Speaker
Description
In this work, we present updates of the progress towards the first simultaneous extraction of unpolarized collinear and transverse momentum dependent (TMD) parton distribution functions (PDFs) in the proton. The TMD factorization is conveniently formulated in $b_T$-space, which is the Fourier conjugate to the intrinsic transverse momentum of quarks within the proton, $k_T$. In the small-$b_T$ region, the TMD is dominated by perturbative contributions, which are described by the operator product expansion (OPE) through collinear PDFs and evolution, while the large-$b_T$ region is dominated by intrinsic nonperturbative transverse motion. Because of the explicit dependence of the PDF in the TMD, we perform a simultaneous extraction of collinear PDFs and nonperturbative TMD structures using the small-$q_T$ Drell-Yan (DY) and $Z$-boson production data as well as the collinear datasets such as those from recent JAM extractions. We analyze the impacts of the PDFs from the inclusion of the small-$q_T$ data.
