Journal
PHYSICS LETTERS B
Volume 780, Issue -, Pages 340-345Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2018.03.026
Keywords
TDA; Exclusive single pion; Electroproduction; CLAS
Funding
- US Department of Energy
- National Science Foundation (NSF)
- Italian Istituto Nazionale di Fisica Nucleare (INFN)
- French Centre National de la Recherche Scientifique (CNRS)
- French Commissariat a l'Energie Atomique
- UK's Science and Technology Facilities Council
- National Research Foundation (NRF) of Korea
- US Department of Energy [DE-AC05-06OR23177]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1505615, 1506172] Funding Source: National Science Foundation
- STFC [ST/P004458/1, ST/L005719/1, ST/P004385/1, ST/J000175/1] Funding Source: UKRI
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We report on the first measurement of cross sections for exclusive deeply virtual pion electroproduction off the proton, ep -> e'n pi(+), above the resonance region at backward pion center-of-mass angles. The phi(pi)*-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. (C) 2018 The Authors. Published by Elsevier B.V.
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