Production of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Mesons in 2.1-GeV/Nucleon Nuclear Collisions

Schnetzer, S.; Lemaire, M. C.; Lombard, R.M.; Moeller, Elvira; Nagamiya, S.; Shapiro, G.; Steiner, H.; Tanihata, I.

doi:10.1103/physrevlett.49.989

Cited by 103 publications

(42 citation statements)

References 11 publications

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“…Corresponding experiments have been the focus of studies by the KaoS [11][12][13][14][15] and FOPI [16][17][18][19][20] Collaborations over the last two decades, following up on the pioneering experiments at Bevalac [21]. The heavy-ion data are supplemented by proton-induced reactions on nuclei [22,23] with measurements of inclusive K + and K − production.…”

Section: Introductionmentioning

confidence: 99%

ϕ decay: A relevant source forK−production at energies available at the GSI Schwerionen-Synchrotron (SIS)?

Agakishiev¹,

Bałanda²,

Bannier³

et al. 2009

Phys. Rev. C

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Section: Introductionmentioning

confidence: 99%

ϕ decay: A relevant source forK−production at energies available at the GSI Schwerionen-Synchrotron (SIS)?

Agakishiev¹,

Bałanda²,

Bannier³

et al. 2009

Phys. Rev. C

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“…Furthermore, they can be also sensitive probes for the nuclear equation of state (EOS) [3]. For these reasons, many studies of kaon production in heavy ion collisions have been performed both theoretically and experimentally [1]- [13].…”

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confidence: 99%

“…We assume the ∆(1920) contribution is dominant, due to the experimental branching ratios [15,16], and the fact that only charge 2e intermediate states are allowed. Then the incoherent contributions of this ∆(1920) resonance to each total cross section at this peak position may be estimated as follows: 1 9 |M c | 2 ∝ 1 9 σ(π + p) ≃ 0.08 mb for the channels defined by eq. (6), 2 9 |M c | 2 ∝ 2 9 σ(π + p) ≃ 0.16 mb for the channels defined by eqs.…”

mentioning

confidence: 99%

“…Fa 67/14-1 † Supported by GSI under contract No. 06 TÜ 736 0 Because kaons (K + ) have a long mean free path inside the nucleus, one believes that they are good messengers to provide information about the high density and temperature phase of the heavy ion collisions [1,2]. Furthermore, they can be also sensitive probes for the nuclear equation of state (EOS) [3].…”

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confidence: 99%

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The role of the Δ (1920) resonance for kaon production in heavy ion collisions

1994

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The long mean free path of K + mesons in nuclear matter makes this particle a suitable messenger for the dynamics of nucleus-nucleus reactions at intermediate energies (100 MeV to 3 GeV per nucleon). A prerequisite for this is the knowledge of the elementary production cross sections πN → ΣK. Here these cross sections are studied for the first time with the explicite inclusion of the rel (1 − ) vector meson exchange is included. It is shown that the total cross sections for different channels of the πN → ΣK reactions, i.e. π + p → Σ + K + , π − p → Σ − K + , π + n → Σ 0 K + (π − p → Σ − K + ) and π 0 p → Σ 0 K + differ not only by absolute values but also by their energy dependence. This shape differences are due to the mixture of the isospin I = 3/2 ∆(1920) with isospin I = 1/2 nucleon resonances. However, this I = 3/2 resonance does not give a contribution to the πN → ΛK reactions. So the shapes of the total cross sections πN → ΛK for different isospin projections are the same. In spite of this, such cross sections averaged over different isospin projections in the same multiplet are often used for studies of kaon production in heavy-ion collisions. Here we give an explicit separate parametrization of the cross sections for each channel πN → ΣK, which are calculated in this work. The total cross section for π − p → Σ − K + which runs through different I = 3/2 and I = 1/2 resonances can be well reproduced by the present model. * Supported by DFG under contract No. Fa 67/14-1 † Supported by GSI under contract No. 06 TÜ 736 0 Because kaons (K + ) have a long mean free path inside the nucleus, one believes that they are good messengers to provide information about the high density and temperature phase of the heavy ion collisions [1,2]. Furthermore, they can be also sensitive probes for the nuclear equation of state (EOS) [3]. For these reasons, many studies of kaon production in heavy ion collisions have been performed both theoretically and experimentally [1]- [13].In most theoretical studies of the kaon production in heavy ion collisions by either the Vlasov-Uehling-Uhlenbeck approach (VUU) [4], or by "quantum" molecular dynamics (QMD) [5,6], however, the kaon elementary production cross sections in free space parametrized by J. Randrup and C. M. Ko [12] for B 1 B 2 → B 3 Y K, and by J. Cugnon and R. M. Lombard [13] for πN → Y K are widely used. Here B stands for either the nucleon or the ∆(1232), Y stands for either the Σ or the Λ, respectively. Although there exists a relatively long history for kaon production studies, not many investigations have been performed for the elementary process [14].On the other hand, due to recent high precision data, we have now rich and accurate informations on the baryon resonances, on quantum numbers, on decay modes, on decay rates and so on [15,16]. Thus, it is now adequate and necessary to incorporate these resonances in calculations of the elementary cross section for kaon production. There are some works which include such baryon resonances in kaon production stu...

