Electromagnetic Transition Form Factors of Nucleon Resonances

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 nπ+ production at high Q2 confirm the slow fall off of the S11(1535) transition form factor with Q2, and better constrain the branching ratios βNπ=0.50 and βNη=0.45. Also, new results on the transition amplitudes for the D13(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 Q2.