Title: Left-right bias in high energy polarized e+n, p+p and p+A collisions
Speaker:Xiaodong Jiang (LANL)

Abstract: Over the last three decades, large single-spin asymmetries have been observed in high energy polarized p?+p?hadron+X reactions on transversely polarized protons. According to perturbative QCD, this type of parity-conserving left-right asymmetry should be very small if produced from collinear quarks. However, when transverse momentum is considered, single-spin asymmetries can be generated either through quarks` angular motion or through transverely polarized quarks’ fragmentation processes. In the last decade, similar single-spin asymmetry phenomena have also been observed in semi-inclusive deep-inelastic scattering (e+N??e’+h+X), and very recently in inclusive hadron productions (e+N??h+X), on transversely polarized targets.I will describe recent experimental results and introduce upcoming transverse single-spin asymmetry measurements for polarized target Drell-Yan production at Fermilab (E1039, p+p? ?mu+mu- X), and for prompt photon and neutral pion productions in p?+p and p?+A collisions with the PHENIX experiment at RHIC