The ~ d d → αX reaction at beam energies close to the η threshold shows very strong structure in the missing mass corresponding to the ABC enhancement. The deuteron tensor analysing power Ayy, and the slope of the vector analysing power Ay with respect to angle, have been measured for this reaction around the forward direction. Both signals are small, and their variations with the α-particle mo...

We analyze single transverse-spin asymmetries for hadronic pion production at large transverse momenta using QCD factorization. In the large xF region, leading contributions to the asymmetries are naturally produced by twist-3 parton correlation functions that couple quark fields and gluon field strengths. With a simple model for these matrix elements, leading-order asymmetries calculated from ...