A Study of the pB &amp;rarr; Y K Reactions for Kaon Production in Heavy Ion Collisions

Tsushima, K.; Huang, S.W.; Faessler, Amand

doi:10.1071/p96052

Cited by 26 publications

(43 citation statements)

References 10 publications

(19 reference statements)

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“…In the calculations we use the parameters of ref. [1,2] and obtain K + cross sections which fairly well agree with the data for for both targets and angles. 3 φ Production…”

Section: Gev Beam Energy Withsupporting

confidence: 75%

“…Cross sections as estimated in refs. [1,2] have successfully been applied and a weak repulsive potential being roughly proportional to the nuclear density n of about 25 n/n 0 MeV has been extracted [3]. This knowledge is very important for understanding the production of K − which in threshold region are mainly produced in secondary collisions of nucleons and pions with hyperons (Y ) that has been created together with K + mesons.…”

Section: Introductionmentioning

confidence: 99%

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Calculations of K ± and ϕ Production in Near-Threshold Proton–Nucleus Collisions

Barz

Kämpfer

Naumann

et al. 2005

Acta Physica Hungarica A) Heavy Ion Physics

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K± and φ meson production in proton-nucleus (pA) collisions has been calculated within a BUU transport model. It is shown that the nucleon-hyperon strangeness transfer channel is essential. The role of three-body reactions has been investigated within the medium. The target mass dependence of φ production is predicted to give important information on the in-medium properties of all three mesons.

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“…In the calculations we use the parameters of ref. [1,2] and obtain K + cross sections which fairly well agree with the data for for both targets and angles. 3 φ Production…”

Section: Gev Beam Energy Withsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Calculations of K ± and ϕ Production in Near-Threshold Proton–Nucleus Collisions

Barz

Kämpfer

Naumann

et al. 2005

Acta Physica Hungarica A) Heavy Ion Physics

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Section: Pacsmentioning

confidence: 99%

“…First, with the same set of parameters, one should reproduce simultaneously the experimental data for the πN → ΛK reaction. Indeed, the approach of the resonance model made previously [4] and again here uses the same parameter set consistently with that used for the study of the πN → ΛK reactions as well as the πN → ΣK reactions [6,8]. Thus, our study for this reaction does not have much freedom to vary the parameters, nor to introduce new parameters.…”

Section: Pacsmentioning

confidence: 99%

“…Their properties are sum-1 marized in Table 1. Most of the coupling constants, cut-off parameters and form factors have been fixed by the previous studies for the πN → Y K (Y = Σ, Λ) reactions [6,8].Together with the quantities newly appearing in the pp → pΛK + reaction [4], we summarize the parameters of our model used for this study in Table 2.Here, we should comment that the main features of our results are very similar to those of Fäldt and Wilkin [5]. In particular, the π-meson exchange is dominant at energies close to the reaction threshold.…”

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confidence: 99%

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A clue to the mechanism of ΛK+ production in pp-reactions

1998

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We analyse the pp → pΛK + total cross section data which were recently measured by the COSY-11 collaboration at an energy 2 MeV above the reaction threshold. Our analysis suggests that the measurement of the invariant mass spectrum for the ΛK + at energies around 100 MeV above the threshold can provide a new constraint on the theoretical calculations for this reaction. In particular, the measurement can give a clue as to whether the reaction is dominated by resonance excitation or not. Thus, it should contribute to further understanding of the strangeness production mechanism. We show the invariant mass spectra for the ΛK + system in these optimal kinematic conditions calculated by several approaches, and demonstrate that our suggestion is experimentally feasible. : 13.75, 25.40, 14.20.G, 24.10 Keywords: Kaon production, Proton proton collision, Baryon resonance, One boson exchange, ΛK + invariant mass spectrum * Supported in part by the Forschungszentrum Jülich, and the Australian Research Council † sibirt@theorie.physik.uni-giessen.de ‡ ktsushim@physics.adelaide.edu.au § athomas@physics.adelaide.edu.au 0 Recently the COSY-11 Collaboration [1] measured the total cross section for the reaction, pp → pΛK + , at energy 2 MeV above the reaction threshold. The data were compared with the theoretical models which are presently available for this reaction [2,3,4,5]. Among them, both the predictions of Sibirtsev [2] and Li and Ko [3] could reproduce the experimental data at this energy well only with the inclusion of pion and kaon exchanges, but without the inclusion of any resonances which are observed to decay to the ΛK + channel. Moreover, it was found [2,3] that the dominant contribution to the pp → pΛK + reaction comes from the K-exchange mechanism. Alternatively, the study of Fäldt and Wilkin [5] which was made analogous to the pp → ppη reaction with a nonrelativistic treatment including the final state interaction, suggests that the total cross sections for the pp → pΛK + reactions at energies only slightly above threshold can possibly be explained by one pion-exchange followed by N ⋆ (1650) resonance excitation. Furthermore, they claim that these two ingredients alone are almost enough to describe the data. One of their motivations was to study whether the same type of meson exchange model could be capable of explaining simultaneously the near-threshold η and K production data -one pion exchange followed by N ⋆ (1650) resonance excitation for the present case. PACSIn Ref.[4], within the resonance model, we performed the most detailed study of kaon production in proton-proton collisions with a full relativistic treatment. This included the mechanism adopted by Fäldt and Wilkin [5] as just one of the processes in evaluating the total cross sections. However, it has turned out that our calculation underestimates the data [1] at energy 2 MeV above the threshold -as shown in Fig. 1. It underestimates the experimental data from COSY by about a factor of 2, although it reproduces the existing data fairly wel...

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Aspects of particle production in isospin-asymmetric matter

et al. 2005

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The production/absorption rate of particles in compressed and heated asymmetric matter is studied using a Relativistic Mean Field (RM F ) transport model with an isospin dependent collision term. Just from energy conservation in the elementary production/absorption processes we expect to see a strong dependence of the yields on the basic Lorentz structure of the isovector effective interaction, due to isospin effects on the scalar and vector self-energies of the hadrons. This will be particularly evident for the ratio of the rates of particles produced with different charges: results are shown for π + /π − , K + /K 0 yields. In order to simplify the analysis we perform RM F cascade simulations in a box with periodic boundary conditions. In this way we can better pin down all such fine relativistic effects in particle production, that could likely show up even in realistic heavy ion collisions. In fact the box properties are tuned in order to reproduce the heated dense matter formed during a nucleus-nucleus collision in the few AGeV beam energy region. In particular, K +,0 production is expected to be directly related to the high density behaviour of the symmetry energy, since kaons are produced very early during the high density stage of the collision and their mean free path is rather large. We show that the K + /K 0 ratio reflects important isospin contributions on the production rates just because of the large sensitivity around the threshold. The results are very promising for the possibility of a direct link between particle production data in exotic Heavy Ion Collisions (HIC) and the isospin dependent part of the Equation of State (EoS) at high baryon densities.

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A Study of the pB → Y K Reactions for Kaon Production in Heavy Ion Collisions

Cited by 26 publications

References 10 publications

Calculations of K ± and ϕ Production in Near-Threshold Proton–Nucleus Collisions

Calculations of K ± and ϕ Production in Near-Threshold Proton–Nucleus Collisions

A clue to the mechanism of ΛK+ production in pp-reactions

Aspects of particle production in isospin-asymmetric matter

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