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arXiv · 1304.0944

Universality of TMD distribution functions of definite rank

P. J. Mulders·M. G. A. Buffing·A. Mukherjee
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Abstract

Transverse momentum dependent (TMD) distribution and fragmentation functions are described as Fourier transforms of matrix elementscontaining nonlocal combinations of quark and gluon fields. These matrix elements also contain a gauge link operator with a process dependent path, of which the process dependence that can be traced back to the color flow in the process. Expanding into irreducible tensors built from the transverse momenta $p_\st$, we can define a universal set of TMD correlators of definite rank with a well-defined operator structure.

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P. J. Mulders, M. G. A. Buffing, A. Mukherjee. 2013-04-03. Universality of TMD distribution functions of definite rank. https://doi.org/10.1393/ncc%2Fi2013-11590-6

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