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paper

Positivity bounds for Sivers functions

arXiv:1003.4913 · doi:10.1016/j.physletb.2010.11.045

Abstract

We generalize a positivity constraint derived initially for parity-conserving processes to the parity-violating ones, and use it to derive non-trivial bounds on several Sivers functions, entering in the theoretical description of single spin asymmetry for various processes.

6 pages, version to appear in PLB