Hadronic particle production in nucleus-nucleus collisions

Senger, P.; Ströbele, H.

doi:10.1088/0954-3899/25/5/201

Cited by 64 publications

(96 citation statements)

References 219 publications

(469 reference statements)

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“…The fit of our results, taken together with the E877 one, to the simple scaling law σ η = a + b × ln √ s [25,26], gives σ η = (0.58 ± 0.09) + (0.32 ± 0.04) × ln √ s (solid line), confirming the already observed fact that the width of the pseudorapidity distribution in central ion-ion collisions at AGS-SPS energies appears to follow a simple logarithmic scaling law independent of system size 6 . It is interesting to note [32] that at 158 GeV/nucleon the width of the rapidity distributions is about twice as large as the one expected from a single thermal source located at midrapidity. We have also reported in Fig.…”

Section: Properties Of the Pseudorapidity Distributionsmentioning

confidence: 94%

Scaling of charged particle multiplicity in Pb–Pb collisions at SPS energies

Abreu

Alessandro

Alexa³

et al. 2002

Physics Letters B

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The charged particle multiplicity distribution dN ch /dη has been measured by the NA50 experiment in Pb-Pb collisions at the CERN SPS. Measurements were done at incident energies of 40 and 158 GeV per nucleon over a broad impact parameter range. The multiplicity distributions are studied as a function of centrality using the number of participating nucleons (N part ), or the number of binary nucleon-nucleon collisions (N coll ). Their values at midrapidity exhibit a power law scaling behaviour given by N 1.00 part and N 0.75 coll at 158 GeV. Compatible results are found for the scaling behaviour at 40 GeV. The width of the dN ch /dη distributions is larger at 158 than at 40 GeV/nucleon and decreases slightly with centrality at both energies. Our results are compared to similar studies performed by other experiments both at the CERN SPS and at RHIC.

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Section: Properties Of the Pseudorapidity Distributionsmentioning

confidence: 94%

Scaling of charged particle multiplicity in Pb–Pb collisions at SPS energies

Abreu

Alessandro

Alexa³

et al. 2002

Physics Letters B

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“…The average transverse momentum of such nucleons, P t ∼ 0.2− 0.4 GeV/c [42], is higher compared to ED neutrons; their P t distributions are shown in Fig. 3.…”

Section: B Neutron Emission In Grazing Hadronic Interactionsmentioning

confidence: 98%

Neutron emission in electromagnetic dissociation of ultrarelativistic Pb ions

Golubeva¹,

Guber²,

Karavicheva³

et al. 2005

Phys. Rev. C

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New data on forward neutron emission in fragmentation of Pb ions on Al, Cu, Sn, and Pb nuclei are presented. The measurements were performed at the CERN SPS in the framework of the ALICE-LUMI experiment. The measured cross sections are compared with predictions of the RELDIS model for electromagnetic interactions and with results of the abrasion-ablation model for hadronic interactions. The electromagnetic excitation of a Pb projectile followed by single-and double-neutron emission is found to be the dominant process in full agreement with theoretical estimations. The measured 1nX cross sections are generally well described. The measured 2nX data, which are 4-5 times lower than the 1nX data, are slightly underestimated by theory. Nevertheless, the sum of 1nX and 2nX cross sections is in good agreement with theory. This confirms the predictive power of the RELDIS model, which can be used to calculate the sum of 1nX and 2nX emission rates for the purpose of calibration of luminosity measurements in PbPb collisions at the Large Hadron Collider at CERN.

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“…The QGP is a state in which the individual hadrons dissolve into a gas of free (or almost free) quarks and gluons in strongly compressed and hot matter (for recent reviews on the topic, we refer to [1,2]). The achievable energyand baryon densities depend on the extend to which the nuclei are stopped during penetration, thus on centrality and bombarding energy.Strange particles, especially multi-strange baryons (which have more than one strange quark) carry vital information about the collision dynamics [3][4][5][6][7][8][9][10]. Relative strangeness abundancies have been proposed as a powerful tool for searching the transition from hadronic matter to partonic matter in high energy nuclear collisions [3][4][5].…”

mentioning

confidence: 99%

Strangeness enhancement from strong color fields at relativistic heavy ion energies

et al. 2000

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In ultra-relativistic heavy ion collisions, early stage multiple scatterings may lead to an increase of the color electric field strength. Consequently, particle production -especially heavy quark (and di-quark) production -is greatly enhanced according to the Schwinger mechanism. We test this idea via the Ultra-relativistic Quantum Molecular Dynamics model (UrQMD) for Au+Au collisions at the full RHIC energy ( √ s = 200 AGeV). Relative to p+p collisions, a factor of 60, 20 and 7 enhancement respectively, for Ω (sss), Ξ (ss), and Λ, Σ (s) is predicted for a model with increased color electric field strength. LBNL-preprint: LBNL-46167One of the major goals of the relativistic heavy ion collider (RHIC) at Brookhaven National Laboratory is to explore the phase diagram of hot and dense matter near the quark gluon plasma (QGP) phase transition. The QGP is a state in which the individual hadrons dissolve into a gas of free (or almost free) quarks and gluons in strongly compressed and hot matter (for recent reviews on the topic, we refer to [1,2]). The achievable energyand baryon densities depend on the extend to which the nuclei are stopped during penetration, thus on centrality and bombarding energy.Strange particles, especially multi-strange baryons (which have more than one strange quark) carry vital information about the collision dynamics [3][4][5][6][7][8][9][10]. Relative strangeness abundancies have been proposed as a powerful tool for searching the transition from hadronic matter to partonic matter in high energy nuclear collisions [3][4][5]. Indeed, strangeness enhancement has be observed in heavy ion collisions at all collision energies with different colliding systems.Recently, measurements by the WA97 and the NA49 collaborations clearly demonstrated the relative enhancement of the (anti-)hyperon yields (Λ, Ξ, Ω) in Pb-Pb collisions as compared to p-Pb collisions [11][12][13][14][15][16]. The observed enhancement increases with the strangeness content (|S| = 1, 2, 3) of the probe under investigation * Feodor Lynen Fellow of the Alexander v. Humboldt Foundation, E -mail: bleicher@nta2.lbl.gov [11][12][13][14][15][16]. For the (Ω − + Ω − )-yield the enhancement factor is as large as 15.A number of different mechanisms are under debate to understand this strong increase in strangeness production with centrality and beam energy:• Equilibrated (gluon rich) plasma phase: Chemical and flavour equilibration times are predicted to be shorter in a plasma phase than in a thermally equilibrated hadronic fireball of T ∼ 160 MeV [3]. Thus, a dominant production mechanism for strangeness in an equilibrated gluon rich plasma phase (Hot glue scenario [17]), might be the production of ss pairs via gluon fusion (gg → ss) [3]. This might allow for strangeness equilibration within the lifetime of the QGP, resulting in strong strangeness enhancement compared to hadronic scenarios.• Baryon-junctions: A baryon junction exchange mechanism was proposed to explain valence baryon number transport in nuclear collisions. Recently it wa...

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Hadronic particle production in nucleus-nucleus collisions

Cited by 64 publications

References 219 publications

Scaling of charged particle multiplicity in Pb–Pb collisions at SPS energies

Scaling of charged particle multiplicity in Pb–Pb collisions at SPS energies

Neutron emission in electromagnetic dissociation of ultrarelativistic Pb ions

Strangeness enhancement from strong color fields at relativistic heavy ion energies

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