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Directed Flow of -Hyperons in 2-6 AGeV Au+Au Collisions
Directed flow measurements for -hyperons are presented and compared
to those for protons produced in the same Au+Au collisions (2, 4, and 6 AGeV;
fm). The measurements indicate that -hyperons flow
consistently in the same direction and with smaller magnitudes than those of
protons. Such a strong positive flow [for s] has been predicted in
calculations which include the influence of the -nucleon potential.
The experimental flow ratio /p is in qualitative agreement with
expectations () from the quark counting rule at 2 AGeV but is found
to decrease with increasing beam energy.Comment: 5 pages including 4 Figs. Submitted to Phys. Rev. Let