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REVIEW 2 major objections 3 minor 28 references

Inclusive photoproduction of vector quarkonium in ultra-peripheral collisions at the LHC

T0 review · 2 major / 3 minor · reviewed 2026-08-10 · deepseek-v4-flash

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Pith's one-line read Inclusive J/psi photoproduction in proton-lead collisions at the LHC can be isolated from the hadronic background and measured up to transverse momentum of 20 GeV.

desk verdict A clear proceedings summary of a plausible CMS projection, but the 100% photoproduction-in-peripheral-centrality assumption is unquantified and load-bearing. read the letter →

arxiv 2501.12182 v1 pith:MTVUKNRG submitted 2025-01-21 hep-ph

Kate Lynch This is my paper · ORCID
classification hep-ph
keywords inclusivequarkoniumphotoproductionultra-peripheralcollisionsJ/psiproductionproton-leadCMSrapiditygapscentralityselectionNRQCD
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 argues that inclusive photoproduction of J/psi mesons—a process for which HERA data are statistically limited—can be measured at the LHC in proton-lead collisions at $\sqrt$(s_NN)=8.16 TeV. By selecting the 80-100% peripheral centrality class, requiring a rapidity gap between the J/psi and all other detected particles, and vetoing forward neutrons, the hadroproduction background can be suppressed by about 94% while retaining the full photoproduction signal. Using projected Run3+4 luminosity of 1000 $nb^{-1}$, the paper predicts measurable yields in the CMS detector up to transverse momentum PT=20 GeV, twice the reach of the HERA dataset. If correct, this would turn the LHC into a photon-hadron collider for inclusive studies and sharpen tests of quarkonium production mechanisms, particularly the colour-octet contribution.

What carries the argument

The central mechanism is the event-selection strategy built on three observables: the centrality class restricted to 80-100%, which exploits the absence of hadronic activity in photoproduction; the rapidity gap $\Delta\eta_\gamma$, defined as the minimum pseudorapidity distance from the $J/\psi$ to any other particle in the detector, which separates photon-induced from hadronic final states; and the forward-neutron veto using zero-degree calorimeters, which rejects broken lead ions. The quantitative predictions rest on two Monte Carlo tunes with HELAC-Onia+PYTHIA at leading order in NRQCD (non-relativistic QCD): the colour-singlet $^3S_1^{[1]}$ and colour-octet $^1S_0^{[8]}$ contributions are tuned to H1 photoproduction data for the signal, while the $^3S_1^{[1]}$ and $^3S_1^{[8]}$ contributions are tuned to LHCb data for the hadroproduction background, scaled by the number of nucleon-nucleon collisions from ALICE.

What would settle it

A dedicated measurement of the centrality distribution of inclusive J/psi production in pPb collisions at 8.16 TeV would settle the question: if a significant fraction of photoproduction events appear in more central classes because the photon-induced system produces extra particles that shift the centrality estimator, the 80-100% selection would not retain all of the signal, and the predicted yields and purity would drop.

Watch

Extended reading notes

Core claim

The central claim is that inclusive J/psi photoproduction, where a quasi-real photon from the lead ion breaks up the proton, can be cleanly separated from the much larger hadroproduction background in the CMS detector. The separation is achieved with three selection criteria: restricting to the most peripheral centrality class (80-100%), which is expected to contain all photoproduction events and only 6% of hadroproduction events; requiring a rapidity gap Delta_eta_gamma above a PT-dependent threshold chosen to minimise the statistical uncertainty; and vetoing forward neutron activity in the zero-degree calorimeters, which removes residual hadronic collisions with negligible loss of signal. Using leading-order NRQCD Monte Carlo tuned to H1 photoproduction data for the signal and to LHCb pp data for the background, the paper predicts that with 1000 $nb^{-1}$ of Run3+4 data the photoproduced J/psi signal is observable in the CMS acceptance up to PT=20 GeV, with O(10) events in the 16-20 GeV bin in the central rapidity region.

Load-bearing premise

The central assumption is that the most peripheral 80-100% centrality class contains all photoproduction events while holding only 6% of hadroproduction events, a fraction borrowed from ALICE data at 5.02 TeV rather than established for 8.16 TeV proton-lead collisions.

