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29 March 2024
 
  » arxiv » hep-ph/0408249

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Universality of soft and collinear factors in hard-scattering factorization
John C. Collins ; Andreas Metz ;
Date 23 Aug 2004
Journal Phys.Rev.Lett. 93 (2004) 252001
Subject hep-ph
AbstractUniversality in QCD factorization of parton densities, fragmentation functions, and soft factors is endangered by the process dependence of the directions of Wilson lines in their definitions. We find a choice of directions that is consistent with factorization and that gives universality between e^+e^- annihilation, semi-inclusive deep-inelastic scattering, and the Drell-Yan process. Universality is only modified by a time-reversal transformation of the soft function and parton densities between Drell-Yan and the other processes, whose only effect is the known reversal of sign for T-odd parton densities like the Sivers function. The modifications of the definitions needed to remove rapidity divergences with light-like Wilson lines do not affect the results.
Source arXiv, hep-ph/0408249
Other source [GID 1036075] pmid15697892
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