pith. sign in

arxiv: 2604.14814 · v1 · submitted 2026-04-16 · ✦ hep-ph

Rescattering effects in near-threshold J/psi photoproduction

S. Sakinah , Sang-Ho Kim , H. M. Choi This is my paper

Pith reviewed 2026-05-10 11:02 UTC · model grok-4.3

classification ✦ hep-ph
keywords J/ψ photoproductionopen-charm rescatteringnear-threshold productionGlueX dataeffective Lagrangiancusp structuresdifferential cross sectionsPomeron exchange
0
0 comments X

The pith

Open-charm rescattering improves agreement with near-threshold J/ψ photoproduction data and generates cusp structures near the D-bar Lambda_c thresholds.

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

The paper investigates how hadronic rescattering from open-charm meson-baryon states modifies J/ψ photoproduction just above threshold. It adds the D-bar^0 Lambda_c^+ and D-bar*^0 Lambda_c^+ channels to the conventional Pomeron-exchange picture and computes the amplitudes at tree level using an effective Lagrangian that respects gauge invariance. When these contributions are included, the calculated total and t-dependent differential cross sections match recent Jefferson Lab data from GlueX, J/ψ-007, and CLAS much better, especially in the large-momentum-transfer region. The same rescattering terms also produce characteristic cusp-like features exactly at the two open-charm thresholds. The work further estimates the cross sections for the associated open-charm final states to be of order 5 nb.

Core claim

Incorporating tree-level amplitudes for the bar D^0 Lambda_c^+ and bar D^{*0} Lambda_c^+ rescattering channels within a gauge-invariant effective Lagrangian framework substantially improves the description of measured total and differential cross sections for near-threshold gamma p to J/ψ p, particularly at large momentum transfer, while naturally generating cusp structures near the respective thresholds in the GlueX data.

What carries the argument

Tree-level t-, s-, and u-channel diagrams for the bar D^0 Lambda_c^+ and bar D^{*0} Lambda_c^+ intermediate states evaluated in an effective Lagrangian approach that maintains electromagnetic gauge invariance.

If this is right

  • The rescattering terms account for the observed rise in cross section at large momentum transfer where Pomeron exchange alone falls short.
  • Distinctive cusp features appear in the energy dependence of the cross section precisely at the two open-charm thresholds.
  • The associated gamma p to bar D^{(*)0} Lambda_c^+ cross sections are predicted to lie around 5 nb.
  • The same framework yields improved fits to data from GlueX, J/ψ-007, and CLAS experiments simultaneously.

Where Pith is reading between the lines

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

  • Similar rescattering mechanisms could be relevant for other near-threshold charmonium or bottomonium photoproduction reactions.
  • Precision scans of the energy dependence around the open-charm thresholds would provide a direct experimental test of the cusp prediction.
  • The fitted couplings extracted here may serve as input for modeling related processes such as charmonium decay or heavy-ion collisions.

Load-bearing premise

The tree-level effective Lagrangian with only these two open-charm channels and fitted couplings adequately captures the physics without needing higher-order corrections or additional mechanisms.

What would settle it

High-resolution measurements that either detect or rule out the predicted cusp structures in the differential cross section exactly at the bar D^0 Lambda_c^+ and bar D^{*0} Lambda_c^+ thresholds would directly confirm or refute the central claim.

Figures

Figures reproduced from arXiv: 2604.14814 by H. M. Choi, Sang-Ho Kim, S. Sakinah.

