Phys. Rev. Lett. 86, 2533–2536 (2001)Directed Flow of Λ Hyperons in (2–6 )A GeV Au+Au CollisionsReceived 1 August 2000; published in the issue dated 19 March 2001 Directed flow measurements for Λ hyperons are presented and compared to those for protons produced in the same Au+Au collisions (2A, 4A, and 6A GeV; b<5-6 fm). The measurements indicate that Λ hyperons flow consistently in the same direction but with smaller magnitudes. A strong positive flow [for Λs] has been predicted in calculations which include the influence of the Λ-nucleon potential. The experimental flow ratio Λ/p is in qualitative agreement with expectations ( ∼2/3) from the quark counting rule at 2A GeV but is found to decrease with increasing beam energy. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.2533
DOI:
10.1103/PhysRevLett.86.2533
PACS:
25.75.Ld, 13.75.Ev, 25.70.Pq
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