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

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arxiv nucl-ex/0101002 v1 pith:UB4YCD7V submitted 2001-01-06 nucl-ex

P.Chung , N.N.Ajitanand , J.M.Alexander , M.Anderson , D.Best , F.P.Brady , T.Case , W.Caskey
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D.Cebra J.L.Chance B.Cole K.Crowe A.Das J.E.Draper M.L.Gilkes S.Gushue M.Heffner A.S.Hirsch E.L.Hjort L.Huo M.Justice M.Kaplan D.Keane J.C.Kintner J.Klay D.Krofcheck R.A.Lacey J.Lauret M.A.Lisa H.Liu Y.M.Liu R.McGrath Z.Milosevich G.Odyniec D.L.Olson S.Y.Panitkin C.Pinkenburg N.T.Porile G.Rai H.G.Ritter J.L.Romero R.Scharenberg L.Schroeder B.Srivastava N.T.BStone T.J.M.Symons T.Wienold R.Witt J.Whitfield L.Wood W.N.Zhang
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abstract

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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  1. Impact of particle production mechanisms on pseudorapidity distribution and directed flow in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ = 19.6 GeV using AMPT model

    nucl-th 2025-06 conditional novelty 4.0 of 10

    String fragmentation parameters in the AMPT model change proton directed flow and its system-size dependence at 19.6 GeV, while leaving pions nearly unaffected.

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