Abstract
Transverse momentum dependent (TMD) observables in high-energy particle collisions allow one to study the motion of hadron constituents (partons) in three dimensions. The intense theoretical, phenomenological, and experimental work over the last several decades has seen great progress in modeling and extracting TMD parton distribution functions (PDFs) and fragmentation functions (FFs) [1, 2]. The wealth of experimental data, both current and future [3–6], across various reactions and energy ranges, along with substantial progress in other approaches, such as Lattice QCD [7], has increased the demand to rigorously study the intrinsic transverse motion of hadrons. Such issues currently being addressed include factorization, evolution, and operator definitions of TMD distributions, as well as how they influence phenomenological and Lattice QCD studies. Therefore, in this special issue we attempt to further the effort of understanding TMD structure through a series of review articles that address some of the significant areas of ongoing research.
Highlights
In this special issue we attempt to further the effort of understanding Transverse momentum dependent (TMD) structure through a series of review articles that address some of the significant areas of ongoing research
Large Hadron Collider and showed that flavor-dependent TMD effects are comparable in size to other nonperturbative effects
Lu presented the current understanding of the pion-nucleon Drell-Yan process from the point of view of TMD factorization
Summary
In this special issue we attempt to further the effort of understanding TMD structure through a series of review articles that address some of the significant areas of ongoing research. I. Scimemi provided an overview of the tools and concepts which are behind TMD factorization and evolution. He considered both theoretical and phenomenological aspects and the importance of future collider data on further developments. Signori focused on the possible flavor dependence of quark intrinsic transverse momentum.
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