  We present the first extraction of the transversity distribution in the
framework of collinear factorization based on the global analysis of pion-pair
production in deep-inelastic scattering off transversely polarized targets and
in proton-proton collisions with one transversely polarized proton. The
extraction relies on the knowledge of di-hadron fragmentation functions, which
are taken from the analysis of electron-positron annihilation data. For the
first time, the chiral-odd transversity is extracted from a global analysis
similar to what is usually done for the chiral-even spin-averaged and helicity
distributions. The knowledge of transversity is important for, among other
things, detecting possible signals of new physics in high-precision low-energy
experiments.
