Particle production and equilibrium properties within a new hadron transport approach for heavy-ion collisions

Weil, Janus; Steinberg, Vinzent; Staudenmaier, Jan; Pang, Long-Gang; Oliinychenko, Dmytro; Mohs, Justin; Kretz, M.; Kehrenberg, T.; Goldschmidt, A.; Bäuchle, Bjørn; Auvinen, Jussi; Attems, Maximilian; Petersen, Hannah

doi:10.1103/physrevc.94.054905

Cited by 246 publications

(298 citation statements)

References 68 publications

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“…We model the hadron gas using the most dominant mesons and baryons in a hot gas close to the QGP phase transition, that is, pions, kaons, nucleons, as well as lambda-and sigma-baryons (for particle properties see Appendix X A). From the particle data group [48], we use all available elastic, isotropic cross sections and complement other theoretically-described resonant cross section from GiBUU [49] and SMASH [50], as shown in Fig. 2.…”

Section: Diffusion Coefficient Matrix Of a Hadronic Gasmentioning

confidence: 99%

Diffusion processes involving multiple conserved charges: A study from kinetic theory and implications to the fluid-dynamical modeling of heavy ion collisions

et al. 2020

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The bulk nuclear matter produced in heavy ion collisions carries a multitude of conserved quantum numbers: electric charge, baryon number, and strangeness. Therefore, the diffusion processes associated to these conserved charges cannot occur independently and must be described in terms of a set of coupled diffusion equations. This physics is implemented by replacing the traditional diffusion coefficients for each conserved charge by a diffusion coefficient matrix, which quantifies the coupling between the conserved quantum numbers. The diagonal coefficients of this matrix are the usual charge diffusion coefficients, while the off-diagonal entries describe the diffusive coupling of the charge currents. In this paper, we show how to calculate this diffusion coefficient matrix from kinetic theory and provide results for a hadron resonance gas and a gas of partons. We further find that the off-diagonal entries can reach similar magnitudes compared to the diagonal entries. In order to provide some insight on the influence that the coupling between the net charge diffusion currents can have on heavy ion observables, we present first results for the diffusive evolution of a hadronic system in a simple (1+1)D-fluid dynamics approach, and study different configurations of the diffusion matrix.

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Section: Diffusion Coefficient Matrix Of a Hadronic Gasmentioning

confidence: 99%

Diffusion processes involving multiple conserved charges: A study from kinetic theory and implications to the fluid-dynamical modeling of heavy ion collisions

et al. 2020

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“…QMD [26][27][28][29], IQMD [30], UrQMD [31,32] etc. or on ii) the mean-field based approaches such as different types of semi-classical (Vlasov)Boltzmann-Uehling-Uhlenbeck ((V)BUU) models realized in terms of different numerical codes known as BUU [33][34][35], AMPT [36], HSD [37], GiBUU [38], SMASH [39] etc., as well as a more advanced approach of the same class, based on the offshell Kadanoff-Baym (KB) equations (in first order gradient expansion) -the Parton-Hadron-String Dynamics (PHSD) approach [40]. There are also models based on a cascade type propagation as the Quark-Gluon String Model (QGSM) [41].…”

Section: Introductionmentioning

confidence: 99%

Parton-hadron-quantum-molecular dynamics: A novel microscopic n -body transport approach for heavy-ion collisions, dynamical cluster formation, and hypernuclei production

et al. 2020

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We present the novel microscopic n-body dynamical transport approach PHQMD (Parton-Hadron-Quantum-Molecular-Dynamics) for the description of particle production and cluster formation in heavy-ion reactions at relativistic energies. The PHQMD extends the established PHSD (Parton-Hadron-String-Dynamics) transport approach by replacing the mean-field by density dependent two body interactions in a similar way as in the Quantum Molecular Dynamics (QMD) models. This allows for the calculation of the time evolution of the n-body Wigner density and therefore for a dynamical description of cluster and hypernuclei formation. The clusters are identified with the MST (Minimum Spanning Tree) or the SACA (Simulated Annealing Cluster Algorithm) algorithm which -by regrouping the nucleons in single nucleons and noninteracting clusters -generates the most bound configuration of nucleons and clusters. Collisions among particles in PHQMD are treated in the same way as in PHSD. The PHQMD approach can be used in different modes for the hadron propagation: the mean-field based PHSD mode and the QMD mode based on different density dependent two-body potentials between the nucleons which correspond to the different equationsof-state (EoS). This allows to study the sensitivity of observables on the different descriptions of the potential interactions among nucleons. Here we present the first PHQMD results for general 'bulk' observables such as rapidity distributions and transverse mass spectra for hadrons (π, K,K, p,p, Λ,Λ) from SIS to RHIC energies, as well as for cluster production, including hypernuclei.

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“…For a comprehensive survey on strangeness production in near-threshold heavy-ion and proton-nucleus collisions, cf. [6], and for new simulation tools, see [7][8][9][10].) Inspired by this controversy of the KaoS and HADES interpretations we performed kinetic theory simulations of the collisions Au(1.23 A GeV) + Au and studied the time evolution of the slope parameters T K ± ,φ .…”

Section: Introductionmentioning

confidence: 99%

Dynamical Freeze-Out Phenomena: The Case of K±, φ Transverse Momentum Spectra in Collisions of Au(1.23 A GeV) + Au

Rabe

Kämpfer

2019

Particles

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We argue on a continuous (dynamical) kinetic freeze-out of K ± , φ observed at midrapidity in collisions Au(1.23 A GeV) + Au. The simulations by means of a transport model of BUU type point to time independent transverse momentum slope parameters after 20 fm/c. The complex interplay of expansion dynamics and strangeness production/exchange/absorption as well as elastic scatterings involved in the reaction network does not support the previous interpretation of a late freeze-out of K − due to larger cross sections. 25.75.Dw; 25.75.Ld

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Particle production and equilibrium properties within a new hadron transport approach for heavy-ion collisions

Cited by 246 publications

References 68 publications

Diffusion processes involving multiple conserved charges: A study from kinetic theory and implications to the fluid-dynamical modeling of heavy ion collisions

Diffusion processes involving multiple conserved charges: A study from kinetic theory and implications to the fluid-dynamical modeling of heavy ion collisions

Parton-hadron-quantum-molecular dynamics: A novel microscopic n -body transport approach for heavy-ion collisions, dynamical cluster formation, and hypernuclei production

Dynamical Freeze-Out Phenomena: The Case of K±, φ Transverse Momentum Spectra in Collisions of Au(1.23 A GeV) + Au

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