Paper
Single spin asymmetry for $p^{\uparrow}p \to πX$ in perturbative QCD
Authors
M. Anselmino, M. Boglione, F. Murgia
Abstract
Within the QCD-improved parton model and assuming the factorization theorem to hold in the helicity basis and for higher twist contributions, we show how non zero single spin asymmetries in hadron-hadron high energy and moderately large inclusive processes can be obtained, even in massless perturbative QCD, provided the quark intrinsic motion is taken into account. A simple model is constructed which reproduces the main features of the data on the single spin asymmetry observed in inclusive pion production in collisions.