Speaker
Description
Understanding the strong interaction dynamics that underlie the emergence of hadron mass (EHM) represents one of the most challenging open problems in hadronic physics. The new opportunities for gaining insight into EHM from the experimental results on the evolution of the N->N electroexcitation amplitudes (the so-called gvpN electrocouplings) with photon virtuality Q^2 will be presented. The CLAS results on the electrocouplings of the Delta(1232)3/2+ and N(1440)1/2+ were successfully reproduced within the continuum Schwinger method (CSM) for Q2 from 1-5 GeV^2 by employing the same momentum dependence of the dressed quark mass inferred from the QCD Lagrangian that was used in the successful description of the pion and nucleon elastic electromagnetic form factors and supported in independent LQCD evaluations. The CSM predictions for the Delta(1600)3/2+ electrocouplings made in 2019 have been confirmed in analysis of the CLAS pi+pi-p electroproduction data published in 2023. This successful description of a broad array of observables within the CSM-framework offers sound evidence for insight into EHM from studies of the N electroexcitation amplitudes. New results on electrocouplings of Ns in the third resonance region will be available soon from analysis of pi+pi-p electroproduction data that will shed light on the connection between dynamical chiral symmetry breaking and EHM. Experiments of the 6-GeV era with CLAS allow us to explore the range of distances where <30% of hadron mass is expected to be generated while data from CLAS12 for Q^2 <10 GeV^2 will significantly extend this range. A further increase of the CEBAF energy to 22 GeV and pushing the capabilities of CLAS12 to measure exclusive meson electroproduction at luminosities up to 5-10^35 cm^-2s^-1 will offer the only foreseen opportunity to explore the full range of distances where the dominant part of hadron mass and N structure emerge from QCD
