MUSIC with the UrQMD Afterburner

Ryu, Sangwook; Jeon, Sangyong; Gale, Charles; Schenke, Björn; Young, Clint

doi:10.1016/j.nuclphysa.2013.02.031

Cited by 30 publications

(25 citation statements)

References 41 publications

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“…An EPOS calculation for peripheral collisions was not available at the time of writing, but it will be important to see how well the peripheral data can be described in this model, since it should include all relevant physics processes. Several other models implementing similar ideas (hydrodynamics model coupled to a hadronic cascade code, possibly with a description of fluctuations in the initial condition) are available in the literature [53,54] but not discussed in this paper. The simultaneous description of additional variables, such as the v n azimuthal flow coefficients within the same model, will help in differentiating different hydrodynamical model scenarios.…”

Section: A Transverse-momentum Distributions and Hydrodynamicsmentioning

confidence: 99%

Centrality dependence ofπ,K, andpproduction in Pb-Pb collisions ats
Abelev¹,
Adam²,
Adamová³
et al. 2013
Phys. Rev. C
563
34
394
2
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In this paper measurements are presented of π ± , K ± , p, andp production at midrapidity (|y| < 0.5), in Pb-Pb collisions at √ s NN = 2.76 TeV as a function of centrality. The measurement covers the transverse-momentum (p T ) range from 100, 200, and 300 MeV/c up to 3, 3, and 4.6 GeV/c for π , K, and p, respectively. The measured p T distributions and yields are compared to expectations based on hydrodynamic, thermal and recombination models. The spectral shapes of central collisions show a stronger radial flow than measured at lower energies, which can be described in hydrodynamic models. In peripheral collisions, the p T distributions are not well reproduced by hydrodynamic models. Ratios of integrated particle yields are found to be nearly independent of centrality. The yield of protons normalized to pions is a factor ∼1.5 lower than the expectation from thermal models.

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Section: A Transverse-momentum Distributions and Hydrodynamicsmentioning

confidence: 99%

Centrality dependence ofπ,K, andpproduction in Pb-Pb collisions ats
Abelev¹,
Adam²,
Adamová³
et al. 2013
Phys. Rev. C
563
34
394
2
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“…The early ideal hydrodynamics + hadron cascade hybrid model simulations have showed the hadronic matter is highly viscous, which largely suppress the elliptic flow when compared with the pure hydrodynamic calculations with a partially chemical equilibrium EoS [120]. Motivated by this, different groups have extended 2+1-d or 3+1-d viscous hydrodynamics with a hadronic afterburner [121][122][123]. Such hybrid models give a more realistic description for the hadronic evolution of the QGP fireball, which also naturally imprint the off-equilibrium chemical and thermal freeze-out procedures of various hadron species.…”

Section: B Hybrid Modelsmentioning

confidence: 99%

Collective flow and hydrodynamics in large and small systems at the LHC

2017

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In this article, we briefly review the recent progress on collective flow and hydrodynamics in large and small systems at the Large Hadron Collider (LHC), which includes the following topics: extracting the QGP viscosity from the flow data, initial state fluctuations and final state correlations at 2.76 A TeV Pb-Pb collisions, correlations and collective flow in high energy p-Pb and p-p collisions.

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“…If there are no additional interactions past the freeze-out, all experimental cuts may then be performed on this momentum distribution. In practice, however, one has to consider additional features such as the decay of unstable resonances, re-scattering in a dilute hadronic phase and acceptance effects which affect particles differently depending on their position in phase space [32][33][34][35][36]. Furthermore if particle fluctuations and correlations are to be investigated the final output of heavy ion simulation consists preferably of discrete particles with specific positions and momenta.…”

