Leipzig 2002 – scientific programme

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T: Teilchenphysik

T 503: Diffraktion

T 503.7: Talk

Thursday, March 21, 2002, 17:45–18:00, HS 10

On the structure of the virtual Compton amplitudewith additional final-state meson in the extended Bjorken region — •Joerg Eilers — Wigandstrasse 13 04229 Leipzig

Using the framework of the non-local light-cone expansion a systematic study is performed for the structure of the twist-2 contributions to the virtual Compton amplitude in polarized deep-inelastic non-forward scattering for general nucleon spin with an additional scalar meson in the final state. A useful kinematic parameterization allowing for appropriate triple-valued off-forward parton distribution amplitudes is given. One-variable amplitudes being adapted to the fixed parameters of the extended Bjorken region are introduced by decomposing the Compton amplitude into collinear and non-collinear components. These amplitudes obey Wandzura-Wilczek and Callan-Gross like relations. The evolution equations for all the distribution amplitudes are determined showing that the additional meson momentum does not appear in the evolution kernels. The generalization to n outgoing mesons is given.