ly .ub.tltatlog action (37) into Equation (33). th. integral over L, to given 



by 



^ U( c l^u , e l M - a I ^ _ e _ Uo(z - lw+ ) { Ho(7 . lSf)] - »] 



lo (T-i«_) {E r^ (7-i3.)]M 2 ^.r:- <0 (43> 



w+, u_ > o 



3 r Che integral path. L,. ve change the variable a* follows: 



Fo 



v - (u - u ) (7 + iS) with u - u+ °* "-J 



then, the «ew integral path 1. given in Figure 6. With this new variable, the 

 lntagr.1 path. L 2 . Is no. C^ ploying the ss.e procedure ae used previously 



i ~,- t fhe integral over L„ becossea 

 to evaluate the integral over Lj, tne im.s.gi«i 2 



iw + u + _~lw_u^ „ ( , + j^) (., r /- ^ *~ \1 * 2wl 



u '*? "- 

 o 



J «-™V« lM + U + * > du - e U ° (s + iW+> W-»o<« * £+>! + "I 



/— t j~ n — ~ i 2r J , u*. w- < o (44) 

 1 w + , w_ > o 



13 



