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 integrated 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 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.
| Original language | English |
|---|---|
| Article number | 025210 |
| Journal | Physical Review C - Nuclear Physics |
| Volume | 90 |
| Issue number | 2 |
| DOIs | |
| State | Published - 25 Aug 2014 |
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