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Apr 12 – 14, 2023
Minneapolis, Minnesota
US/Central timezone

Tomography of pions and protons via transverse momentum dependent distributions

Apr 13, 2023, 4:00 PM
20m
Orchestra B

Orchestra B

Speaker

Patrick Barry (Jefferson Lab)

Description

We perform the first simultaneous extraction of parton collinear and transverse degrees of freedom from low-energy fixed-target Drell-Yan data in order to compare the transverse momentum dependent (TMD) parton distribution functions (PDFs) of the pion and proton. We demonstrate that the transverse separation of the quark field encoded in TMDs of the pion is more than $\sim 5 \sigma$ smaller than that of the proton. Additionally, we find the transverse separation of the quark field decreases as its longitudinal momentum fraction decreases. In studying the nuclear modification of TMDs, we find clear evidence for a transverse EMC effect. In this talk, we discuss the methodology and various results, which call for a deeper examination of tomography in a variety of strongly interacting quark-gluon systems.

Primary authors

Alexei Prokudin (JLab) Daniel Pitonyak (Lebanon Valley College) Eric Moffat (Argonne National Lab) Leonard Gamberg (Penn State Berks) Nobuo Sato (Jefferson Lab) Patrick Barry (Jefferson Lab) Wally Melnitchouk (Jefferson Lab)

Presentation materials