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REVIEW 3 major objections 6 minor 107 references

The determination of potential scales in 2+1 flavor QCD

T0 review · 3 major / 6 minor · reviewed 2026-08-11 · deepseek-v4-flash

Pith's one-line read Lattice QCD determines the hadronic scales r0 and r1 from the static force at the physical point, with r0 = 0.4729(57)(48) fm, r1 = 0.3127(24)(32) fm, and r0/r1 = 1.532(12).

desk verdict New r0 and r1 values for CLS 2+1 QCD are trustworthy, but the abstract disagrees with the main text on r0 and the finest-spacing gap model needs explicit clarification. read the letter →

arxiv 2412.10215 v2 pith:KFRLLAX3 submitted 2024-12-13 hep-lat

classification hep-lat
keywords latticeQCDstaticpotentialhadronicscaler0r1Wilsonloopsforcetree-levelimprovementcontinuumextrapolation
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

The paper aims to pin down the hadronic length scales r0 and r1, defined by the strength of the static quark-antiquark force at two reference distances, directly from lattice QCD with dynamical up, down, and strange quarks. These scales are widely used to convert lattice measurements into physical units, so precise values improve the comparability of many lattice results. The analysis extracts the static force from Wilson loops, uses a tree-level improved distance to suppress lattice artifacts, and extrapolates data at five lattice spacings and pion masses from 134 to 420 MeV to the continuum and physical mass limits. It reports r0 = 0.4729(57)(48) fm, r1 = 0.3127(24)(32) fm, and r0/r1 = 1.532(12), and as a byproduct converts the three-flavor QCD Lambda parameter to r0 units, obtaining r0 Lambda_MSbar^(3) = 0.820(28).

What carries the argument

The central object is the static quark-antiquark force F(r) = dV(r)/dr, computed from Wilson loops through a generalized eigenvalue problem, with lattice artifacts removed at tree level by replacing the separation r with an improved distance r_I chosen so that the tree-level continuum relation $r_I^{2}$ F_tree(r_I) = C_F $g0^{2}$/(4 pi) holds exactly. The scales r0 and r1 are defined through $r_i^{2}$ F(r_i) = c_i. The argument is carried by this improved force together with a two-step excited-state analysis: a global model for the energy gap $\Delta$ between the ground and first excited state is fitted on stable ensembles and then used to stabilize effective-mass fits on all ensembles, including the problematic near-physical-mass fine ensemble where the direct fit was unstable. Continuum and chiral limits are obtained by Akaike-weighted averages over four fit forms and several data cuts, with explicit checks of logarithmic scaling violations.

What would settle it

Repeat the analysis on the same ensembles with a purely data-driven determination of the first excited state, for example a full multi-exponential fit with a larger variational basis or a multilevel algorithm for dynamical fermions, and compare the resulting r1 at the physical point with 0.3127(24)(32) fm. A deviation larger than the combined error would show that the assumed gap model biases the ground-state potential.

Watch

Extended reading notes

Core claim

The central claim is that the hadronic scales r0 and r1 can be computed at the physical point of 2+1 flavor QCD with controlled statistical and systematic errors, using the tree-level improved static force F(r) extracted from Wilson loops. The scale r_i is defined by $r_i^{2}$ F(r_i) = c_i with c0 = 1.65 and c1 = 1, so these distances mark where the force takes a reference strength. Combining measurements on ensembles with five lattice spacings down to 0.039 fm and pion masses from 134 to 420 MeV, continuum and chiral extrapolations yield the values quoted above, with agreement across different fit ansatze and data cuts. The paper also shows that the shape parameter of the potential, c(r) = (1/2) $r^{3}$ V''(r), is distance-dependent in the probed range and follows a screened-logarithmic potential curve rather than the constant-shape model, indicating sensitivity to sea-quark effects.

Load-bearing premise

The analysis assumes that the energy gap between the ground state and first excited state of the Wilson-loop correlation functions follows a single four-parameter curve as the quark separation, pion mass, and lattice spacing vary; if that curve is wrong on the ensembles where the direct fit is unstable, the extracted potential, and therefore r0 and r1, would be biased.

Editorial extensions

If this is right

  • The reported r0 and r1 values give an absolute scale in fm for 2+1 flavor ensembles, so other lattice quantities measured on them can be converted from lattice units to physical units with these numbers.
  • Since r0/sqrt(t0) = 3.277(39) and r1/sqrt(t0) = 2.167(16), potential scales and gradient flow scales are now cross-calibrated, allowing direct comparison of scale-setting between the two conventions.
  • The value r0 Lambda_MSbar^(3) = 0.820(28) ties the nonperturbatively computed three-flavor Lambda parameter to a hadronic scale, offering a scale-setting-free comparison point for determinations of the strong coupling.
  • The ratio r0/r1 = 1.532(12) is a purely gluonic observable nearly independent of quark masses, so it can serve as a stringent test for other lattice actions and for effective field theory descriptions of the static potential.

