Speaker
Description
We first present a new quantum field-theoretic definition of dihadron fragmentation functions (DiFFs) that have a number density interpretation. We then discuss the first global QCD analysis of dihadron production for a comprehensive set of data in electron-positron annihilation, semi-inclusive deep-inelastic scattering, and proton-proton collisions, from which we extract simultaneously the transversity distributions of the nucleon and pi+pi- DiFFs. In our fits, we incorporate known theoretical constraints on transversity. We show that lattice-QCD results for the tensor charges can be successfully included in the analysis. We also find agreement with results for the transversity and tensor charges obtained from measurements on single-hadron production, demonstrating for the first time the universal nature of all available information for the transversity distributions and the tensor charges of the nucleon.
