Nucleon Tomography with 0-jettiness

Abstract

We propose a novel strategy to systematically isolate the nucleon's intrinsic non-perturbative three-dimensional structure by employing 0-jettiness to suppress initial-state radiation in transverse-momentum-dependent observables. Applying this method to transverse single spin asymmetries (SSAs) in $W^{\pm }$ and $Z^0$ boson production at RHIC, we demonstrate a substantial enhancement of the asymmetry signal (e.g., by $115\%$ for $W^{-}$ SSA at $q_{\perp }=5$ GeV). We show that this enhancement yields a substantial net gain in experimental sensitivity -- even after accounting for the statistical cost of the veto -- facilitating a more definitive test of the predicted Sivers function sign change. We further explore its applicability to spin-dependent measurements at the Electron-Ion Collider. Our analysis is formulated within a joint resummation framework that systematically resums large logarithms associated with both the veto scale and the gauge boson's transverse momentum.

Comments: 14 pages, 7 figures. v2: updated to the published version with additional typographical corrections