Azimuthal Emission Patterns of K⁺ and of K⁻ Mesons in Ni + Ni Collisions near the Strangeness Production Threshold

V. Zinyuk , T.I. Kang , Y. Leifels , N. Herrmann , B. Hong , R. Averbeck , A. Andronic , V. Barret

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Z. Basrak N. Bastid M.L. Benabderrahmane M. Berger P. Buehler M. Cargnelli R. \v{C}aplar I. Carevic P. Crochet I. Deppner P. Dupieux M. D\v{z}elalija L. Fabbietti Z. Fodor P. Gasik I. Ga\v{s}pari\'c Y. Grishkin O.N. Hartmann K.D. Hildenbrand J. Kecskemeti Y.J. Kim M. Kirejczyk M. Ki\v{s} P. Koczon R. Kotte A. Lebedev A. Le F\`evre J.L. Liu X. Lopez V. Manko J. Marton T. Matulewicz R. M\"unzer M. Petrovici K. Piasecki F. Rami A. Reischl W. Reisdorf M.S. Ryu P. Schmidt A. Sch\"uttauf Z. Seres B. Sikora K.S. Sim V. Simion K. Siwek- ilczy\'nska V. Smolyankin K. Suzuki Z. Tyminski P. Wagner E. Widmann K. Wi\'sniewski Z.G. Xiao I. Yushmanov Y. Zhang A. Zhilin J. Zmeskal (FOPI Collaboration)

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classification ⚛️ nucl-ex

keywords mesonspatternsazimuthalcollisionsdirectedemissionflowattractive

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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.

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Azimuthal Emission Patterns of K⁺ and of K⁻ Mesons in Ni + Ni Collisions near the Strangeness Production Threshold

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