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 the Invariant Amplitudes A1,...,A6 we use the definition of F.
Berends et al. Nucl. Phys. B4 (1967) 1Channel: (pi0,p) (pi0,n) (pi+,n) (pi-,p)
Amplitudes: CGLN(F1,...,F6) Helicity(H1,...,H6) Invariant(A1,...,A6)
Choose kinematical variables
choose an independent (running)
variable: Q² W θ
choose values for Q², W, θ,
step
size and maximum value:
Q² (GeV/c)²
W (MeV)
θ
(deg)
increment
upper value
click here
Change of model parameters:
(
suppress output )
Born
Rho
Omega
P33(1232)
P11(1440)
D13(1520)
S11(1535)
S31(1620)
S11(1650)
D15(1675)
F15(1680)
D33(1700)
P13(1720)
F35(1905)
P31(1910)
F37(1950)
Change of S-wave low-energy
corrections and type of pi-N coupling (click
here for details)
E0+
S0+
PS-PV mixing range parameter Lambda
Change values of resonance
couplings (relative to default values):
