Yuji Koike (Niigata Univ.)

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Presentation transcript:

Yuji Koike (Niigata Univ.) Single Transverse Spin Asymmetry in QCD Yuji Koike (Niigata Univ.) 9th Circum-Pan-Pacific Symposium on High Energy Spin Physics Oct. 28~31 , 2013, Ji’nan, China

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

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

Qiu, Sterman (‘99), Kouvaris et.al.(‘06),Kanazawa,Koike(‘10) Kang, Yuan, Zhou (‘10), Metz, Pitonyak,(‘12) Kanazawa, Koike (‘00) ⇒ The 3rd term can be ignored. - Graphical representation of the 1st and 2nd terms : In this process, there are three nonperturbative functions. So, the twist-3 contributions to the spin dependent cross-section are obtaind by replacing a twist-2 distribution or fragmentation function by corresponding twist-3 distribution of fragmentation functions. So, two resaonable contribution to the SSA. The calculation is implete.

- Reasonable description of SSA for pions and kaons with this formula: Koike-Tomita (2009) Kouvaris-Qiu-Vogelsang-Yuan (2006) - Reasonable description of SSA for pions and kaons with this formula: KK-Koike (2010)

★ STAR (2008)

★ Decomposition of the asymmetries into each fragmentation channel - The difference comes from the strange components.