<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>production in baryon-baryon and heavy-ion collisions

Gq, Li; Ko, Che Ming; Chung, W.

doi:10.1103/physrevc.57.434

Cited by 20 publications

(25 citation statements)

References 32 publications

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“…Since no experimental data exist for cross sections involving nucleon resonances one has here to rely on model calculations. Commonly used parameterizations are based on one-boson-exchange models [97,98] or on more microscopic one-boson-exchange + resonance models [99,100,101,102]. Both models are usually applied at the tree level.…”

Section: Elementary Reaction Channelsmentioning

confidence: 99%

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Kaon production in heavy ion reactions at intermediate energies

Fuchs¹

2006

Progress in Particle and Nuclear Physics

301

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The article reviews the physics related to kaon and antikaon production in heavy ion reactions at intermediate energies. Chiral dynamics predicts substantial modifications of the kaon properties in a dense nuclear environment. The status of the theoretical predictions as well as experimental evidences for medium effects such as repulsive/attractive mass shifts for K + /K − are reviewed. In the vicinity of the thresholds, and even more pronounced below threshold, the production of strangeness is a highly collective process. Starting from elementary reaction channels the phenomenology of K + and K − production, i.e. freeze-out densities, time scales etc. as derived from experiment and theoretical transport calculations is presented. Below threshold kaon production shows a high sensitivity on the nuclear compression reached in heavy ion reactions. This allows to put constraints on the nuclear equation-of-state which are finally discussed.

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Section: Elementary Reaction Channelsmentioning

confidence: 99%

“…The cross sections are derived within the resonance model in Born approximation, including all baryonic resonances with masses below 2 GeV as intermediate states. In the meantime they are standardly and applied in most transport calculations [116,183,25,39,154,98,184,96].…”

Section: Elementary Cross Sectionsmentioning

confidence: 99%

Kaon production in heavy ion reactions at intermediate energies

Fuchs¹

2006

Progress in Particle and Nuclear Physics

301

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“…1. While the exchange of the lightest mesons, namely π and K + , is expected to be dominant in the Λ and Σ 0 production [1,2,3,4,5,6,7] there could be also a contribution arising from the exchange of heavier non-strange or strange mesons [8,9,10,11]. In addition, proton-hyperon final state interactions (FSI) play an important role when comparing the pK + Λ and pK + Σ 0 reaction channels.…”

Section: Introductionmentioning

confidence: 99%

Energy dependence of the Λ/Σproduction cross-section ratio in p-p interactions

Kowina

Wolke²,

Adam³

et al. 2004

Eur. Phys. J. A

112

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Abstract. The production of the Λ and Σ 0 hyperons has been measured via the pp → pK + Λ/Σ 0 reaction at the internal COSY-11 facility in the excess energy range between 14 and 60 MeV. The transition of the Λ/Σ 0 cross section ratio from about 28 at Q ≤ 13 M eV to the high energy level of about 2.5 is covered by the data showing a strong decrease of the ratio between 10 and 20 MeV excess energy. Effects from the final state interactions in the p − Σ 0 channel seems to be much smaller compared to the p − Λ one. Estimates of the effective range parameters are given for the N Λ and the N Σ systems.

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“…The elementary nucleon-nucleon-strange meson production cross sections are the most important ingredients in the transport model studies of the K + -meson production in the nucleus-nucleus collisions, which provide information on not only the initial collision dynamics but also the nuclear equation of state at high density [5][6][7][8][9][10][11][12]. Furthermore, the enhancement in the strangeness production has been proposed as a signature for the formation of the quark-gluon plasma in high energy nucleus-nucleus collisions [13,14].…”

Section: Introductionmentioning

confidence: 99%

pp→pK+Λreaction in an effective Lagrangian model

Shyam

1999

Phys. Rev. C

128

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We investigate the pp → pK + Λ reaction within an effective Lagrangian model where the contributions to the amplitudes are taken into account within the tree level. The initial interaction between the two nucleons is modeled by the exchange of π, ρ, ω and σ mesons and the ΛK + production proceeds via the excitation of the N * (1650), N * (1710), N * (1720) baryonic resonances. The parameters of the model at the nucleon-nucleon-meson vertices are determined by fitting the elastic nucleon-nucleon scattering with an effective interaction based on the exchange of these four mesons, while those at the resonance vertices are calculated from the known decay widths of the resonances as well as the vector meson dominance model. Available experimental data is described well by this approach. The one-pion-exchange diagram dominates the production process at both higher and lower beam energies. The ρ and ω meson exchanges make negligible contributions. However, the σ-exchange processes contribute substantially to the total cross sections at lower beam energies. The excitation of the N * (1710) and N * (1650) resonances dominate this reaction at beam momenta above and below 3 GeV/c respectively. The interference among the amplitudes of various resonance excitation processes is significant. For beam energies very close to the K + production threshold the hyperon-proton final state interaction effects are quite important. The data is selective about the model used to describe the low energy scattering of the two final state baryons.

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K+production in baryon-baryon and heavy-ion collisions

Cited by 20 publications

References 32 publications

Kaon production in heavy ion reactions at intermediate energies

Kaon production in heavy ion reactions at intermediate energies

Energy dependence of the Λ/Σproduction cross-section ratio in p-p interactions

pp→pK+Λreaction in an effective Lagrangian model

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