1. Yuji Koike (Niigata Univ.)
Single transverse spin asymmetry in pp collisions:
new results from twist-3 mechanism
Yuji Koike (Niigata Univ.)
Gluons and the quark sea at high energies:
distributions, polarization, tomography
Nov. 11, 2010 , INT, U. of Washington

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

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

26. 26

29. (Qiu&Sterman’99)
(Kanazawa&Koike’00)
(A)
:Hard part

35. Results for pion
- Three fits well reproduce the SSA for pions.

36. Results for kaon
- FIT.2 (Omission of SFP) fail to reproduce the AN(K-)
← not good.

41. Decomposition of SGP and SFP in FIT 1
- The SGP effect is dominant.

42. Flavor decomposition for charged pion in FIT.1
SGP
SFP
- Valence components of the SGP effect are dominant for each hadron.

43. Flavor decomposition for charged kaon in FIT.1
SGP
SFP
The SFP contributions are small but non-negligible, especially for kaon.