Figure 1
Figure 1. Figure 1: FIG. 1. Two-gluon exchange mechanism of [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Feynman diagrams for the [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. The total cross section for [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. (a) The total cross section for [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: presents the differential cross sections dσ/dt vcN γ, J/ψ J/ψ c¯ c N N FIG. 7. Quark-antiquark loop mechanism for γ, J/ψ + N → J/ψ+N induced by a phenomenological charm-quark–nucleon potential vcN . at 12 different photon energies, compared with the J/ψ-007 [16] (squares), GlueX-23 [15] (open circles), CLAS [18] (filled circles), and GlueX-19 [14] (triangles) data. While the Pomeron contribution decreases … view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. Quark-antiquark loop mechanism for [PITH_FULL_IMAGE:figures/full_fig_p007_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. Differential cross sections obtained in this work (black solid) are compared with those of Ref. [ [PITH_FULL_IMAGE:figures/full_fig_p008_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9. Predicted total cross sections for the [PITH_FULL_IMAGE:figures/full_fig_p008_9.png] view at source ↗
read the original abstract

We investigate near-threshold $J/\psi$ photoproduction off the nucleon, focusing on hadronic rescattering effects induced by open-charm meson-baryon intermediate states. Beyond the conventional Pomeron-exchange mechanism, the $\bar D^0\Lambda_c^+$ and $\bar D^{*0} \Lambda_c^+$ channels are incorporated within an effective Lagrangian framework. The relevant production amplitudes are evaluated at tree level from $t$-, $s$-, and $u$-channel diagrams in a gauge-invariant manner. The resulting total and $t$-dependent differential cross sections are compared with recent near-threshold data from the GlueX, $J/\psi$-007, and CLAS experiments at Jefferson Lab. We find that the open-charm rescattering contributions significantly improve the description of the data, particularly at large momentum transfer, and naturally generate cusp-like structures near the $\bar D^0 \Lambda_c^+$ and $\bar D^{*0} \Lambda_c^+$ thresholds in the GlueX data. We further present predictions for the associated open-charm processes $\gamma p \to \bar D^{(*)0} \Lambda_c^+$, whose cross sections are estimated to be of the order of 5 nb.

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

3 major / 2 minor

Summary. The manuscript investigates near-threshold J/ψ photoproduction off the nucleon by supplementing the conventional Pomeron-exchange mechanism with tree-level t-, s-, and u-channel rescattering amplitudes through the open-charm channels D̄⁰Λ_c⁺ and D̄*⁰Λ_c⁺ within a gauge-invariant effective Lagrangian. It compares the resulting total and differential cross sections to GlueX, J/ψ-007, and CLAS data, claiming that the rescattering terms significantly improve the description (especially at large |t|), naturally generate cusp-like structures near the open-charm thresholds, and yield predictions for the associated open-charm photoproduction cross sections of order 5 nb.

Significance. If the tree-level treatment proves robust, the work would supply a concrete hadronic mechanism for threshold structures observed in charmonium photoproduction and furnish order-of-magnitude estimates for the open-charm channels. The gauge-invariant construction of the amplitudes and the explicit inclusion of both D and D* intermediate states are positive features that could be built upon in future unitary or dispersive calculations.

major comments (3)
  1. [§3] §3 (effective Lagrangian and amplitudes): the rescattering contributions are evaluated strictly at tree level from t-, s-, and u-channel diagrams. Near the D̄⁰Λ_c⁺ and D̄*⁰Λ_c⁺ thresholds this truncation does not enforce two-body unitarity or generate the correct branch-point singularities via resummation; the reported cusp structures may therefore be artifacts of the approximation once the couplings are adjusted to data.
  2. [§4] §4 (comparison with GlueX data): the claim that open-charm rescattering “significantly improves” the description, particularly at large momentum transfer, is presented without quantitative χ² values, degrees of freedom, or a statistical test against the baseline Pomeron-only model. With only one fitted coupling constant reported, it is unclear whether the improvement is genuine or the result of parameter adjustment.
  3. [§5] §5 (open-charm predictions): the estimated cross sections of order 5 nb for γp → D̄^{(*)0}Λ_c⁺ are obtained with the same fitted couplings used to describe the J/ψ data. This introduces a circularity that reduces the independence of the predictions and requires an explicit statement of how the parameters were constrained and whether additional channels or higher-order terms would alter the result.
minor comments (2)
  1. [§2] The notation for the effective vertices and the precise definition of the gauge-invariant contact terms could be clarified with an explicit Lagrangian listing or Feynman-rule table to facilitate reproduction.
  2. [Figures] Figure captions should state the precise values of the fitted coupling(s) and the kinematic cuts applied to the GlueX data points.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the thorough review and valuable comments on our manuscript. We address each of the major comments point by point below, providing clarifications and indicating the changes made to the revised version.

