Electroproduction of Soft Pions at Large Momentum Transfers

TL;DR

This paper investigates pion electroproduction near threshold at high momentum transfers, calculating the S-wave multipoles using light-cone sum rules to understand the underlying Q^2 dependence.

Contribution

It introduces a calculation of the momentum transfer dependence of S-wave multipoles at threshold using light-cone sum rules, a novel approach in this context.

Findings

Calculated E_{0+} and L_{0+} multipoles as functions of Q^2.

Provided insights into the Q^2 dependence of pion electroproduction near threshold.

Enhanced understanding of the underlying QCD dynamics in pion production.

Abstract

We consider pion electroproduction on a proton target close to threshold for Q^2 in the region 1-10 GeV^2. The momentum transfer dependence of the S-wave multipoles at threshold, E_{0+} and L_{0+}, is calculated using light-cone sum rules.