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Intermittency analysis of charged hadrons generated in Pb-Pb collisions at $\sqrt{s_{NN}}$= 2.76 TeV and 5.02 TeV using PYTHIA8/Angantyr

by Salman Khurshid Malik, Ramni Gupta

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Submission summary

Authors (as registered SciPost users): Salman Khurshid Malik
Submission information
Preprint Link: https://arxiv.org/abs/2210.07942v1  (pdf)
Date submitted: Oct. 17, 2022, 5:17 a.m.
Submitted by: Salman Khurshid Malik
Submitted to: SciPost Physics Proceedings
Proceedings issue: 51st International Symposium on Multiparticle Dynamics (ISMD2022)
Ontological classification
Academic field: Physics
Specialties:
  • High-Energy Physics - Phenomenology

Abstract

Local density fluctuations are expected to scale as a universal power-law when the system approaches critical point. Such power-law fluctuations are studied within the framework of intermittency through the measurement of normalized factorial moments in ($\eta$, $\phi$) phase space. Observations and results from the intermittency analysis performed for charged particles in Pb-Pb collisions using PYTHIA8/Angantyr at 2.76 TeV and 5.02 TeV are reported. We observe no scaling behaviour in the particle generation for any of the centrality studied in narrow p$_T$ bins. The scaling exponent $\nu$ shows no dependence on the centrality ranges.

Current status:
Has been resubmitted

Reports on this Submission

Report #1 by Anonymous (Referee 1) on 2022-11-16 (Invited Report)

  • Cite as: Anonymous, Report on arXiv:2210.07942v1, delivered 2022-11-16, doi: 10.21468/SciPost.Report.6138

Strengths

1) The paper is easy to read. It manages to describe the essential features of the work using only 4 compact formulas without overwhelming the reader with a lot of details.

Report

The authors study local density fluctuations in Pythia/Angantyr model by using normalized factorial moments. The authors do not see signs of scale invariant fluctuations. The authors also extract scaling exponent, which has been predicted for a second order phase transition using Ginzburg-Landau theory. The extracted exponent does not agree with the value predicted for the phase transition. This is an expected result, since Pythia/Angantyr does not assume formation of thermalized plasma. Thus there is no a priori reason to expect to see signs of phase transition in Pythia/Angantyr. The significance of the result is that a model without a phase transition can not reproduce the scaling exponent which is expected of a phase transition. Thus increasing confidence in this observable. I recommend publication.

Requested changes

While reading, I have noticed a few typos etc. that the authors may want to fix for the final version:.
Typos:
-"It’s value is predicted to be"-> Its value is predicted to be
-generaton -> generation
-crtitical -> critical
-"different centrality bins and >> 1.304" I think you should use the latex command \gg here instead of ">>".

Figures:
-Fig. 3 the legend for (ALICE Pb-Pb...) seems to extend beyond the boundaries of the figure.

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

Author:  Salman Malik  on 2022-11-29  [id 3086]

(in reply to Report 1 on 2022-11-16)

Thank you so much for the comments. I have resubmitted with the mentioned changes.

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