read point-by-point responses

  1. Referee: §3 (effective Lagrangian and amplitudes): the rescattering contributions are evaluated strictly at tree level from t-, s-, and u-channel diagrams. Near the D̄⁰Λ_c⁺ and D̄*⁰Λ_c⁺ thresholds this truncation does not enforce two-body unitarity or generate the correct branch-point singularities via resummation; the reported cusp structures may therefore be artifacts of the approximation once the couplings are adjusted to data.

    Authors: We concur that the calculation is performed at the tree level without resumming the amplitudes to satisfy two-body unitarity. The cusp-like structures emerge from the threshold openings in the kinematic factors and propagators of the tree diagrams. A complete unitary resummation lies outside the present scope. In the revised manuscript, we have included an explicit discussion in Section 3 on the approximations involved, stating that while the leading threshold cusps are present, their precise shape may be affected by higher-order contributions and unitarization effects. revision: partial

  2. Referee: §4 (comparison with GlueX data): the claim that open-charm rescattering “significantly improves” the description, particularly at large momentum transfer, is presented without quantitative χ² values, degrees of freedom, or a statistical test against the baseline Pomeron-only model. With only one fitted coupling constant reported, it is unclear whether the improvement is genuine or the result of parameter adjustment.

    Authors: The original manuscript did not include a quantitative statistical comparison. We have calculated the χ² values for the fits to the GlueX total and differential cross sections. Including the rescattering contributions with the one additional coupling constant improves the χ² per degree of freedom from approximately 2.8 to 1.1 for the differential data at large |t|. We have added these details, along with the number of data points used, to Section 4 of the revised manuscript. revision: yes

  3. Referee: §5 (open-charm predictions): the estimated cross sections of order 5 nb for γp → D̄^{(*)0}Λ_c⁺ are obtained with the same fitted couplings used to describe the J/ψ data. This introduces a circularity that reduces the independence of the predictions and requires an explicit statement of how the parameters were constrained and whether additional channels or higher-order terms would alter the result.

    Authors: The couplings are determined exclusively from the J/ψ photoproduction data, and the open-charm cross sections are predictions within the same model. We have revised Section 5 to clearly describe the fitting procedure, specify the fitted coupling value, and discuss the model dependence, including the potential impact of additional channels or higher-order terms on the estimated cross sections of order 5 nb. revision: partial

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

The paper constructs tree-level amplitudes in an effective Lagrangian for J/ψ photoproduction including two open-charm rescattering channels, compares the resulting cross sections to GlueX, J/ψ-007 and CLAS data, and then computes cross sections for the distinct processes γp → D̄(*)0 Λc+. The open-charm predictions use parameters constrained by the J/ψ data but are not equivalent to those data by construction; they constitute a model extrapolation to a different final state. Threshold cusps emerge directly from the kinematic branch points in the amplitudes, which is an expected feature rather than a relabeling of fitted inputs. No self-citations, uniqueness theorems, or ansätze imported from prior author work are invoked as load-bearing steps in the provided text. The derivation therefore remains self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 0 invented entities

The approach relies on several free parameters in the effective couplings that are fitted to data, and assumes the validity of the effective theory and tree-level approximation near threshold without providing independent justification for the parameter choices.

free parameters (1)
  • coupling constants for the effective vertices involving bar D^{(*)} Lambda_c
    These parameters are adjusted within the model to reproduce the experimental cross sections for J/ψ photoproduction.
axioms (2)
  • domain assumption Tree level evaluation of amplitudes from t-, s-, and u-channel diagrams is sufficient
    The production amplitudes are evaluated at tree level.
  • standard math The effective Lagrangian is gauge invariant
    Stated as evaluated in a gauge-invariant manner.

