Speaker
Description
This presentation has two parts. We first discuss a new definition of di-hadron fragmentation functions which have an interpretation as number densities. We then present the results of our extraction of the di-hadron fragmentation functions and the transversity distributions of the nucleon, based on data for electron-positron annihilation, semi-inclusive DIS and proton-proton collisions. We compare our results to a previous analysis of the di-hadron channel and to extractions of the transversity from single-hadron production. Furthermore, we compute the tensor charge which we compare with, in particular, calculations from lattice QCD. Overall, we find that all currently available information on the transversity and the tensor charge is in agreement within errors, leading to a universal picture of these quantities.
