Abstract

This paper presents a comparative study of forward-backward correlations and multiplicity fluctuations in experimental data and in HIJING Monte Carlo simulations of Pb–Pb collisions at s NN = 2 . 76 TeV. The analysis focuses on two observables: the forward-backward correlation coefficient b c o r r n - n and the strongly intensive quantity Σ . Results are discussed in the context of the dependence on centrality estimator and influence of event-by-event fluctuations of the geometry of the Pb–Pb collisions on the measured quantities.

Highlights

  • Over the years many methods have been developed to study correlations and fluctuations in heavy-ion collisions

  • This paper reports on a comparative study of forward-backward correlations and multiplicity fluctuations in experimental data and Monte Carlo (MC) HIJING simulations of Pb–Pb collisions at sNN = 2.76 TeV

  • The paper derives the expression (Equation (3)) for the forward-backward correlation coefficient in the Wounded Nucleon Model [4], with particle emission from a single nucleon implemented according to the negative binomial multiplicity distribution (NBD): n−n bcorr

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Summary

Introduction

Over the years many methods have been developed to study correlations and fluctuations in heavy-ion collisions. An example of an independent source model is the Wounded Nucleon Model [4].) of multi-particle production, the Σ observable does not depend on the number of sources nor on their event-by-event fluctuations. It carries direct information on characteristics of the single source distribution. This paper reports on a comparative study of forward-backward correlations and multiplicity fluctuations in experimental data and Monte Carlo (MC) HIJING simulations of Pb–Pb collisions at sNN = 2.76 TeV. The analysis focuses on two observables: the forward-backward correlation n−n and the strongly intensive quantity Σ

Analysis Details
Forward-Backward Correlation Coefficient bcorr
Strongly Intensive Quantity Σ
Conclusions

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