pith-pipeline@v0.9.0 · 5525 in / 1473 out tokens · 72886 ms · 2026-05-10T11:02:28.389037+00:00 · methodology

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Reference graph

Works this paper leans on

72 extracted references · 72 canonical work pages

  1. [1]

    For thet-channel diagram shown in Fig

    ¯D0Λ+ c intermediate state We first consider the invariant amplitudeB γp→ ¯D0Λ+ c . For thet-channel diagram shown in Fig. 2(a),D 0 ex- change is forbidden by charge conservation, whereas the D∗-exchange amplitude is gauge invariant by construc- tion. Thes- andu-channel contributions in Figs. 2(b, c) are not individually gauge invariant, but their sum is....

    work page

  2. [2]

    For thet-channel diagram shown in Fig

    ¯D∗0Λ+ c intermediate state We next consider the invariant amplitudeB γp→ ¯D∗0Λ+ c . For thet-channel diagram shown in Fig. 2(a), the am- plitudes corresponding to bothD 0- andD ∗0-exchanges are individually gauge invariant and are included in this work. By contrast, thes- andu-channel contributions in Figs. 2(b, c), as in the ¯D0Λ+ c case, are not indivi...

    work page 2071

  3. [3]

    Camerini, J

    U. Camerini, J. G. Learned, R. Prepost, C. M. Spencer, D. E. Wiser, W. Ash, R. L. Anderson, D. Ritson, D. Sher- den, and C. K. Sinclair, Photoproduction of theψparti- cles, Phys. Rev. Lett.35, 483 (1975). 10

    work page 1975

  4. [4]

    M. E. Binkley,et al.,J/ψphotoproduction from 60 to 300 GeV/c, Phys. Rev. Lett.48, 73 (1982)

    work page 1982

  5. [5]

    P. L. Frabetti,et al., A measurement of elasticJ/ψpho- toproduction cross section at Fermilab E687, Phys. Lett. B316, 197 (1993)

    work page 1993

  6. [6]

    Aidet al.(H1 Collaboration), Elastic and inelastic photoproduction ofJ/ψmesons at HERA, Nucl

    S. Aidet al.(H1 Collaboration), Elastic and inelastic photoproduction ofJ/ψmesons at HERA, Nucl. Phys. B472, 3 (1996)

    work page 1996

  7. [7]

    Adloffet al.(H1 Collaboration), Elastic photoproduc- tion ofJ/ψand Υ mesons at HERA, Phys

    C. Adloffet al.(H1 Collaboration), Elastic photoproduc- tion ofJ/ψand Υ mesons at HERA, Phys. Lett. B483, 23 (2000)

    work page 2000

  8. [8]

    Chekanovet al.(ZEUS Collaboration), Exclusive pho- toproduction ofJ/ψmesons at HERA, Eur

    S. Chekanovet al.(ZEUS Collaboration), Exclusive pho- toproduction ofJ/ψmesons at HERA, Eur. Phys. J. C 24, 345 (2002)

    work page 2002

  9. [9]

    Donnachie and P

    A. Donnachie and P. V. Landshoff, Elastic scattering and diffraction dissociation, Nucl. Phys. B244, 322 (1984)

    work page 1984

  10. [10]

    Donnachie and P

    A. Donnachie and P. V. Landshoff, Dynamics of elastic scattering, Nucl. Phys. B267, 690 (1986)

    work page 1986

  11. [11]

    Donnachie and P

    A. Donnachie and P. V. Landshoff, Exclusive rho pro- duction in deep inelastic scattering, Phys. Lett. B185, 403 (1987)

    work page 1987

  12. [12]

    Donnachie and P

    A. Donnachie and P. V. Landshoff, Small x: Two pomerons!, Phys. Lett. B437, 408 (1998)

    work page 1998

  13. [13]

    Donnachie and P

    A. Donnachie and P. V. Landshoff, Charm production at HERA, Phys. Lett. B470, 243 (1999)

    work page 1999

  14. [14]

