Charge splitting of directed flow and charge-dependent effects in pion spectra in heavy ion collisions

Rybicki, A.; Szczurek, Antoni; Kłusek-Gawenda, Mariola; Kielbowicz, M. M.

doi:10.48550/arxiv.1502.03689

Cited by 2 publications

(2 citation statements)

References 17 publications

(23 reference statements)

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“…The directed flow of charged pions could be a result of a spectator induced splitting, as it is demonstrated in Refs. [91,92].…”

Section: Discussionmentioning

confidence: 99%

Statistical and Thermodynamical Studies of the Strongly Interacting Matter

Horváth

2016

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In this thesis we discuss three separate analysis of various phenomenological aspects of heavy-ion collisions (HIC). The first one is a possible generalization of the kinetic theory framework for dense systems. We investigate its long-time behaviour and the properties of the equilibrium. The second discussion is about the phenomenological analysis of the azimuthal asymmetry of the particle yields in a HIC, where we link the initial stage geometrical asymmetry to the particle yields and examine the possible organizing mechanisms that could be responsible for such a relation. The third, and also the most thorough part of the thesis is about the relation of the spectral density of quasi-particle states and the macroscopic fluidity measure (η s) and other transport properties of the system. We extensively study the liquid-gas crossover with the help of model spectral functions. The main conclusion is that the relative intensification of the continuum of the scattering states compared to the quasi-particle peak makes the matter more fluent.These different effective models have an important feature in common: the phenomenology in all three cases is rooted in the medium-modification of the microscopic degrees of freedom.

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“…The directed flow of charged pions could be a result of a spectator induced splitting, as it is demonstrated in Refs. [91,92].…”

Section: Discussionmentioning

confidence: 99%

Statistical and Thermodynamical Studies of the Strongly Interacting Matter

Horváth

2016

Preprint

View full text Add to dashboard Cite

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“…The directed flow of charged pions could be a result of a spectator induced splitting, as it is demonstrated in Refs. [37,38]. It seems that dipole-like structures coupled to the initial geometric asymmetry of heavy-ion collisions are quite natural in a wide scale of models concerning the early time evolution of the hot nuclear matter.…”

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confidence: 99%

Elliptic flow due to radiation in heavy-ion collisions

2015

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Abstract.In this paper we demonstrate that radiation patterns could cause flow-like behaviour without any reference to hydrodynamic description. For that purpose we use a statistical ensemble of radiating dipoles, motivated by the investigation of the equivalent photon yield produced by decelerating charges. For the elliptic asymmetry factor, v 2, we find a reasonable agreement with experimental data.Hydrodynamical simulations are widely used to describe the early time evolution of proton-nucleus and heavy-ion collisions, see refs. [1][2][3][4][5][6][7][8][9][10][11] and the references therein. However, the fact that hydrodynamics has a strong predictive power does not imply that it is the only option to explain collective phenomena in such systems. There have been recent efforts to reproduce the flow patterns observed in RHIC and LHC using color scintillating antennas radiating gluons [12,13]. Other authors utilized phenomenological models of color-electric dipoles in order to account for angular correlations in high-energy processes [14][15][16]. It is an ongoing debate though, whether a simple effective model, lacking hydrodynamics, could catch the flow-like behaviour or not. Unfortunately, it is rather complicated to explain the collective properties using microscopical models as a starting point.In this letter, our goal is to demonstrate that the radiation originating from a dipole set-up is, in principle, able to match quantitatively the elliptic asymmetry factor v 2 , measured in heavy-ion experiments. To do so, we discuss the yield of massless particles produced by a decelerating point-like charge. Then we compute the flow coefficient v 2 of a dipole composed of two, parallel displaced counterdecelerating charges. Motivated by the formula in eq. (6), we fit various experimental data. Finally, we conclude our analysis discussing several open issues and their relevance for further, more realistic description. Radiation produced by decelerating sourcesAccording to electrodynamics, an accelerating point charge radiates. One can reinterpret this phenomenon a

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Charge splitting of directed flow and charge-dependent effects in pion spectra in heavy ion collisions

Cited by 2 publications

References 17 publications

Statistical and Thermodynamical Studies of the Strongly Interacting Matter

Statistical and Thermodynamical Studies of the Strongly Interacting Matter

Elliptic flow due to radiation in heavy-ion collisions

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