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Cracking hadron and nuclear collisions open with ropes and string shoving in PYTHIA8

by Smita Chakraborty

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Submission summary

Authors (as Contributors): Smita Chakraborty
Submission information
Arxiv Link: (pdf)
Date submitted: 2021-10-25 11:34
Submitted by: Chakraborty, Smita
Submitted to: SciPost Physics Proceedings
Proceedings issue: 50th International Symposium on Multiparticle Dynamics (ISMD2021)
Ontological classification
Academic field: Physics
  • High-Energy Physics - Theory
  • High-Energy Physics - Phenomenology
Approaches: Theoretical, Phenomenological


Enhancement in strangeness yields in heavy-ion collisions is regarded as one of the attributes of the Quark-Gluon Plasma (QGP) along with jet quenching and final-state collectivity. To reproduce these effects in the MC implementation of the Lund string model in \pythia, the inclusion of non-perturbative mechanisms like string shoving and rope hadronization is crucial. In this proceeding, we discuss our latest implementation of these mechanisms and the preliminary results for the strangeness enhancement in high-multiplicity p-p, p-Pb and Xe-Xe. We conclude with remarks on the ongoing development of the model.

Current status:
Has been resubmitted

Submission & Refereeing History

Resubmission 2109.12359v2 on 15 February 2022

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Submission 2109.12359v1 on 25 October 2021

Reports on this Submission

Anonymous Report 1 on 2022-1-28 (Invited Report)

  • Cite as: Anonymous, Report on arXiv:2109.12359v1, delivered 2022-01-28, doi: 10.21468/SciPost.Report.4265


An excellent explanation of the background, and of the new developments.


Nothing to exclude from proceedings publication.

The role of the novel parallel-frame development (which displays as the ropes -> ropes+shoving?) isn't made so clear, with the main effect being the addition of ropes to Pythia default.

There is some lack of clarity about the extent to which strangeness production is enhanced, vs. baryon production. Maybe this can be disambiguated more in future work.

Figs 3 and 4 don't seem to clearly define the x-axis... I am not sure what it is, and hence what the shoving is scaling with! Some event energy-scale variable, e.g. sumET?


Very good proceedings write-up. I am happy to publish as is, but if the authors want to update with the Fig 3 and 4 x-axis clarified (or point at the explanation I missed) that would be a useful improvement.

  • validity: high
  • significance: good
  • originality: high
  • clarity: high
  • formatting: excellent
  • grammar: excellent

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