Reading between the lines

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

  • If the quoted values hold, the r0/r1 ratio becomes a sharper cross-check of scale-setting than either scale alone, because the ratio is independent of the overall fm conversion and of sqrt(t0). A direct re-determination of r0/r1 on the same ensembles with a completely independent excited-state treatment would confirm whether the assumed gap model biases the force near r1.
  • The observation that the shape parameter c(r) is distance-dependent rather than constant suggests that phenomenological potential models used for heavy-quarkonium spectra may need a distance-dependent curvature term; this could be tested against charmonium spectra or against future 2+1+1 flavor determinations with a dynamical charm quark.
  • The E300-excluded analysis shifts r1 by about 0.002 fm, within the quoted error. A targeted reanalysis of that ensemble with larger statistics or multilevel algorithms for dynamical fermions would settle whether the outlier is a statistical fluctuation or a sign of a small systematic effect.
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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 / 6 minor

Summary. The paper determines the hadronic scales r0, r1 and their ratio in Nf=2+1 QCD from the static force measured with Wilson loops on 18 CLS ensembles covering five lattice spacings and pion masses from 134 to 420 MeV. The analysis uses a tree-level improved distance, a GEVP with HYP smearing, and a two-step procedure in which an empirical model for the excited-state gap (eq. 4.10) is fitted per lattice spacing and used to stabilize linear fits for problematic ensembles. The scales are extrapolated to the continuum and physical pion mass with four fit ansatze, several data cuts, logarithmic correction tests, and AIC averaging. The final results are r0=0.4729(57)(48) fm, r1=0.3127(24)(32) fm, r0/r1=1.532(12), plus a byproduct r0 Lambda_MSbar^(3)=0.820(28). The paper also studies the shape parameter c(r) and compares it to potential models.

Significance. If the identified gap-model issue for the finest lattice spacing is resolved, the paper provides a competitive, independent determination of r0 and r1 with a transparent error budget. Its strengths are the multiple cross-checks: three interpolation forms for the force, a pencil-of-functions analysis for the difficult E300 ensemble, four continuum/chiral fit ansatze, data cuts, logarithmic correction tests, and AIC weighting. The direct continuum extrapolation of r0/Lhad to obtain r0 Lambda is elegant and avoids a double continuum extrapolation. The results agree with the FLAG averages within errors, and the r0/r1 ratio is a valuable constraint for scale setting.

major comments (3)
  1. [4.3, Eq. (4.10)] The gap model in Eq. (4.10) contains two terms, -delta_hat0/(r sqrt(t0)) and -gamma_hat0 sqrt(t0)/r, which are linearly dependent for any single ensemble because sqrt(t0) is a fixed number in lattice units. With only one stable ensemble at beta=3.85 (J500), the parameters b_hat0, delta_hat0, and gamma_hat0 cannot be identified from the data. The manuscript does not state how Delta was assigned to J501, whose r1 plateau is described as problematic in Section 4.4, and no J501-excluded analysis is provided analogous to the E300 cut. If J501's r1/a in Table 5 was obtained with the constrained linear fit using Delta from this model, the finest-spacing continuum point inherits an unconstrained extrapolation in m_pi; please clarify the fitting procedure at beta=3.85 and add a J501-removed cross-check.
  2. [Abstract vs. Section 6.1] The abstract quotes r0 = 0.4757(64) fm, while Eq. (6.1) quotes r0 = 0.4729(57)(48) fm, and Table 6 indicates that the AIC average gives the latter value. These differ by about 0.003 fm, which is within the combined errors but is still an internal inconsistency in the primary result; the abstract should be updated to the final value or the discrepancy should be explained.
  3. [Table 6 and Section 5] For r1, all the global fits have chi^2/dof around 2.0 (e.g., Fit 1 with no cuts gives 30.4/15), which is poor for a fit with this number of degrees of freedom and indicates that the mass and lattice-spacing ansatz does not fully describe the r1 data. Since r1 is one of the two main results, the authors should either identify the source of the poor chi^2 and show that the fit is stable without the offending ensemble, or add a fit-systematic uncertainty that reflects the poor goodness of fit.
minor comments (6)
  1. [Figure 8 caption] The caption says 'On the left the values r0/sqrt(t0) and the right r0/sqrt(t0)' but the right panel appears to show r1/sqrt(t0); please correct the typo.
  2. [Section 4.4 title] The title 'Evalution of exceptionally problematic ensembles' contains a misspelling and should read 'Evaluation'.
  3. [Section 5, first paragraph] The phrase 'inter1 -extrapolation' appears to be a typo for 'inter-/extrapolation'.
  4. [Section 4.3] Please define the parameters delta_hat0, gamma_hat0, and b_hat0 in Eq. (4.10), and state the r-range used in the global fit, since the text notes that the first datapoints with large lattice artifacts were excluded from the fit.
  5. [Table 1] The entries for H102-1 and N300-1 do not list the hopping parameters (kappa_u,d, kappa_s) even though those values are needed to reproduce the ensembles; please add them or state that they are the same as the preceding row.
  6. [Introduction, references] The citation sequence in the introduction, '[18, 19, 19, 20] [21, 22]', contains a duplicated reference number and an unusual gap; please check the bibliography and correct the citation order.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity; the scales are derived directly from the static-force definition and external inputs are independent.

