Baryon stopping and hyperon enhancement in the improved dual parton model

Capella, A.; Salgado, Carlos A.

doi:10.1103/physrevc.60.054906

Cited by 42 publications

(76 citation statements)

References 42 publications

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“…8 [16,10] by a mechanism of color ropes which consider fusion of strings; also in the Ultra Relativistic Quantum Molecular Dynamics model [17] and in the HIJING model [18] by using an ad hoc multiplicative factor in the string tension. Also the Dual Parton Model [14], considering the possibility of creation of diquark-antidiquark pairs in the nucleon sea, together with the inclusion of diagrams which take into account baryon junction migration [49,50,51], can reproduce the experimental data (for Ω's some rescattering has still to be added). The string fusion is the main ingredient to obtain an enhancement ofΛ production and also to reproduce the Ξ data.…”

Section: Proton-nucleus and Nucleus-nucleus Collisionsmentioning

confidence: 93%

“…As discussed for strangeness enhancement, it has been pointed out that baryon junction migration [49,50,51] will enhance the stopping power due to diagrams additional to the usual ones of the Dual Parton Model. The inclusion of these diagrams also explains the SPS data.…”

Section: Proton-nucleus and Nucleus-nucleus Collisionsmentioning

confidence: 99%

“…(see [13] for a study of evolution of particle and energy densities). Nevertheless, it is usually assumed that the enhancement of hyperons, antihyperons and φ's observed in heavy ion experiments at SPS [4,5,6,7,8] cannot be fully explained by using exclusively a mechanism which goes beyond the independent string hypothesis, as string fusion [12,16,17,18,39] or baryon junction migration [18,28,49,50,51]. In order to reproduce these experimental features rescattering of particles in the hadron gas (produced particles among themselves and with spectator nucleons) [52] has been introduced in many models.…”

Section: Rescattering Of Secondariesmentioning

confidence: 99%

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Monte Carlo model for nuclear collisions from SPS to LHC energies

et al. 2001

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A Monte Carlo model to simulate nuclear collisions in the energy range going from SPS to LHC, is presented. The model includes in its initial stage both soft and semihard components, which lead to the formation of color strings. Collectivity is taken into account considering the possibility of strings in color representations higher than triplet or antitriplet, by means of string fusion. String breaking leads to the production of secondaries. At this point, the model can be used as initial condition for further evolution by a transport model. In order to tune the parameters and see the results in nucleus-nucleus collisions, a naif model for rescattering of secondaries is introduced. Results of the model are compared with experimental data, and predictions for RHIC and LHC are shown.

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Section: Proton-nucleus and Nucleus-nucleus Collisionsmentioning

confidence: 93%

Section: Proton-nucleus and Nucleus-nucleus Collisionsmentioning

confidence: 99%

Section: Rescattering Of Secondariesmentioning

confidence: 99%

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Monte Carlo model for nuclear collisions from SPS to LHC energies

et al. 2001

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“…• Diquark breaking and sea-diquarks: A new version of the dual parton model, featuring an improved diquark breaking mechanism has been applied to explain the observed strangeness enhancement at the full SPS energy [19]. Here, the strange-and antibaryon production invokes strings originating from diquark-antidiquark pairs in the nucleon sea to reproduces the observed yields of p and Lambda and their antiparticles.…”

Section: Lbnl-preprint: Lbnl-46167mentioning

confidence: 99%

“…It was found that Baryon junctionanti-junction (J anti-J) loops can indeed enhance anti-Lambda, anti-Xi, anti-Omega yields at SPS energies. While this mechanism leads to a reasonable description of central interactions, it can not explain the enhancement in the measured hyperon to anti-hyperon ratios with increasing centrality.• Diquark breaking and sea-diquarks: A new version of the dual parton model, featuring an improved diquark breaking mechanism has been applied to explain the observed strangeness enhancement at the full SPS energy [19]. Here, the strange-and antibaryon production invokes strings originating from diquark-antidiquark pairs in the nucleon sea to reproduces the observed yields of p and Lambda and their antiparticles.…”

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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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