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(F
Model input (on and off):
Background: Born  r (770) w(783)
Resonances:  S11(1535)  S11(1650)  P11(1710) P13(1720)
D13(1520)  D13(1700)  D15(1675) F15(1680)

Vector meson exchange: r and w poles r and w Regge trajectories 
Choose kinematical variables:

choose an independent (running) variable: Qh
choose values for W, Qh, step size and maximum value:
W (MeV)
Qh (deg)
upper value

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