Measurement of azimuthal asymmetries in inclusive production of hadron pairs in e(+)e(-) annihilation at Belle.
The Collins effect connects transverse quark spin with a measurable azimuthal dependence in the yield of hadronic fragments around the quark's momentum vector. Using two different reconstruction methods, we find evidence of statistically significant azimuthal asymmetries for charged pion pairs in e(+)e(-) annihilation at a center-of-mass energy of 10.52 GeV, which can be attributed to a transverse polarization of the primordial quarks. The measurement was performed using a sample of 79 x 10(6) hadronic events collected with the Belle detector.
Seidl
R
R
RIKEN BNL Research Center, Upton, New York 11973, USA.
Hasuko
K
K
Abe
K
K
Adachi
I
I
Aihara
H
H
Anipko
D
D
Asano
Y
Y
Aushev
T
T
Bakich
A M
AM
Balagura
V
V
Barberio
E
E
Bartel
W
W
Bay
A
A
Bitenc
U
U
Bizjak
I
I
Blyth
S
S
Bozek
A
A
Bracko
M
M
Browder
T E
TE
Chang
P
P
Chen
A
A
Cheon
B G
BG
Choi
Y
Y
Choi
Y K
YK
Chuvikov
A
A
Dalseno
J
J
Danilov
M
M
Dash
M
M
Dragic
J
J
Eidelman
S
S
Fratina
S
S
Gabyshev
N
N
Gershon
T
T
Go
A
A
Gokhroo
G
G
Golob
B
B
Gorisek
A
A
Grosse Perdekamp
M
M
Ha
H C
HC
Hayasaka
K
K
Hayashii
H
H
Hazumi
M
M
Hokuue
T
T
Hoshi
Y
Y
Hou
S
S
Hou
W-S
WS
Iijima
T
T
Inami
K
K
Ishikawa
A
A
Itoh
R
R
Iwasaki
M
M
Iwasaki
Y
Y
Kang
J H
JH
Kapusta
P
P
Katayama
N
N
Kawai
H
H
Kawasaki
T
T
Khan
H R
HR
Kichimi
H
H
Kim
S K
SK
Kim
S M
SM
Kulasiri
R
R
Kumar
R
R
Kuo
C C
CC
Kuzmin
A
A
Kwon
Y-J
YJ
Lange
J S
JS
Lee
J
J
Lesiak
T
T
Li
J
J
Limosani
A
A
Lin
S-W
SW
Liventsev
D
D
Mandl
F
F
Matsumoto
T
T
Matyja
A
A
Mitaroff
W
W
Miyake
H
H
Miyata
H
H
Miyazaki
Y
Y
Mizuk
R
R
Mori
T
T
Nakamura
I
I
Nakano
E
E
Nakao
M
M
Natkaniec
Z
Z
Nishida
S
S
Nitoh
O
O
Ogawa
A
A
Ogawa
S
S
Ohshima
T
T
Okabe
T
T
Okuno
S
S
Olsen
S L
SL
Ozaki
H
H
Pakhlov
P
P
Palka
H
H
Park
C W
CW
Park
H
H
Parslow
N
N
Peak
L S
LS
Pestotnik
R
R
Piilonen
L E
LE
Sakai
Y
Y
Sato
N
N
Satoyama
N
N
Schietinger
T
T
Schneider
O
O
Schümann
J
J
Senyo
K
K
Sevior
M E
ME
Shapkin
M
M
Shibuya
H
H
Somov
A
A
Soni
N
N
Stamen
R
R
Stanic
S
S
Staric
M
M
Sumisawa
K
K
Takasaki
F
F
Tamai
K
K
Tanaka
M
M
Taylor
G N
GN
Teramoto
Y
Y
Tian
X C
XC
Tsukamoto
T
T
Uehara
S
S
Uglov
T
T
Uno
S
S
Urquijo
P
P
Usov
Y
Y
Varner
G
G
Villa
S
S
Wang
C C
CC
Wang
C H
CH
Watanabe
Y
Y
Won
E
E
Xie
Q L
QL
Yabsley
B D
BD
Yamaguchi
A
A
Yamashita
Y
Y
Yamauchi
M
M
Ying
J
J
Yusa
Y
Y
Zhang
L M
LM
Zhang
Z P
ZP
Zhilich
V
V
Zürcher
D
D