The integration of formula () gives the total cross-section
[], [] for Möller scattering (-
and for Bhabha scattering (+
where
2= 1-{1
| |
| |
1=2-y2 | 2=(1-2y)(3+y2)
|
3=(1-2y)2+(1-2y)3 | 4=(1-2y)3
|
The formulae [] and [
]
give the total cross-section of the scattering
above the threshold energies
Mollerthr=2DCUTE&sp;and&sp;TBhabhathr= DCUTE
The interaction length for the production of -rays is calculated during initialisation by routine GDRSGA.