Hard exclusive pion electroproduction at backward angles with CLAS.
We report on the first measurement of cross sections for exclusive deeply virtual pion electroproduction off the proton, , above the resonance region at backward pion center-of-mass angles. The ⁎-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.
Physics Letters B
Park, K.; Guidal, M.; Gothe, R. W.; Pire, B.; Semenov-Tian-Shansky, K.; Laget, J-M.; Adhikari, K. P.; Biselli, Angela; and CLAS Collaboration, "Hard exclusive pion electroproduction at backward angles with CLAS." (2018). Physics Faculty Publications. 147.
Park, K., M. Guidal, R. W. Gothe, B. Pire, K. Semenov-Tian-Shansky, J-M. Laget, K. P. Adhikari, Biselli A. et al [CLAS Collaboration]. "Hard exclusive pion electroproduction at backward angles with CLAS." Physics Letters B 780 (2018): 340-345. https://doi.org/10.1016/j.physletb.2018.03.026