Observables and Predictions

Senger, P.; Bratkovskaya, Elena; Andronic, A.; Averbeck, R.; Bellwied, R.; Friese, V.; Fuchs, Christian; Knoll, J.; Randrup, J.; Steinheimer, Jan

doi:10.1007/978-3-642-13293-3_6

Cited by 28 publications

(28 citation statements)

References 461 publications

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“…The expansion dynamics and possible high density shock waves evolving from the collision of the two nuclei, in particular in uneven sized colliding nuclei, are likely to be reflected in final state particle observables [102][103][104][105]. Vice versa, the determination of the speed of sound from easily accessible particle observables may provide in-depth information on the thermodynamic properties of nuclear matter, especially in relation to the phase transition where c s significantly drops [106][107][108][109][110][111][112].…”

Section: Thermodynamicsmentioning

confidence: 99%

Chiral hadronic mean field model including quark degrees of freedom

Rau¹,

Steinheimer²,

Schramm³

et al. 2013

J. Phys. G: Nucl. Part. Phys.

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Abstract. In an approach inspired by Polyakov loop extended NJL models, we present a nonlinear hadronic SU(3) σ-ω mean field model augmented by quark degrees of freedom. By introducing the effective Polyakov loop related scalar field Φ and an associated effective potential, the model includes all known hadronic degrees of freedom at low temperatures and densities as well as a quark phase at high temperatures and densities. Hadrons in the model exhibit a finite volume in order to suppress baryons at high T and µ This ensures that the right asymptotic degrees of freedom are attained for the description of strongly interacting matter and allows to study the QCD phase diagram in a wide range of temperatures and chemical potentials. Therefore, with this model it is possible to study the phase transition of chiral restoration and deconfinement. In this paper, the impact of quarks on the resulting phase diagram is shown. The results from the chiral model are compared to recent data from lattice QCD.

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Section: Thermodynamicsmentioning

confidence: 99%

Chiral hadronic mean field model including quark degrees of freedom

Rau¹,

Steinheimer²,

Schramm³

et al. 2013

J. Phys. G: Nucl. Part. Phys.

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“…Lattice quantum chromodynamics (lQCD) calculations suggest that at vanishing baryon chemical potential (μ B = 0) there is a crossover phase transition from hadronic to partonic degrees of freedom [1][2][3][4][5][6] for the deconfinement phase transition as well as for the restoration of chiral symmetry. However, at some finite baryon chemical potential the crossover might turn to a first-order phase transition implying a critical endpoint in the QCD phase diagram [7]. Since lattice calculations so far suffer from the fermion-sign problem, no first principle information on the phase boundary can be extracted from lQCD at large μ B , whereas at low μ B Taylor expansions of the thermodynamic potential (in powers of μ B /T ) provide an alternative solution.…”

Section: Introductionmentioning

confidence: 99%

Baryon-antibaryon dynamics in relativistic heavy-ion collisions

Seifert

Cassing

2018

Phys. Rev. C

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The dynamics of baryon-antibaryon annihilation and reproduction (BB ↔ 3M) is studied within the PartonHadron-String Dynamics (PHSD) transport approach for Pb+Pb and Au+Au collisions as a function of centrality from lower Super Proton Synchrotron (SPS) up to Large Hadron Collider (LHC) energies on the basis of the quark rearrangement model. At Relativistic Heavy-Ion Collider (RHIC) energies we find a small net reduction of baryon-antibaryon (BB) (2013)], where a deviation of 2.7 σ was claimed by the ALICE Collaboration, should not be attributed to a net antiproton annihilation. This is in line with the observation that no substantial deviation between the data and statistical hadronization model (SHM) calculations is seen for antihyperons, since according to the PHSD analysis the antihyperons should be modified by the same amount as antiprotons. As the PHSD results for particle ratios are in line with the ALICE data (within error bars) this might point towards a deviation from statistical equilibrium in the hadronization (at least for protons and antiprotons). Furthermore, we find that the BB ↔ 3M reactions are more effective at lower SPS energies where a net suppression for antiprotons and antihyperons up to a factor of 2-2.5 can be extracted from the PHSD calculations for central Au+Au collisions.

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“…Note that the latter mean fields have been discarded in our present studies. We speculate that extended theoretical approaches including consistently chiral partners as well as a restoration of chiral symmetry at high baryon density and/or temperature might lead to a solution of the current problems as well as precise experimental studies at FAIR, NICA or within the BES II program at RHIC [8].…”

Section: Discussionmentioning

confidence: 98%

Parton/hadron dynamics in heavy-ion collisions at FAIR energies

Cassing

Konchakovski

Palmese

et al. 2015

EPJ Web of Conferences

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Abstract. Recent STAR data for the directed flow of protons, antiprotons and charged pions obtained within the beam energy scan program are analyzed within the PartonHadron-String-Dynamics (PHSD/HSD) transport models. Both versions of the kinetic approach are used to clarify the role of partonic degrees of freedom. The PHSD results, simulating a partonic phase and its coexistence with a hadronic one, are roughly consistent with the STAR data. Generally, the semi-qualitative agreement between the measured data and model results supports the idea of a crossover type of quark-hadron transition which softens the nuclear EoS but shows no indication of a first-order phase transition. Furthermore, the directed flow of kaons and antikaons is evaluated in the PHSD/HSD approachesfrom √ s NN ≈ 3 -200 GeV which shows a high sensitivity to hadronic potentials in the FAIR/NICA energy regime √ s NN ≤ 8 GeV.

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Observables and Predictions

Cited by 28 publications

References 461 publications

Chiral hadronic mean field model including quark degrees of freedom

Chiral hadronic mean field model including quark degrees of freedom

Baryon-antibaryon dynamics in relativistic heavy-ion collisions

Parton/hadron dynamics in heavy-ion collisions at FAIR energies

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