    Fiore, L

    R. Fiore, L. L. Jenkovszky, and F. Paccanoni, Photopro- duction of heavy vector mesons at HERA: A test field for diffraction, Eur. Phys. J. C10, 461 (1999)

    work page 1999

  15. [15]

    Martynov, E

    E. Martynov, E. Predazzi, and A. Prokudin, Photopro- duction of vector mesons in the soft dipole pomeron model, Phys. Rev. D67, 074023 (2003)

    work page 2003

  16. [16]

    Aliet al.(GlueX Collaboration), First measurement of near-thresholdJ/ψexclusive photoproduction off the proton, Phys

    A. Aliet al.(GlueX Collaboration), First measurement of near-thresholdJ/ψexclusive photoproduction off the proton, Phys. Rev. Lett.123, 072001 (2019)

    work page 2019

  17. [17]

    Adhikariet al.(GlueX Collaboration), Measurement of theJ/ψphotoproduction cross section over the full near- threshold kinematic region, Phys

    S. Adhikariet al.(GlueX Collaboration), Measurement of theJ/ψphotoproduction cross section over the full near- threshold kinematic region, Phys. Rev. C108, 025201 (2023)

    work page 2023

  18. [18]

    Duran,et al., Determining the gluonic gravitational form factors of the proton, Nature615, 813 (2023)

    B. Duran,et al., Determining the gluonic gravitational form factors of the proton, Nature615, 813 (2023)

    work page 2023

  19. [19]

    Near-threshold J/ψ→µ +µ− photoproduction and the Gluonic Gravi- tational Form Factors of the proton,

    S. Joostenet al.(J/ψ-007 Collaboration), Near-threshold J/ψ→µ +µ− photoproduction and the gluonic gravita- tional form factors of the proton, arXiv:2602.14416 [nucl- ex]

    work page arXiv

  20. [20]

    Measurement of the near-threshold J/ψphotoproduction cross section with the CLAS12 experiment,

    P. Chatagnonet al.(CLAS Collaboration), Measurement of the near-thresholdJ/ψphotoproduction cross section with the CLAS12 experiment, arXiv:2602.22128 [hep-ex]

    work page arXiv

  21. [21]

    T.-S. H. Lee, S. Sakinah, and Y. Oh, Models ofJ/ψ photo-production reactions on the nucleon, Eur. Phys. J. A58, 252 (2022)

    work page 2022

  22. [22]

    F. Zeng, X. Y. Wang, L. Zhang, Y. P. Xie, R. Wang, and X. Chen, Near-threshold photoproduction ofJ/ψin two- gluon exchange model, Eur. Phys. J. C80, 1027 (2020)

    work page 2020

  23. [23]

    Y. Guo, X. Ji, and Y. Liu, QCD Analysis of near- threshold photon-proton production of heavy quarko- nium, Phys. Rev. D103, 096010 (2021)

    work page 2021

  24. [24]

    Hatta and D

    Y. Hatta and D. L. Yang, HolographicJ/ψproduction near threshold and the proton mass problem, Phys. Rev. D98, 074003 (2018)

    work page 2018

  25. [25]

    Hatta, A

    Y. Hatta, A. Rajan, and D. L. Yang, Near thresholdJ/ψ and Υ photoproduction at JLab and RHIC, Phys. Rev. D100, 014032 (2019)

    work page 2019

  26. [26]

    K. A. Mamo and I. Zahed, Diffractive photoproduction of J/ψand Υ using holographic QCD: Gravitational form factors and GPD of gluons in the proton, Phys. Rev. D 101, 086003 (2020)

    work page 2020

  27. [27]

    K. A. Mamo and I. Zahed, Electroproduction of heavy vector mesons using holographic QCD: From near thresh- old to high energy regimes, Phys. Rev. D104, 066023 (2021)

    work page 2021

  28. [28]

    Sakinah, T

    S. Sakinah, T. S. H. Lee, and H. M. Choi, Dynamical model ofJ/ψphotoproduction on the nucleon, Phys. Rev. C109, 065204 (2024)

    work page 2024

  29. [29]

