Partonic Orbital Angular Momentum

Aula Leale (Laboratori Nazionali di Frascai)

Aula Leale

Laboratori Nazionali di Frascai

With the EMC experiment in the late 1980s which showed the quark spin to have a very small contribution to the proton spin, the hunt has been on for other sources. I focus on the angular momentum contribution generated by the motion of quarks and gluons inside the proton. The Generalised Parton Distributions play a key role in our understanding of this study. By making a connection to helicity amplitudes we can have a physical motivation for the OAM picture described by the GPDs. Most importantly, it helps us understand how we can connect orbital angular momentum to an observable that can be measured experimentally.
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