Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-07-12
Physics
High Energy Physics
High Energy Physics - Phenomenology
Replaced one figure, corrected reference, corrected typos
Scientific paper
I discuss recent results on the electroproduction and photoproduction of mesons in the region of non-strange baryon resonances. Results on the quadrupole transition from the ground state nucleon to the Delta(1232) show the importance of pion cloud contributions to explain the observed quadrupole transition multipoles. The excitation of the "Roper" resonance is being studied in single pion production using unpolarized cross sections measurements and beam spin asymmetries. New results on the S_{11}(1535) transition formfactor give now a consistent picture over a large Q2 range. First results on electroproduction of p pi^+ pi^- show intruiging resonance structure. which is difficult to explain in an isobar model fit using known resonance properties, and may hint at excitation of a "missing" resonance. Searches for resonances in K^+Lambda also reveal resonance-like behavior. I briefly address a new avenue of N* physics using exclusive deeply virtual Compton scattering, recently measured for the first time at JLAB and at DESY.
No associations
LandOfFree
The N* Program at Jefferson Lab - Status and Prospects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The N* Program at Jefferson Lab - Status and Prospects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The N* Program at Jefferson Lab - Status and Prospects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-710085