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We consider pion electroproduction close to threshold for Q² in the region 1--10 GeV² on a nucleon target. The momentum transfer dependence of the S-wave multipoles at threshold, E₀₊ and L₀₊, is calculated in the chiral limit using light-cone sum rules. Predictions for the cross sections in the threshold region are given taking into account P-wave contributions that, as we argue, are model independent to a large extent. The results are compared with the SLAC E136 data on the structure function F₂(W,Q²) in the threshold region.
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Braun et al. (2008) studied this question.
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