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arxiv: 2508.18438 · v2 · submitted 2025-08-25 · ✦ hep-ph · hep-ex

Evaluating the ratio of the exclusive vector meson photoproduction to inclusive hadron/jet production cross section in ultraperipheral heavy ion collisions

Joao Vitor C. Lovato , Edgar Huayra , Magno V.T. Machado This is my paper

Pith reviewed 2026-05-18 20:51 UTC · model grok-4.3

classification ✦ hep-ph hep-ex
keywords ultraperipheral collisionsvector meson photoproductioninclusive hadron productionparton saturationcolor dipole modelheavy ion collisionsLHC Run 4
0
0 comments X

The pith

The double ratio of exclusive vector meson to inclusive hadron production cross sections in ultraperipheral AA over pA collisions offers a probe for parton saturation.

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

This paper applies the QCD color dipole picture to compute the ratio of exclusive vector meson photoproduction cross sections to inclusive hadron or jet production cross sections in ultraperipheral heavy ion collisions. It evaluates this ratio for proton-nucleus and nucleus-nucleus systems and examines its dependence on transverse momentum and atomic number. The double ratio R_UPC between AA and pA cases is presented as a new observable for parton saturation physics, with explicit predictions for LHC Run 4 kinematics. A sympathetic reader would care because the approach uses existing collider data to test nonlinear gluon dynamics in nuclear environments.

Core claim

Within the color dipole framework the ratio of elastic vector meson photoproduction to inclusive hadron or jet production exhibits characteristic dependencies on transverse momentum and atomic number; the double ratio R_UPC defined as the AA result divided by the pA result is proposed as a clean observable that isolates parton saturation effects, with numerical predictions supplied for LHC Run 4 pA and AA collisions.

What carries the argument

The QCD color dipole picture used to model both exclusive vector meson photoproduction and inclusive hadron or jet production through the same dipole-nucleus scattering amplitudes.

If this is right

  • The ratio of exclusive to inclusive cross sections depends on the transverse momentum of the produced hadron or jet.
  • The ratio depends on the atomic number of the colliding nuclei.
  • The double ratio R_UPC deviates from one in the presence of saturation and is computed explicitly for Run 4.
  • Predictions are given for both pA and AA ultraperipheral collisions at LHC energies.

Where Pith is reading between the lines

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

  • This ratio observable could be measured in existing LHC data sets to cross-check saturation signals seen in other channels such as forward hadron production.
  • Extending the calculation to different vector mesons would test whether the double ratio remains a robust saturation indicator.
  • The approach suggests a way to link photoproduction measurements directly to expectations from nuclear deep inelastic scattering.

Load-bearing premise

The color dipole picture applies consistently to both exclusive vector meson and inclusive hadron or jet photoproduction in the same kinematic regime without process-specific adjustments.

What would settle it

A measurement at the LHC in which the double ratio R_UPC remains consistent with unity over the predicted range of hadron or jet transverse momentum would falsify the claim that this observable isolates saturation effects.

Figures

Figures reproduced from arXiv: 2508.18438 by Edgar Huayra, Joao Vitor C. Lovato, Magno V.T. Machado.

Figure 1
Figure 1. Figure 1: (a) The ratio between the cross section for exclusive vector meson photoproduction and [PITH_FULL_IMAGE:figures/full_fig_p010_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: The UPC ratio as a function of the open meson transverse momentum (ultra–peripheral [PITH_FULL_IMAGE:figures/full_fig_p010_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: The ratios between the cross sections for exclusive vector meson photoproduction, such [PITH_FULL_IMAGE:figures/full_fig_p012_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: The UPC ratio as a function of the atomic number. Same notation as in the previous [PITH_FULL_IMAGE:figures/full_fig_p012_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: The ratios between the cross sections for exclusive vector meson photoproduction, such [PITH_FULL_IMAGE:figures/full_fig_p013_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: The UPC ratio as a function of the atomic number. Same notation as in the previous [PITH_FULL_IMAGE:figures/full_fig_p014_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Comparison of the nuclear ratio σel/ dσ dp2 ⊥ for jet production in (a) pPb, (b) PbPb, and (c) the corresponding UPC ratio. The transverse momentum is fixed, p⊥ = 1 GeV. Acknowledgments We would like to thank Emmanuel G. de Oliveira for fruitful discussions. This work was supported by FAPESC, INCT-FNA (464898/2014-5), and National Council for Scientific and Technological Development – CNPq (Brazil) for JVC… view at source ↗
read the original abstract

Using the QCD color dipole picture to study exclusive vector meson and inclusive jet/open meson photoproduction, we calculate the ratio of elastic meson production to inclusive hadron production cross sections for ultraperipheral heavy ion collisions. Predictions are evaluated for run 4 of the Large Hadron Collider in proton-nucleus ($pA$) and nucleus-nucleus ($AA$) collisions. The dependencies of the ratio on jet/hadron transverse momentum and atomic number are investigated. The double ratio $R_{\mathrm{UPC}}$ for $AA$ over $pA$ collisions is also computed, which has been previously proposed as a new observable probing parton saturation physics.

