Recent experimental and theoretical advances in investigating electromagnetic meson
production reactions in the nucleon resonance region are reviewed. We give a description of …

The effective restoration of SU (2) L× SU (2) R and U (1) A chiral symmetries of QCD in
excited hadrons is reviewed. While the low-lying hadron spectrum is mostly shaped by the …

An extensive and systematic study of the recent η photo-production data up to 1.2 GeV is
presented within a chiral constituent quark model. A model embodying all known nucleonic …

Parity doubling in excited hadrons is reviewed. Parity degeneracy in hadrons was first
experimentally observed 40 years ago. Recently new experimental data on light mesons …

The spectroscopic predictions of the Ademollo–Veneziano–Weinberg dual model are
critically tested in view of the modern experimental data. The predicted equidistance of …

Tensor, matrix, and quaternion formulations of Dirac–Kähler equation for massive and
massless fields are considered. The equation matrices obtained are simple linear …

We make the case that the Coulomb-plus linear quark confinement potential predicted by
lattice QCD is an approximation to the exactly solvable trigonometric Rosen-Morse potential …

The structure of the reported excitation spectra of light unflavored baryons is described in
terms of multispin valued Lorentz group representations of the so called Rarita-Schwinger …

I will discuss recent results on the electromagnetic excitation of non-strange baryon
resonances obtained with the CEBAF Large Acceptance Spectrometer (CLAS). Preliminary …

The degeneracy among parity pairs systematically observed in the N and Δ spectra is
interpreted to hint on a possible conformal symmetry realization in the light flavor baryon …