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arxiv: 2603.09622 · v2 · pith:DQD2XX2Hnew · submitted 2026-03-10 · ✦ hep-ph · hep-ex· nucl-ex· nucl-th

JLab and J-PARC for the J/{ensuremath{psi}} Production at the Threshold

Igor I. Strakovsky (GWU) , Jung Keun Ahn (Korea U.) , William J. Briscoe (GWU) , Misha G. Ryskin (PNPI) , Axel Schmidt (GWU) This is my paper

Pith reviewed 2026-05-21 11:57 UTC · model grok-4.3

classification ✦ hep-ph hep-exnucl-exnucl-th
keywords J/ψ photoproductionthreshold productionscattering lengthnucleon form factorpentaquark statesGlueXCLAS12J-PARC
0
0 comments X

The pith

Threshold data from three JLab experiments yield a consistent J/ψ-proton scattering length

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

The paper incorporates new threshold measurements of J/ψ photoproduction from the 007 and CLAS12 experiments with prior GlueX data to extend the phenomenological extraction of the J/ψ-proton scattering length. The three data sets agree, indicating no clear systematic differences arising from the distinct experimental methodologies. Perturbative QCD calculations are found to support this phenomenological approach for heavy vector meson-nucleon scattering lengths. A correction to the extracted scattering length is computed using the pole form of the nucleon form factor, and the paper notes that upcoming J-PARC measurements with pion beams can test for possible contamination by heavy pentaquark states.

Core claim

Combining new threshold data for γp→pJ/ψ from 007 and for γ∗p→pJ/ψ from CLAS12 with existing GlueX results extends the phenomenological determination of the J/ψ-proton scattering length αJ/ψp. The agreement among all three data sets shows no indication of systematic differences between methodologies. Perturbative QCD predictions support the phenomenological determination of heavy vector meson-nucleon scattering lengths. The role of the nucleon form factor FN is discussed and a possible correction for heavy vector meson photoproduction is calculated using the pole form of FN.

What carries the argument

Phenomenological scattering-length parametrization of the near-threshold cross section, adjusted by a pole-form correction for the nucleon form factor.

If this is right

  • The J/ψ-proton scattering length extracted from photoproduction data remains consistent when new data from additional JLab setups are included.
  • Perturbative QCD calculations align with the phenomenological scattering length for heavy vector mesons.
  • The pole form of the nucleon form factor supplies a calculable correction to the extracted scattering length.
  • J-PARC pion-beam threshold data will quantify any contribution from heavy pentaquark states to low-energy J/ψ production.

Where Pith is reading between the lines

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

  • The observed consistency suggests the extracted scattering length can be used with confidence in calculations of J/ψ propagation through nuclear matter.
  • If J-PARC data confirm negligible pentaquark effects, the same threshold analysis could be applied to other vector mesons such as the Υ.
  • The form-factor correction underscores the need to include nucleon structure effects when relating photoproduction and hadroproduction cross sections near threshold.

Load-bearing premise

The threshold cross-section data can be interpreted through a simple scattering-length parametrization after a pole-form correction for the nucleon form factor, with negligible contamination from other mechanisms such as pentaquark poles.

What would settle it

A clear deviation of the measured π−p→nJ/ψ threshold cross section at J-PARC from the value predicted by the photoproduction-derived scattering length (after pole-form correction) would indicate substantial pentaquark or other contributions.

Figures

Figures reproduced from arXiv: 2603.09622 by Axel Schmidt (GWU), Igor I. Strakovsky (GWU), Jung Keun Ahn (Korea U.), Misha G. Ryskin (PNPI), William J. Briscoe (GWU).

Figure 1
Figure 1. Figure 1: FIG. 1. The total [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 3
Figure 3. Figure 3: as a function of the inverse vector-meson mass, 1/mV . Starting from the ϕ-meson and for higher masses, the SLs are significantly smaller than the typical hadron size of about 1 fm, indicating an increasing transparency of the proton for these mesons. Moreover, our analysis shows an almost linear (on an exponential scale) increase in |αV p| ∝ exp(1/mV ) , (5) with increasing 1/mV . This is an interesting o… view at source ↗
read the original abstract

New threshold measurements for $\gamma~p\to p~J/\psi \to p~(\mu^+\mu^-)$ by 007 and $\gamma^\ast~p\to p~J/\psi \to p~(e^+e^-)$ by CLAS12 allow us to extend the previous phenomenological determination of the J/\ensuremath{\psi}-proton scattering length, $\alpha_{J/\psi p}$, using GlueX threshold data for $\gamma~p\to p~J/\psi \to p~(e^+e^-)$. The agreement between all three J/\ensuremath{\psi} data sets shows no indication of systematic differences between methodologies. Furthermore, perturbative QCD predictions support the phenomenological determination of heavy vector meson-nucleon scattering lengths. The role of the nucleon form factor, $F_N$, is discussed, and a possible correction to the phenomenological scattering length for heavy vector meson photoproduction is calculated using the pole form of $F_N$. Upcoming J-PARC threshold measurements of the reaction $\pi^-~p\to n~J/\psi \to n~(l^+l^-)$ will help to evaluate the possible role of heavy pentaquark, $P_c$, states in low-energy $J/\psi$ production and the effects caused by the nucleon form factors.

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.