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 manuscript employs the QCD color dipole framework to compute the ratio of exclusive vector-meson photoproduction cross sections to inclusive hadron or jet production cross sections in ultraperipheral pA and AA collisions. It presents numerical predictions for LHC Run 4 kinematics, examines the dependence of the ratio on transverse momentum and atomic number, and evaluates the double ratio R_UPC (AA over pA) as a proposed observable for parton saturation effects.

Significance. If the central modeling assumption holds, the work supplies concrete, falsifiable predictions for an observable that could help isolate saturation-scale effects in UPCs. The explicit evaluation of R_UPC for forthcoming Run-4 data and the exploration of its pT and A dependence constitute a useful contribution to the saturation-physics program, provided the shared dipole parametrization is shown to be robust across the two channels.

major comments (2)
  1. [Sections 2–3 (model setup and exclusive/inclusive formulations)] The manuscript applies a single color-dipole amplitude (with fixed saturation scale, impact-parameter profile, and gluon distribution) to both exclusive vector-meson production (dominated by r ∼ 1/Q) and inclusive jet/hadron production (integral over a broad range of dipole sizes and kT). No dedicated consistency check or sensitivity study is presented that quantifies how differences in the effective weighting of the dipole cross section between the two processes affect the ratio or the double ratio R_UPC. This assumption is load-bearing for the claim that R_UPC isolates saturation physics.
  2. [Section 5 (results and R_UPC)] The double ratio R_UPC is introduced as a new saturation diagnostic, yet the propagation of uncertainties from the dipole-model parameters (fitted to earlier data) into R_UPC is not quantified. Without error bands or a parameter-variation study, it is difficult to assess whether the predicted deviation from unity is experimentally distinguishable from model systematics.
minor comments (3)
  1. [Section 2] Notation for the dipole amplitude and the saturation scale should be unified between the exclusive and inclusive sections to avoid reader confusion.
  2. [Figures 3–5] Figure captions for the pT and A dependence plots should explicitly state the kinematic cuts and the vector-meson species used.
  3. [Introduction] A short paragraph comparing the present ratio to earlier dipole-model studies of UPC vector-meson production would help place the new observable in context.

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 indicate the changes planned for the revised version.

read point-by-point responses

  1. Referee: [Sections 2–3 (model setup and exclusive/inclusive formulations)] The manuscript applies a single color-dipole amplitude (with fixed saturation scale, impact-parameter profile, and gluon distribution) to both exclusive vector-meson production (dominated by r ∼ 1/Q) and inclusive jet/hadron production (integral over a broad range of dipole sizes and kT). No dedicated consistency check or sensitivity study is presented that quantifies how differences in the effective weighting of the dipole cross section between the two processes affect the ratio or the double ratio R_UPC. This assumption is load-bearing for the claim that R_UPC isolates saturation physics.

    Authors: The color-dipole framework is applied in a unified manner, with the same amplitude entering both the exclusive and inclusive calculations; the distinct dipole-size weightings are already encoded in the respective cross-section expressions (Eqs. (2)–(4) for exclusive and Eqs. (7)–(9) for inclusive). Nevertheless, we agree that an explicit robustness discussion would strengthen the presentation. In the revised manuscript we will add a short paragraph in Section 3 that recalls the standard use of a common dipole parametrization in the literature and performs a limited sensitivity study by varying the saturation scale Q_s and the impact-parameter profile within their fit uncertainties, showing the resulting variation in the ratio and in R_UPC. revision: partial

  2. Referee: [Section 5 (results and R_UPC)] The double ratio R_UPC is introduced as a new saturation diagnostic, yet the propagation of uncertainties from the dipole-model parameters (fitted to earlier data) into R_UPC is not quantified. Without error bands or a parameter-variation study, it is difficult to assess whether the predicted deviation from unity is experimentally distinguishable from model systematics.

    Authors: We acknowledge that a quantitative uncertainty estimate is desirable. Because R_UPC is a ratio of ratios, a partial cancellation of overall normalization uncertainties occurs; however, we agree that this should be demonstrated explicitly. In the revised version we will include error bands on the R_UPC curves obtained by propagating the main parameter variations (saturation scale, gluon-distribution parameters) and will add a brief discussion of the size of these bands relative to the predicted deviation from unity. revision: yes

Circularity Check

0 steps flagged

No significant circularity in model-based ratio predictions

full rationale

The paper applies the standard QCD color dipole framework to compute cross-section ratios for exclusive vector-meson photoproduction versus inclusive hadron/jet production in UPCs. Dipole amplitudes are taken from established parametrizations in the literature (typically fitted to HERA data), then evaluated at the relevant kinematics for LHC Run 4 pA and AA collisions to obtain the ratio and the double ratio R_UPC. No equation reduces the output to a tautology, no parameter is fitted to the target observable and then relabeled a prediction, and no load-bearing step relies on a self-citation that itself assumes the result. The derivation remains self-contained against external benchmarks and produces genuine forward predictions for new measurements.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central results rest on the applicability of the color dipole model to both exclusive and inclusive photoproduction channels and on dipole amplitudes fitted to prior data.

axioms (1)
  • domain assumption The color dipole picture consistently describes both exclusive vector meson and inclusive jet/hadron photoproduction in ultraperipheral collisions.
    Invoked to compute the ratio within a single framework.

pith-pipeline@v0.9.0 · 5654 in / 1274 out tokens · 40495 ms · 2026-05-18T20:51:47.824814+00:00 · methodology

discussion (0)

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