Speaker
Description
The emergence of hadron mass (EHM) represents one of the most challenging and still open problem in the Standard Model. New opportunities to shed light on EHM from the studies of the nucleon resonance electroexcitation amplitudes (or $g_vpN^*$ electrocouplings) in the range of photon virtualities $Q^2<35$ GeV$^2$ from the measurements of exclusive meson electroproduction with a detector capable of collecting data at luminosities > $10^36$ cm$^{-2}$sec$^{-1}$ of a near 4pi acceptance and with a continuous electron beam of 24 GeV energy will be presented in this talk. Analyses of the $Q^2$-evolution of the $g_vpN^*$ electrocouplings from the measurements with the CLAS detector within the continuum Schwinger method (CSM) theoretical framework have conclusively demonstrated the capability of gaining insight into the strong interaction dynamics that underlie EHM. The results on the $g_vpN^*$ electrocouplings from CLAS have allowed us to map out the momentum dependence of the dressed quark mass within the quite limited range of quark momenta < 0.7 GeV, while the results on the $g_vpN^*$ electrocouplings expected from the data of the CLAS12 detector will extend insight into the evolution of the dressed quark mass within the range of quark momenta up to 1.3 GeV. The future results on the electrocouplings of all prominent resonances at photon virtualities up to 35 GeV$^2$ will allow us to map out the momentum dependence of the dressed quark mass within the entire range of quark momenta where the dominant part of hadron mass is expected to be generated up to 2 GeV. Consistent results on the momentum dependence of the dressed quark mass obtained from the CSM analysis of the transition electroexcitation amplitudes to excited states of the nucleon of distinctively different structure will validate credible insight into EHM in a nearly model-independent way. The proposed research addressing key open problems in the Standard Model on the emergence of hadron mass and structure from QCD will make JLab unique after the energy and luminosity increase and the ultimate QCD machine at the luminosity frontier.