Referee Report

2 major / 3 minor

Summary. The paper extends a phenomenological extraction of the J/ψ-proton scattering length α_{J/ψ p} by incorporating new near-threshold data from the 007 experiment (γ p → p J/ψ → p (μ⁺μ⁻)) and CLAS12 (γ* p → p J/ψ → p (e⁺e⁻)) alongside prior GlueX results. It reports consistency across the three datasets with no evident systematic differences, applies a pole-form correction for the nucleon form factor F_N, notes support from perturbative QCD, and defers quantitative assessment of possible P_c pentaquark contamination to upcoming J-PARC π⁻ p → n J/ψ measurements.

Significance. If the extraction procedure is robust, the work supplies a data-driven value for the scattering length of a heavy vector meson with the nucleon, which is relevant for threshold production modeling and for testing the applicability of pQCD to heavy-meson–nucleon interactions. The reported cross-experiment agreement between photoproduction and electroproduction datasets, together with the explicit form-factor correction, constitutes a concrete advance over single-experiment analyses.

major comments (2)
  1. [Phenomenological extraction and abstract] Phenomenological extraction (abstract and main text): the manuscript states that the three datasets are consistent but provides no explicit parametrization of the threshold cross section (e.g., the functional form combining α_{J/ψ p} with the pole-form F_N correction), no data-selection cuts, and no description of the fitting procedure or uncertainty propagation. Without these details the claim of “no indication of systematic differences” cannot be verified and is load-bearing for the central result.
  2. [Discussion of upcoming J-PARC measurements] Discussion of P_c states and J-PARC (final paragraph): the extraction assumes negligible pentaquark-pole contamination in the current GlueX, 007, and CLAS12 data after the F_N correction. No quantitative bound or sensitivity study is given for the existing datasets; if such contributions are appreciable they would bias α_{J/ψ p}, directly affecting the reported value and the pQCD comparison.
minor comments (3)
  1. [Form-factor discussion] Define the pole form of F_N explicitly as an equation and state the numerical value adopted for the cutoff parameter.
  2. [Introduction and pQCD paragraph] Add a reference to the original GlueX scattering-length extraction and to any prior pQCD calculations of vector-meson–nucleon scattering lengths for direct comparison.
  3. Ensure consistent notation for the scattering length (α_{J/ψ p} versus α_{J/ψp}) throughout the text and figures.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and the constructive comments. We address each major comment below and have revised the manuscript to improve clarity and completeness.

read point-by-point responses

  1. Referee: Phenomenological extraction (abstract and main text): the manuscript states that the three datasets are consistent but provides no explicit parametrization of the threshold cross section (e.g., the functional form combining α_{J/ψ p} with the pole-form F_N correction), no data-selection cuts, and no description of the fitting procedure or uncertainty propagation. Without these details the claim of “no indication of systematic differences” cannot be verified and is load-bearing for the central result.

    Authors: We agree that explicit details on the extraction are required for verification. The revised manuscript now includes a new subsection that specifies the parametrization of the near-threshold cross section, combining the scattering length α_{J/ψ p} with the pole-form nucleon form factor correction F_N. Data-selection criteria for the GlueX, 007, and CLAS12 datasets are stated explicitly, and the fitting procedure together with the uncertainty propagation method is described. These additions allow direct assessment of the reported consistency across experiments. revision: yes

  2. Referee: Discussion of P_c states and J-PARC (final paragraph): the extraction assumes negligible pentaquark-pole contamination in the current GlueX, 007, and CLAS12 data after the F_N correction. No quantitative bound or sensitivity study is given for the existing datasets; if such contributions are appreciable they would bias α_{J/ψ p}, directly affecting the reported value and the pQCD comparison.

    Authors: The assumption of negligible P_c contamination rests on the absence of resonant structures in the present data after the form-factor correction. A quantitative sensitivity study for the existing datasets is not feasible without additional model assumptions that lie outside the scope of this work. The revised final paragraph now states this limitation explicitly and reiterates that the forthcoming J-PARC measurements are intended to furnish the data needed for such an assessment, thereby addressing the potential bias concern. revision: partial

Circularity Check

0 steps flagged

No significant circularity; extraction and cross-checks are independent

full rationale

The paper extends a prior phenomenological fit for the J/ψ-proton scattering length using new threshold data from independent experiments (GlueX, 007, CLAS12) and compares the result to external perturbative QCD calculations. The nucleon form-factor correction is computed separately via the pole form, and possible pentaquark contributions are explicitly deferred to future J-PARC measurements rather than assumed negligible in a load-bearing step. No quoted equation or claim reduces the central result to its own fitted inputs by construction, and self-citations (if present) are not required to justify uniqueness or forbid alternatives. The derivation chain therefore remains self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 1 invented entities

The central claim rests on a phenomenological fit of the scattering length to threshold cross sections, an assumption that form-factor effects can be isolated with a pole parametrization, and the expectation that pQCD supplies an independent check.

free parameters (1)
  • J/ψ-proton scattering length α_{J/ψ p}
    Phenomenologically fitted to combined threshold photoproduction data from GlueX, 007, and CLAS12.
axioms (2)
  • domain assumption Threshold behavior of J/ψ photoproduction is dominated by the s-wave scattering length after form-factor correction
    Implicit in the extraction method described in the abstract.
  • domain assumption Perturbative QCD predictions apply to heavy vector-meson nucleon scattering lengths
    Invoked to support the phenomenological result.
invented entities (1)
  • Heavy pentaquark Pc states no independent evidence
    purpose: Possible additional contribution to low-energy J/ψ production
    Mentioned as a mechanism whose role will be tested by upcoming J-PARC data; no independent evidence supplied in the abstract.

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Reference graph

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