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Recent progress in the understanding of single spin asymmetries
Author(s) -
Metz A.,
Schlegel M.
Publication year - 2004
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.200410112
Subject(s) - parton , universality (dynamical systems) , physics , twist , fragmentation (computing) , particle physics , scattering , spin (aerodynamics) , statistical physics , theoretical physics , quantum mechanics , quantum chromodynamics , mathematics , computer science , operating system , geometry , thermodynamics
Over the past years a lot of progress has been made in the understanding of single spin asymmetries in hard scattering processes. We briefly review this subject, covering the non‐vanishing of time‐reversal odd parton distributions, universality of fragmentation functions, and the discovery of previously unknown time‐reversal odd parton distributions at subleading twist. Interestingly enough, all these developments were initiated by simple model calculations.