Transverse Single-Spin Asymmetries in Inclusive DIS and SIDIS Production of Photons: Numerical Predictions using Models for Multi-Parton Correlators

High energy electrons can probe the inner structure of hadrons through collisions that produce many particles. If the target nucleon (proton or neutron) is transversely polarized, the final-state particles are produced in different directions asymmetrically, and it is this asymmetry we are interested in. In particular, our research focuses on AUT, the asymmetry produced by an unpolarized electron that undergoes deep-inelastic scattering (DIS) on a transversely polarized target of either a proton or a neutron. We consider the case where only the electron is detected in the final state (inclusive DIS) as well as when both the electron and a photon are measured (semi-inclusive DIS). In both processes, one is sensitive to quark-gluon-quark (qgq) correlators in the nucleon where the two quarks carry different momentum fractions, a region where very little is known about these objects. We compare experimental data gathered at JLab and HERMES to theoretical calculations using models for these qgq parton distribution functions (PDFs) as well as produce predictions for the upcoming Electron-Ion Collider.