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

作者：Zinyuk, V.^*; Kang, T. I.; Leifels, Y.; Herrmann, N.; Hong, B.; Averbeck, R.; Andronic, A.; Barret, V.; Basrak, Z.; Bastid, N.; Benabderrahmane, M. L.; Berger, M.; Buehler, P.; Cargnelli, M.; Caplar, R.; Carevic, I.; Crochet, P.; Deppner, I.; Dupieux, P.; Dzelalija, M.; Fabbietti, L.; Fodor, Z.; Gasik, P.; Gasparic, I.; Grishkin, Y.; Hartmann, O. N.; Hildenbrand, K. D.; Kecskemeti, J.; Kim, Y. J.; Kirejczyk, M.; Kis, M.; Koczon, P.; Kotte, R.; Lebedev, A.; Le Fevre, A.; Liu, J. L.

来源：Physical Review C, 2014, 90(2): 025210.

DOI：10.1103/PhysRevC.90.025210

• HEAVY-ION COLLISIONS
• ANTIKAON PRODUCTION
• NUCLEAR COLLISIONS
• KAON PRODUCTION
• DENSE NUCLEAR
• SIS ENERGIES
• FLOW
• 1A

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 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 hadron string dynamics and isospin quantum molecular dynamics 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.

• 出版日期2014-8-25
• 单位哈尔滨工业大学; 中国科学院近代物理研究所; 清华大学