Antiflow of K(0)(s) mesons in 6A GeV Au + Au collisions

Phys Rev Lett. 2000 Jul 31;85(5):940-3. doi: 10.1103/PhysRevLett.85.940.

Abstract

We have measured the sideward flow of neutral strange ( K(0)(s)) mesons in 6A GeV Au+Au collisions. A prominent antiflow signal is observed for an impact parameter range ( b less, similar7 fm) which spans central and midcentral events. Since the K(0)(s) scattering cross section is relatively small in nuclear matter, this observation suggests that the in-medium kaon vector potential plays an important role in high density nuclear matter.