Can shadowing mimic the QCD phase transition?

Bravina, L.; Zabrodin, E.; Faessler, Amand; Fuchs, Christian

doi:10.1016/s0370-2693(99)01295-2

Cited by 13 publications

(11 citation statements)

References 25 publications

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“…As was discussed in, e.g. [51,52], the total flow of hadrons is a result of mutual cancellation of two competitive components, namely, the normal flow which follows the ongoing spectators, and the antiflow which develops towards the baryon dilute areas of collision. The normal flow integrated over the whole rapidity range is always slightly larger than the integrated antiflow.…”

Section: Discussion Of the Resultsmentioning

confidence: 97%

Microscopic study of energy and centrality dependence of transverse collective flow in heavy-ion collisions

et al. 2000

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The centrality dependence of directed and elliptic flow in light and heavy systems of colliding nuclei is studied within two microscopic transport models at energies from 1A GeV to 160A GeV. The pion directed flow has negative slope in the midrapidity range irrespective of bombarding energy and mass number of the colliding ions. In contrast, the directed flow of nucleons vanishes and even develops antiflow in the midrapidity range in (semi)peripheral collisions at energies around 11.6A GeV and higher. The origin of the disappearance of flow is linked to nuclear shadowing. Since the effect is stronger for a light system, it can be distinguished from the similar phenomenon caused by the quark-gluon plasma formation. In the latter case the disappearance of the flow due to the softening of the equation of state should be most pronounced in collisions of heavy ions. The centrality dependence of the elliptic flow shows that the maximum in the v 2 (b) distribution is shifted to very peripheral events with rising incident energy, in accord with experimental data. This is an indication of the transition from baryonic to mesonic degrees of freedom in hot hadronic matter.PACS numbers: 25.75.Ld, 24.10.Lx

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Section: Discussion Of the Resultsmentioning

confidence: 97%

Microscopic study of energy and centrality dependence of transverse collective flow in heavy-ion collisions

et al. 2000

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“…For heavy system the flatness of v N 1 (ỹ) at midrapidity accompanied by the transition to antiflow seems to build up atb ≥ 0.7 only. With increasing energy of the collision, however, this limit is shifted towards more central topologies [29,31].…”

Section: Quark-gluon String Modelmentioning

confidence: 95%

“…Directed flow of hadrons in heavy-ion collisions at energies from AGS (E lab = 11.6 AGeV) and up to RHIC ( √ s NN =200 GeV) was studied within the QGSM in Refs. [9,24,27,28,29,30,31,32,33,34]. Many of the features in the development of the directed flow are not attributed solely to QGSM but are common for a wide class of MC cascade models.…”

Section: Quark-gluon String Modelmentioning

confidence: 99%

Directed flow in heavy-ion collisions at NICA: What is interesting to measure?

Bravina

Zabrodin

2016

Eur. Phys. J. A

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We study the formation of the directed flow of hadrons in nuclear collisions at energies between AGS and SPS in Monte Carlo cascade model. The slope of the proton flow at midrapidity tends to zero (softening) with increasing impact parameter of the collision. For very peripheral topologies this slope becomes negative (antiflow). The effect is caused by rescattering of hadrons in remnants of the colliding nuclei. Since the softening of the proton flow can be misinterpreted as indication of the presence of quarkgluon plasma, we propose several measurements at NICA facility which can help one to distinguish between the cases with and without the plasma formation. 25.75.Ld, 24.10.Lx PACS

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“…The number of secondary interactions per particle with high rapidity is small, thus, the flow in the fragmentation regions is basically determined by the initial geometry of the system [30]. The centrality dependence of anisotropic flow in the QGSM has been studied in [37][38][39]. However, as was discussed in Sect.…”

Section: Directed Flow Of Hadrons a Comparison With Experimental Datamentioning

confidence: 99%

Transverse momentum dependence of directed particle flow at160AGeV

et al. 2001

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The transverse momentum (p t ) dependence of hadron flow at SPS energies is studied. In particular, the nucleon and pion flow in S+S and Pb+Pb collisions at 160A GeV is investigated. For simulations the microscopic quarkgluon string model (QGSM) is applied. It is found that the directed flow of pions v 1 (y, ∆p t ) changes sign from a negative slope in the low-p t region to a positive slope at p t ≥ 0.6 GeV/c as recently also observed experimentally. The change of the flow behaviour can be explained by early emission times for high-p t pions. We further found that a substantial amount of high-p t pions are produced in the very first primary NN collisions at the surface region of the touching nuclei. Thus, at SPS energies high-p t nucleons seem to be a better probe for the hot and dense early phase of nuclear collisions than high-p t pions. Both, in the light and in the heavy system the pion directed flow v 1 (p t , ∆y) exhibits large negative values when the transverse momentum approaches zero, as also seen experimentally in Pb+Pb collisions. It is found that this effect is caused by nuclear shadowing. The proton flow, in contrary, shows the typical linear increase with rising p t .

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Can shadowing mimic the QCD phase transition?

Cited by 13 publications

References 25 publications

Microscopic study of energy and centrality dependence of transverse collective flow in heavy-ion collisions

Microscopic study of energy and centrality dependence of transverse collective flow in heavy-ion collisions

Directed flow in heavy-ion collisions at NICA: What is interesting to measure?

Transverse momentum dependence of directed particle flow at160AGeV

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