Editorial extensions

If this is right

  • The LHC can produce an inclusive quarkonium photoproduction dataset with PT reach up to 20 GeV, twice the HERA reach, using 1000 nb^-1 of Run3+4 pPb data in CMS.
  • The 80-100% centrality selection removes 94% of the hadroproduction background while retaining the full photoproduction signal.
  • A no-neutron veto in the zero-degree calorimeters rejects essentially no photoproduction signal, with a neutron-emission probability of order 0.01%.
  • The rapidity-gap requirement Delta_eta_gamma > Delta_eta_stat_min_gamma, optimised per PT bin, suppresses the background enough that about 10 signal events are expected in the 16-20 GeV bin in the central rapidity region.
  • The same selection strategy can be applied in ATLAS and, qualitatively, in ALICE and LHCb, enabling multi-experiment inclusive photoproduction studies.

Reading between the lines

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

  • The assumption that the 80-100% centrality class holds all photoproduction events could be tested on existing Run-2 pPb data at 8.16 TeV before Run3+4, since CMS has already recorded such collisions.
  • If the leading-order NRQCD tune underestimates the colour-octet contribution at high PT, the photoproduction signal near PT=20 GeV could be larger than predicted, improving the measurement prospects but altering the expected background-to-signal ratio.
  • The same centrality-plus-gap selection could be extended to other inclusive photon-induced final states, such as Upsilon production or open heavy flavour, generalising the LHC as a photon-hadron collider for inclusive studies.
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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

2 major / 3 minor

Summary. The paper proposes a strategy to measure inclusive J/psi photoproduction in proton-lead collisions at sqrt(s_NN)=8.16 TeV with the CMS detector. The authors use HO+PYTHIA at LO in NRQCD, tune the photoproduction colour-singlet and colour-octet contributions to H1 data and the hadroproduction background to LHCb pp data, then extrapolate to pPb collisions. The proposed selection combines a peripheral (80--100%) centrality class, a pseudorapidity-gap requirement Delta_eta_gamma above a pT-dependent threshold, and a veto on forward neutrons from zero-degree calorimeters. The paper reports expected yields up to pT=20 GeV for an integrated luminosity of 1000 nb^-1 in Run 3+4, and argues that inclusive quarkonium photoproduction is thus accessible at the LHC, extending the kinematic reach beyond HERA.

Significance. If the central projections are correct, the paper would establish inclusive quarkonium photoproduction as a measurable LHC observable, providing a new dataset to constrain colour-octet matrix elements in NRQCD and complementing HERA measurements. The use of an existing LO event generator tuned to external H1 and LHCb data is a sensible and reproducible starting point, and the qualitative selection ingredients -- peripheral centrality, rapidity gaps, and forward-neutron veto -- are physically well motivated. The paper is also honest in referring to the companion work [17] for the detailed derivation. However, the quantitative reach claim (up to pT=20 GeV) rests on an unquantified and largely untested assumption about the photoproduction content of the 80--100% centrality class, which is the main fragility of the analysis.

