Kaon production at subthreshold energies

Hartnack, C.; Jaenicke, J.; Sehn, L.; Stöcker, H.; Aichelin, J.

doi:10.1016/0375-9474(94)90786-2

Cited by 98 publications

(126 citation statements)

References 39 publications

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“…The form factors suppress the contributions of high momenta and the parameter λ i , which governs the range of suppression, can be related to the hadron size. Since N N elastic scattering cross sections decrease gradually with the beam energy (beyond certain value), we take energy dependent meson-nucleon coupling constants of the following form 9) in order to reproduce these data in the entire range of beam energies. The parameters, g 0 , λ and ℓ were determined by fitting to the elastic proton-proton and proton-neutron scattering data at the beam energies in the range of 400 MeV to 4.0 GeV [30,33].…”

Section: Formalismmentioning

confidence: 99%

“…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%

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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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Section: Formalismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

pp→pK+Λreaction in an effective Lagrangian model

Shyam

1999

Phys. Rev. C

128

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“…The systematic study of K ± subthreshold production yields, phase space distributions, and flow observables in relativistic heavy-ion collisions at various beam energies and for various system sizes and centralities has attracted much attention, in particular in the context of in-medium properties of K + and K − mesons [1][2][3][4][5][6][7][8][9][10]. 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].…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, the combined analysis of K + and K − suggests that a substantial part of the observed K − mesons is due to a strangeness exchange mechanism [33]. Furthermore K + and K − exhibit distinctively different in-medium properties, both in theoretical approaches [1][2][3][4][5][6][7][8][9][10][31][32][33][34] and in experiments [11][12][13]15,18,19,22].…”

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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“…Especially the relation of the optical potential of K + and K − in the nuclear medium to experimental observables like the K − /K + ratios, mesonic in-plane flow and azimuthal distribution of kaons is subject of vivid discussions, who have triggered a lot of activities on the experimental [1,2,3,4,5,6,7,8,9,10] and theoretical side [11,12,13,14,15,16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%