full rationale

The derivation is self-contained: r0/a and r1/a are extracted from the GEVP effective masses of Wilson loops and converted to physical values via the defining force condition r_i^2 F(r_i)=c_i (eq. 2.8) and the tree-level improved distance of section 4.2; the final physical-point values (eqs. 6.1-6.3) follow from continuum/chiral fits (section 5) whose parameters are fit to the measured lattice data, not to any previous r0/r1 determination. The only external inputs are sqrt(t0) in fm from the CLS scale-setting work [48] and the ALPHA Lhad*Lambda value [100]; both are independent, externally constrained quantities and are used only to convert the dimensionless ratios or to re-express the ALPHA result in r0 units (section 6.2), which the paper explicitly labels a byproduct. The excited-state gap model (eq. 4.10) is an intermediate fit used to stabilize plateau determination on difficult ensembles; it is calibrated on ensembles with stable fits, applied to E300 and J501, and its impact is probed by the E300-excluded analysis reported in section 6.1. No equation in the paper reduces an output to an input by construction, and no load-bearing argument depends on a self-citation chain.

Assumptions & free parameters 4 free parameters · 6 assumptions · 0 invented entities

The central claim rests on the standard lattice QCD framework plus two fitted analysis layers: the global gap model (eq. 4.10) and the continuum/chiral extrapolation forms (eqs. 5.2-5.5). No new entities are introduced. The conversion to physical units uses √t0 from a prior CLS paper with overlapping authors, which is a mild self-citation but not a circular derivation.

free parameters (4)
  • Gap model parameters (Δhat_0, δhat_0, γhat_0, bhat_0) = fitted per lattice spacing, not tabulated in text
    Eq. (4.10); fitted to effective masses on ensembles where the direct three-parameter fit is stable, then used to fix the excited-state gap on all ensembles, including problematic ones like E300.
  • Force interpolation coefficients (fhat_0, fhat_1, fhat_2) = per ensemble and per scale
    Eqs. (4.11)-(4.12); local fits to F(r) r^2 used to locate r0 and r1.
  • Continuum/chiral fit coefficients c_i (Fits 1-4) = values in Table 6 (as r0, r1 results)
    Eqs. (5.2)-(5.5); fitted to extrapolate to the physical point and continuum limit.
  • AIC weights = derived from χ² per fit/cut
    Eq. (5.7); used to average fit results; final values exclude the coarsest lattice spacing.
assumptions (6)
  • domain assumption The static potential V(r) can be extracted from the GEVP of Wilson loop correlation functions with a spectral decomposition; the ground state dominates after the fitted exponentials are removed.
    Section 4.1-4.3, eq. (4.2).
  • domain assumption The tree-level improved distance r_I defined by eq. (4.5)-(4.6) removes the dominant lattice artifacts of the static force; residual artifacts are O(a²) with logarithmic corrections.
    Section 4.2, following [1,24].
  • domain assumption Continuum and chiral extrapolations assume lattice artifacts of the form (a/rsym)^2 (or with log terms) and quark mass dependence linear in (r0 mπ)^2 or φ2, with mistuning corrections linear in (1.098-φ4).
    Section 5, eqs. (5.2)-(5.5).
  • ad hoc to paper The global gap model eq. (4.10) (excited energy approximately constant in r, with 1/r and linear mπ² terms) describes the excited-state gap on all ensembles.
    Section 4.3; this is a fitted model introduced in this paper.
  • domain assumption The physical value of √t0 in fm from [48] and the ALPHA value Lhad Λ^(3) from [100] are correct inputs.
    Sections 5 and 6.2; these are external inputs from the cited literature.
  • domain assumption Ignoring quark-mass mistuning for gluonic observables is valid at the current precision.
    Section 3; justified by the D450 example (0.46 per mille shift).

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Pith. "Pith review of The determination of potential scales in 2+1 flavor QCD." pith.science (2026). https://pith.science/paper/KFRLLAX3

@misc{pith2026241210215,
  author       = {Pith},
  title        = {Pith review of: The determination of potential scales in 2+1 flavor QCD},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/KFRLLAX3}},
  note         = {Machine review of arXiv:2412.10215}
}
abstract

We calculate the hadronic scales $r_0$, $r_1$ and their ratio $r_0/r_1$ on $N_{\rm f}=2+1$ flavor QCD ensembles generated by the CLS consortium. These scales are determined from a tree-level improved definition of the static force on the lattice, which we measure using Wilson loops. Our analysis involves various continuum and chiral extrapolations of data that cover pion masses between 134 MeV and 420 MeV and five lattice spacings down to 0.039 fm. We compare the potential scales to gradient flow scales by forming corresponding ratios. We find $r_0=0.4757(64)$ fm at the physical point. As a byproduct of our analysis we express the $N_{\rm f}=3$ QCD Lambda parameter determined by the ALPHA Collaboration in units of the scale $r_0$ and obtain $r_0 \Lambda^{(3)}_{\overline{\rm{MS}}} = 0.820(28)$. Furthermore we present results for the second derivative of the potential to study its shape and compare it to phenomenological potential models.

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