Abstract
In the framework of the quark-gluon string model we consider the various fluctuation and correlation observables used in the analysis of the multiparticle production in hadronic interactions at high energy. We express these observables through the fundamental string characteristics and analyze their resulting properties: the dependence on the width of observation window(s), the range of the correlation in rapidity, the intensive or strongly intensive behavior. To take into account the influence of a string fusion processes on the string characteristics and on the behavior of the observables. we use the version of string model with a lattice (grid) in the impact parameter plane. In particular we 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 the string fusion and the formation of strings of a few different types takes place in a collision.
Highlights
At present the rapidity correlations between yields of charged particles in high-energy hadronic interactions are intensively studied both theoretically and experimentally
We discuss the influence of the process of string fusion on the string characteristics and on the behavior of the observables
In the framework of the quark-gluon string model we have considered the various fluctuation and correlation observables: the two-particle correlation function, C2(η1, η2), the FB correlation coefficient bFB, the scaled variance of the multiplicity ωn in given rapidity interval δη and the Σ(nF, nB) observable for multiplicities nF and nB 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
Summary
At present the rapidity correlations between yields of charged particles in high-energy hadronic interactions are intensively studied both theoretically and experimentally. For the description of the soft part of a multi-particle production at high energy, which saturates the inelastic cross section and which at present can not be described quantitatively directly by QCD, the quark-gluon string (color flux-tubes) model is usually applied [2, 3] This picture is confirmed by lattice QCD simulations [4]. In this case the cut pomeron corresponds to the formation of two strings, connecting quarks of a target and a projectile (the color reconnection process), which give after their fragmentation two chains of observed hadrons [3, 7] In particular this model is exploited in all present MC event generators: PYTHIA, VENUS, HIJNG, AMPT, EPOS etc., for the description of the soft pat of a strong interaction. We analyze these properties for various observables in the framework of the string model too
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