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Ultraperipheral collisions and low-x physics

by Tuomas Lappi

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Submission summary

Authors (as registered SciPost users): Tuomas Lappi
Submission information
Preprint Link: scipost_202107_00034v1  (pdf)
Date accepted: 2022-03-21
Date submitted: 2021-07-20 17:01
Submitted by: Lappi, Tuomas
Submitted to: SciPost Physics Proceedings
Proceedings issue: 28th Annual Workshop on Deep-Inelastic Scattering (DIS) and Related Subjects (DIS2021)
Ontological classification
Academic field: Physics
  • High-Energy Physics - Phenomenology
Approach: Theoretical


Ultraperipheral collisions at the LHC and RHIC offer the highest currently available energy for photon-nucleon and photon-nucleus collisions. Thus they are a valuable tool for studying the gluonic structure of hadrons and nuclei at small x. We discuss recent theoretical work towards understanding such exclusive processes at NLO accuracy in QCD perturbation theory. These theoretical advances are also immediately relevant for understanding the physics of deep inelastic scattering at small x. We also discuss experimental results in ultraperipheral collisions, most prominently for exclusive vector meson production.

Published as SciPost Phys. Proc. 8, 003 (2022)

Submission & Refereeing History

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Submission scipost_202107_00034v1 on 20 July 2021

Reports on this Submission

Anonymous Report 1 on 2022-3-14 (Invited Report)

  • Cite as: Anonymous, Report on arXiv:scipost_202107_00034v1, delivered 2022-03-14, doi: 10.21468/SciPost.Report.4679


Recent theoretical work towards understanding gluonic structure of hadrons and nuclei at small x is discussed. The discussion is very much related to EIC and photon nucleon interactions. It has been shown that the LHC and RHIC have a growing and versatile program of photon-mediated ultraperipheral collisions that addresses the same physics topics as EIC and thus complementary measurement cam be made prior to EIC vis UPC in vector meson channels. This is very well written and carry strong direction to UPC measurements for small x physics. I would recommend it for publication.

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