1. Recent development in twist-3 spin observable studies
Y. Koike (Niigata University)
第９回　高エネルギーＱＣＤ・核子構造勉強会
@理研（和光），August 8, 2016

6. FNAL-E704
P.L. B264 (’91) 462
P.L. B261 (’91) 201

13. ★ RHIC-STAR (‘04) ★ RHIC-BRAHMS (‘07)
First, we have to confirm the validity of the perturbative calculation .

14. - Graphical representation of the 1st , 2nd and 3rd terms :
Qiu, Sterman (‘99), Kouvaris
et.al.(‘06), Kanazawa-YK(‘10)
Beppu,YK,Kanazawa,Yoshida(‘13)
Kang, Yuan, Zhou (‘10), Metz,
Pitonyak (‘12) ,Kanazawa,YK,Metz,
Pitonyak (’14)
Kanazawa, Koike (‘00)
⇒ The last term can be ignored.
- Graphical representation of the 1st , 2nd and 3rd terms :

32. Qiu, Sterman (‘92), Kouvaris et.al.(‘06),
Kang et al (‘12), Kanazawa-YK(‘12),..