On timelike and spacelike hard exclusive reactions - Archive ouverte HAL
Pré-Publication, Document De Travail Année : 2012

On timelike and spacelike hard exclusive reactions

Résumé

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.

Dates et versions

hal-00681298 , version 1 (21-03-2012)

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D. Mueller, B. Pire, L. Szymanowski, J. Wagner. On timelike and spacelike hard exclusive reactions. 2012. ⟨hal-00681298⟩
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