Tomography of pions and protons via transverse momentum dependent distributions

被引：9

作者：

Barry, P. C. ^{[1
,2
]}

Gamberg, L. ^{[3
]}

Melnitchouk, W. ^{[1
,4
]}

Moffat, E. ^{[2
,3
]}

Pitonyak, D. ^{[5
]}

Prokudin, A. ^{[1
,3
]}

Sato, N. ^{[1
]}

机构：

[1] Jefferson lab, Newport News, VA 23606 USA

[2] Argonne Natl Lab, Phys Div, Lemont, IL 60439 USA

[3] Penn State Berks, Div Sci, Reading, PA 19610 USA

[4] Univ Adelaide, Dept Phys, CSSM & CDMPP, Adelaide 5000, Australia

[5] Lebanon Valley Coll, Dept Phys, Annville, PA 17003 USA

来源：

PHYSICAL REVIEW D | 2023年 / 108卷 / 09期

基金：

美国国家科学基金会; 澳大利亚研究理事会;

关键词：

LEADING NEUTRON-PRODUCTION; MASS MUON PAIRS; TO-BACK JETS; DRELL-YAN; PARTON DISTRIBUTIONS; CROSS-SECTIONS; DIMUON PRODUCTION; QCD; RENORMALIZATION; COLLISIONS;

D O I：

10.1103/PhysRevD.108.L091504

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 4u 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. 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.

引用

页数：7

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