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We discuss the production of polarized hadrons in polarized lepton nucleon interactions and show that the helicity density matrix of the hadron, when measurable, can give information on the spin structure of the nucleon and the spin dependence of the quark fragmentation process. Single spin asymmetries in the $ell N^uparrow to hX$ process are also briefly discussed.
We present a study of transverse single-spin asymmetries (SSAs) in $p^uparrow pto J/psi,X$ and $p^uparrow pto D X$ within the framework of the generalized parton model (GPM), which includes both spin and transverse momentum effects, and show how they
We report on a recent investigation of the single spin asymmetry (SSA) in low virtuality electroproduction of $J/psi$ in color evaporation model. We show that this can be used as a probe for the still unknown gluon Sivers function.
Within a TMD approach we discuss the impact of quasi-real (Weizsacker-Williams) photon contribution to the transverse single-spin asymmetry, $A_N$, for the inclusive process $ell p^uparrow to pi, X$. This study extends a previous one where only the l
We suggest inclusive hadron production in ultra-peripheral proton-nucleus collisions (UPCs) $p^uparrow A to h AX$ as a new channel to investigate single spin asymmetries (SSAs), in particular, to test the assumed dominance of the contribution from tw
We present estimates of transverse single-spin asymmetry in prompt photon production in the scattering of low virtuality photons off a polarized proton target and discuss the possibility of using this as a probe to get information about the gluon Siv