Sideward flow of K+ mesons in Ru+Ru and Ni+Ni reactions near threshold

Crochet, P.; Herrmann, N.; Wiśniewski, K.; Leifels, Y.; Andronic, A.; Averbeck, R.; Devismes, A.; Finck, C.; Gobbi, A.; Hartmann, O.; Hildenbrand, K. D.; Koczoń, P.; Kress, T.; Kutsche, R.; Reisdorf, W.; Schüll, D.; Alard, J. P.; Barret, V.; Basrak, Z.; Bastid, N.; Belyaev, I.; Bendarag, A.; Berek, G.; Čaplar, R.; Cindro, N.; Dupieux, P.; Dželalija, M.; Eskef, M.; Fodor, Z.; Grishkin, Y.; Hong, B.; Kecskeméti, J.; Kim, Y.J; Kirejczyk, M.; Korolija, M.; Kötte, R.; Kowalczyk, M.; Lebedev, A.; Lee, K.S; Manko, V.; Merlitz, Holger; Mohren, S.; Moisă, D.; Neubert, W.; Nianine, A.; Pelte, D.; Petrovici, M.; Plettner, C.; Rami, F.; Schauenburg, B. de; Seres, Z.; Sikora, B.; Sim, K. S.; Simion, V.; Siwek‐Wilczyńska, K.; Smolyankin, V.; Somov, A.; Stockmeier, M.; Stoicea, G.; Vasiliev, M. A.; Wagner, P.; Wohlfarth, D.; Yang, Jing; Yushmanov, I. E.; Zhilin, A.

doi:10.1016/s0370-2693(00)00712-7

Cited by 95 publications

(48 citation statements)

References 32 publications

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“…Near target rapidity K + -mesons show a collective in-plane deflection in the direction opposed to that of protons. This finding is in agreement with other data [18]. Models are able to describe this result when incorporating a slightly repulsive kaon nucleon (KN) potential of U pot,KN (ρ 0 , k = 0) ≈ 20 MeV, which is linearly depending on density (see Fig.…”

Section: Kaonssupporting

confidence: 92%

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: Kaonssupporting

confidence: 92%

Strangeness at high μ_B: Recent data from FOPI and HADES

Leifels

2018

EPJ Web Conf.

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“…24). The FOPI Collaboration measured also the p T dependence of v 1 in Ni+Ni and Ru+Ru reactions at spectator rapidities where a transition from anti-flow to flow with rising p T was observed [212]. Also these data require a repulsive in-medium potential as found in RBUU [212].…”

Section: In-plane Flowmentioning

confidence: 97%

Kaon production in heavy ion reactions at intermediate energies

Fuchs¹

2006

Progress in Particle and Nuclear Physics

302

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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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“…Here, the production rate depends strongly on multiple secondary interactions and is therefore escpecially sensitive to, hadronic production channels. The HADES [19][20][21][22] and FOPI [23][24][25][26] experiments at the SIS18 accelerator have recently measured strange particle yields from collisions of nuclei at beam energies of E lab = 1.76 and 1.23 A GeV, supplementing earlier KAOS measurements [27]. The purpose of this paper is to show how the hadronic transport model UrQMD can be extended to include most relevant strange hadron production mechanisms used to calculate strange particle ratios at beam energies where hyperons are produced below their p+p threshold.…”

Section: Introductionmentioning

confidence: 99%

Deep sub-thresholdΞandΛproduction in nuclear collisions with the UrQMD transport model

Graef

Steinheimer

et al. 2014

Phys. Rev. C

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We present results on deep sub threshold hyperon production in nuclear collisions, with the UrQMD transport model. Introducing anti-kaon+baryon and hyperon+hyperon strangeness exchange reactions we obtain a good description of experimental data on single strange hadron production in Ar+KCl reactions at E lab = 1.76 A GeV. We find that the hyperon strangeness exchange is the dominant process contributing to the Ξ − yield, however remains short of explaining the Ξ − /Λ ratio measured with the HADES experiment. We also discuss possible reasons for the discrepancy with previous studies and the experimental results, finding that many details of the transport simulation may have significant effects on the final Ξ − yield.

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Sideward flow of K+ mesons in Ru+Ru and Ni+Ni reactions near threshold

Cited by 95 publications

References 32 publications

Strangeness at high μ_B: Recent data from FOPI and HADES

Strangeness at high μ_B: Recent data from FOPI and HADES

Kaon production in heavy ion reactions at intermediate energies

Deep sub-thresholdΞandΛproduction in nuclear collisions with the UrQMD transport model

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Sideward flow of K+ mesons in Ru+Ru and Ni+Ni reactions near threshold

Cited by 95 publications

References 32 publications

Strangeness at high μB: Recent data from FOPI and HADES

Strangeness at high μB: Recent data from FOPI and HADES

Kaon production in heavy ion reactions at intermediate energies

Deep sub-thresholdΞandΛproduction in nuclear collisions with the UrQMD transport model

Contact Info

Product

Resources

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Strangeness at high μ_B: Recent data from FOPI and HADES

Strangeness at high μ_B: Recent data from FOPI and HADES