Non-resonant kaon pair production and medium effects in proton–nucleus collisions

Paryev, É. Ya.; Hartmann, Michael; Kiselev, Yu.T.

doi:10.1088/0954-3899/42/7/075107

Cited by 8 publications

(2 citation statements)

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“…One possibility is to investigate correlated K + K − production in elementary and heavy-ion reactions and exclude the φ from the analysis. Such a procedure has been suggested by the ANKE collaboration [29]. Additional high statistics data of strangeness production as a function of energy and system size is necessary for continuing such type of analyses and constraining further the input parameters in the microscopic models.…”

Section: Resultsmentioning

confidence: 99%

Strangeness at high μ_B: Recent data from FOPI and HADES

Leifels

2018

EPJ Web Conf.

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Abstract. Strangeness production in heavy-ion reactions at incident energies at or below the threshold in NN collisions gives access to the characteristics of bulk nuclear matter and the properties of strange particles inside the hot and dense nuclear medium, like potentials and interaction cross sections. At these energies strangeness is produced in multi-step processes potentially via excitation of intermediate heavy resonances. The amount of experimental data on strangeness production at these energies has increased substantially during the last years due to the FOPI and the HADES experiments at SIS18 at GSI. Experimental data on K + and K 0 production support the assumption that particles with ans quark feel a moderate repulsive potential in the nuclear medium. The situation is not that clear in the case of K − . Here, spectra and flow of K − mesons is influenced by the contribution of φ mesons which are decaying into K + K − pairs with a branching ratio of 48.9 %. Depending on incident energy upto 30 % of all K − mesons measured in heavyion collisions are originating from φ-decays. Strangeness production yields -except the yield of Ξ − -are described by thermal hadronisation models. Experimental data not only measured for heavy-ion collisions but also in proton induced reactions are described with sets of temperature T and baryon chemical potential µ B which are close to a universal freeze-out curve which is fitting also experimental data obtained at lower baryon chemical potential. Despite the good description of most particle production yields, the question how this is achieved is still not settled and should be the focus of further investigations.

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Section: Resultsmentioning

confidence: 99%

Strangeness at high μ_B: Recent data from FOPI and HADES

Leifels

2018

EPJ Web Conf.

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“…Contrary, the K − meson (K − = sū) properties in nuclear matter are more complex and less known. Several effects compete, the antikaon can be rescattered or be absorbed by nucleons and form baryonic resonances leading to the modification of its in-medium properties [2] [3]. This absorption strangeness exchange reaction can occur on one (K − N → Yπ) or more nucleons (K − NN → YNπ).…”

Section: Introductionmentioning

confidence: 99%

Kaon and Phi Production in Pion-Nucleus Reactions at 1.7 GeV/c

Wirth

2018

EPJ Web Conf.

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Abstract. The production and properties of K + , K − and φ in nuclear reactions π − + A (A = C, W) at a beam momentum of 1.7 GeV/c has been studied with the HADES setup at SIS18/GSI. Of particular interest is the K − absorption in nuclear matter which should be driven by strangeness exchange processes on one (K − N → Yπ) or more nucleons (K − NN → YNπ). In this context, also the φ has to be taken into account, since φ decays into K + K − pairs may substantially affect the measured K − abundance. A solid reference is needed to evaluate the K − absorption with in the nucleus and in this work we discuss the determination of this reference. A double ratio of K − /K + (W)/K − /K + (C) is measured within the acceptance and compared to the reference.

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