Structure of the Nucleon and its Excitations
- Prof. Derek LEINWEBER
- Prof. Derek LEINWEBER (University of Adelaide)
This presentation will examine the structure of the ground state nucleon and its finite-volume excitations from three different perspectives.
Using new techniques to extract the relativistic components of the nucleon wave function, we'll explore the node structure of both upper and lower components of the nucleon wave function and reveal the manner in which a non trivial role for gluonic components is manifest in the results.
In the second approach, we'll use the parity-expanded variational analysis (PEVA) technique to isolate states at finite momenta and examine the electric and magnetic form factors of nucleon excitations. Here the magnetic form factors of low-lying odd-parity nucleons are particularly interesting.
Finally, the structure of the nucleon spectrum will be examined in a Hamiltonian effective field theory analysis incorporating recent lattice-QCD determinations of low-lying two-particle scattering-state energies in the finite volume. We find the Roper resonance of Nature to originate from multi-particle coupled-channel interactions while the first radial excitation of the nucleon sits much higher at approximately 1.9 GeV.
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