Abstract
We consider the cross section of the deep inelastic pion electroproduction on a proton target at threshold for in the region . The corresponding amplitudes are described in terms of two form factors which we calculate using light-cone sum rules to leading order in QCD and including higher twist corrections. Our results suggest a considerable change from a small region that can be treated in the soft-pion limit using current algebra. In particular, we obtain a to production ratio of order and significant nucleon helicity-flip contributions.
- Received 5 December 2006
DOI:https://doi.org/10.1103/PhysRevD.75.014021
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