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Sep 24 – 29, 2023
US/Eastern timezone

Recent Updates from the JAM Collaboration on Helicity PDFs

Sep 26, 2023, 2:00 PM
30m
Junior Ballroom D1-D2 (Durham Convention Center)

Junior Ballroom D1-D2

Durham Convention Center

Talk Nucleon helicity structure Nucleon Helicity Structure

Speaker

Christopher Cocuzza (Temple University)

Description

We present the latest global QCD analysis results from the Jefferson Lab Angular Momentum (JAM) collaboration on helicity PDFs. We focus on the light quark sea asymmetry, including in the analysis the latest $W$-lepton production data from the STAR collaboration at RHIC, as well as the sign of the gluon's helicity, including the latest jet production data from RHIC. We find a nonzero sea asymmetry and that current experimental data is not able to determine the sign of the gluon's helicity without constraints from theory.

Primary authors

Andreas Metz (Physics Department, Temple University, Philadelphia) Christopher Cocuzza (Temple University) Nobuo Sato (Jefferson Lab) Wally Melnitchouk (Jefferson Lab) Yiyu Zhou

Presentation materials