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Title Tomography of pions and protons via transverse momentum dependent distributions
Authors Patrick Barry, Leonard Gamberg, Wolodymyr Melnitchouk, Eric Moffat, Daniel Pitonyak, Alexei Prokudin, Nobuo Sato
JLAB number JLAB-THY-23-3749
LANL number arXiv:2302.01192
Other number DOE/OR/23177-5706
Document Type(s) (Journal Article) 
Associated with EIC: No
Supported by Jefferson Lab LDRD Funding: No
Funding Source: Nuclear Physics (NP)
Other Funding:National Science Foundation

Compiled for Physical Review D
Volume 108
Page(s) L091504
Publication Abstract: 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 $5 \sigma$ smaller than that of the proton. Additionally, we find the transverse separation of the quark field decreases as the longitudinal momentum fraction decreases. In studying the nuclear modification of TMDs, we observe that it is similar to that found in collinear distributions. 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.
Experiment Numbers: other
Document: pdf
Accepted Manuscript: PhysRevD.108.L091504.pdf
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