2015
DOI: 10.1007/jhep08(2015)053
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Operator analysis of pT -widths of TMDs

Abstract: Transverse momentum dependent (TMD) parton distribution functions (PDFs), TMDs for short, are defined as the Fourier transform of matrix elements of nonlocal combinations of quark and gluon fields. The nonlocality is bridged by gauge links, which for TMDs have characteristic paths (future or past pointing), giving rise to a process dependence that breaks universality. It is possible, however, to construct sets of universal TMDs of which in a given process particular combinations are needed with calculable, pro… Show more

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Cited by 15 publications
(15 citation statements)
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References 68 publications
(116 reference statements)
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“…Furthermore, since we look at TMDs, one must worry about the process dependence coming from the fact that functions with different types of gauge links may be needed to describe a process at measured transverse momenta [36]. Another complication is that the dependence of the distributions on k 2 T may require additional functions involving gluonic poles [37]. Assumptions on some of the TMDs and using approximations such as taking the large-N c limit, may thus be necessary.…”
Section: Discussionmentioning
confidence: 99%
“…Furthermore, since we look at TMDs, one must worry about the process dependence coming from the fact that functions with different types of gauge links may be needed to describe a process at measured transverse momenta [36]. Another complication is that the dependence of the distributions on k 2 T may require additional functions involving gluonic poles [37]. Assumptions on some of the TMDs and using approximations such as taking the large-N c limit, may thus be necessary.…”
Section: Discussionmentioning
confidence: 99%
“…Depending on the rank of the functions, more gluonic pole operators may enter [20]. For two gluonic poles this lead to an interesting link between the Wilson loop correlator and the gluon correlator at x = 0.…”
Section: Pos(dis2016)207mentioning
confidence: 99%
“…To follow up on the understanding of the Sivers effect origin, numerous launched studies have theoretically been achieved in different key processes in the vein of ep ↑ collision, the heavy quark pair and dijet production [33], the inelastic J/ψ photoproduction [47], e + p ↑ → e + J/ψ + X [30,48,49], and also in pp ↑ scattering for instance pp ↑ → h + X [50], D-meson production [34,51] and back to back jet correlations [52], etc. Even so, a great deal of insufficiencies have been pointed out that certain interactions are in failure in quantifying gluon Sivers function attributable to the problem of TMD factorization breaking contributions [53], some features have been somewhat probed.…”
Section: Introductionmentioning
confidence: 99%