The N * Physics Program at Jefferson Lab
نویسندگان
چکیده
Recent measurements of nucleon resonance transition form factors with CLAS at Jefferson Lab are discussed. The new data confirm the assertion of the symmetric constituent quark model of the Roper as the first radial excitation of the nucleon. The data on high Q nπ production better constrain the branching ratios βNπ and βNη for the S11(1535). For the first time, the longitudinal transition amplitude to the S11(1535) was extracted from the nπ data. Also, new results on the transition amplitudes for the D13(1520) resonance are presented showing a rapid transition from helicity 3/2 dominance seen at the real photon point to helicty 1/2 dominance at higher Q. I also discuss aspects of the search for new excited nucleon states in strangeness photoproduction.
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