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“…Fa 67/14-1 † Supported by GSI under contract No. 06 TÜ 736 0 Due to a long mean free path the K + meson is a good probe for highly compressed nuclear matter formed in heavy ion collisions [1]. K + production is sensitive to the nuclear equation of state (EOS) [2].…”

Section: Introductionmentioning

confidence: 99%

Resonance model of pi Delta to YK for kaon production in heavy-ion collisions

Tsushima¹,

Huang²,

Faessler³

1995

J. Phys. G: Nucl. Part. Phys.

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The elementary production cross sections π∆ → Y K (Y = Σ, Λ) and πN → Y K are needed to describe kaon production in heavy ion collisions. The πN → Y K reactions were studied previously by a resonance model. The model can explain the experimental data quite well [8]. In this article, the total cross sections π∆ → Y K at intermediate energies (from the kaon production threshold to 3 GeV of π∆ centerof-mass energy) are calculated for the first time using the same resonance model. (1 − ) vector meson exchange is included. The results show that K * (892) exchange is neglegible for the π∆ → ΣK reactions, whereas this meson does not contribute to the π∆ → ΛK reactions. Furthemore, the π∆ → Y K contributions to kaon production in heavy ion collisions are not only non-neglegible but also very different from the πN → Y K reactions. An argument valid for πN → Y K cannot be extended to π∆ → Y K reactions. Therefore, cross sections for π∆ → Y K including correctly the different isospins must be calculated to be included in simulation codes for kaon production in heavy ion collisions, where no experimental data are available. Parametrizations of the total cross sections π∆ → Y K for kaon production in heavy ion collisions are given based on this work. * Supported by DFG under contract No. Fa 67/14-1 † Supported by GSI under contract No. 06 TÜ 736 0 Due to a long mean free path the K + meson is a good probe for highly compressed nuclear matter formed in heavy ion collisions [1]. K + production is sensitive to the nuclear equation of state (EOS) [2]. Thus many studies of K + production in heavy ion collisions have been performed by theoretically and experimentally [1]- [7].However, in most theoretical studies of kaon production by either the VlasovUehling-Uhlenbeck approach (VUU) [9], or by "quantum" molecular dynamics (QMD) [10,11], the kaon elementry production cross sections parametrized by J. Randrup and C. M. Ko [6], and by J. Cugnon and R. M. Lombard [7] have been used. In these works, the amplitudes relevant for the elementary kaon production cross sections are not calculated. Due to the lack of data an average over isospin projections is used.Motivated by this fact, we presented for the first time parametrizations of the total cross sections πN → ΣK based on theoretical calculations [8]. The processes πN → Y K (Y = Σ, Λ) are the so-called secondary processes in heavy-ion collisions, which are known to give about a 30 % contribution to kaon production in heavy ion collisions [5]. It turned out that the model can explain the total cross sections πN → ΣK quite well [8].On the other hand, it was shown by W. Ehehalt. et al. [12] that the ∆'s in the central cell of the heavy ion collisions make up about 25 % of the baryons, whereas the nucleons represent about 60 % to 70 %. This relatively high amount of the ∆'s in heavy ion collisions is ascribed to the suppression of the decay ∆ → πN by Pauli blocking. This implies that the processes π∆ → Y K must also be taken into account for kaon production in heavy-ion collisio...

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Production ofK+Mesons in 2.1-GeV/Nucleon Nuclear Collisions

Cited by 103 publications

References 11 publications

ϕ decay: A relevant source forK−production at energies available at the GSI Schwerionen-Synchrotron (SIS)?

ϕ decay: A relevant source forK−production at energies available at the GSI Schwerionen-Synchrotron (SIS)?

The role of the Δ (1920) resonance for kaon production in heavy ion collisions

Resonance model of pi Delta to YK for kaon production in heavy-ion collisions

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