Please visit Jefferson Lab Event Policies and Guidance before planning your next event: https://www.jlab.org/conference_planning.

Sep 24 – 29, 2023
US/Eastern timezone

Tomography of pions and protons from transverse momentum dependent distributions

Sep 26, 2023, 11:25 AM
25m
Meeting Room 1-2 (Durham Convention Center)

Meeting Room 1-2

Durham Convention Center

Talk 3D Structure of the Nucleon: TMDs 3D Structure of the Nucleon: TMDs

Speaker

Patrick Barry (Jefferson Lab)

Description

We perform the first simultaneous extraction of parton collinear and transverse degrees of freedom from low-energy $pA$ and $\pi A$ fixed-target Drell-Yan data in order to compare the transverse momentum dependent (TMD) parton distribution functions (PDFs) of the pion and proton. Specifically, we extract both pion PDFs and TMD PDFs simultaneously, and at the same time, we extract proton TMD PDFs in this analysis. We demonstrate that the average transverse separation of the quark field encoded in TMDs of the pion is less than that in the proton by more than $5 \sigma$. The behavior of this average transverse separation of the quark field is that it decreases as its longitudinal momentum fraction, $x$ decreases. In studying the nuclear modification of TMDs, we find clear evidence for a transverse EMC effect. We comment on possible explanations for these intriguing behaviors, 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