We discuss spin physics, Guido Altarelli's contribution to it, and what we still have to learn. We set out in particular a programme for incorporating constraints from semi-inclusive data into global fits of polarized PDFs, and discuss the need for the EIC to increase the precision and kinematic coverage of current measurements.
|Title of host publication||From My Vast Repertoire ... Guido Altarelli's Legacy|
|Publication status||Published - 15 Jan 2018|
|Name||Memorial volume for Guido Altarelli|