N$^3$LO extraction of the Sivers function from SIDIS, Drell-Yan, and $W^\pm/Z$ data

Understand

We perform the global analysis of polarized Semi-Inclusive Deep Inelastic Scattering (SIDIS), pion-induced polarized Drell-Yan (DY), and $W^\pm/Z$ boson production data and extract the Sivers function for $u$, $d$, $s$ and for sea-quarks.

• We use the framework of transverse momentum dependent factorization at N$^3$LO accuracy.
• The Qiu-Sterman function is determined in a model-independent way from the extracted Sivers function.
• We also evaluate the significance of the predicted sign change of Sivers function in DY with respect to SIDIS.