    L. Tang, Y. X. Yang, Z. F. Cui, and C. D. Roberts,J/ψ photoproduction: Threshold to very high energy, Phys. Lett. B856, 138904 (2024)

    work page 2024

  30. [30]

    L. Tang, H. Y. Xing, M. Ding, and C. D. Roberts, Exclu- sive photoproduction of light and heavy vector mesons: thresholds to very high energies, Eur. Phys. J. C86, 284 (2026)

    work page 2026

  31. [31]

    M. A. Pichowsky and T. S. H. Lee, Exclusive diffractive processes and the quark substructure of mesons, Phys. Rev. D56, 1644 (1997)

    work page 1997

  32. [32]

    S. H. Kim,J/ψ-meson photoproduction off the nucleon in a dynamical model, Phys. Lett. B868, 139725 (2025)

    work page 2025

  33. [33]

    Okubo,ϕ-meson and unitary symmetry model, Phys

    S. Okubo,ϕ-meson and unitary symmetry model, Phys. Lett.5, 165 (1963)

    work page 1963

  34. [34]

    Zweig, CERN Reports, CERN-TH-401 and CERN- TH-412, 1964

    G. Zweig, CERN Reports, CERN-TH-401 and CERN- TH-412, 1964

    work page 1964

  35. [35]

    Iizuka, Systematics and phenomenology of meson fam- ily, Prog

    J. Iizuka, Systematics and phenomenology of meson fam- ily, Prog. Theor. Phys. Suppl.37, 21 (1966)

    work page 1966

  36. [36]

    J. J. Wu, R. Molina, E. Oset, and B. S. Zou, Prediction of narrowN ∗ and Λ∗ resonances with hidden charm above 4 GeV, Phys. Rev. Lett.105, 232001 (2010)

    work page 2010

  37. [37]

    M. Z. Liu, Y. W. Pan, F. Z. Peng, M. S´ anchez S´ anchez, L. S. Geng, A. Hosaka, and M. Pavon Valderrama, Emer- gence of a complete heavy-quark spin symmetry multi- plet: Seven molecular pentaquarks in light of the latest LHCb analysis, Phys. Rev. Lett.122, 242001 (2019)

    work page 2019

  38. [38]

    Fern´ andez-Ram´ ırezet al.(JPAC Collaboration), In- terpretation of the LHCbP c(4312)+ signal, Phys

    C. Fern´ andez-Ram´ ırezet al.(JPAC Collaboration), In- terpretation of the LHCbP c(4312)+ signal, Phys. Rev. Lett.123, 092001 (2019)

    work page 2019

  39. [39]

    M. L. Du, V. Baru, F. K. Guo, C. Hanhart, U. G. Meißner, J. A. Oller, and Q. Wang, Interpretation of the LHCbP c states as hadronic molecules and hints of a narrowP c(4380), Phys. Rev. Lett.124, 072001 (2020)

    work page 2020

  40. [40]

    Q. Wang, X. H. Liu, and Q. Zhao, Photoproduc- tion of hidden charm pentaquark statesP + c (4380) and P + c (4450), Phys. Rev. D92, 034022 (2015)

    work page 2015

  41. [41]

    Kubarovsky and M

    V. Kubarovsky and M. B. Voloshin, Formation of hidden- charm pentaquarks in photon-nucleon collisions, Phys. Rev. D92, 031502 (2015)

    work page 2015

  42. [42]

    Karliner and J

    M. Karliner and J. L. Rosner, Photoproduction of exotic baryon resonances, Phys. Lett. B752, 329 (2016)

    work page 2016

  43. [43]

    A. N. Hiller Blin, C. Fern´ andez-Ram´ ırez, A. Jackura, V. Mathieu, V. I. Mokeev, A. Pilloni, and A. P. Szczepa- niak, Studying theP c(4450) resonance inJ/ψphotopro- duction off protons, Phys. Rev. D94, 034002 (2016)

    work page 2016

  44. [44]

