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Introduction to the PanScales framework, version 0.1

by Melissa van Beekveld, Mrinal Dasgupta, Basem Kamal El-Menoufi, Silvia Ferrario Ravasio, Keith Hamilton, Jack Helliwell, Alexander Karlberg, Rok Medves, Pier Francesco Monni, Gavin P. Salam, Ludovic Scyboz, Alba Soto-Ontoso, Gregory Soyez, Rob Verheyen

Submission summary

Authors (as registered SciPost users): Alexander Karlberg · Gavin Salam · Ludovic Scyboz · Gregory Soyez · Rob Verheyen · Melissa van Beekveld
Submission information
Preprint Link: scipost_202404_00030v1  (pdf)
Code repository:
Date accepted: 2024-05-20
Date submitted: 2024-04-21 17:34
Submitted by: van Beekveld, Melissa
Submitted to: SciPost Physics Codebases
Ontological classification
Academic field: Physics
  • High-Energy Physics - Phenomenology


In this article, we document version 0.1 of the PanScales code for parton shower simulations. With the help of a few examples, we discuss basic usage of the code, including tests of logarithmic accuracy of parton showers. We expose some of the numerical techniques underlying the logarithmic tests and include a description of how users can implement their own showers within the framework. Some of the simpler logarithmic tests can be performed in a few minutes on a modern laptop. As an early step towards phenomenology, we also outline some aspects of a preliminary interface to Pythia, for access to its hard matrix elements and its hadronisation modules.

Author comments upon resubmission

We thank the referees for their helpful comments. We reply to specific points to the individual referees.

List of changes

- section 1:
* added references to a selection of papers on hadronisation and tuning
- section 2.1:
* addition of outline of directory structure
- section 2.2:
* added reference to new Appendix A, mentioning in particular access to step-by-step event record
- section 2.4:
* added indication that one needs to install the CT14lo set
* added a paragraph at the end of the section, with a discussion of the interplay between hadronisation and logarithmic accuracy
- section 2.5:
* added mention of the use of Catch2 library for unit tests
- section 3.1:
* added discussion of the choice of $\alpha_s$ values for the global event-shape logarithmic accuracy tests
- section 3.1.1:
* (penultimate paragraph) added discussion of the approximate observable that is used as a helper within log-accuracy tests
- section 3.1.3:
* substantial rewrite of this section (on weighted event generation
for $\beta_{ps}\neq \beta_{obs}$), to help make it clearer
- section 3.2:
* updated footnote 9 discussing leading-$N_C$ colour choices in the tests
of non-global logarithms
- Appendix A:
* added new appendix with event record description

Current status:
Accepted in target Journal

Editorial decision: For Journal SciPost Physics Codebases: Publish
(status: Editorial decision fixed and (if required) accepted by authors)

Reports on this Submission

Anonymous Report 3 on 2024-5-10 (Invited Report)


I thanks the authors for their clear response and additional comments in the manuscript in order to clarify all points that have been raised satisfactorily.

I recommend the manuscript for publication in SciPost without any further changes.


Publish (surpasses expectations and criteria for this Journal; among top 10%)

  • validity: -
  • significance: -
  • originality: -
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Anonymous Report 2 on 2024-5-9 (Invited Report)


The authors have addressed my questions satisfactorily, I thus recommend the manuscript for publication in its current state.


Publish (meets expectations and criteria for this Journal)

  • validity: -
  • significance: -
  • originality: -
  • clarity: -
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  • grammar: -

Anonymous Report 1 on 2024-5-4 (Invited Report)


I thank the authors for addressing the referee remarks of the previous submission. I am happy to recommend this paper for publication in this journal.


Publish (easily meets expectations and criteria for this Journal; among top 50%)

  • validity: -
  • significance: -
  • originality: -
  • clarity: -
  • formatting: -
  • grammar: -

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