Abstract
Color flux tubes (quark-gluon strings), formed at early stages of hadron-hadron collisions, may overlap in case of sufficiently high densities and interact, producing long-range azimuthal correlations. In the hypothesis of repulsive interaction, each string may acquire, before the hadronization, the additional transverse boost, which is an efficient sum of all accounted string-string interactions. This modifies transverse momenta to the particles formed in string decay, leading to modification of event-wise observables, like azimuthal asymmetry of two-particle correlations, over a wide range of rapidity. In this article we discuss results of Monte Carlo model with string repulsion, where efficient string-string interaction radius is introduced. We show that the effect of string repulsion can be the main dynamic origin of the elliptic flow and of the higher harmonics, which are reflected in the complicated structures observed in two-particle long-range correlation topology in nucleus-nucleus collisions at RHIC and at LHC.
Highlights
The very first proposals for studies of azimuthal and long-range correlations were formulated in [1]
The azimuthal anisotropy in two-particle correlation functions observed at RHIC and LHC is characterized by the Fourier flow coefficients [3, 4]: vn = cos[n(φ − Ψn)]
It is the last factor that might be responsible for the azimuthal anisotropy effects of transport of particles through the given nonuniform medium. Among these approaches are the recent studies [31,32,33] of the azimuthal anisotropy of two-particle correlation functions, observed in hadron collisions, that are based on the assumption of quark-gluon string formation at the very early stages of hadron collisions and further interaction of particles produced by these sources with the strong colour fields inside string clusters
Summary
The very first proposals for studies of azimuthal and long-range correlations were formulated in [1]. Among these approaches are the recent studies [31,32,33] of the azimuthal anisotropy of two-particle correlation functions, observed in hadron collisions, that are based on the assumption of quark-gluon string formation at the very early stages of hadron collisions and further interaction of particles produced by these sources with the strong colour fields inside string clusters It is shown by the direct Monte Carlo simulations [33] that the elliptic flow can be successfully described in the color string picture with fusion and percolation, provided the anisotropy of particle emission from the fused string is taken into account. Discussion and conclusions are given in the last two sections
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