Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2012-03-20
Physics
High Energy Physics
High Energy Physics - Phenomenology
major text revision; results, references, and author added
Scientific paper
We show that the colinear factorization properties of QCD amplitudes in the generalized Bjorken regime allow to relate in a simple way the amplitudes of exclusive reactions for spacelike and for timelike processes, at next to leading order in the strong coupling $\alpha_s$. This leads, in particular, to simple formulae relating on the one hand the amplitudes for electroproduction of a photon or meson to the ones for photo- or meso-production of a lepton pair on the other hand. These relations will be useful in testing the relevance of the leading twist analysis of experimental data in terms of generalized parton distributions.
Mueller Doreen
Pire Bernard
Szymanowski Lech
Wagner Jakub
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