Lévy HBT Results at NA61/SHINE

Pórfy, B.

doi:10.3390/universe5060154

Cited by 7 publications

(15 citation statements)

References 17 publications

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“…in [15]. It was recently shown by different experiments that for pions this pair-source exhibits a power-law behavior, and can be described with a Lévy-stable distribution [15,16]. In case of spherical symmetry, the symmetric, centered stable distribution is defined as where the temporal dimension is removed from the dependence, made possible by the massshell condition, as detailed in Ref.…”

Section: The Two-particle Source Functionmentioning

confidence: 99%

“…Source imaging studies [13,14] on the other hand suggest that the two-particle source function of pions has a long-range component, obeying a power-law behavior. It was also shown recently by various experimental measurements, that a generalization of the Gaussian source shape, the Lévy distribution can provide a much more suitable description of the observed sources [15,16]. These kind of source shapes arise in many different scenarios [17] such as anomalous diffusion [18], jet fragmentation [19], critical behavior [20], or resonance decays.…”

Section: Introductionmentioning

confidence: 99%

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Event-by-event investigation of the two-particle source function in heavy-ion collisions with EPOS

Kincses,

Stefaniak,

Csanád

2022

Preprint

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Exploring the shape of the pair-source function for particles such as pions or kaons has been an important goal of heavy-ion physics, and substantial effort has been made in order to understand the underlying physics behind the experimental observations of non-Gaussian behavior. In experiments, since no direct measurement of the source function is possible, quantum-statistical momentum correlations are utilized to gain information about the space-time geometry of the particle emitting source. Event generators, such as EPOS, however, provide direct access to the freeze-out coordinates of final state particles, and thus the source function can be constructed and investigated. The EPOS model is a sophisticated hybrid model where the initial stage evolution of the system is governed by Parton-Based Gribov-Regge theory, and subsequently a hydrodynamic evolution is utilized, followed by hadronization and hadron dynamics. EPOS has already proven to be successful in describing several different experimental observations for systems characterized by baryon chemical potential close to zero, but so far the source shape has not been explored in detail. In this paper we discuss an event-by-event analysis of the two-particle source function in √ s NN = 200 GeV Au+Au collisions generated by the EPOS model. We find that when utilizing all stages of the model, Lévy-shaped distributions (unlike Gaussian distributions) provide a good description of the source shape in the individual events. Hence it is clear that it is not the event averaging that creates the non-Gaussian features in the pair distributions.Based on this observation, we determine Lévy-parameters of the source as a function of event centrality and particle momentum.

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Section: The Two-particle Source Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Event-by-event investigation of the two-particle source function in heavy-ion collisions with EPOS

Kincses,

Stefaniak,

Csanád

2022

Preprint

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“…Recent experimental findings suggest that in heavy-ion physics Lévy-stable distributions may play the role of the source distribution. 7,25,26 The definition of the symmetric, centered stable distribution in case of spherical symmetry is the following: 4…”

Section: The Two-particle Sourcementioning

confidence: 99%

Investigating the pion source function in heavy-ion collisions with the EPOS model

Stefaniak

Kincses

2020

Photonics Applications in Astronomy, Communications, Industry, and High Energy Physics Experiments 2020

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By measuring the momentum correlations of pions created in heavy-ion collisions we can gain information about the space-time geometry of the particle emitting source. Recent experimental results from multiple different collaborations demonstrated that to properly describe the shape of the measured correlation functions, one needs to go beyond the Gaussian approximation. Some studies suggest that the Lévy distribution could provide a good description of the source. While there are already many experimental results, there is very little input from the phenomenology side in explanation of the observed non-Gaussian source shapes. The EPOS model is a sophisticated hybrid model where the evolution of the newly-created system is governed by Parton-Based Gribov-Regge theory. It has already proved to be successful in describing many different experimental observations for the systems characterized by baryon chemical potential close to zero, but so far the source shape has not been explored in detail. In this paper we discuss studies of the pion emitting source based on the theoretical approach of the EPOS model.

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“…In general anomalous diffusion leads to α < 2. The presented performance results were obtained in Be+Be collisions at 150A GeV/c [18]. Performance results are shown for centrality higher than 20% based on the Projectile Spectator Detector.…”

Section: Bose-einstein Correlationsmentioning

confidence: 99%

“…The repulsion of the same charged particles was taken into account via Coulomb correction (for details see Ref. [18]). The fitted function has three important parameters: R, λ and α.…”

Section: Bose-einstein Correlationsmentioning

confidence: 99%