# Azimuthal Emission Patterns of $K^{+}$ and of $K^{-}$ Mesons in Ni + Ni Collisions near the Strangeness Production Threshold

Abstract : Azimuthal emission patterns of $K^\pm$ mesons have been measured in Ni + Ni collisions with the FOPI spectrometer at a beam kinetic energy of 1.91 A GeV. The transverse momentum $p_{T}$ integrated directed and elliptic flow of $K^{+}$ and $K^{-}$ mesons as well as the centrality dependence of $p_{T}$ - differential directed flow of $K^{+}$ mesons are compared to the predictions of HSD and IQMD transport models. The data exhibits different propagation patterns of $K^{+}$ and $K^{-}$ mesons in the compressed and heated nuclear medium and favor the existence of a kaon-nucleon in-medium potential, repulsive for $K^{+}$ mesons and attractive for $K^{-}$ mesons.
Document type :
Journal articles

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Submitted on : Thursday, March 13, 2014 - 10:05:51 AM
Last modification on : Thursday, December 16, 2021 - 2:10:33 PM

### Citation

V. Zinyuk, T. I. Kang, Y. Leifels, N. Herrmann, B. Hong, et al.. Azimuthal Emission Patterns of $K^{+}$ and of $K^{-}$ Mesons in Ni + Ni Collisions near the Strangeness Production Threshold. Physical Review C, American Physical Society, 2014, 90 (2), pp.025210. ⟨10.1103/PhysRevC.90.025210⟩. ⟨in2p3-00958656⟩

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