18-22 October 2021
Matsue, Shimane Prefecture, Japan
Asia/Tokyo timezone

First Extraction of Polarized Sea Asymmetry from Weak Boson Production in Proton-Proton Collisions

22 Oct 2021, 07:30
Room 501 (Kunibiki Messe)

Room 501

Kunibiki Messe

Parallel Session Presentation Nucleon Helicity Structure Nucleon Helicity Structure


Christopher Cocuzza (Temple University)


We present the first global QCD analysis of helicity parton distribution functions (PDFs) to include the latest polarized $W$-lepton production data from the STAR collaboration at the Relativistic Heavy-Ion Collider. This data allows the first extraction of a nonzero helicity light quark sea asymmetry within a global QCD analysis. By performing a simultaneous extraction of the unpolarized and helicity PDFs, we are also able to extract for the first time in a self-consistent manner the polarizations of the light sea quarks $\Delta \bar{u}/\bar{u}$ and $\Delta \bar{d}/\bar{d}$.

Primary authors

Christopher Cocuzza (Temple University) Dr Jake Ethier (Nikhef) W. Melnitchouk (Jefferson Lab) Dr Andreas Metz (Temple University) N. Sato (Jefferson Lab)

Presentation Materials