct from those employed in low-energy nuclear structure applications, that are strongly correlated with the NMEs: momentum correlations among hadrons produced in high-energy nuclear collisions. Focusing on the $^{150}$Nd$\rightarrow$$^{150}$Sm transition, we combine a Bayesian analysis of the structure of $^{150}$Nd with simulations of high-energy $^{150}$Nd+$^{150}$Nd collisions. We reveal prominent correlations between the NMEs and features of the quark-gluon plasma (QGP) formed in these processes, such as spatial gradients and anisotropies, which are accessible via collective flow measurements. Our findings demonstrate collider experiments involving $0\nu\beta\beta$ decay candidates as a platform for benchmarking theoretical predictions of the NMEs.

Figures

Figures reproduced from arXiv: 2502.08027 by the authors.

Figure 1
Figure 1. FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2. Flow chart of our framework that combines the results of a [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗

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Forward citations

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