CGLN and Helicity Amplitudes
The following relations between CGLN amplitudes and helicity amplitudes will be used in our calculations.

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: (pi0,p) (pi0,n) (pi+,n) (pi-,p)
Amplitudes: CGLN(F1,...,F6) Helicity(H1,...,H6)
Model parameters: Born Rho Omega P33M(1232) P33E(1232)

P11(1440) D13(1520) S11(1535) S11(1650) F15(1680) D33(1700)

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Enter (lower) values for Q², W and Theta :

[ Q² (GeV/c)² ] [ W (MeV) ] [ Theta (deg) ]

Choose one independent (running) variable: Q² W Theta

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