Directed Flow of $Λ$-Hyperons in 2-6 AGeV Au+Au Collisions

Details Directed Flow of $Λ$-Hyperons in 2-6 AGeV Au+Au Collisions Directed Flow of $Λ$-Hyperons in 2-6 AGeV Au+Au Collisions

2001-01-06

arxiv.org/abs/nucl-ex/0101002v1

Phys.Rev.Lett.86:2533-2536,2001

Physics

Nuclear Physics

Nuclear Experiment

5 pages including 4 Figs. Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.86.2533

Directed flow measurements for $\Lambda$-hyperons are presented and compared to those for protons produced in the same Au+Au collisions (2, 4, and 6 AGeV; $b < 5 - 6$ fm). The measurements indicate that $\Lambda$-hyperons flow consistently in the same direction and with smaller magnitudes than those of protons. Such a strong positive flow [for $\Lambda$s] has been predicted in calculations which include the influence of the $\Lambda$-nucleon potential. The experimental flow ratio $\Lambda$/p is in qualitative agreement with expectations ($\sim 2/3$) from the quark counting rule at 2 AGeV but is found to decrease with increasing beam energy.

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