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arxiv: 1906.09280 · v1 · pith:LMS6FNTCnew · submitted 2019-06-21 · ✦ hep-ph · hep-ex· nucl-ex· nucl-th

Perspectives of photon physics at future colliders

M. Klasen This is my paper

Pith reviewed 2026-05-25 18:39 UTC · model grok-4.3

classification ✦ hep-ph hep-exnucl-exnucl-th
keywords photon physicshigh-luminosity LHCElectron-Ion Collidernuclear parton densitiesStandard Model measurementsbeyond Standard Modeljet measurements
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The pith

Photon-induced processes at the high-luminosity LHC and Electron-Ion Collider enable Standard Model measurements, nuclear parton density constraints via jets, and beyond-Standard-Model searches.

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

The paper reviews photon physics results at the current LHC and projects their extension to the high-luminosity LHC, a possible high-energy LHC, and the Electron-Ion Collider. It establishes that photon processes support precise Standard Model tests, that jet measurements at the EIC can tighten nuclear parton densities, and that high-luminosity LHC data can extend searches for new physics. A sympathetic reader would care because these projections identify specific experimental channels that could improve knowledge of particle interactions at higher energies and in nuclear environments.

Core claim

Photon physics at the high-luminosity and high-energy LHC phases, together with jet measurements at an Electron-Ion Collider, offers concrete opportunities for Standard Model measurements, improved constraints on nuclear parton densities, and searches for physics beyond the Standard Model.

What carries the argument

Photon-induced processes and associated jet production in high-energy collisions

If this is right

  • Photon channels at the high-luminosity LHC will yield higher-precision Standard Model measurements than current data.
  • Jet production at the Electron-Ion Collider will supply new constraints on nuclear parton densities.
  • Beyond-Standard-Model searches in photon final states will reach higher sensitivity in the high-luminosity LHC phase.

Where Pith is reading between the lines

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

  • Deviations from Standard Model predictions in these channels could point to new physics contributions not yet included in models.
  • The photon-based constraints on parton densities could be combined with other observables to produce more stable global fits.

Load-bearing premise

The planned luminosities, energies, and detector capabilities at the high-luminosity LHC, high-energy LHC, and Electron-Ion Collider will be realized.

What would settle it

If the delivered luminosities fall short of projections or the jet measurements fail to produce tighter nuclear parton density constraints, the outlined measurement opportunities would not materialize.

Figures

Figures reproduced from arXiv: 1906.09280 by M. Klasen.

Figure 1
Figure 1. Figure 1: Relative azimuthal angle distributions of jets and photons in pp (open circles) and pPb (full [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 80
Figure 80. Figure 80: Photo-nuclear dijet cross sections in ultra-peripheral [PITH_FULL_IMAGE:figures/full_fig_p003_80.png] view at source ↗
Figure 59
Figure 59. Figure 59: Acoplanarity (↵, top) and lepton energy imbalance (A, bottom) as a function of centrality, for dimuon pairs with pair mass above 10 GeV/c 2 , observed in the ATLAS detector. From Ref. [582]. alternate explanation could involve the leptons bending in the magnetic field from the QGP. If a QGP is electrically conducting, then it may acquire an induced magnetic field from the short-lived magnetic fields carri… view at source ↗
Figure 79
Figure 79. Figure 79: Pseudodata projections for the nuclear suppression factor by ALICE [1] and CMS measured with Fi4PddjifhlifbALICE d CMS d ih [PITH_FULL_IMAGE:figures/full_fig_p005_79.png] view at source ↗
Figure 5
Figure 5. Figure 5: Top left: pT distribution of inclusive jets in DIS for different EIC designs. Top right: K factors as a function of pT at NLO and aNNLO. Bottom left: Q2 evolution as predicted by nCTEQ15 and EPPS16. Bottom right: Nuclear PDF uncertainty bands as a function of the reconstructed parton momentum fraction in the lead nucleus 22) . Similar distributions are shown in [PITH_FULL_IMAGE:figures/full_fig_p006_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Top left: Average pT distribution of dijets in photoproduction for different EIC designs. Top right: Ratios of different nuclear over free proton cross sections as a function of pT . Bottom left: Ratios of lead and carbon over free proton cross sections as a function of the reconstructed parton momentum fraction in the nucleus. Bottom right: Nuclear PDF uncertainty bands as a function of the reconstructed … view at source ↗
Figure 3.3
Figure 3.3. Figure 3.3: 4: Expected upper limits at 95% C.L. on the production cross section of ￾ as a function of ￾0 mass in (left) mono-photon final state and (right) VBF+Emiss T final state. Results are shown for an integrated luminosity of 3 ab￾1 . The red line shows the theoretical cross section. The reinterpretation of the mono-photon analysis in the WIMP triplet model uses full simulated MC signal samples and performs a … view at source ↗
Figure 103
Figure 103. Figure 103: Compilation of exclusion limits obtained by different experiments (see text). In light grey, the high energy as well as their role in searches for DMcurrently our clearest hint of physics beyon [PITH_FULL_IMAGE:figures/full_fig_p009_103.png] view at source ↗
read the original abstract

