Speaker
Description
The study of baryonic excited states provides fundamental information on the internal
structure of the nucleon and on the degrees of freedom that are relevant for QCD at low
energies. N* are composite states and are sensitive to details of the how quarks are
confined. Meson photo-and electro-production reactions have provided complementary
information on light quark baryon spectroscopy for several decades, but a crucial step
forward has been the advent of large solid angle detectors, together with polarized
beam and targets, which gave access to single and double polarization observables. The
Q 2 dependence of excited baryons electro-couplings has also been measured, gaining
insight into the internal structure of baryons.
The CLAS12 energy upgrade opened an “exciting” new era in baryon spectroscopy,
including the search for hybrid hadrons, in which gluons appear as constituent
components beyond the valence quarks.