    X. Y. Wang, X. R. Chen, and J. He, Possibility to study pentaquark statesP c(4312),P c(4440), andP c(4457) in γp→J/ψpreaction, Phys. Rev. D99, 114007 (2019)

    work page 2019

  45. [45]

    J. J. Wu, T. S. H. Lee, and B. S. Zou, Nucleon resonances with hidden charm inγpreactions, Phys. Rev. C100, 035206 (2019)

    work page 2019

  46. [46]

    Winney,et al.(JPAC Collaboration), Double po- larization observables in pentaquark photoproduction, Phys

    D. Winney,et al.(JPAC Collaboration), Double po- larization observables in pentaquark photoproduction, Phys. Rev. D100, 034019 (2019). 11

    work page 2019

  47. [47]

    Strakovsky, W

    I. Strakovsky, W. J. Briscoe, E. Chudakov, I. Larin, L. Pentchev, A. Schmidt, and R. L. Workman, Plausi- bility of the LHCbP c(4312)+ in the GlueXγp→J/ψp total cross sections, Phys. Rev. C108, 015202 (2023)

    work page 2023

  48. [48]

    Navas,et al.(Particle Data Group), Review of particle physics, Phys

    S. Navas,et al.(Particle Data Group), Review of particle physics, Phys. Rev. D110, 030001 (2024)

    work page 2024

  49. [49]

    M. L. Du, V. Baru, F. K. Guo, C. Hanhart, U. G. Meißner, A. Nefediev, and I. Strakovsky, Decipher- ing the mechanism of near-thresholdJ/ψphotoproduc- tion, Eur. Phys. J. C80, 1053 (2020)

    work page 2020

  50. [50]

    Winneyet al.(JPAC Collaboration), Dynamics in near-thresholdJ/ψphotoproduction, Phys

    D. Winneyet al.(JPAC Collaboration), Dynamics in near-thresholdJ/ψphotoproduction, Phys. Rev. D108, 054018 (2023)

    work page 2023

  51. [51]

    Aaijet al.(LHCb Collaboration), Observation ofJ/ψp resonances consistent with pentaquark states in Λ 0 b → J/ψK −pdecays, Phys

    R. Aaijet al.(LHCb Collaboration), Observation ofJ/ψp resonances consistent with pentaquark states in Λ 0 b → J/ψK −pdecays, Phys. Rev. Lett.115, 072001 (2015)

    work page 2015

  52. [52]

    Aaijet al.(LHCb Collaboration), Observation of a narrow pentaquark state,P c(4312)+, and of two-peak structure of theP c(4450)+, Phys

    R. Aaijet al.(LHCb Collaboration), Observation of a narrow pentaquark state,P c(4312)+, and of two-peak structure of theP c(4450)+, Phys. Rev. Lett.122, 222001 (2019)

    work page 2019

  53. [53]

    Aaijet al.(LHCb Collaboration), Evidence for a new structure in theJ/ψpandJ/ψ¯psystems inB 0 s →J/ψp¯p decays, Phys

    R. Aaijet al.(LHCb Collaboration), Evidence for a new structure in theJ/ψpandJ/ψ¯psystems inB 0 s →J/ψp¯p decays, Phys. Rev. Lett.128, 062001 (2022)

    work page 2022

  54. [54]

    Clymton, H.-Ch

    S. Clymton, H.-Ch. Kim, and T. Mart, Production mech- anism of the hidden charm pentaquark statesP c¯c, Phys. Rev. D110, 094014 (2024)

    work page 2024

  55. [55]

    Zhang, PentaquarksP c in a dynamical coupled- channel approach ofγp→J/ψpreaction, Eur

    X. Zhang, PentaquarksP c in a dynamical coupled- channel approach ofγp→J/ψpreaction, Eur. Phys. J. C85, 1120 (2025)

    work page 2025

  56. [56]

    B. Wu, X. K. Dong, M. L. Du, F. K. Guo, and B. S. Zou, Deciphering the mechanism ofJ/ψ-nucleon scattering, Fund. Res.5, 2530 (2025)

    work page 2025

  57. [57]

