偏極ビーム・標的による
Drell-Yan過程での
スピン観測量と核子構造
田中和廣 (順天堂大)

X

DIS:  p    X
SIDIS:  p      X
The first global fit at LO
Anselmino et al., PRD75 (’07) 054032
arXiv: 0807.0173
T q  x   0
no data for x  0.4
Drell-Yan: p  p 


X
Q2
d  d
ATT 


d  d



2
2
2
2
2

e

q
(
x
,
Q
)

q
(
x
,
Q
)


q
(
x
,
Q
)

q
(
x
,
Q
)  
 q T 1
T
2
T
1
T
2
q
2
2
2
2
2

e
q
(
x
,
Q
)
q
(
x
,
Q
)

q
(
x
,
Q
)
q
(
x
,
Q
)  
 q 1
2
1
2
q

J-PARC:

p p 
ATT 


S  10 GeV, x1,2  0.1
X
2
2
2
2
2

e

q
(
x
,
Q
)

q
(
x
,
Q
)


q
(
x
,
Q
)

q
(
x
,
Q
)  
 q T 1
T
2
T
1
T
2
q
2
2
2
2
2

e
q
(
x
,
Q
)
q
(
x
,
Q
)

q
(
x
,
Q
)
q
(
x
,
Q
)  
 q 1
2
1
2
q
GSI:
S
6 GeV, x1,2  0.2
QT
Kawamura, Kodaira, Tanaka,
NPB777 (’07) 203
resummation
PTP 118 (’07) 581
PLB662 (’08) 139
Q2 , y
@ J-PARC
Q  2 GeV, y=0
@ GSI
S  14.5 GeV, Q  4 GeV, y=0
@ J-PARC
@ RHIC
S  500 GeV, y=2
d  d
ALT 


d  d



2
2
q
2
q
2
2

e

q
(
x
,
Q
)
x
g
(
x
,
Q
)

x
h
(
x
,
Q
)

q
(
x
,
Q
)   x1  x 2  
 q 1
2 T
2
1 L
1
T
2
q
2
2
2

e
q
(
x
,
Q
)
q
(
x
,
Q
)   x1  x 2  
 q 1
2
q
hL , gT : twist-3 parton distributions
2

q
(
y
,
Q
)
q
2
T
hL ( x , Q )  2 x  dy
 "genuine twist-3"
2
x
y
1
2

q
(
y
,
Q
)
q
2
gT ( x , Q )   dy
 "genuine twist-3"
x
y
1
Wandzura-Wilczek part
@J-PARC
S  10 GeV
(from presentation by S. Yoshida)
x F  x1  x2
@GSI
S  6.7 GeV
(Koike, Tanaka, Yoshida, arXiv:0805.2289)
Summary
Drell-Yan processes using
polarized beam and target
at J-PARC
ALL
q ( x )
ATT
T q( x ), T q ( x )
ALT
qqg three-body correlation
including large x region
Clean! unique!!