Speaker
Ralf Gothe
(University of South Carolina)
Description
Why nucleon resonance excitations at and beyond the photopoint play a unique and complementary role in leading the path forward to a strong QCD-based theory will be laid out and illustrated based on recent exclusive meson electroproduction cross sections off free and bound nucleons from CLAS, first new and other still anticipated cross sections at higher photon virtualites from CLAS12, as well as potentially upcoming opportunities with CLAS22. Examples for the extraction of consistent N$\,\rightarrow\,$N* transition form factors form these cross sections will be presented, which are a crucial link to demonstrate the importance of these helicity-dependent electroexcitation couplings towards establishing a comprehensive QCD theory.
Author
Ralf Gothe
(University of South Carolina)