major comments (2)
  1. [Sec. 3] The statement that the 80--100% centrality class contains 100% of the photoproduction signal and only 6% of the hadroproduction background is load-bearing for every yield in Fig. 2, yet it is not derived or assigned an uncertainty anywhere in the manuscript. The 6% hadroproduction fraction is taken from ALICE pPb data at 5.02 TeV [24], while the 100% photoproduction fraction is an assumption with no model support. The MC presented in the paper does not validate it: Fig. 1 shows the 80--100% centrality class still contains a substantial hadroproduction component, and no centrality-selected photoproduction sample is shown. Photon fluxes extend over all impact parameters, and the 80--100% class is defined by hadronic activity, which is only loosely correlated with impact parameter in pPb. Please either derive the photoproduction fraction using a Glauber/impact-parameter model with the photon flux, or present a sensitivity scan (e.g., signal fraction 70%, 85%, 100%) and show how the yields and the pT=20 GeV reach in Fig. 2 change. Without this, the quoted signal-to-background ratio and the central feasibility claim are not quantitatively supported.
  2. [Sec. 2] The tuning and extrapolation procedure is described only qualitatively, which makes the central projection difficult to assess. The tune factors for the photoproduction (3S1[1], 1S0[8]) and hadroproduction (3S1[1], 3S8[1]) contributions are not tabulated; the fit ranges, chi^2 values, and uncertainties are not given; and the implementation of the A-scaling and N_coll folding is not specified. Since the claimed high-pT reach depends on the shape of the photoproduction pT spectrum and on the background shape after all selection cuts, the reader cannot judge whether the extrapolation from H1 and LHCb data to pPb at 8.16 TeV is reliable. This is also a self-identified limitation: the paper directs the reader to the companion work [17] for details. Please include at least a table of the tuned parameters and a visual comparison of the tuned HO+PYTHIA predictions with the H1 and LHCb data points used, or explicitly state that such details are deferred to [17] and restrict the quantitative claims accordingly.
minor comments (3)
  1. [Sec. 3] The definition of Delta_eta_gamma states that both the charged-track acceptance and the calorimeter acceptance have 'eta_cal < 2.5, pT_cal > 0.4 GeV'; these must be different acceptances in practice. Please clarify the exact pseudorapidity and pT thresholds for the track and calorimeter selections, since the rapidity-gap definition is a central part of the proposed selection.
  2. [Sec. 3 and Fig. 2] The text says that Delta_eta_gamma^stat min is chosen to 'minimise the statistical uncertainty of the sample in the selection region', but the precise minimised quantity is not defined. Please state the criterion (e.g., relative statistical uncertainty, significance) and how the per-pT thresholds shown in Fig. 2 are computed.
  3. [Sec. 3] There are minor typographical issues: 'psuedorapidities' should be 'pseudorapidities', and 'de-exciation' should be 'de-excitation'. Also, the notation 'O( 0.01%)' is unusual; consider writing 'of order 0.01%'.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the quoted yields are extrapolations from independent HERA, LHCb, and ALICE data, and the companion-paper self-citation is not load-bearing.

full rationale

The derivation chain is not circular. The signal Monte Carlo is tuned to H1 HERA photoproduction data and the background Monte Carlo to LHCb pp data; both are then extrapolated to pPb at sqrt(s_NN)=8.16 TeV, so the predicted yields are genuine model extrapolations rather than quantities forced by the inputs. The 6% hadroproduction fraction in the 80-100% centrality class is taken from external ALICE pPb data [24], and the statement that this class contains 100% of the photoproduction signal is a physically motivated modeling assumption (coherent photon emission leaves the Pb ion essentially intact), not a parameter fitted to the target prediction. That assumption is the main fragility of the projection, but it is a correctness risk rather than a circular reduction. The only self-citation is to the companion paper [17] for the photo-to-hadroproduction cross-section ratio and for more detailed detector-specific discussion; the present paper contains its own MC-based figures and selection study, so the self-citation is not load-bearing for the central claim. No equation is shown to equal its own input, and no fitted parameter is renamed as a prediction.

Assumptions & free parameters 4 free parameters · 5 assumptions · 0 invented entities

The central projection rests on a standard NRQCD plus parton-shower MC framework with four effective tune or normalization parameters fit to external data, plus several domain assumptions about how those fits extrapolate to pPb. No new particles, forces, or conserved quantities are introduced. The most paper-specific assumption is the 100% signal fraction in the 80-100% centrality class.

