arxiv: 2604.07300 · v1 · submitted 2026-04-08 · ✦ hep-ph · hep-ex

Recognition: no theorem link

Constraining magnetic monopoles and multiply charged particles with diphoton events at the LHC

Authors on Pith no claims yet

Pith reviewed 2026-05-10 17:53 UTC · model grok-4.3

classification ✦ hep-ph hep-ex

keywords magnetic monopolesHECOslight-by-light scatteringcentral exclusive productionLHC diphoton eventseffective field theoryBorn-Infeld modelproton tagging

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The pith

LHC diphoton data excludes magnetic monopoles and high-electric-charge objects up to tens of TeV

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

The paper investigates the effects of virtual magnetic monopoles and high-electric-charge objects on light-by-light scattering in high-energy proton collisions. It uses measurements of central exclusive diphoton production from the CMS-TOTEM experiment at the LHC to set limits on the masses of these particles. Models from effective field theory and the Born-Infeld scenario are applied, with resummation techniques to handle strong couplings. This indirect approach allows constraints on particles that may not be produced directly at current energies but could influence observable processes. A reader would care if these particles exist because they relate to fundamental questions like electric charge quantization and potential explanations for dark matter.

Core claim

Measurements of central exclusive photon pair production with proton tagging in LHC Run 2 data are used to constrain the contributions of virtual monopoles and HECOs to light-by-light scattering. In effective field theories and a Born-Infeld scenario, with resummation for large couplings, this leads to the exclusion of masses of up to a few tens of TeV for monopoles and HECOs of various spins and magnetic and electric charges.

What carries the argument

Virtual particle contributions to light-by-light scattering in diphoton events, modeled using effective field theories and the Born-Infeld scenario with resummation techniques.

If this is right

Monopoles with different spins and magnetic charges are excluded below masses of tens of TeV.
HECOs with high electric charges are similarly excluded up to tens of TeV.
This provides complementary constraints to direct searches for these particles.
The use of resummation enables reliable modeling even for large couplings.

Where Pith is reading between the lines

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

These limits could guide searches in future higher-energy colliders.
Similar techniques might apply to other beyond-Standard-Model particles affecting photon interactions.
If the exclusions hold, it suggests such particles, if they exist, are very heavy and perhaps not relevant for low-energy phenomena.

Load-bearing premise

The theoretical modeling of virtual monopoles and HECOs in light-by-light scattering using effective theories and Born-Infeld with resummation is accurate enough to derive reliable limits from the diphoton data.

What would settle it

An observation of diphoton production rates or distributions in central exclusive processes that cannot be explained by the Standard Model plus the included virtual contributions from monopoles or HECOs at the excluded mass scales would challenge the derived constraints.

read the original abstract

The LHC is achieving energies never reached before, opening up possibilities for the discovery of exotic particles in the TeV mass range. Such states include magnetic monopoles, which can explain the electric charge quantisation and restore the symmetry in Maxwell's equations with respect to the magnetic and electric fields. Scenarios proposed to shed light to dark matter and neutrino masses introduce high-electric-charge objects (HECOs). The existence of both classes of particles can be probed in precision measurements in a manner complementary to direct searches. We focus on the contributions of such virtual particles to light-by-light scattering in the context of effective field theories and a Born-Infeld scenario. Specifically, measurements of central exclusive production of photon pairs with proton tagging carried out by the CMS-TOTEM Precision Proton Spectrometer with LHC Run 2 proton-proton collision data are used to constrain magnetic monopole and HECOs. Resummation techniques have been employed to deal with the large HECO-photon coupling. Masses of up to a few tens of TeV have been excluded for monopoles and HECOs of various spins and magnetic and electric charges, respectively.

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

The paper turns existing CMS-TOTEM diphoton data into new mass limits on monopoles and HECOs via virtual light-by-light contributions, but the resummation in the EFT and Born-Infeld setups is the part that needs checking.

read the letter

The main thing to know is that this work takes the measured central exclusive diphoton cross section from LHC Run 2 and derives exclusion limits on magnetic monopoles and high-electric-charge objects up to a few tens of TeV, for several spins and charge assignments. It does this by computing the virtual particle effects on photon-photon scattering in effective field theory plus a Born-Infeld Lagrangian, with resummation applied to handle the large couplings. That produces the headline result of new bounds that were not in the literature before. The paper does a straightforward job of scanning the relevant parameters and showing how the limits vary with spin and charge, which is useful for anyone mapping out charge quantization or duality scenarios. It sticks to real data rather than pure theory projections, and the circularity risk looks low since the experimental measurement is independent of the new-physics calculation. The soft spot is exactly the one flagged in the stress-test note: the resummation for couplings well above unity. When the charge is large and the mass is far above the LHC scale, it is not automatic that the resummed amplitude stays under control or that higher-order or non-perturbative pieces are negligible. The abstract states the limits clearly but leaves the validation steps and systematic treatment implicit, so a referee would need to see explicit checks on convergence and on how the SM prediction plus experimental uncertainties compare to the size of the new-physics shift. If those checks hold up in the full text, the limits are credible; if not, they could be overstated. This is the kind of paper that belongs in a reading group for people working on BSM models with monopoles or exotic charges, or for phenomenologists who follow indirect collider constraints. It is not paradigm-shifting, but it adds concrete numbers from existing data. I would send it to peer review rather than desk-reject it, with the referee brief focused on the resummation procedure and the robustness of the EFT modeling against the data precision.