We review current results on physics with photons at the LHC and discuss realistic perspectives of photon physics at future colliders. In particular, we focus on Standard Model (SM) measurements with photons at the upcoming high-luminosity and a possible high-energy LHC as well as jet measurements at an Electron-Ion Collider (EIC) to be constructed either at BNL or at JLAB and their potential to constrain nuclear parton densities. We also discuss future searches for physics beyond the SM with photons in the high-luminosity phase of the LHC.

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

0 major / 2 minor

Summary. The manuscript reviews existing LHC results on photon physics and outlines perspectives for Standard Model measurements with photons at the HL-LHC and HE-LHC, jet-based constraints on nuclear parton densities at a future EIC, and BSM searches with photons in the HL-LHC era, all conditioned on standard luminosity, energy, and detector projections.

Significance. As a literature review that faithfully summarizes cited LHC photon results and maps them onto community-standard collider projections, the work provides a compact reference for experimental planning. Its value lies in consolidating opportunities across three distinct future facilities without introducing new calculations or fitted parameters.

minor comments (2)
  1. [Abstract] Abstract: the phrase 'realistic perspectives' is used without an explicit statement of which luminosity or energy scenarios are adopted as baseline; a single sentence listing the reference projections would improve clarity.
  2. The manuscript would benefit from a short table in the introduction that cross-references the collider scenarios (HL-LHC, HE-LHC, EIC) with the physics topics discussed in each subsequent section.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive review and the recommendation to accept the manuscript. The assessment accurately captures the scope of the work as a literature review consolidating LHC photon results and perspectives for HL-LHC, HE-LHC, and EIC.

Circularity Check

0 steps flagged

No significant circularity; review paper with no derivations

full rationale

This is a literature review summarizing existing LHC photon results and outlining conditional perspectives at HL-LHC, HE-LHC, and EIC based on standard luminosity/energy/detector projections from the community. No new equations, fits, predictions, or derivations are advanced that could reduce to fitted parameters or self-referential content. All claims cite external literature and remain falsifiable against independent experimental outcomes.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

As a review paper, no new free parameters, axioms, or invented entities are introduced by the authors.

pith-pipeline@v0.9.0 · 5608 in / 1063 out tokens · 24959 ms · 2026-05-25T18:39:39.814635+00:00 · methodology

discussion (0)

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Reference graph

Works this paper leans on

29 extracted references · 29 canonical work pages · 3 internal anchors

  1. [1]

    Physics at the CLIC Multi-TeV Linear Collider

    B. Badelek et al. [ECFA/DESY Photon Collider Working Group], Int. J. Mod. Phys. A 19 (2004) 5097; E. Accomando et al. [CLIC Physics Working Group], hep-ph/0412251

    work page internal anchor Pith review Pith/arXiv arXiv 2004

  2. [2]

    Berge, M

    S. Berge, M. Klasen and Y. Umeda, Phys. Rev. D 63 (2001) 035003; S. Berge and M. Klasen, Phys. Rev. D 66 (2002) 115014; S. Berge and M. Klasen, Eur. Phys. J. C 30 (2003) 123

    work page 2001

  3. [3]

    Aad et al

    G. Aad et al. [ATLAS Collaboration], Phys. Lett. B 716 (2012) 1; S. Chatrchyan et al. [CMS Collaboration], Phys. Lett. B 716 (2012) 30

    work page 2012

  4. [4]

    Klasen, C

    M. Klasen, C. Klein-B¨ osing, F. K¨ onig and J. P. Wessels, JHEP1310 (2013) 119

    work page 2013

  5. [5]

    Aaboud et al

    M. Aaboud et al. [ATLAS Collaboration], Nature Phys. 13 (2017) 852; A. M. Sirunyan et al. [CMS Collaboration], arXiv:1810.04602 [hep-ex]

    work page arXiv 2017

  6. [6]