Section: Particle Production From Fluid Dynamicsmentioning

confidence: 99%

Effect of finite particle number sampling on baryon number fluctuations

Steinheimer

Koch

2017

Phys. Rev. C

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The effects of finite particle number sampling on the net baryon number cumulants, extracted from fluid dynamical simulations, are studied. The commonly used finite particle number sampling procedure introduces an additional Poissonian (or multinomial if global baryon number conservation is enforced) contribution which increases the extracted moments of the baryon number distribution. If this procedure is applied to a fluctuating fluid dynamics framework one severely overestimates the actual cumulants. We show that the sampling of so called test-particles suppresses the additional contribution to the moments by at least one power of the number of test-particles. We demonstrate this method in a numerical fluid dynamics simulation that includes the effects of spinodal decomposition due to a first order phase transition. Furthermore, in the limit where anti-baryons can be ignored, we derive analytic formulas which capture exactly the effect of particle sampling on the baryon number cumulants. These formulas may be used to test the various numerical particle sampling algorithms.The goal of heavy ion collision experiments is to study the properties of very hot and dense matter. It has been proposed that in the most energetic collisions of nuclei at the RHIC and LHC a new state of matter, the so called Quark-Gluon-Plasma, has been created [1][2][3][4][5]. Lattice QCD results predict the transition at vanishing net baryon number density to be a crossover [6][7][8]. Due to the fermion sign problem, these calculations cannot be directly extended to the interesting region of high net baryon density where the cross-over may change to a first order phase transition. One of the main goals of current and future experimental programs is to find experimental signals for a possible first order phase transition and critical point in the phase diagram of the strong interaction, Quantum Chromo Dynamics (QCD).The systems created in these nuclear collisions are very small, rapidly expanding and not always in local thermal and chemical equilibrium. Thus the dynamical evolution of such a collision is far from trivial and sophisticated transport models are being employed. The current stateof-the-art of such models are the fluid dynamical hybrid models. In these models one uses a non-equilibrium initial state for a viscous fluid dynamical evolution, which is followed by a Boltzmann-transport description for the hadronic freeze-out phase. This setup is convenient as the fluid dynamical equations allow for a straight forward inclusion of the Equation of State (EoS). Since the systems created in heavy ion collisions are rather small (on the order of ∼ 10-20 fm) the application of standard fluid dynamics is limited. In fluid dynamics one usually assumes that the particle number in a given fluid element sufficiently large so that local fluctuations of the particle number, and hence of the baryon-and energy density, can be neglected. Since this is not strictly the case in heavy ion collisions new fluid * steinheimer@fias.uni-frankfurt.de † vko...

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MUSIC with the UrQMD Afterburner

Cited by 30 publications

References 41 publications

Centrality dependence ofπ,K, andpproduction in Pb-Pb collisions ats
Abelev¹,
Adam²,
Adamová³
et al. 2013
Phys. Rev. C
563
34
394
2
View full text Add to dashboard Cite

Centrality dependence ofπ,K, andpproduction in Pb-Pb collisions ats
Abelev¹,
Adam²,
Adamová³
et al. 2013
Phys. Rev. C
563
34
394
2
View full text Add to dashboard Cite

Collective flow and hydrodynamics in large and small systems at the LHC

Effect of finite particle number sampling on baryon number fluctuations

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MUSIC with the UrQMD Afterburner

Cited by 30 publications

References 41 publications

Centrality dependence ofπ,K, andpproduction in Pb-Pb collisions atsAbelev1, Adam2, Adamová3 et al. 2013Phys. Rev. C563343942View full textAdd to dashboardCite

Centrality dependence ofπ,K, andpproduction in Pb-Pb collisions atsAbelev1, Adam2, Adamová3 et al. 2013Phys. Rev. C563343942View full textAdd to dashboardCite

Collective flow and hydrodynamics in large and small systems at the LHC

Effect of finite particle number sampling on baryon number fluctuations

Contact Info

Product

Resources

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Centrality dependence ofπ,K, andpproduction in Pb-Pb collisions ats
Abelev¹,
Adam²,
Adamová³
et al. 2013
Phys. Rev. C
563
34
394
2
View full text Add to dashboard Cite

Centrality dependence ofπ,K, andpproduction in Pb-Pb collisions ats
Abelev¹,
Adam²,
Adamová³
et al. 2013
Phys. Rev. C
563
34
394
2
View full text Add to dashboard Cite