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

P. Chung; N. N. Ajitanand; J. M. Alexander; M. Anderson; D. Best; F. P. Brady; T. Case; W. Caskey; 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

doi:10.1103/physrevlett.86.2533

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

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Abstract

Directed flow measurements for $Λ$-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 $Λ$-hyperons flow consistently in the same direction and with smaller magnitudes than those of protons. Such a strong positive flow [for $Λ$s] 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 ($\sim 2/3$) from the quark counting rule at 2 AGeV but is found to decrease with increasing beam energy.

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P. Chung, N. N. Ajitanand, J. M. Alexander, M. Anderson, D. Best, F. P. Brady, T. Case, W. Caskey, 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. 2001-01-06. Directed Flow of $Λ$-Hyperons in 2-6 AGeV Au+Au Collisions. https://doi.org/10.1103/physrevlett.86.2533

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