The Proton Spin, Semi-Inclusive processes, and a future Electron Ion Collider.
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.
Publisher URL: http://arxiv.org/abs/1801.04842
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