Partonic Pole Matrix Elements for Fragmentation
S. Meissner, A. Metz
TL;DR
This paper demonstrates that partonic pole matrix elements for fragmentation vanish, providing new insights into transverse single spin asymmetries and supporting the universality of transverse-momentum-dependent fragmentation functions.
Contribution
It offers a model-independent analysis showing the vanishing of partonic pole matrix elements, clarifying their role in spin asymmetries and fragmentation function universality.
Findings
Partonic pole matrix elements for fragmentation vanish.
Supports the universality of transverse-momentum-dependent fragmentation functions.
Provides new understanding of transverse single spin asymmetries.
Abstract
A model-independent analysis of collinear three-parton correlation functions for fragmentation is performed. By investigating their support properties it is shown, in particular, that the so-called partonic pole matrix elements vanish. This sheds new light on the understanding of transverse single spin asymmetries in various hard semi-inclusive reactions. Moreover, it gives additional strong evidence for the universality of transverse-momentum-dependent fragmentation functions.
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