Observables for quark and gluon transverse orbital angular momentum

I will present twist-three observables from deeply virtual exclusive scattering experiments constraining both the quark and gluon transverse orbital angular momentum. The latter will be confronted with a calculation of the generalized transverse momentum distribution k_T² moment using a diquark model. The calculation includes the evaluation of the quark-gluon-quark term giving rise to gluonic pole contributions in both single spin asymmetry (SSA) and double spin asymmetry (DSA) measurements. Similarities with the occurrence of gluonic poles in the Sivers function will be discussed.