    Masson [ALICE Collaboration], N

    E. Masson [ALICE Collaboration], N. Saoulidou [on behalf of the ATLAS and CMS Collaborations], talks at this conference

    work page

  7. [7]

    Cieri, M

    L. Cieri, M. H¨ ofer, F. Siegert, talks at this conference

    work page

  8. [8]

    T. Jezo, M. Klasen, F. K¨ onig, JHEP 1611 (2016) 033; M. Klasen, C. Klein-B¨ osing, H. Poppenborg, JHEP 1803 (2018) 081

    work page 2016

  9. [9]

    CMS Collaboration, CMS-PAS-HIN-13-006

    work page

  10. [10]

    Azzi et al., Standard Model Physics at the HL-LHC and HE-LHC , arXiv:1902.04070 [hep-ph]

    P. Azzi et al., Standard Model Physics at the HL-LHC and HE-LHC , arXiv:1902.04070 [hep-ph]

    work page arXiv 1902

  11. [11]

    ATLAS Collaboration, Photo-nuclear dijet production in ultra-peripheral Pb+Pb collisions , ATLAS- CONF-2017-011

    work page 2017

  12. [12]

    Inclusive dijet photoproduction in ultraperipheral heavy-ion collisions at the CERN LHC in next-to-leading order QCD

    V. Guzey and M. Klasen, Phys. Rev. C (in press), arXiv:1811.10236 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv

  13. [13]

    Guzey and M

    V. Guzey and M. Klasen, Eur. Phys. J. C 79 (2019) 396

    work page 2019

  14. [14]

    Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams

    Z. Citron et al. , Future physics opportunities for high-density QCD at the LHC with heavy-ion and proton beams, arXiv:1812.06772 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv

  15. [15]

    Aaboud et al

    M. Aaboud et al. [ATLAS Collaboration], Phys. Rev. Lett. 121 (2018) 212301

    work page 2018

  16. [16]

    Kapusta, talk at this conference

    F. Kapusta, talk at this conference

    work page

  17. [17]

    Guzey and M

    V. Guzey and M. Klasen, JHEP 1604 (2016) 158

    work page 2016

  18. [18]

    Broz [ALICE], talk at this conference

    M. Broz [ALICE], talk at this conference. See also I. Babiarz, V. Goncalvez, V. Khoze and A. Luszczak, talks at this conference

    work page

  19. [19]

    Guzey, E

    V. Guzey, E. Kryshen, M. Strikman and M. Zhalov, Phys. Lett. B 726 (2013) 290

    work page 2013

  20. [20]

    d’Enterria, A

    D. d’Enterria, A. Szczurek, talks at this conference

    work page

  21. [21]

    Aschenauer, talk at this conference

    E. Aschenauer, talk at this conference

    work page

  22. [22]

    Klasen, K

    M. Klasen, K. Kovarik and J. Potthoff, Phys. Rev. D 95 (2017) 094013

    work page 2017

  23. [23]

    Klasen and K

    M. Klasen and K. Kovarik, Phys. Rev. D 97 (2018) 114013

    work page 2018

  24. [24]

    Luszczak, talk at this conference

    A. Luszczak, talk at this conference

    work page

  25. [25]

    B. Fuks, B. Herrmann and M. Klasen, Phys. Rev. D 86 (2012) 015002; B. Fuks, M. Klasen, S. Schmie- mann and M. Sunder, Eur. Phys. J. C 78 (2018) 209

    work page 2012

  26. [26]

    Klasen, C

    M. Klasen, C. E. Yaguna and J. D. Ruiz-Alvarez, Phys. Rev. D 87 (2013) 075025; M. Klasen, C. E. Yaguna, J. D. Ruiz-Alvarez, D. Restrepo and O. Zapata, JCAP 1304 (2013) 044; S. Esch, M. Klasen, D. R. Lamprea and C. E. Yaguna, Eur. Phys. J. C 78 (2018) 88; S. Esch, M. Klasen and C. E. Yaguna, JHEP 1810 (2018) 055; J. Fiaschi, M. Klasen and S. May, JHEP 1905...

    work page 2013

  27. [27]

    Cid Vidal et al

    X. Cid Vidal et al. , Beyond the Standard Model Physics at the HL-LHC and HE-LHC , arXiv:1812.07831 [hep-ph]

    work page arXiv

  28. [28]

    Harland-Lang, talk at this conference

    L. Harland-Lang, talk at this conference

    work page

  29. [29]

    Gould, talk at this conference

    O. Gould, talk at this conference

    work page