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). These non-perturbative objects are defined as matrix elements of three-quark-light-cone-operators and characterize partonic correlations with a particular emphasis on baryon charge distribution inside a nucleon. Keywords: TDA, Exclusive single pion, Eletroproduction, CLAS
Copyright © 2018 Elsevier B.V. This article first appeared in Physics Letters B 780, (May 10,2018): 340-245. doi:10.1016/j.physletb.2018.03.026.
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Park, K., M. Guidal, R. W. Gothe, B. Pire, K. Semenov-Tian-Shansky, J.-M. Laget, K. P. Adhikari, G. Gilfoyle, et al. “Hard Exclusive Pion Electroproduction at Backward Angles with CLAS.” Physics Letters B 780 (May 10, 2018): 340–45. https://doi.org/10.1016/j.physletb.2018.03.026.