Authors Referees APS Members |
January 2008, to be published in Physical Review D1
Threshold pion electroproduction at large momentum transfers
We consider pion electroproduction close to threshold for $Q^2$ in the region $1-10$~GeV$^2$ on a nucleon target. The momentum transfer dependence of the S-wave multipoles at threshold, $E_{0+}$ and $L_{0+}$, 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 $F_2(W,Q^2)$ in the threshold region. © 2008 The American Physical Society.
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