Using the Single Quark Transition Model to predict nucleon resonance amplitudes
We present predictions for the ∗ N ! N ∗ helicity amplitudes, where N ∗ is a member of the [70,1 − ] supermultiplet. We combine the results from the single quark transition model for the helicity amplitudes with the results of the covariant spectator quark model for the ∗ N ! N ∗ (1535) and ∗ N ! N ∗ (1520) transitions. The theoretical estimations from the covariant spectator quark model are used to calculate three independent functions A,B, and C of Q 2 , where Q 2 = q 2 and q is the momentum transfer. With the knowledge of the functions A,B, and C we estimate the helicity amplitudes for the transitions ∗ N ! N ∗ (1650), ∗ N ! N ∗ (1700), ∗ N ! �(1620), and ∗ N ! �(1700). The analysis is restricted to reactions with proton targets. The predictions for the transition amplitudes are valid for Q 2 > 2 GeV 2 .