Boglione MDotson AGamberg LGordon SGonzalez-Hernandez J.OProkudin ARogers T.CNOBUO SATO2021-07-212021-07-21201911266708https://www.scopus.com/inward/record.uri?eid=2-s2.0-85073685962&doi=10.1007%2fJHEP10%282019%29122&partnerID=40&md5=857a564a429a638203caa524baa4790dhttps://scholars.lib.ntu.edu.tw/handle/123456789/572124We construct a language for identifying kinematical regions of transversely differential semi-inclusive deep inelastic scattering (SIDIS) cross sections with particular underlying partonic pictures, especially in the regions of moderate to low Q where sensitiv- ity to kinematical effects becomes non-trivial. These partonic pictures map to power law expansions whose leading contributions ultimately lead to well-known QCD factorization theorems. In order to establish the consistency of a particular observable in SIDIS process with an estimate of the appropriate underlying partonic picture, we introduce new quan- titative criteria expressed in terms of various ratios of partonic and hadronic momentum degrees of freedom. We propose how to use these criteria in phenomenology and provide a web tool which allows visualization of these ratios for any chosen kinematic configuration. ? 2019, The Author(s).journal article10.1007/JHEP10(2019)1222-s2.0-85073685962