Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-01-20
Eur.Phys.J.C47:147-162,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
Scientific paper
10.1140/epjc/s2006-02554-2
Transverse momentum dependent parton distribution and fragmentation functions are described by hadronic matrix elements of bilocal products of field operators off the light-cone. These bilocal products contain gauge-links, as required by gauge-invariance. The gauge-links are path-ordered exponentials connecting the field operators along a certain integration path. This integration path is process-dependent, depending specifically on the short-distance partonic subprocess. In this paper we present the technical details needed in the calculation of the gauge-links and a calculational scheme is provided to obtain the gauge-invariant distribution and fragmentation correlators corresponding to a given partonic subprocess.
Bomhof C. J.
Mulders Piet J.
Pijlman Fetze
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