Referee Report

2 major / 1 minor

Summary. The paper investigates constraints on magnetic monopoles and high-electric-charge objects (HECOs) through their virtual effects on light-by-light scattering in central exclusive diphoton production at the LHC. Utilizing CMS-TOTEM Precision Proton Spectrometer data from Run 2 proton-proton collisions, the authors employ effective field theory frameworks and a Born-Infeld scenario to model these contributions. Resummation techniques are applied to handle large couplings, leading to the exclusion of masses up to several tens of TeV for monopoles and HECOs with various spins, magnetic charges, and electric charges.

Significance. If the theoretical modeling and experimental interpretation are robust, this study provides valuable complementary limits on exotic particles that may address electric charge quantization and dark matter. It demonstrates the power of precision measurements in constraining high-mass states beyond direct production searches, potentially impacting a range of BSM models.

major comments (2)

The derivation of the mass limits hinges on the resummed amplitudes in the EFT and Born-Infeld approaches for virtual particle contributions to the diphoton cross section. However, the manuscript lacks a clear validation of the resummation procedure for couplings larger than unity, raising concerns about whether higher-order or non-perturbative effects are adequately captured.
Insufficient information is provided on the implementation details of the EFT, including cutoff choices, matching conditions, and how systematic uncertainties in the theoretical prediction and experimental data are handled. This is essential to substantiate the claimed exclusions up to tens of TeV.

minor comments (1)

The abstract mentions 'various spins and magnetic and electric charges' but does not specify the exact values considered, which would help readers quickly assess the scope of the results.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and the constructive comments, which will help improve the clarity and robustness of our results. We address each major comment below and will revise the manuscript accordingly.

read point-by-point responses

Referee: The derivation of the mass limits hinges on the resummed amplitudes in the EFT and Born-Infeld approaches for virtual particle contributions to the diphoton cross section. However, the manuscript lacks a clear validation of the resummation procedure for couplings larger than unity, raising concerns about whether higher-order or non-perturbative effects are adequately captured.

Authors: We appreciate the referee's concern on this point. The resummation is performed using standard leading-logarithmic techniques applied to the effective photon couplings, consistent with approaches used in the literature for large-charge scenarios. We agree that explicit validation for couplings exceeding unity would strengthen the presentation. In the revised manuscript, we will add a new subsection (or appendix) providing validation tests, including comparisons of the resummed amplitude against fixed-order perturbative results at moderate couplings and convergence checks of the series. We will also clarify that our limits are derived conservatively by restricting the resummed contribution to the regime where the EFT remains valid, and that unaccounted higher-order or non-perturbative effects would typically only strengthen the exclusions. This addresses the potential limitations while preserving the robustness of the reported mass bounds. revision: yes
Referee: Insufficient information is provided on the implementation details of the EFT, including cutoff choices, matching conditions, and how systematic uncertainties in the theoretical prediction and experimental data are handled. This is essential to substantiate the claimed exclusions up to tens of TeV.

Authors: We thank the referee for this observation. While the manuscript outlines the overall EFT framework and Born-Infeld scenario, we acknowledge that specific implementation details were not fully elaborated. In the revised version, we will expand the relevant sections to explicitly state: the cutoff scale is chosen as the mass of the heavy particle to ensure proper decoupling; matching conditions are performed by equating the EFT coefficients to the full theory at the particle threshold; and systematic uncertainties are handled by propagating theoretical errors from EFT truncation (via higher-dimensional operators) together with experimental systematics from the CMS-TOTEM diphoton spectrum, proton tagging efficiency, and luminosity. These additions will be accompanied by a brief discussion of how they affect the final mass limits, thereby substantiating the exclusions up to tens of TeV. revision: yes

Circularity Check

0 steps flagged

No circularity: limits derived by comparing independent EFT predictions to external CMS-TOTEM data

full rationale

The derivation computes virtual-particle contributions to light-by-light scattering in EFT/Born-Infeld frameworks (with resummation for large couplings) and then compares the resulting cross-section predictions against measured central exclusive diphoton data. No step reduces a prediction to a fitted parameter from the same dataset, no self-definition equates input to output, and no load-bearing premise collapses to a self-citation chain. The central claim therefore rests on external experimental input rather than internal re-labeling or construction.

Axiom & Free-Parameter Ledger

1 free parameters · 3 axioms · 0 invented entities

Based solely on the abstract, the analysis rests on standard effective field theory assumptions for virtual particle effects and a specific resummation procedure for strong couplings; no new particles are invented here, and free parameters are the varied spins and charges rather than fitted constants.

free parameters (1)

spins and charges of monopoles and HECOs
The paper scans over different spin and charge values to derive separate exclusion limits rather than fitting a single global parameter.

axioms (3)

domain assumption Effective field theory accurately captures virtual contributions of monopoles and HECOs to light-by-light scattering
Invoked to translate particle properties into observable effects on diphoton production.
domain assumption Born-Infeld nonlinear electrodynamics provides a valid alternative scenario for strong photon couplings
Used alongside EFT to model possible non-linear effects.
ad hoc to paper Resummation techniques correctly handle large HECO-photon couplings
Explicitly mentioned as necessary to deal with strong coupling regime.

pith-pipeline@v0.9.0 · 5499 in / 1595 out tokens · 37192 ms · 2026-05-10T17:53:49.460741+00:00 · methodology

discussion (0)

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

Magnetic Monopoles -- From Dirac to the Large Hadron Collider
hep-ex 2026-05 unverdicted

Magnetic monopoles are theoretically well-motivated but remain unobserved after extensive searches in cosmic rays and at particle colliders such as the LHC.

Reference graph

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Yang, Y.-C

J.-C. Yang, Y.-C. Guo, B. Liu and T. Li, Shining light on magnetic monopoles through high-energy muon colliders , Nucl. Phys. B 987 (2023) 116097 [2208.02188]

work page arXiv 2023

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