Directed flow of Lambda hyperons in (2-6)A GeV Au+Au collisions

Authors
Chung, P Ajitanand, NN Alexander, JM Anderson, M Best, D Brady, FP Case, T Caskey, W Cebra, D Chance, JL Cole, B Crowe, K Das, A Draper, JE Gilkes, ML Gushue, S Heffner, M Hirsch, AS Hjort, EL Huo, L Justice, M Kaplan, M Keane, D Kintner, JC Klay, J Krofcheck, D Lacey, RA Lauret, J Lisa, MA Liu, H Liu, YM McGrath, R Milosevich, Z Odyniec, G Olson, DL Panitkin, SY Pinkenburg, C Porile, NT Rai, G Ritter, HG Romero, JL Scharenberg, R Schroeder, L Srivastava, B Stone, NTB Symons, TJM Wienold, T Witt, R Whitfield, J Wood, L Zhang, WN
Citation
P. Chung et al., Directed flow of Lambda hyperons in (2-6)A GeV Au+Au collisions, PHYS REV L, 86(12), 2001, pp. 2533-2536
Citations number
33
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
86
Issue
12
Year of publication
2001
Pages
2533 - 2536
Database
ISI
SICI code
0031-9007(20010319)86:12<2533:DFOLHI>2.0.ZU;2-1
Abstract
Directed flow measurements for Lambda hyperons are presented and compared t o those for protons produced in the same Au + Au collisions (2A, 4A, and 6A GeV; b < 5 - 6 fm). The measurements indicate that Lambda hyperons flow co nsistently in the same direction but with smaller magnitudes. A strong posi tive flow [for ns] has been predicted in calculations which include the inf luence of the Lambda -nucleon potential. The experimental flow ratio hip is in qualitative agreement with expectations (similar to2/3) from the quark counting rule at 2A GeV but is found to decrease with increasing beam energ y.