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Jet modifications from colour rope formation in dense systems of non-parallel strings

by Christian Bierlich, Smita Chakraborty, Gösta Gustafson, Leif Lönnblad

This Submission thread is now published as

Submission summary

Authors (as registered SciPost users): Christian Bierlich · Smita Chakraborty · Leif Lönnblad
Submission information
Preprint Link:  (pdf)
Date accepted: 2022-06-23
Date submitted: 2022-06-01 15:33
Submitted by: Chakraborty, Smita
Submitted to: SciPost Physics Core
Ontological classification
Academic field: Physics
  • High-Energy Physics - Theory
  • High-Energy Physics - Phenomenology
Approaches: Theoretical, Phenomenological


We revisit our rope model for string fragmentation that has been shown to give a reasonable description of strangeness and baryon enhancement in high-multiplicity pp events at the LHC. A key feature of the model is that the enhancement is driven by the increased string tension due to strings overlapping in dense systems. By introducing an improved space-time picture for the overlap between fragmenting strings, where also non-parallel strings are properly taken into account, we are now able to investigate the enhancement both in jets and in the underlying event in a consistent way.

Author comments upon resubmission

First, we would like to thank the referee for their helpful comments and thorough reading of the manuscript. We also apologise for the several typos in the manuscript.

We have corrected the typos and included the suggested reference to Herwig's baryonic colour reconnection in the introduction section. The discussion on string width R has been expanded with references to lattice calculations for the same in section 2.2.1.

We also thank Dr Kar for the comment. The changes suggested are useful and after our thorough reviewing, we have incorporated some of those changes into the manuscript. Section 4.2 is now renamed to "...reconstructed Z events", footnote 3 has been modified to make it clearer. However, the sqrt(2)R_j used in section 4.3 is done to get a broader region in the UE correction, and the ghost area is not of relevance to high-density collisions (such as the cases in high luminosity p-p and nuclear collisions).

The suggested Rivet analyses for section 4.2 are useful, however, in this case, we focussed on including the minimum number of plots to show that the general properties of p-p collisions are not driven haywire by our new model. Since the results presented in section 4.3 are the key results of this paper, the plots in figure 3 are suitable control plots to show that at pT ranges of 10-20 GeV, our rope hadronization model performs well.

We have also considered Dr Kar's last request for track-based observables for low-mu 13.6 TeV data in ATLAS, however, it is not clear to the authors what the observable should be used for, hence we do not have any suggestions for that as of now.

List of changes

- correction of typos
- included Herwig's baryonic colour reconnection reference
- discussion of string width R range of values with reference
- correction of footnote 3

Published as SciPost Phys. 13, 023 (2022)

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