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HK: Physik der Hadronen und Kerne

HK 50: Plenary Session

HK 50.1: Plenarvortrag

Freitag, 15. März 2002, 11:00–11:30, Plenarsaal

The Advantage of Exclusiveness — •Rainer Jakob — BUGH Wuppertal, Theoretische Physik, Gauss-Str.20, 42097 Wuppertal

Exclusive hard processes provide a distinguished view on the quark and gluon substructure of hadrons. The additional constraint on the final state in exclusicve processes enforces strict requirements on possible reaction mechanisms operative at non-asymptotic momentum transfers.

The event of generalized parton distribution not only has emphasized the close relationship between perturbative QCD descriptions of inclusive and exclusive processes, but has greatly contributed in putting the formalism of exclusive reactions on a sound basis in the context of Quantum Field Theory. In generalizing the well-known and well-trusted concepts of forward parton distribution to the non-forward cases it became evident that only exclusive measurements can shed light on the question about the spatial location of partons inside hadrons, and related items like the orbital angular momentum of partons.

On overview about the present status in the description of hard exclusive reactions will be attempted. Where are we now, and where are we heading for ?