Spectral analysis of gluonic pole matrix elements for fragmentation

Details Spectral analysis of gluonic pole matrix elements for fragmentation Spectral analysis of gluonic pole matrix elements for fragmentation

2008-03-18

arxiv.org/abs/0803.2632v2

Phys.Rev.D77:114026,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 4 figures, added references

Scientific paper

10.1103/PhysRevD.77.114026

The non-vanishing of gluonic pole matrix elements can explain the appearance of single spin asymmetries in high-energy scattering processes. We use a spectator framework approach to investigate the spectral properties of quark-quark-gluon correlators and use this to study gluonic pole matrix elements. Such matrix elements appear in principle both for distribution functions such as the Sivers function and fragmentation functions such as the Collins function. We find that for a large class of spectator models, the contribution of the gluonic pole matrix element in fragmentation functions vanishes. This outcome is important in the study of universality for fragmentation functions and confirms findings using a different approach.

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