free parameters (4)
  • Photoproduction colour-singlet tune factor (3S1[1]) = not quoted
    Used in Sec. 2 to match HO+PYTHIA to H1 photoproduction data; the resulting pPb signal yield inherits this fitted normalization.
  • Photoproduction colour-octet tune factor (1S8[0]) = not quoted
    Fitted together with the singlet contribution to H1 data in Sec. 2; the octet normalization is a free parameter of the NRQCD model.
  • Hadroproduction background tune factors (3S1[1] and 3S8[1]) = not quoted, then scaled by A
    Determined by comparing HO+PYTHIA to LHCb pp data at 5 TeV (Sec. 2) and scaled by the lead mass number; central to the background yield estimate.
  • Delta_eta_gamma^stat min thresholds = values between 2.4 and 4.8 depending on PT bin (Fig. 2)
    Chosen by hand to minimize the statistical uncertainty of the selected sample in each PT bin (Sec. 3); the reported yields depend on these choices.
assumptions (5)
  • domain assumption NRQCD factorization with colour singlet and colour octet contributions describes inclusive quarkonium photoproduction sufficiently well at LO after tuning.
    Adopted in Secs. 1 and 2 as the framework for signal and background MC; the paper notes that no existing model describes all inclusive quarkonium data simultaneously [9], so this is an assumption.
  • domain assumption The HO+PYTHIA LO parton-shower MC, after tuning to HERA and LHCb data, extrapolates reliably to pPb collisions at 8.16 TeV.
    Used throughout Sec. 2; the paper acknowledges quarkonia are sensitive to higher-order QCD corrections and that no beyond-LO generator exists, so the extrapolation is a model assumption.
  • ad hoc to paper The 80-100% centrality class measured by ALICE at 5.02 TeV contains 100% of inclusive photoproduction events.
    Stated in Sec. 3 without derivation; the basis is ALICE centrality-dependence data [24] at a different energy. This assumption directly controls the signal efficiency of the proposed selection.
  • domain assumption Neutron emissions in photoproduced J/psi events are sufficiently rare that a no-neutron veto retains almost all signal.
    Sec. 3 estimates a probability of O(0.01%) using methods from [25,26]; this is required for the far-forward veto to be a high-efficiency signal selection.
  • domain assumption The equivalent-photon approximation and the Z^2-enhanced photon flux from the lead ion describe the photon beam in pPb UPCs.
    Implicit in modeling photoproduction in pPb and in the statement that the lead ion has a photon flux enhanced by Z^2 (Sec. 1).

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Cite this review

Pith. "Pith review of Inclusive photoproduction of vector quarkonium in ultra-peripheral collisions at the LHC." pith.science (2026). https://pith.science/paper/MTVUKNRG

@misc{pith2026250112182,
  author       = {Pith},
  title        = {Pith review of: Inclusive photoproduction of vector quarkonium in ultra-peripheral collisions at the LHC},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/MTVUKNRG}},
  note         = {Machine review of arXiv:2501.12182}
}
abstract

We explore the prospects of extending the LHC from a hadron-hadron to a photon-hadron collider and performing studies of inclusive quarkonium photoproduction. We perform an extrapolation from HERA data to predict the yields of photoproduced $J/\psi$ mesons in proton-lead collisions. Similarly, we perform an extrapolation from LHC data to model the large hadronic background. Inclusive photoproduction can be isolated from this background in the LHC detectors, namely, ALICE, ATLAS, CMS, and LHCb by imposing constraints on the hadronic activity in the main detector and in the far-forward region. This work focuses on the CMS detector.

Figures

Figures reproduced from arXiv: 2501.12182 by the authors.

Figure 1
Figure 1. Yield for 𝐽/𝜓 → 𝜇𝜇 as a function of Δ𝜂𝛾 in the CMS acceptance using projected Run3+4 luminosity, for the singlet (dashed) and octet (solid) tunes of photoproduction (blue) and hadroproduction in the 80–100% (grey) and 0– 100% (red) CC. As for rapidity gaps, we define Δ𝜂𝛾 ≡ min{|𝜂𝛾-edge − 𝜂𝑖 |} for 𝑖 ≠ 𝐽/𝜓, where 𝜂𝛾-edge is the pseudorapidity of the edge of the detector on the lead-going side and 𝜂𝑖 are the psuedorap… view at source ↗
Figure 2
Figure 2. shows the predicted yield of photoproduced 𝐽/𝜓 (blue) and the hadroproduced background (grey) after selecting the 80–100% CC and requiring Δ𝜂𝛾 > Δ𝜂 stat min 𝛾 . The slope of the photoproduction signal falls more steeply in 𝑃𝑇 than that of the hadroproduction background and so we compute Δ𝜂 stat min 𝛾 per bin in 𝑃𝑇 (values are indicated on the figures). Yields are given for 𝐽/𝜓 in the CMS acceptance in three rapidity… view at source ↗

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