The main focus of Prof. Joo's research is in electromagnetic excitation of
nucleon resonances
(N* physics). The study of N* physics is
aimed at understanding the internal structure and dynamics
of the nucleon and addressing long-standing questions about the relevant
sub-nucleon degrees of freedom
in the low and medium Q2 realm of non-perturbative QCD.
An extensive experimental program of N* physics
has been approved and is currently being carried out using
CEBAF Large Acceptance Spectrometer (CLAS)
at Hall B of
Jefferson Lab.
CLAS has a nearly full solid angle coverage
and the capability of collecting data for many hadronic final states,
simultaneously operating with polarized electron beam and polarized
targets. These features make CLAS uniquely suited for the N* physics
program. This experimental program will produce a data base with high statistics
and large kinematic coverage for invariant mass W up to 2 GeV and
will provide new insight into the structure of the nucleon.
