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Generalized universality of definite rank gluon transverse momentum dependent correlators

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Title Generalized universality of definite rank gluon transverse momentum dependent correlators
 
Creator BUFFING, MGA
MUKHERJEE, A
MULDERS, PJ
 
Subject DEEP-INELASTIC SCATTERING
FINAL-STATE INTERACTIONS
SINGLE-SPIN ASYMMETRIES
HARD PROCESSES
DRELL-YAN
 
Description Transverse momentum dependent (TMD) parton correlators describing the partonic structure of hadrons contain gauge links, required by color gauge invariance. The required gauge links enter in the matrix elements that contain the parton fields and depend on the color flow in the hard process. The correlators are expanded in terms of transverse momentum dependent parton distribution functions, referred to as TMD PDFs, or in short TMDs. In this paper, we introduce gluon TMDs of definite rank, by making an expansion of the TMD gluon correlator with the help of irreducible tensors built from the transverse momenta. The process dependence is isolated in gauge-link-dependent gluonic pole factors multiplying the TMDs. It is important to account for the different possibilities in the color structure within the matrix elements, leading to multiple TMDs at a given rank. In this way we are able to write the leading tree-level result for a hard process in terms of process-dependent gluon correlators which are expressed in a finite set of universal TMDs. We tabulate the gluonic pole factors for various gauge links, among them those that are relevant for 2 -> 2 processes.
 
Publisher AMER PHYSICAL SOC
 
Date 2014-10-17T04:23:55Z
2014-10-17T04:23:55Z
2013
 
Type Article
 
Identifier PHYSICAL REVIEW D, 88(5)
http://dx.doi.org/10.1103/PhysRevD.88.054027
http://dspace.library.iitb.ac.in/jspui/handle/100/15940
 
Language en