Measurement of angular distributions of Drell-Yan dimuons in p+d interactions at 800 GeV/c.
We report a measurement of the angular distributions of Drell-Yan dimuons produced using an 800 GeV/c proton beam on a deuterium target. The muon angular distributions in the dilepton rest frame have been measured over the kinematic range 4.5<m{mu mu}<15 GeV/c{2}, 0<p{T}<4 GeV/c, and 0<x{F}<0.8. No significant cos2phi dependence is found in these proton-induced Drell-Yan data, in contrast with the situation for pion-induced Drell-Yan data. The data are compared with expectations from models which attribute the cos2phi distribution to a QCD vacuum effect or to the presence of the transverse-momentum-dependent Boer-Mulders structure function h{1}{perpendicular}. Constraints on the magnitude of the sea-quark h{1}{perpendicular} structure functions are obtained.
Zhu
L Y
LY
University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Peng
J C
JC
Reimer
P E
PE
Awes
T C
TC
Brooks
M L
ML
Brown
C N
CN
Bush
J D
JD
Carey
T A
TA
Chang
T H
TH
Cooper
W E
WE
Gagliardi
C A
CA
Garvey
G T
GT
Geesaman
D F
DF
Hawker
E A
EA
He
X C
XC
Isenhower
L D
LD
Kaplan
D M
DM
Kaufman
S B
SB
Klinksiek
S A
SA
Koetke
D D
DD
Lee
D M
DM
Lee
W M
WM
Leitch
M J
MJ
Makins
N
N
McGaughey
P L
PL
Moss
J M
JM
Mueller
B A
BA
Nord
P M
PM
Papavassiliou
V
V
Park
B K
BK
Petitt
G
G
Sadler
M E
ME
Sondheim
W E
WE
Stankus
P W
PW
Thompson
T N
TN
Towell
R S
RS
Tribble
R E
RE
Vasiliev
M A
MA
Webb
J C
JC
Willis
J L
JL
Wise
D K
DK
Young
G R
GR
D003903:Deuterium; D019471:Elementary Particle Interactions; D008651:Mesons; D008962:Models, Theoretical; D009038:Motion; D009686:Nuclear Physics; D011522:Protons
D011522:Protons; D003903:Deuterium