The N* physics program at Jefferson Lab

  • 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 Q2+ production better constrain the branching ratios β and β. 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 Q2. I also discuss the status of the search for new excited nucleon states.

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Volker D. Burkert (for the CLAS collaboration). The N* physics program at Jefferson Lab[J]. Chinese Physics C, 2009, 33(12): 1043-1050. doi: 10.1088/1674-1137/33/12/001
Volker D. Burkert (for the CLAS collaboration). The N* physics program at Jefferson Lab[J]. Chinese Physics C, 2009, 33(12): 1043-1050.  doi: 10.1088/1674-1137/33/12/001 shu
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Received: 2009-08-07
Revised: 1900-01-01
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The N* physics program at Jefferson Lab

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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 Q2+ production better constrain the branching ratios β and β. 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 Q2. I also discuss the status of the search for new excited nucleon states.

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