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73 lines
2.5 KiB
73 lines
2.5 KiB
!
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! SPDX-License-Identifier: GPL-3.0-or-later
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! Copyright (C) 2019-2022, respective authors of MCFM.
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!
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function FFPMccT(j1,j2,j3,j4,j5,j6,za,zb)
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c Z. Bern, L. Dixon, D.A. Kosower, e-Print:hep-ph/9708239
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c Eq.10.17
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implicit none
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include 'types.f'
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include 'mxpart.f'
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include 'zprods_decl.f'
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include 'sprods_com.f'
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complex(dp):: FFPMccT,zab2,zab,zba
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integer:: j1,j2,j3,j4,j5,j6
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real(dp):: t,delta12,delta34
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c Statement functions
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zab2(j1,j2,j3,j4)=za(j1,j2)*zb(j2,j4)+za(j1,j3)*zb(j3,j4)
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zab(j1,j2,j3)=za(j1,j2)*zb(j2,j3)
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zba(j1,j2,j3)=zb(j1,j2)*za(j2,j3)
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c End statement functions
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delta12=s(j1,j2)-s(j3,j4)-s(j5,j6)
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delta34=s(j3,j4)-s(j5,j6)-s(j1,j2)
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FFPMccT=
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& -za(j2,j4)**2*zb(j1,j6)*zab2(j5,j2,j4,j3)
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& /(za(j2,j3)*t(j2,j3,j4)**2)
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& +0.5_dp*zb(j1,j3)*za(j2,j4)*za(j2,j5)*zab2(j5,j2,j4,j3)
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& /(za(j2,j3)*zb(j3,j4)*za(j5,j6)*t(j2,j3,j4))
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& +0.5_dp*za(j2,j4)**2*zb(j1,j6)*zab2(j4,j1,j3,j6)
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& /(za(j2,j3)*za(j3,j4)*zb(j5,j6)*t(j2,j3,j4))
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& -za(j4,j5)*zab(j2,j1,j3)*zab2(j2,j1,j3,j6)
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& /(za(j2,j3)*t(j1,j2,j3)*zab2(j1,j2,j3,j4))
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& +0.5_dp/(zab2(j1,j2,j3,j4)*zab2(j1,j3,j4,j2))
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& *(4*zab(j5,j1,j6)*zab(j4,j2,j3)*zab2(j1,j2,j4,j3)/t(j2,j3,j4)
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& +zab2(j1,j2,j4,j3)*zab2(j5,j2,j4,j3)**2
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& *(2*s(j3,j4)*s(j5,j6)+delta12*t(j2,j3,j4))
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& /(zb(j3,j4)*za(j5,j6)*t(j2,j3,j4)**2)
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& +zab(j5,j1,j3)**2
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& *(za(j1,j2)*delta12+zab2(j1,j2,j3,j4)*za(j4,j2))
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& /(za(j2,j3)*zb(j3,j4)*za(j5,j6))
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& +za(j2,j4)**3*zb(j2,j6)**2*zab2(j1,j2,j3,j4)
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& /(za(j2,j3)*za(j3,j4)*zb(j5,j6))
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& -za(j2,j4)*za(j4,j5)
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& *zab2(j1,j2,j3,j4)*(zab(j4,j1,j6)-zab(j4,j2,j6))
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& /(za(j2,j3)*za(j3,j4))
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& +za(j1,j2)*zb(j3,j6)*(zab(j5,j1,j3)-zab(j5,j2,j3))
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& *(s(j2,j3)+t(j1,j3,j4))/(za(j2,j3)*zb(j3,j4))
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& -za(j1,j2)*za(j4,j5)/za(j2,j3)
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& *(zb(j3,j6)*(2*s(j2,j4)+delta34)-2*zba(j3,j1,j5)*zb(j5,j6)))
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& +0.5_dp/(zab2(j1,j2,j3,j4)*zab2(j1,j3,j4,j2)*zab2(j3,j1,j2,j4))
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& *(zab(j1,j4,j6)
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& *(zab(j5,j1,j3)*s(j1,j3)-zab(j5,j2,j3)*s(j2,j3))
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& +5*zab(j1,j2,j4)*zab(j4,j1,j3)*zab(j5,j4,j6)
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& +zab(j5,j4,j3)*zab2(j1,j2,j3,j6)*(s(j1,j3)-s(j2,j4))
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& +zab(j1,j2,j3)
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& *(zab(j5,j2,j6)*s(j3,j4)
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& +zab(j5,j4,j6)*s(j1,j3)
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& +2*zab(j2,j1,j4)*za(j4,j3)*zab2(j5,j1,j3,j6)/za(j2,j3)
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& +3*(za(j5,j4)*zb(j4,j3)*za(j3,j1)*zb(j1,j6)
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& -zab(j5,j3,j6)*s(j2,j4))
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& -2*(zab(j5,j1,j6)*(s(j1,j4)+s(j2,j4))
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& +za(j5,j1)*zb(j1,j4)*za(j4,j3)*zb(j3,j6))))
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return
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end
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