Observation of different azimuthal emission patterns of K+ and of K- mesons in heavy-ion collisions at 1-2 A GeV.
/ Authors
F. Uhlig, A. Förster, I. Böttcher, M. Dȩbowski, F. Dohrmann, E. Grosse, P. Koczoń, B. Kohlmeyer, F. Laue, M. Menzel
and 11 more authors
L. Naumann, H. Oeschler, W. Scheinast, E. Schwab, P. Senger, Y. Shin, H. Ströbele, C. Sturm, G. Surówka, A. Wagner, W. Waluś
/ Abstract
Azimuthal distributions of pi+, K+, and K- mesons have been measured in Au+Au reactions at 1.5A GeV and Ni+Ni reactions at 1.93 A GeV. In semicentral collisions at midrapidity, pi+ and K+ mesons are emitted preferentially perpendicular to the reaction plane in both collision systems. In contrast for K- mesons in Ni+Ni reactions, an in-plane elliptic flow was observed for the first time at these incident energies.
Journal: Physical review letters