Chiral-Odd Contribution to Single-Transverse Spin Asymmetry in Hadronic   Pion Production
  A formula for the single transverse spin asymmetry in the large-$p_T$ pion production in the nucleon-nucleon collision is derived. We focuss on the chiral-odd contribution where the transversity distribution and the chiral-odd spin-independent twist-3 distribution contributes. This contribution is expected to give rise to a large effect at $x_F\to -1$. 
Y. Kanazawa and Yuji Koike (Niigata Univ.)