Abstract
We calculate the strongly intensive observables for multiplicities in two rapidity windows in the model with independent identical strings taking into account the charge sign of particles. We express the observables through the string pair correlation functions describing the correlations between the same and opposite sign particles produced in a string decay. We extract these charge-wise string two-particle correlation functions from the ALICE data on the forward-backward correlations and the balance function. Using them we predict the behavior of the charge-wise strongly intensive observables in the model with independent identical strings. We also show that the observable between multiplicities in two acceptance windows separated in rapidity, which is a strongly intensive in the case with independent identical strings, loses this property, when we take into account string fusion effects and a formation of strings of a few different types takes place in a collision. We predict the changes in the behaviour of this observable with energy and collision centrality, arising due to the string fusion phenomena.
Highlights
It is known that the investigations of long range rapidity correlations give the information about the initial stage of high energy hadronic interactions [1]
To characterize the properties of a single string we introduce the single and double distributions of particles produced from a single string fragmentation and the string two-particle correlation function defined by a standard way: λ(η ) ≡
In the framework of the quark-gluon string model we have considered the Σ(n F, n B ) observable for multiplicities n F and n B in two acceptance windows, δηF and δηB, separated by some rapidity interval ∆η, which usually used in the analysis of the multi-particle production in hadronic interactions at high energy, taking into account the charge sign of particles
Summary
It is known that the investigations of long range rapidity correlations give the information about the initial stage of high energy hadronic interactions [1]. Universe 2019, 5, 15 for the charged particles multiplicities n F and n B in forward and backward rapidity windows, introduced like in [11,12] to suppress the contribution of the "volume" fluctuations in hadronic interactions at high energy (ωn = Dn /hni is a scaled variance). We express this observable through the fundamental characteristics of a string: the multiplicity μ0 per unit of rapidity and the two-particle correlation function Λ(η1 − η2 ), describing the fragmentation of a single string (see Formula (6) below). We will study the properties only of the strongly intensive observable defined by (1), leaving the remaining options for future research
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