On description of the correlation between multiplicities in windows separated in azimuth and rapidity

TL;DR

This paper analyzes forward-backward multiplicity correlations in particle collisions, linking them to two-particle correlations and azimuthal flow, highlighting the roles of short-range and long-range contributions within a string-based model.

Contribution

It introduces a comprehensive model incorporating both short-range and long-range effects to describe multiplicity correlations in azimuth and rapidity.

Findings

Correlation coefficient relates to two-particle correlation functions.

Long-range fluctuations significantly influence the correlation structure.

Azimuthal flow induces a ridge structure in two-particle correlations.

Abstract

The forward-backward (FB) multiplicity correlations in two windows separated in rapidity and azimuth are analyzed in the framework of the model with independent identical emitters (strings). Along with the short-range contribution, originating from the correlation between particles produced by a single string, the long-range contribution, originating from the fluctuation in the number of strings, is taken into account. The connection of the FB multiplicity correlation coefficient with the two-particle correlation function and the di-hadron correlation analysis is traced. It's also shown that the direct azimuthal flow leads to the forward ridge structure in the resulting two-particle correlation function.