Long range correlations, event simulation and parton percolation

Pajares, C.

doi:10.1016/j.nuclphysa.2010.06.008

Cited by 17 publications

(10 citation statements)

References 29 publications

(21 reference statements)

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“…These sources are stretched longitudinally between the beam remnants and at certain density in the transverse plane they may start to interact, forming clusters and producing some collective effects. One may mention here the string-fusion and percolation phenomena extensively studied in nucleus-nucleus collisions in [29,30]. In [29] the string percolation phenomenology is compared to the CGC results on effective string or glasma flux tube intrinsic correlations, including the ridge phenomena and long-range forward-backward azimuthal correlations.…”

Section: Introductionmentioning

confidence: 99%

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Azimuthal flows in hadron collisions from quark-gluon string repulsion

Altsybeev

Феофилов

2016

EPJ Web Conf.

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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 longrange 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 report 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.

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Section: Introductionmentioning

confidence: 99%

“…In [29] the string percolation phenomenology is compared to the CGC results on effective string or glasma flux tube intrinsic correlations, including the ridge phenomena and long-range forward-backward azimuthal correlations. Color string percolation model and its similarities with the CGC were discussed in [30].…”

Section: Introductionmentioning

confidence: 99%

Azimuthal flows in hadron collisions from quark-gluon string repulsion

Altsybeev

Феофилов

2016

EPJ Web Conf.

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“…In [15] the string percolation phenomenology was compared to CGC results on effective string or glasma flux tube intrinsic correlations, including the ridge phenomena and long-range forward-backward azimuthal correlations. Color string percolation model and its similarities with the CGC are discussed in [16]. Fourier harmonics decomposition of the two-particle azimuthal correlations in nucleus-nucleus collisions was found to describe various ridge structures observed in the experiment [13,37].…”

Section: Introductionmentioning

confidence: 99%

Constraints on string percolation model from anomalous centrality evolution data in Au-Au collisions at sqrt(s_ NN) = 62 and 200 GeV

Феофилов¹,

Altsybeev²

2015

Proceedings of XXII International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXII)

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Anomalous centrality evolution of two-particle angular correlations observed in Au-Au collisions at √ s NN = 62 and 200 GeV and the onset of ridge structures are considered in the model of interacting quark-gluon strings. We assume that at the given energy of nucleus-nucleus collisions the critical energy density may be reached at the specific centrality. In a string percolation model this might be treated equivalently to a formation of a large cluster of strings characterized by the critical string density, with a size comparable to the whole area of interaction of two nuclei. This hypothesis allows to define some constraints on the string percolation model using data on transitional centralities in Au-Au collisions at these two energies. Results are extrapolated to the LHC energy where high string densities (exceeding the critical value) are confirmed for all classes of centralities in Pb-Pb collisions. Interaction between strings inside large clusters formed in nucleus-nucleus collisions is considered in a simplified Monte Carlo model. This model is applied to the qualitative analysis of the onset of collectivity and the ridge formation in Pb-Pb collisions. It is shown that the approach of the repulsive string-string interaction is capable to explain the appearance of elliptic and triangular flow observed in nucleus-nucleus collisions at RHIC and LHC energies.

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“…Recently, FB correlations have been studied extensively with different model simulations, particularly the Color Glass Condensate (CGC) [20] model and the Color String Percolation model (CSPM) [24]. The CGC provides a QCD based description and predicts the growth of LRC with collision centrality.…”

Section: Introductionmentioning

confidence: 99%

Method for the analysis of forward-backward multiplicity correlations in heavy-ion collisions

Tarnowsky

Nayak

et al. 2013

Phys. Rev. C

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In heavy-ion (A-A) collisions, the correlations among the particles produced across wide range in rapidity, probe the early stages of the reaction. The analyses of forward-backward multiplicity correlations in these collisions are complicated by several effects, which are absent or minimized in hadron-hadron collisions. This includes effects, such as the centrality selection in the A-A collisions, which interfere with the measurement of the dynamical correlations. A method, which takes into account the fluctuations in centrality selection, has been utilized to determine the forward-backward correlation strength bcorr in A-A collisions. This method has been validated by using the HIJING event generator in case of Au-Au collisions at √ sNN = 200 GeV and Pb-Pb collisions at √ sNN = 2.76 TeV. It is shown that the effect of impact parameter fluctuations is to be considered properly in order to obtain meaningful results.

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Long range correlations, event simulation and parton percolation

Cited by 17 publications

References 29 publications

Azimuthal flows in hadron collisions from quark-gluon string repulsion

Azimuthal flows in hadron collisions from quark-gluon string repulsion

Constraints on string percolation model from anomalous centrality evolution data in Au-Au collisions at sqrt(s_ NN) = 62 and 200 GeV

Method for the analysis of forward-backward multiplicity correlations in heavy-ion collisions

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