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45 lines
1.3 KiB
45 lines
1.3 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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subroutine qqb_dm_monojet_v_Samps(p,i1,i2,i3,i4,i5,qgqb)
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implicit none
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include 'types.f'
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c----- combined colour and Born intefered amplitudes as a function of quark line helicity
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c------ default is q(i1)+g(i2)+qb(i3)+x(i4)+x(i5)
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include 'constants.f'
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include 'mxpart.f'
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include 'qcdcouple.f'
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real(dp):: qgqb(2)
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integer:: i1,i2,i3,i4,i5
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real(dp):: p(mxpart,4)
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integer:: h1,h2,h3,h4
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complex(dp):: amp_tree(2,2,2,2),amp_lc(2,2,2,2),
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& amp_slc(2,2,2,2)
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c------ tree
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call qqb_dm_monojet_Samps(p,i1,i2,i3,i4,i5,amp_tree)
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c------ leading colour
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call qqb_dm_monojet_lc_Samps(p,i1,i2,i3,i4,i5,amp_lc)
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c------ subleading colour (swap i2 and i3)
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call qqb_dm_monojet_slc_Samps(p,i1,i3,i2,i4,i5,amp_slc)
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qgqb(:)=0d0
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do h1=1,2
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do h2=1,2
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do h3=1,2
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do h4=1,2
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qgqb(h1)=qgqb(h1)
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& +ason2pi*Dble(conjg(amp_tree(h1,h2,h3,h4))*
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& (amp_lc(h1,h2,h3,h4)
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& -amp_slc(h1,h2,h3,h4)/xnsq))
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enddo
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enddo
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enddo
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enddo
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return
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end
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