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1 * $Id$
2 C
3 C
4 C
5 C
6         FUNCTION G(Y1,Y2,PT2)
7         IMPLICIT REAL*8 (A-H,O-Z)
8 #define BLANKET_SAVE
9 #include "hiparnt.inc"
10         DIMENSION F(2,7)
11         SAVE
12         XT=2.0*DSQRT(PT2)/HINT1(1)
13         X1=0.50*XT*(DEXP(Y1)+DEXP(Y2))
14         X2=0.50*XT*(DEXP(-Y1)+DEXP(-Y2))
15         DUMMY = 1.D0-XT**2/X1/X2
16         if (DUMMY.LT.0.D0) DUMMY = 0.D0
17         Z=DSQRT(DUMMY)
18         SS=X1*X2*HINT1(1)**2
19         T=-(1.0-Z)/2.0
20         U=-(1.0+Z)/2.0
21         AF=3.0
22         DLAM=HIPR1(15)
23         APH=12.0*3.1415926/(33.0-2.0*AF)/DLOG(PT2/DLAM**2)
24 C
25         CALL PARTON(F,X1,X2,PT2)
26 C
27         G11=( (F(1,1)+F(1,2))*(F(2,3)+F(2,4)+F(2,5)+F(2,6))
28      &      +(F(1,3)+F(1,4))*(F(2,5)+F(2,6)) )*SUBCRS1(T,U)
29 C
30         G12=( (F(2,1)+F(2,2))*(F(1,3)+F(1,4)+F(1,5)+F(1,6))
31      &      +(F(2,3)+F(2,4))*(F(1,5)+F(1,6)) )*SUBCRS1(U,T)
32 C
33         G13=(F(1,1)*F(2,1)+F(1,2)*F(2,2)+F(1,3)*F(2,3)+F(1,4)*F(2,4)
34      &      +F(1,5)*F(2,5)+F(1,6)*F(2,6))*(SUBCRS1(U,T)
35      &      +SUBCRS1(T,U)-8.D0/T/U/27.D0)
36 C
37         G2=(AF-1)*(F(1,1)*F(2,2)+F(2,1)*F(1,2)+F(1,3)*F(2,4)
38      &     +F(2,3)*F(1,4)+F(1,5)*F(2,6)+F(2,5)*F(1,6))*SUBCRS2(T,U)
39 C
40         G31=(F(1,1)*F(2,2)+F(1,3)*F(2,4)+F(1,5)*F(2,6))*SUBCRS3(T,U)
41         G32=(F(2,1)*F(1,2)+F(2,3)*F(1,4)+F(2,5)*F(1,6))*SUBCRS3(U,T)
42 C
43         G4=(F(1,1)*F(2,2)+F(2,1)*F(1,2)+F(1,3)*F(2,4)+F(2,3)*F(1,4)+
44      1  F(1,5)*F(2,6)+F(2,5)*F(1,6))*SUBCRS4(T,U)
45 C
46         G5=AF*F(1,7)*F(2,7)*SUBCRS5(T,U)
47 C
48         G61=F(1,7)*(F(2,1)+F(2,2)+F(2,3)+F(2,4)+F(2,5)
49      &      +F(2,6))*SUBCRS6(T,U)
50         G62=F(2,7)*(F(1,1)+F(1,2)+F(1,3)+F(1,4)+F(1,5)
51      &      +F(1,6))*SUBCRS6(U,T)
52 C
53         G7=F(1,7)*F(2,7)*SUBCRS7(T,U)
54 C
55         G=(G11+G12+G13+G2+G31+G32+G4+G5+G61+G62+G7)*HIPR1(17)*
56      1  3.14159D0*APH**2/SS**2
57         RETURN
58         END