Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-08-18
AIPConf.Proc.1056:348-356,2008
Physics
Nuclear Physics
Nuclear Experiment
5 pages, 7 figures
Scientific paper
10.1063/1.3013063
Recent measurements of nucleon resonance transition form factors with CLAS at Jefferson Lab are discussed. The new data resolve a long-standing puzzle of the nature of the Roper resonance, and confirm the assertion of the symmetric constituent quark model of the Roper as the first radial excitation of the nucleon. The data on $n\pi^+$ production at high $Q^2$ confirm the slow fall off of the $S_{11}(1535)$ transition form factor with $Q^2$, and better constrain the branching ratios $\beta_{N\pi}=0.50$ and $\beta_{N\eta}=0.45$. Also, new results on the transition amplitudes for the $D_{13}(1520)$ resonance are presented showing a rapid change from helicity 3/2 dominance seen at the real photon point to helicty 1/2 dominance at higher $Q^2$.
No associations
LandOfFree
Electromagnetic Transition Form Factors of Nucleon Resonances 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 Electromagnetic Transition Form Factors of Nucleon Resonances, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electromagnetic Transition Form Factors of Nucleon Resonances will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-697205