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34 lines
1.2 KiB
34 lines
1.2 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 FFPMscTtilde(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.10.22
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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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integer:: j1,j2,j3,j4,j5,j6
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real(dp):: Deltat3,deltat14,deltat56
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complex(dp):: FFPMscTtilde,zab2,zab
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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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c End statement functions
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deltat14=s(j1,j4)-s(j2,j3)-s(j5,j6)
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deltat56=s(j5,j6)-s(j1,j4)-s(j2,j3)
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Deltat3=s(j1,j4)**2+s(j2,j3)**2+s(j5,j6)**2
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& -2*s(j1,j4)*s(j2,j3)-2*s(j2,j3)*s(j5,j6)-2*s(j5,j6)*s(j1,j4)
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FFPMscTtilde=3*za(j1,j4)*zb(j2,j3)*zab2(j2,j3,j4,j1)
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& /(zab2(j3,j1,j2,j4)*Deltat3**2)
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& *((deltat14*zab(j2,j5,j6)-s(j5,j6)*zab(j2,j3,j6))*zab(j5,j4,j1)
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& -0.5_dp*deltat56*zab(j2,j5,j6)*zab(j5,j6,j1))
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& -zab2(j2,j3,j4,j1)/(zab2(j3,j1,j2,j4)*Deltat3)
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& *(0.5_dp*zab(j4,j5,j6)*(zab(j5,j6,j3)+2*zab(j5,j2,j3))
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& -zab(j5,j2,j3)*zab(j4,j1,j6))
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return
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end
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