Longitudinal dynamics of high baryon density matter in high-energy heavy-ion collisions

Li, Ming; Shen, Chun

doi:10.1103/physrevc.98.064908

Cited by 30 publications

(26 citation statements)

References 78 publications

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“…Additionally, new facilities such as the Facility for Antiproton and Ion Research (FAIR) and Nuclotron-based Ion Collider fAcility (NICA) are under construction to explore in particular the intermediate energy range of 4 GeV ≤ √ s N N ≤ 20 GeV, where one might study also the competition between chiral symmetry restoration and deconfinement [46,47]. Accordingly, the partonic and hadronic dynamics at finite or large baryon densities (or chemical potentials) are of actual interest and are addressed also in various hydrodynamical models [48][49][50][51], hydrodynamical + hadron transport models [52][53][54], and more parametric approaches [55]. However, as found in Ref.…”

Section: Introductionmentioning

confidence: 99%

Exploring the partonic phase at finite chemical potential within an extended off-shell transport approach

et al. 2019

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We extend the parton-hadron-string dynamics (PHSD) transport approach in the partonic sector by explicitly calculating the total and differential partonic scattering cross sections as a function of temperature T and baryon chemical potential µB on the basis of the effective propagators and couplings from the dynamical quasiparticle model (DQPM) that is matched to reproduce the equation of state of the partonic system above the deconfinement temperature Tc from lattice QCD. We calculate the collisional widths for the partonic degrees of freedom at finite T and µB in the timelike sector and conclude that the quasiparticle limit holds sufficiently well. Furthermore, the ratio of shear viscosity η over entropy density s, i.e., η/s, is evaluated using the collisional widths and compared to lattice QCD calculations for µB = 0 as well. We find that the novel ratio η/s does not differ very much from that calculated within the original DQPM on the basis of the Kubo formalism. Furthermore, there is only a very modest change of η/s with the baryon chemical µB as a function of the scaled temperature T /Tc(µB). This also holds for a variety of hadronic observables from central A + A collisions in the energy range 5 GeV ≤ √ sNN ≤ 200 GeV when implementing the differential cross sections into the PHSD approach. We only observe small differences in the antibaryon sector (p,Λ +Σ 0 ) at √ sNN = 17.3 GeV and 200 GeV with practically no sensitivity of rapidity and pT distributions to the µB dependence of the partonic cross sections. Small variations in the strangeness sector are obtained in all collisional systems studied (A + A and C + Au); however, it will be very hard to extract a robust signal experimentally. Since we find only small traces of a µB dependence in heavy-ion observables -although the effective partonic masses and widths as well as their partonic cross sections clearly depend on µB -this implies that one needs a sizable partonic density and large space-time QGP volume to explore the dynamics in the partonic phase. These conditions are only fulfilled at high bombarding energies where µB is, however, rather low. On the other hand, when decreasing the bombarding energy and thus increasing µB, the hadronic phase becomes dominant and accordingly it will be difficult to extract signals from the partonic dynamics based on "bulk" observables.

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Section: Introductionmentioning

confidence: 99%

Exploring the partonic phase at finite chemical potential within an extended off-shell transport approach

et al. 2019

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“…The applicability of the SAM to measurements at lower collision energies, like e.g. beam energy scan at RHIC, however, is less clear: the created system is not uniform, with matter properties differing strongly between central and forward-backward rapidity regions [23] while the absence of the longitudinal boost invariance does not allow one to properly correlate the experimental momentum acceptance with a coordinate space subvolume.…”

Section: Introductionmentioning

confidence: 99%

Correcting event-by-event fluctuations in heavy-ion collisions for exact global conservation laws with the generalized subensemble acceptance method

Vovchenko

2021

Preprint

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We introduce the subensemble acceptance method 2.0 (SAM-2.0) -a procedure to correct cumulants of a random number distribution inside a subsystem for the effect of exact global conservation of a conserved quantity to which this number is correlated, with applications to measurements of event-by-event fluctuations in heavy-ion collisions. The method expresses the corrected cumulants in terms of the cumulants inside and outside the subsystem that are not subject to the exact conservation. The derivation assumes that all probability distributions associated with the cumulants are peaked at the mean values but are otherwise of arbitrary shape. The formalism reduces to the original SAM [1] when applied to a coordinate space subvolume of a uniform thermal system. As the new method is restricted neither to the uniform systems nor to the coordinate space, it is applicable to fluctuations measured in heavy-ion collisions at various collision energies in different momentum space acceptances. The SAM-2.0 thus brings the experimental measurements and theoretical calculations of event-by-event fluctuations closer together, as the latter are typically performed without the account of exact global conservation.

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“…( 8) as its non-critical value. In the limit of zero net baryon density, κ n,0 remains non-zero at non-zero temperature, lim µ→0 κ n,0 /τ n,0 = nT /(3µ) [52] -a feature also seen in holographic models; for example, using the AdS/CFT correspondence, the (baryon) charge conductivity of r-charged black holes translates into [73,88]…”

Section: Setup Of the Frameworkmentioning

confidence: 97%

“…In this exploratory study, however, we try to establish a basic understanding of baryon diffusion dynamics for Au-Au collisions at √ s NN = 19.6 GeV in which we focus entirely on the longitudinal dynamics, modeling a (1+1)dimensional system without transverse gradients initiated instantaneously at a constant proper time τ i (see also Refs. [68,88]). More specifically, we evolve the system hydrodynamically using the longitudinal initial profiles e(τ i , η s ), n(τ i , η s ) provided in Ref.…”

Section: Setup Of the Frameworkmentioning

confidence: 99%

Baryon transport and the QCD critical point

Du,

An,

Heinz

2021

Preprint

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Fireballs created in relativistic heavy-ion collisions at different beam energies have been argued to follow different trajectories in the QCD phase diagram in which the QCD critical point serves as a landmark. Using a (1+1)-dimensional model setting with transverse homogeneity, we study the complexities introduced by the fact that the evolution history of each fireball cannot be characterized by a single trajectory but rather covers an entire swath of the phase diagram, with the finally emitted hadron spectra integrating over contributions from many different trajectories. Studying the phase diagram trajectories of fluid cells at different space-time rapidities, we explore how baryon diffusion shuffles them around, and how they are affected by critical dynamics near the QCD critical point. We find a striking insensitivity of baryon diffusion to critical effects. Its origins are analyzed and possible implications discussed.

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Longitudinal dynamics of high baryon density matter in high-energy heavy-ion collisions

Cited by 30 publications

References 78 publications

Exploring the partonic phase at finite chemical potential within an extended off-shell transport approach

Exploring the partonic phase at finite chemical potential within an extended off-shell transport approach

Correcting event-by-event fluctuations in heavy-ion collisions for exact global conservation laws with the generalized subensemble acceptance method

Baryon transport and the QCD critical point

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