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This article presents a summary of overlapping presentations by the author tothe QCD Evolution 2013 Workshop and to the Opportunities for Polarized Physicsat Fermilab Workshop. It contains an introduction to the concept ofKane-Pumplin-Repko (KPR) factorization and descibes how this concept can beused in the analysis of high-precision measurements of parity-conservingtransverse single-spin asymmetries. The discussion demonstrates that suchmeasurements can not only probe directly for specific mechanisms that enhanceour fundamental understanding of nonperturbative QCD but, because transversespin asymmetries are unambiguously perameterized by a spin-directed momentumshift, such measurements can also be used to calibrate other phenomenologicalapplications of transverse momentum dependent distributions (TMD's) and of TMDevolution. The calibration supplied by these measurements can thus enable theuse of TMD factorization for the exploration of a broad range of other aspectsof hadronic structure.

Kane-Pumplin-Repko Factorization: its application to precision measurements of transverse spin asymmetries and to the study of TMD evolution