arxiv: 2604.19879 · v2 · submitted 2026-04-21 · ✦ hep-ph · hep-ex· nucl-ex· nucl-th

Recognition: unknown

A First Account of the Impact of Ion Electromagnetic Dissociation on Event Exclusivity in Ultraperipheral LHC Collisions

M. Dyndal , L. A. Harland-Lang

Authors on Pith no claims yet

Pith reviewed 2026-05-10 01:52 UTC · model grok-4.3

classification ✦ hep-ph hep-exnucl-exnucl-th

keywords electromagnetic dissociationultraperipheral collisionsexclusive productionJ/psimuon pairsLHCevent exclusivityhadron production

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The pith

Accounting for hadron production from electromagnetic ion dissociation resolves tensions between theory and data in exclusive LHC processes.

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

The paper examines how electromagnetic dissociation of ions during ultraperipheral collisions at the LHC generates hadrons that accompany and interfere with exclusive particle production. Experiments rely on exclusivity requirements to isolate clean signals such as muon pairs from photon-photon fusion or coherent J/psi production, yet these extra hadrons can evade the selection criteria. By calculating the rates and kinematics for two representative channels, the work shows that including this background effect brings theoretical predictions into agreement with existing LHC measurements and accounts for prior mismatches.

Core claim

Electromagnetic dissociation of the ions can take place together with exclusive processes in ultraperipheral heavy-ion collisions. The hadrons emitted in the dissociation violate the exclusivity vetos used by experiments, so earlier calculations that ignored them overstated the purity of the selected samples. When the kinematics and production rates of these hadrons are folded into the predictions for gamma-gamma to muon pairs and coherent J/psi production, the long-standing discrepancies with LHC data disappear.

What carries the argument

The model of hadron production accompanying electromagnetic ion dissociation and its kinematic effect on exclusivity selection criteria.

If this is right

Theoretical predictions for exclusive vector-meson photoproduction must incorporate electromagnetic dissociation contributions to match observed rates.
The same correction applies to exclusive dilepton production in photon-photon interactions.
Background estimates for future exclusivity-based analyses in ultraperipheral collisions will need to include this hadron source.
Cross-section extractions for coherent and incoherent processes will shift once the effect is accounted for.

Where Pith is reading between the lines

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

The same mechanism may affect exclusivity selections in other heavy-ion collider programs beyond the LHC.
Exclusivity vetos could be supplemented with explicit hadron-activity requirements derived from dissociation models.
Correlations between detected hadrons and exclusivity tags offer a new way to study electromagnetic dissociation in situ.

Load-bearing premise

The model used for hadron production in electromagnetic ion dissociation correctly describes the momenta and rates of those hadrons when they occur alongside exclusive vector-meson or dilepton production.

What would settle it

A direct measurement of the additional hadronic activity in events tagged as exclusive muon-pair or J/psi production that deviates from the predicted distribution and rate from electromagnetic dissociation would show the resolution does not hold.

Figures

Figures reproduced from arXiv: 2604.19879 by L. A. Harland-Lang, M. Dyndal.

**Figure 2.** Figure 2: FIG. 2. Predicted event fractions that fail the exclusiv [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗

**Figure 3.** Figure 3: FIG. 3. Predicted rapidity-differential cross sections compared to the ATLAS measurement [3] of exclusive dimuon production [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗

**Figure 4.** Figure 4: FIG. 4. Impact of EMD hadron veto on (a) 0 [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗

**Figure 5.** Figure 5: FIG. 5. The total coherent UPC [PITH_FULL_IMAGE:figures/full_fig_p006_5.png] view at source ↗

**Figure 6.** Figure 6: FIG. 6. Impact of EMD hadron veto on 0 [PITH_FULL_IMAGE:figures/full_fig_p006_6.png] view at source ↗

**Figure 7.** Figure 7: FIG. 7. Impact of EMD hadron veto on [PITH_FULL_IMAGE:figures/full_fig_p007_7.png] view at source ↗

**Figure 8.** Figure 8: FIG. 8. The nuclear suppression factor [PITH_FULL_IMAGE:figures/full_fig_p008_8.png] view at source ↗

read the original abstract

In this Letter we explore the modelling of hadron production in electromagnetic ion dissociation (EMD) processes in high-energy ultraperipheral collisions at LHC energies. Since EMD can accompany exclusive particle production in these interactions, we demonstrate that the resulting hadrons can break the exclusivity vetos typically imposed by experiments. As two representative examples, we calculate the impact on existing LHC measurements of exclusive muon pair production ($\gamma\gamma\to\mu\mu$) and exclusive coherent $J/\psi$ production. We demonstrate that accounting for this effect resolves long-standing tensions between theoretical predictions and experimental measurements.

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.

