Speaker
Description
We propose a novel observable $q_*$, sensitive to transverse momentum dependent distributions (TMDs) in the SIDIS process $e N \to e h X$, with $q_*/E_N$ defined purely by lab-frame angles. We prove factorization for $\mathrm{d} \sigma_h / \mathrm{d}q_*$ for $q_*\ll Q$ with standard TMD functions, enabling $q_*$ to substitute for the hadron transverse momentum $P_{hT}$. A double-angle reconstruction method is given which is exact to all orders in QCD for $q_*\ll Q$, allowing for angular reconstruction of $Q,x,y$. Resummation and convergence of perturbative QCD predictions for q* will also be discussed. By replacing measurements of $\mathrm{d}\sigma/\mathrm{d} P_{hT}\mathrm{d} \phi_h$ by $\mathrm{d}\sigma/\mathrm{d} q_*$, the prospects for precisely mapping the 3D structure of hadronization and confinement with TMDs are bright. We show that $q_{*}$ enables an order-of-magnitude improvement in the expected experimental resolution at the EIC.