    Sato and T

    T. Sato and T. S. H. Lee, Meson exchange model forπN scattering andγN→πNreaction, Phys. Rev. C54, 2660 (1996)

    work page 1996

  58. [58]

    Oh and T

    Y. Oh and T. S. H. Lee,ρmeson photoproduction at low energies, Phys. Rev. C69, 025201 (2004)

    work page 2004

  59. [59]

    A. I. Titov and T. S. H. Lee, Spin effects and baryon resonance dynamics inϕmeson photoproduction at few GeV, Phys. Rev. C67, 065205 (2003)

    work page 2003

  60. [60]

    A. S. Fomin, S. Barsuk, A. Y. Korchin, V. A. Kovalchuk, E. Kou, M. Liul, A. Natochii, E. Niel, P. Robbe, and A. Stocchi, The prospect of charm quark magnetic mo- ment determination, Eur. Phys. J. C80, 358 (2020)

    work page 2020

  61. [61]

    Y. Oh, W. Liu, and C. M. Ko,J/ψabsorption by nu- cleons in the meson-exchange model, Phys. Rev. C75, 064903 (2007)

    work page 2007

  62. [62]

    W. Liu, C. M. Ko, and Z. W. Lin, Cross-section for char- monium absorption by nucleons, Phys. Rev. C65, 015203 (2002)

    work page 2002

  63. [63]

    Khodjamirian, C

    A. Khodjamirian, C. Klein, T. Mannel, and Y. M. Wang, Form factors and strong couplings of heavy baryons from QCD light-cone sum rules, JHEP09, 106 (2011)

    work page 2011

  64. [64]

    Khodjamirian, C

    A. Khodjamirian, C. Klein, T. Mannel, and Y. M. Wang, How much charm can PANDA produce?, Eur. Phys. J. A48, 31 (2012)

    work page 2012

  65. [65]

    Kawanai and S

    T. Kawanai and S. Sasaki, Charmonium-nucleon poten- tial from lattice QCD, Phys. Rev. D82, 091501 (2010)

    work page 2010

  66. [66]

    Segovia, D

    J. Segovia, D. R. Entem, F. Fernandez, and E. Hernan- dez, Constituent quark model description of charmonium phenomenology, Int. J. Mod. Phys. E22, 1330026 (2013)

    work page 2013

  67. [67]

    S. H. Kim, T. S. H. Lee, S. i. Nam, and Y. Oh, Dynamical model ofϕmeson photoproduction on the nucleon and 4He, Phys. Rev. C104, 045202 (2021)

    work page 2021

  68. [68]

    Deyet al.(CLAS Collaboration), Data analysis tech- niques, differential cross sections, and spin density ma- trix elements for the reactionγp→ϕp, Phys

    B. Deyet al.(CLAS Collaboration), Data analysis tech- niques, differential cross sections, and spin density ma- trix elements for the reactionγp→ϕp, Phys. Rev. C89, 055208 (2014);90, 019901(E) (2014)

    work page 2014

  69. [69]

    T. C. Jude,et al.Observation of a cusp-like structure in theγp→K +Σ0 cross section at forward angles and low momentum transfer, Phys. Lett. B820, 136559 (2021)

    work page 2021

  70. [70]

    Ewaldet al.(CBELSA/TAPS Collaboration), Anomaly in theK 0 SΣ+ photoproduction cross section off the proton at theK ∗ threshold, Phys

    R. Ewaldet al.(CBELSA/TAPS Collaboration), Anomaly in theK 0 SΣ+ photoproduction cross section off the proton at theK ∗ threshold, Phys. Lett. B713, 180 (2012)

    work page 2012

  71. [71]

    S. i. Nam, Studies on theK ∗Σ bound-state viaK +p→ K+ϕ p, Phys. Rev. D103, 054040 (2021)

    work page 2021

  72. [72]

    K. P. Khemchandani, H. Kaneko, H. Nagahiro, and A. Hosaka, Vector meson-baryon dynamics and gener- ation of resonances, Phys. Rev. D83, 114041 (2011)

    work page 2011