CGLN, Helicity and Invariant 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:  K+L  K0L  K+S0 K0S+ K+S-  K0S0
Amplitudes: CGLN(F1,...,F6) Helicity(H1,...,H6) Invariant Amplitudes(A1,...,A6) 
Model input (on and off): Born K* (893)K1(1270)
Resonances in KL:S11(1650)P11(1710)P13(1720) D13(1900) (missing resonance)
Resonances in KS:S11(1650)P11(1710) P13(1720) S31(1900) P31(1910) 
Change values of Born couplings, relative to standard values: gKLN = -13.47, gKSN = 4.25 (no factors of 4p):
gKLN
gKSN
Change values of vector meson couplings GV,T =  ggKK* gV,TK*YN (relative to standard values):
K* (893)
K1(1270)
GV
GT
GV
GT

Change values of resonance couplings G1,2,3 =   g1,2,3gNN* gKYN (relative to standard values):
KL and KS
S11(1650)
P11(1710)
P13(1720)
G1
G3
G1
G3
 G1
G2
G3

 
KL only
KS only
D13(1900)
S31(1900)
 P31(1910)
G1
G2
G3
G1
G3
G1
G3


Choose kinematical variables

choose an independent (running) variable: Q² W QK

choose values for Q², W, QK, step size and maximum value:
Q² (GeV/c)²
W (MeV)
QK (deg)
increment
upper value

Back to Kaon Electroproduction Main Page