Directed flow of lambda hyperons in (2-6 )A GeV Au+Au collisions.
Directed flow measurements for Lambda 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 Lambda hyperons flow consistently in the same direction but with smaller magnitudes. A strong positive flow [for Lambdas] 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 (approximately 2/3) from the quark counting rule at 2A GeV but is found to decrease with increasing beam energy.
Chung
P
P
Ajitanand
N N
NN
Alexander
J M
JM
Anderson
M
M
Best
D
D
Brady
F P
FP
Case
T
T
Caskey
W
W
Cebra
D
D
Chance
J L
JL
Cole
B
B
Crowe
K
K
Das
A
A
Draper
J E
JE
Gilkes
M L
ML
Gushue
S
S
Heffner
M
M
Hirsch
A S
AS
Hjort
E L
EL
Huo
L
L
Justice
M
M
Kaplan
M
M
Keane
D
D
Kintner
J C
JC
Klay
J
J
Krofcheck
D
D
Lacey
R A
RA
Lauret
J
J
Lisa
M A
MA
Liu
H
H
Liu
Y M
YM
McGrath
R
R
Milosevich
Z
Z
Odyniec
G
G
Olson
D L
DL
Panitkin
S Y
SY
Pinkenburg
C
C
Porile
N T
NT
Rai
G
G
Ritter
H G
HG
Romero
J L
JL
Scharenberg
R
R
Schroeder
L
L
Srivastava
B
B
Stone
N T
NT
Symons
T J
TJ
Wienold
T
T
Witt
R
R
Whitfield
J
J
Wood
L
L
Zhang
W N
WN