Observation of Different Azimuthal Emission Patterns of K+ and of K- Mesons in Heavy-Ion Collisions at 1–2A  GeV

Uhlig, F.; Förster, A.; Böttcher, I.; Dębowski, M.; Dohrmann, F.; Grosse, E.; Koczoń, P.; Kohlmeyer, B.; Laue, F.; Menzel, Matthias; Naumann, L.; Oeschler, H.; Scheinast, W.; Schwab, E.; Senger, P.; Shin, Y.; Ströbele, H.; Sturm, C.; Surówka, G.; Wagner, Andreas; Waluś, W.

doi:10.1103/physrevlett.95.012301

Cited by 37 publications

(18 citation statements)

References 25 publications

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“…However, the transverse momentum spectra of K + mesons become harder which is not supported by the experimental data. Though the v 2 of K + mesons-with the default kaon-nuclear potential of +25 MeV at ρ 0 -is smaller than with larger repulsive potential, our results qualitatively agree with the experimental data from the KaoS Collaboration [91]. However, as seen from Fig.…”

Section: Azimuthal Distributionssupporting

confidence: 88%

“…The azimuthal angular distributions of K + in semicentral Au+Au collisions at 1.5A GeV (upper) and in semi-central Ni+Ni collisions at 1.93A GeV (lower) in comparison to the experimental data from the KaoS Collaboration [91]. The solid lines show the calculations with medium effects, while the dashed lines display results without medium effects.…”

Section: E Multiplicity Dependence On a Part And On The Eosmentioning

confidence: 99%

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In-medium effects in strangeness production in heavy-ion collisions at (sub)threshold energies

et al. 2021

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We study the in-medium effects in strangeness production in heavy-ion collisions at (sub)threshold energies of (1-2)A GeV based on the microscopic Parton-Hadron-String Dynamics (PHSD) transport approach. The in-medium modifications of the antikaon ( K = K − , K0 ) properties are described via the self-consistent coupledchannel unitarized scheme based on a SU(3) chiral Lagrangian which incorporates explicitly the s and p waves of the kaon-nucleon interaction. This scheme provides the antikaon potential, spectral functions, and reaction cross sections as well as their dependence on baryon density, temperature, and antikaon momentum in the nuclear medium, which are incorporated in the off-shell dynamics of the PHSD. The in-medium modification of kaons (K = K + , K 0 ) are accounted via the kaon-nuclear potential, which is assumed to be proportional to the local baryon density. The manifestation of the medium effects in observables is investigated for the K and K rapidity distributions, p T spectra, the polar and azimuthal angular distributions, and directed (v 1 ) and elliptic (v 2 ) flows in C+C, Ni+Ni, and Au+Au collisions. We find-by comparison to experimental data from the KaoS, FOPI, and HADES Collaborations-that the modifications of (anti)kaon properties in nuclear matter are necessary to explain the data in a consistent manner. Moreover, we demonstrate the sensitivity of kaon observables to the equation of state of nuclear matter.

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Section: Azimuthal Distributionssupporting

confidence: 88%

Section: E Multiplicity Dependence On a Part And On The Eosmentioning

confidence: 99%

In-medium effects in strangeness production in heavy-ion collisions at (sub)threshold energies

et al. 2021

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“…Therefore, Ni+Ni collisions were performed at GSI with a beam energy of 1.93 A. The azimuthal angular distribution for π + , K + and K − mesons measured by the KaoS collaboration in semi-central Ni+Ni collisions are depicted in Figure 11 [46]. The distributions of π + and K + mesons are similar but less pronounced than in Au+Au collisions, which is expected for smaller spectator fragments.…”

Section: Kaon Productionmentioning

confidence: 99%

Pioneering the Equation of State of Dense Nuclear Matter with Strange Particles Emitted in Heavy-Ion Collisions: The KaoS Experiment at GSI

Senger

2022

Particles

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High-energy heavy-ion collisions offer the unique possibility to study fundamental properties of nuclear matter in the laboratory, which are relevant for our understanding of the structure of compact stellar objects and the dynamics of neutron star mergers. Of particular interest are the nuclear matter equation of state (EOS), the in-medium modifications of hadrons and the degrees of freedom of matter at high densities and temperatures. Pioneering experiments exploring the EOS for symmetric matter were performed at the SIS18 accelerator of GSI, measuring, as function of beam energy, the collective flow of protons and of light fragments and subthreshold strangeness production. These data were reproduced by various microscopic transport model calculations, providing, up to date, the best constraint for the EOS of symmetric matter with an incompressibility of about 200 MeV for densities up to twice the saturation density. This article reviews the experimental results on subthreshold kaon production together with the theoretical interpretation and gives a brief outlook towards future experiments at higher densities.

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“…For results obtained by the KaoS and the FOPI collaborations in analyses of the azimuthal anisotropy of the (anti)kaon emission and its sensitivity to the in-medium potentials we refer to [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Medium effects in proton-inducedK0production at 3.5 GeV

Agakishiev¹,

Arnold²,

Belver³

et al. 2014

Phys. Rev. C

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We present the analysis of the inclusive K 0 production in p + p and p + Nb collisions measured with the HADES detector (GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt) at a beam kinetic energy of 3.5 GeV. Data are compared to the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) transport model. The data suggest the presence of a repulsive momentum-dependent kaon potential as predicted by the chiral perturbation theory (ChPT). For the kaon at rest and at normal nuclear density, the ChPT potential amounts to ≈35 MeV. A detailed tuning of the kaon production cross sections implemented in the model has been carried out to reproduce the experimental data measured in p + p collisions. The uncertainties in the parameters of the model were examined with respect to the sensitivity of the experimental results from p + Nb collisions to the in-medium kaon potential.

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Observation of Different Azimuthal Emission Patterns of K+ and of K- Mesons in Heavy-Ion Collisions at 1–2A GeV

Cited by 37 publications

References 25 publications

In-medium effects in strangeness production in heavy-ion collisions at (sub)threshold energies

In-medium effects in strangeness production in heavy-ion collisions at (sub)threshold energies

Pioneering the Equation of State of Dense Nuclear Matter with Strange Particles Emitted in Heavy-Ion Collisions: The KaoS Experiment at GSI

Medium effects in proton-inducedK0production at 3.5 GeV

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