We report on the first measurement of cross sections for exclusive deeply virtual pion electroproduction off the proton, ep→e′nπ+, above the resonance region at backward pion center-of-mass angles. The φπ∗-dependent cross sections were measured, from which we extracted three combinations of structure functions of the proton. Our results are compatible with calculations based on nucleon-to-pion transition distribution amplitudes (TDAs) and shed new light on nucleon structure.
@article{arxiv.1711.08486,
title = {Hard exclusive pion electroproduction at backward angles with CLAS},
author = {K. Park and M. Guidal and R. W. Gothe and B. Pire and K. Semenov-Tian-Shansky and J. -M. Laget},
journal= {arXiv preprint arXiv:1711.08486},
year = {2018}
}