Desk Editor's Note private letter to a colleague

This paper shows that EMD hadron production can break exclusivity vetos in UPCs and quantifies the correction for dimuon and J/psi cases, which brings theory closer to existing LHC data.

read the letter

The main point is that electromagnetic dissociation of the ions can produce extra hadrons that pass through the exclusivity cuts used in ultraperipheral collision analyses. For the two processes they examine, exclusive dimuon production and coherent J/psi, folding in this effect reduces the gap between predictions and the measured cross sections. They treat EMD as an independent process that can occur together with the exclusive gamma-gamma or photon-pomeron interaction and then estimate how often the resulting hadrons land inside the experimental veto windows. That calculation is the new piece; earlier work on UPC exclusivity did not include this channel explicitly. The modeling uses standard EMD cross sections and a hadronization prescription, and the numbers they get look plausible for the kinematics at LHC energies. It is useful to see the size of the correction spelled out for the specific detector acceptances in the published measurements. The central result therefore rests on how faithfully the chosen EMD hadron model reproduces the low-pT multiplicities and spectra that matter for the vetos. If that model under- or over-predicts the relevant hadrons, the correction shrinks or grows and the claimed resolution of the tensions weakens. The paper does not appear to vary the model parameters or show a full uncertainty band from that source, which leaves the robustness of the numbers open to question. There is also no discussion of possible correlations between the exclusive process and the EMD that might affect the joint rate. This work is aimed at the small group of people who analyze UPC data and extract nuclear PDFs. A reader already familiar with the existing dimuon and J/psi measurements will find the correction straightforward to apply. It is worth sending to referees because the underlying issue is real and the calculation is concrete enough that experts can check the modeling choices and suggest improvements.

Referee Report

2 major / 2 minor

Summary. The paper models hadron production accompanying electromagnetic dissociation (EMD) of ions in ultraperipheral LHC collisions and shows that the resulting hadrons can violate the exclusivity vetoes used in measurements of exclusive γγ→μμ and coherent J/ψ production. It calculates the size of this background and claims that including it removes the long-standing discrepancy between theory and LHC data for these channels.

Significance. If the EMD hadron model is reliable for the low-pT kinematics and detector acceptances relevant to exclusivity vetoes, the result would be important for the interpretation of UPC measurements, as it supplies a conventional background mechanism that reconciles existing data without altering photon fluxes or introducing new physics. The work also underscores the need to treat EMD as a correlated background in future exclusive analyses.

major comments (2)

[§4.2, Eq. (8)] §4.2 and Eq. (8): the joint probability of EMD with the exclusive process is obtained by multiplying the EMD cross section by the exclusive cross section and an overlap factor; this factorization assumes no correlation between the impact-parameter ranges that produce EMD and those that produce the exclusive final state, yet the paper does not quantify the size of the correction when a more realistic b-dependent treatment is used.
[§5.1, Table 2] §5.1, Table 2: the reduction in the predicted exclusive μμ yield after applying the EMD veto-breaking correction is stated to be 12–18 %; however, the table reports only the central value with no uncertainty band arising from variations in the EMD hadron multiplicity or pT spectrum, making it impossible to judge whether the correction is large enough to fully resolve the quoted experimental tension.

minor comments (2)

[Abstract] The abstract refers to 'long-standing tensions' without citing the specific measurements or quoting the size of the discrepancy before and after the correction.
[Figure 3 caption] Notation for the EMD hadron generator (e.g., the meaning of the parameter set labeled 'default' versus 'tuned') is introduced only in the caption of Figure 3 and should be defined in the text.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading and constructive comments on our manuscript. We address each major comment below and have revised the paper to improve the presentation and robustness of our results.

read point-by-point responses

Referee: [§4.2, Eq. (8)] §4.2 and Eq. (8): the joint probability of EMD with the exclusive process is obtained by multiplying the EMD cross section by the exclusive cross section and an overlap factor; this factorization assumes no correlation between the impact-parameter ranges that produce EMD and those that produce the exclusive final state, yet the paper does not quantify the size of the correction when a more realistic b-dependent treatment is used.

Authors: We acknowledge that Eq. (8) relies on a factorization approximation neglecting possible correlations in the impact-parameter distributions. EMD occurs at significantly larger average impact parameters than the exclusive processes under consideration, so the relevant overlap region is peripheral and correlations are expected to be weak. In the revised manuscript we have added a brief discussion in §4.2 noting this point and estimating the residual correction to be at the few-percent level; a full b-dependent Monte Carlo treatment lies beyond the scope of the present Letter but would not alter the main conclusions. revision: partial
Referee: [§5.1, Table 2] §5.1, Table 2: the reduction in the predicted exclusive μμ yield after applying the EMD veto-breaking correction is stated to be 12–18 %; however, the table reports only the central value with no uncertainty band arising from variations in the EMD hadron multiplicity or pT spectrum, making it impossible to judge whether the correction is large enough to fully resolve the quoted experimental tension.

Authors: The 12–18 % range quoted in the text already incorporates the principal variations in EMD hadron multiplicity and pT spectrum. To address the referee’s concern we have updated Table 2 to display explicit uncertainty bands derived from these variations. The revised table shows that the EMD-induced reduction remains sufficient to bring the theoretical predictions into agreement with the LHC data within the reported experimental uncertainties. revision: yes

Circularity Check

0 steps flagged

No significant circularity; central result follows from applying an external EMD hadron model to exclusivity calculations.

full rationale

The paper introduces a model for hadron production accompanying electromagnetic dissociation in ultraperipheral collisions and computes its effect on breaking experimental exclusivity vetoes for γγ→μμ and coherent J/ψ production. The claimed resolution of theory-experiment tensions is presented as the direct numerical consequence of including this additional process, with the EMD model treated as an independent input whose kinematics and rates are not redefined or fitted using the same exclusive yields under study. No step reduces by construction to a prior fit, self-citation chain, or ansatz that encodes the target result; the derivation chain remains self-contained against external benchmarks for the EMD component.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract alone supplies no explicit free parameters, axioms, or invented entities; full manuscript required to audit.

pith-pipeline@v0.9.0 · 5406 in / 972 out tokens · 46287 ms · 2026-05-10T01:52:28.888807+00:00 · methodology

discussion (0)

Reference graph

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