Theoretical aspects of spin physics

Details Theoretical aspects of spin physics Theoretical aspects of spin physics

2003-12-11

arxiv.org/abs/hep-ph/0312149v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 11 eps figures; Talk presented at the Ringberg Workshop `New Trends in HERA Physics 2003', Ringberg Castle, Tegernse

Scientific paper

A summary is given of how spin enters in collinearly factorizing processes. Next, theoretical aspects of polarization in processes beyond collinear factorization are discussed in more detail, with special focus on recent developments concerning the color gauge invariant definitions of transverse momentum dependent distribution and fragmentation functions, such as the Sivers and Collins effect functions. This has particular relevance for azimuthal single spin asymmetries, which currently receive much theoretical and experimental attention.

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