Chemical factors in canonical statistical models for relativistic heavy ion collisions

Keränen, A.; Becattini, F.

doi:10.1103/physrevc.65.044901

Cited by 29 publications

(6 citation statements)

References 24 publications

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“…However, with a good approximation, B and Q can be treated grand canonically even in high energy pp collisions. This results in a slight overestimate of the canonical effect [5].…”

Section: Canonical Strangeness Suppressionmentioning

confidence: 99%

Canonical aspects of strangeness enhancement

Tounsi

Mischke²,

Redlich

2003

Nuclear Physics A

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Strangeness enhancement (SE) in heavy ion collisions can be understood in the statistical model on the basis of canonical suppression. In this formulation,SE is a consequence of the transition from canonical to the asymptotic grand canonical limit and is predicted to be a decreasing function of collision energy. This model predictions are consistent with the recent NA49 data on $\Lambda$ enhancement at $p_{lab}=40, 80, 158$ GeV.Comment: 4 pages, 4 figures. To appear in the proceedings of Quark Matter 2002 (Nantes, France

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“…However, with a good approximation, B and Q can be treated grand canonically even in high energy pp collisions. This results in a slight overestimate of the canonical effect [5].…”

Section: Canonical Strangeness Suppressionmentioning

confidence: 99%

Canonical aspects of strangeness enhancement

Tounsi

Mischke²,

Redlich

2003

Nuclear Physics A

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“…[27]. More recently, it has been pointed out [28,29] that in the canonical ensemble (CE) with exact conservation of charges, scaled variance of the multiplicity distribution of any particle does not converge to the corresponding grand canonical (GCE) value even in the thermodynamic limit, unlike the mean [30,31].…”

Section: Model Descriptionmentioning

confidence: 99%

Fluctuations and clustering of multiplicity in collisions of relativistic ions

Rybczyński

Włodarczyk

2020

Eur. Phys. J. A

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We discuss the recently measured event-by-event multiplicity fluctuations in relativistic heavy-ion collisions. It is shown that the observed non-monotonic behaviour of the scaled variance of multiplicity distribution as a function of collision centrality (such effect is not observed in a widely used string-hadronic models of nuclear collisions) can be fully explained by the correlations between produced particles promoting cluster formation. We define a cluster as a quasi-neutral gas of charged and neutral particles which exhibits collective behaviour. The characteristic space scale of this shielding is the Debye length. Multiplicity distribution in a cluster is given by Negative Binomial distribution while the rest (reservoir), treated as a superposition of elementary collisions, is described by Binomial distribution. The ability to generate spatial structures (cluster phase) sign the propensity to self-organize of hadronic matter.

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“…For the case when both, quantum statistical effects are neglected for baryons and when there are no particles in the list with |B j | > 1, the integration over φ B is performed analytically, using the method of Ref. [75]. This allows to significantly speed up the calculations.…”

Section: Full Canonical Ensemblementioning

confidence: 99%

Thermal-FIST: A package for heavy-ion collisions and hadronic equation of state

Vovchenko

Stoecker

2019

Computer Physics Communications

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Thermal-FIST * * is a C++ package designed for convenient general-purpose physics analysis within the family of hadron resonance gas (HRG) models. This mainly includes the statistical analysis of particle production in heavyion collisions and the phenomenology of hadronic equation of state. Notable features include fluctuations and correlations of conserved charges, effects of probabilistic decay, chemical non-equilibrium, and inclusion of van der Waals hadronic interactions. Calculations are possible within the grand canonical ensemble, the canonical ensemble, as well as in mixed-canonical ensembles combining the canonical treatment of certain conserved charges with the grand-canonical treatment of other conserved charges. The package contains a fast thermal event generator, which generates particle yields in accordance with the HRG chemistry, and particle momenta based on the Blast Wave model. A distinct feature of this package is the presence of the graphical user interface frontend -QtThermalFIST -which is designed for fast and convenient general-purpose HRG model applications. Program summaryProgram Title: Thermal-FIST, version 1.2 Licensing provisions: GPLv30 Programming language: C++ Computer: any with a C++ compiler and, optionally, the Qt5 framework for the GUI frontend Operating system: cross-platform, tested on Linux Ubuntu 16.04, 18.04; Mac OS X Yosemite, Microsoft Windows 10; Android 8, 9 External routines: Eigen template library for the linear algebra routines [1], MI-NUIT2 package from CERN ROOT [2], Mersenne Twister random number generator [3], Qt5 framework [4] (for the GUI only), QCustomPlot Qt widget [5] (for the GUI only) Nature of problem:The HRG model and its various modifications constitute a common framework used for modeling of the hadronic equation of state and particle production in heavy-ion collisions. Even the simplest versions of the HRG model require careful considerations of the many details, including the resonance decay feed-down, implementation of charge conservation constraints relevant for heavy-ion collisions, chemical non-equilibrium effects. A notable extra effort is required in order to treat the fluctuations and correlations of various charges charges, which presently are being extensively studied in the heavy-ion collision experiments and lattice QCD calculations. The inclusion of hadronic interactions, modeled by an excludedvolume (EV) or a van der Waals (vdW) type framework, additionally requires a numerical solution to a system of many transcendental equations. Solution method:The Thermal-FIST package contains a class-based library which calculates relevant HRG observables for a specified setup. The setup includes a particle list, usually to be supplied with an external file, an HRG model specification (statistical ensemble, van der Waals interaction parameters, etc.), a set of thermal parameters, and conservation laws constraints. Whenever necessary, the systems of transcendental equations are solved numerically with the Broyden's method. The package includes a fitt...

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Chemical factors in canonical statistical models for relativistic heavy ion collisions

Cited by 29 publications

References 24 publications

Canonical aspects of strangeness enhancement

Canonical aspects of strangeness enhancement

Fluctuations and clustering of multiplicity in collisions of relativistic ions

Thermal-FIST: A package for heavy-ion collisions and hadronic equation of state

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