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Photoproduction of diffractive dijets in Pythia 8

by Ilkka Helenius

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Submission summary

Authors (as registered SciPost users): Ilkka Helenius
Submission information
Preprint Link:  (pdf)
Date accepted: 2022-04-07
Date submitted: 2021-07-16 07:40
Submitted by: Helenius, Ilkka
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: Phenomenological


The new framework for the simulations of hard diffractive events in photoproduction within Pythia 8 is presented. The model, originally introduced for proton-proton collisions, applies the dynamical rapidity gap survival probability based on the multiparton interaction model in Pythia. These additional interactions provide a natural explanation for the observed factorization-breaking effects in hard diffraction by filling up the rapidity gaps used to classify the events of diffractive origin. The generated cross sections are well in line with the existing data from HERA experiments and predictions for the future electron-ion collider are presented. In addition, also predictions for ultra-peripheral collisions at the LHC have been calculated where the factorization-breaking effects are found to be more pronounced.

Published as SciPost Phys. Proc. 8, 145 (2022)

Reports on this Submission

Anonymous Report 2 on 2021-8-25 (Invited Report)

  • Cite as: Anonymous, Report on arXiv:2107.07389v1, delivered 2021-08-25, doi: 10.21468/SciPost.Report.3450


Review of the manuscript

Photoproduction of diffractive dijets in Pythia8


Ilkka Helenius

submitted as Proceedings for DIS2021

The authors report on a model for hard diffractive scattering in Pythia, where the rapidity gap survival probability is modeled by the multiple partonic interaction model of Pythia. Results for HERA data are presented that demonstrate a significant effect that has potential to explain the observed factorization breaking in diffractive events. Predictions for the EIC are presented as well as for ultraperipheral collisions at the LHC where a photon from one beam collides with the diffractively dissociating photon. A strong suppression effect is observed in the latter case that should be interesting to be compared to a prospective measurement of the effect.

The contribution is well-written and presents interesting results that have the potential to explain the breaking of factorization in hard diffractive events. I recommend to publish the contribution in SciPost Proceedings.

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Anonymous Report 1 on 2021-8-12 (Invited Report)


1. a clear presentation of the work presented at a conference, with links to the full publication.


The "specific criteria fixed by the guest Editors" are unspecified, but this contribution meets the expectations of proceedings.

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