CGLN and Helicity Amplitudes
The following relations between CGLN amplitudes and helicity amplitudes will be used in our calculations.
(click here for a larger image)

Further details can be found in D. Drechsel and L. Tiator , J. Phys. G 18 (1992) 449-497 (scanned version) (for expressions with CGLN amplitudes) and G. Knöchlein, D. Drechsel and L. Tiator, Z. Phys. A 352 (1995) 327-343 (for expressions with helicity amplitudes) postscript compressed (431 kB) and nucl-th/9506029 .

Channel:   proton 
Amplitudes: CGLN(F1,...,F6) Helicity(H1,...,H6) 
Model input (on and off):
Background:  r(770) w(783)
Resonances:  S11      P11 P13
Choose a resonance fit:
         S11 + (r, w) Regge trajectories
  S11 + P11 + (r, w) Regge trajectories
  S11 + P13 + (r, w) Regge trajectories
Choose kinematical variables:
choose an independent (running) variable: W Qh'
choose values for W, Qh' , step size and maximum value:
W (MeV)
Qh' (deg)
increment
upper value
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