Extraction of unpolarized TMD widths using collinearity criteria with HERMES multiplicities in semi-inclusive deep-inelastic scattering

Using a Gaussian ansatz for the transverse momentum dependence of unpolarized transverse momentum dependent (TMD) functions, we analyze HERMES multiplicities in semi-inclusive deep-inelastic scattering (SIDIS). We discuss the importance of data selection in conducting the fit, where, in particular, we implement for the first time new collinearity criteria that allow us to better separate the current and target fragmentation regions. We compare our parameters to previous extractions in order to better interpret our results. We also give an outlook on what impact this criterion can have on on-going and future experiments.