Azimuthal emission patterns of K+ and of K- mesons in Ni plus Ni collisions near the strangeness production threshold

Zinyuk, V. and Kang, T. I. and Leifels, Y. and Herrmann, N. and Hong, B. and Averbeck, R. and Andronic, A. and Barret, V. and Basrak, Z. and Bastid, N. and Benabderrahmane, M. L. and Berger, M. and Buehler, P. and Cargnelli, M. and Caplar, R. and Carevic, I. and Crochet, P. and Deppner, I. and Dupieux, P. and Dzelalija, M. and Fabbietti, L. and Fodor, Zoltán and Gasik, P. and Gasparic, I. and Grishkin, Y. and Hartmann, O. N. and Hildenbrand, K. D. and Kecskeméti, József and Kim, Y. J. and Kirejczyk, M. and Seres, Zoltán (2014) Azimuthal emission patterns of K+ and of K- mesons in Ni plus Ni collisions near the strangeness production threshold. PHYSICAL REVIEW C, 90 (2). ISSN 2469-9985

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Abstract

Azimuthal emission patterns of K± 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 pT inte- grated directed and elliptic flow of K+ and K− mesons as well as the centrality dependence of pT - 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 po- tential, repulsive for K+ mesons and attractive for K− mesons.

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