Polarized hadron pair production from electron-positron annihilation

Understand

We study the production of two almost back-to-back hadrons from the annihilation of an electron and a positron, allowing for the polarization of all particles involved.

• In particular, we conduct a general (model-independent) structure function decomposition of the cross section for the case $e^+e^- \to \gamma^* \to h_ah_bX$.
• Moreover, using the parton model we calculate the relevant structure functions in terms of twist-2 transverse momentum dependent (TMD) fragmentation functions (FFs).
• We also give results for the situation $e^+e^- \to Z^* \to h_ah_bX$ (including $\gamma$-$Z$ interference) within this model.