Deep sub-threshold<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Ξ</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Λ</mml:mi></mml:math>production in nuclear collisions with the UrQMD transport model

Graef, G.; Steinheimer, Jan; Li, F.; Bleicher, Marcus

doi:10.1103/physrevc.90.064909

Cited by 63 publications

(63 citation statements)

References 44 publications

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“…This includes reactions of the type N + K ↔ Y + π as well as Y + K ↔ Ξ + π. Such reactions are included in the UrQMD transport approach however it was shown that they are not sufficient to explain the large Ξ/Λ ratio in Ar+KCl and p+Nb reactions measured with the HADES experiment (see [32] for a detailed discussion).…”

Section: Introductionmentioning

confidence: 99%

Recent results from strangeness in transport models

Steinheimer

Botvina

Bleicher

2016

J. Phys.: Conf. Ser.

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Abstract. In these proceedings we discuss recent developments in the microscopic description of strange particle production in nuclear collisions. We put a special emphasis on the production of hypernuclei at the upcoming FAIR and NICA facilities as well as the deep sub threshold, φ and Ξ − production yields measured with the HADES experiment. Employing new resonance decay channels we obtain a satisfactory description of φ and Ξ − production in deep sub threshold Ar+KCl reactions. Our results implicate that no new medium effects are required to describe the rare strange particle production data from low energy nuclear collisions. IntroductionStrange hadrons have long since been considered to be a good probe for the properties of dense hadronic matter [1, 2] created in nuclear collisions. The properties of such hot and dense systems are subject of investigation of running and planned experimental programs at the GSI/FAIR [3], NICA [4] and RHIC facilities. To understand the dynamics in such collisions one usually employs microscopic transport models.For example, by modifying the medium properties of strange hadrons in a transport study, it was found that the production rates and properties of Kaons are a promising probe to extract their medium interactions in low energy nuclear collisions [2,5,6,7,8,9,10,11,12,13,14,15,16].Furthermore recent progress has been made in the understanding of strange hadron dynamics at the LHC [17] and RHIC [18] with special attention payed to the role of strange particle dynamics in the hadronic, non-equilibrium, phase of ultra relativistic nuclear collisions [19,20,21,22,23].Similarly, the investigation of hypernuclei is a rapidly progressing field of nuclear physics, since these nuclei provide methods to study nuclear interactions in particle physics and nuclear astrophysics (see, e.g., [24, 25, 26, 27, 28] and references therein). Presently, hypernuclear physics is still focused on spectroscopic information and is dominated by a set of reactions induced by high-energy hadrons and leptons leading to the production of only few particles. Many experimental collaborations have started or plan to investigate hypernuclei and their properties in hadron and heavy ion induced reactions.

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Section: Introductionmentioning

confidence: 99%

Recent results from strangeness in transport models

Steinheimer

Botvina

Bleicher

2016

J. Phys.: Conf. Ser.

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“…their masses, quantum numbers, widths as well as scattering cross sections are, where known, taken from the particle data book [35]. In recent publications we have presented new features that were implemented and which turned out to be essential for the description of strange particle production below their elementary energy threshold [36,37]. These processes are the strangeness exchange reactions Y + π ↔ N + K as well as new decay channels for the most massive baryonic resonances included in UrQMD.…”

Section: The Urqmd Modelmentioning

confidence: 99%

Sub-threshold strangeness and charm production in UrQMD

Steinheimer

Bleicher

2017

J. Phys.: Conf. Ser.

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Abstract. We present recent results on the sub-threshold production of strange and charmed hadrons in nuclear collisions. In particular we highlight how the excitation and decay of heavy baryonic resonances can be used to describe the production yield of φ mesons at the SIS18 accelerator and show how this production mechanism also consistently describes the φ nuclear transparency ratio. Including even more massive baryonic resonances in the model we are able to extend our approach and make, for the first time, realistic predictions on the sub-threshold production of J/Ψ and Λc in nuclear collisions at the SIS100 accelerator at FAIR. We find that even at a beam energy of E lab = 6 A GeV, charm physics is feasible at the CBM experiment, which opens up new opportunities to study charmed hadron properties at large baryon densities.

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“…Another way of estimating the system size is through the comparison of simulation results with the experimental data as done in Ref. [12] where the UrQMD model [13] is used for this purpose. A study of the P b − P b collisions at different energies and centralities resulted in a freeze-out volume in the range 50 f m 3 to 250 f m 3 .…”

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Thermodynamics and fluctuations of conserved charges in a hadron resonance gas model in a finite volume

et al. 2015

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The thermodynamics of hot and dense matter created in heavy-ion collision experiments are usually studied as a system of infinite volume. Here we report on possible effects for considering a finite system size for such matter in the framework of the Hadron Resonance Gas model. The bulk thermodynamic variables as well as the fluctuations of conserved charges are considered. We find that the finite size effects are insignificant once the observables are scaled with the respective volumes. The only substantial effect is found in the fluctuations of electric charge which may therefore be used to extract information about the volume of fireball created in heavy-ion collision experiments.PACS numbers: 12.38. Mh,21.65.Mn, Our present day universe contains a significant fraction of matter in hadronic form. In the very early universe − a few microseconds after the Big Bang [1] when the temperature was extremely high, the strongly interacting matter is expected to have existed in the partonic form. Similar exotic state of matter may exist inside compact stars due to extremely high matter density attained by gravitational compression [2]. For the last few decades various experimental efforts are being made to recreate such exotic matter through the collisions of heavy-ions at ultra-relativistic energies. Experimental facilities at CERN (France/Switzerland), BNL (USA) and the upcoming facility at GSI (Germany) are at the forefront of efforts taken to create these exotic states of matter. One of the major goals in the experiments is to study thermodynamic properties of strongly interacting matter at high temperatures and densities. Present experimental data as well as lattice QCD simulations seem to indicate a smooth cross over from hadronic to quark gluon matter at low density and high temperature [3,4]. At high density and low temperature a first order transition is expected [5][6][7][8][9][10].Usually any thermodynamic study assumes the system volume to be infinite. However the fireball created in the relativistic heavy ion collision experiments has a finite spatial volume. The size of such spatial volume critically depends on three parameters : the size of the colliding nuclei, the center of mass energy ( √ s) and the centrality of collisions. Analysis of experimental data could reveal the freeze out volume of the system. One way to carry out such an analysis is the study of HBT radii which has been done in Ref.[11]. The major finding of this study indicates that the freeze out volume increases as the √ s increases and the estimated freeze out volume varies from 2000 f m 3 to 3000 f m 3 . Another way of estimating the system size is through the comparison of simulation results with the experimental data as done in Ref. [12] where the UrQMD model [13] is used for this purpose. A study of the P b − P b collisions at different energies and centralities resulted in a freeze-out volume in the range 50 f m 3 to 250 f m 3 . We note that these volumes as quoted above, are the freeze out volumes and as one looks back to the early...

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Deep sub-thresholdΞandΛproduction in nuclear collisions with the UrQMD transport model

Cited by 63 publications

References 44 publications

Recent results from strangeness in transport models

Recent results from strangeness in transport models

Sub-threshold strangeness and charm production in UrQMD

Thermodynamics and fluctuations of conserved charges in a hadron resonance gas model in a finite volume

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