On the description of exclusive processes beyond the leading twist approximation

4 pages, 2 figuresInternational audienceWe describe hard exclusive processes beyond the leading twist approximation in a framework based on the Taylor expansion of the amplitude around the dominant light-cone directions. This naturally introduces an appropriate set of non-perturbative correlators whose number is minimalized after taking into account QCD equations of motion and the invariance under rotation on the light-cone. We show that the coordinate and momentum space descriptions are fully equivalent