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maxrat.f
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subroutine do_maxrat(mcalls,icalls,imode,iret)
c imode = -1: load or generate
c imode = 0: force generating
c imode = 1: force load
implicit none
integer imode,iret
include 'pwhg_math.h'
include 'nlegborn.h'
include 'pwhg_flst.h'
include 'pwhg_flg.h'
include 'pwhg_kn.h'
include 'pwhg_rad.h'
include 'pwhg_rnd.h'
integer mcalls,icalls
character * 20 pwgprefix
integer lprefix
common/cpwgprefix/pwgprefix,lprefix
character * 4 chseed
integer nubound,ios,iun,nynormsold,ncsinormsold,
1 icsi,iy,j,k,jfile,nfiles,fl1,fl2,flemitter
real * 8 csiynorms(rad_ncsiynormsmx,
1 rad_ncsiynormsmx,nlegborn-1,maxprocborn)
logical lpresent,loaded,manyfiles,is_coloured,is_charged
real * 8 powheginput,random
external powheginput,random,is_coloured,is_charged
call zerohistnorms
loaded=.false.
nubound=powheginput('nubound')
rad_nynorms=powheginput('#iymax')
if(rad_nynorms.lt.0) rad_nynorms=1
rad_ncsinorms=powheginput('#icsimax')
if(rad_ncsinorms.lt.0) rad_ncsinorms=1
if(rad_nynorms.gt.rad_ncsiynormsmx.or.
# rad_ncsinorms.gt.rad_ncsiynormsmx) then
write(*,*)
# ' error in poweg.input: rad_nynorms or rad_ncsinorms too large'
stop
endif
rad_normfact=powheginput('#xupbound')
if(rad_normfact.lt.0) rad_normfact=2
if(nubound.eq.0) then
write(*,*) ' ubound set =0, cannot proceed'
call write_counters
call exit(1)
endif
call newunit(iun)
c force generation
if(imode.eq.0) goto 111
c force load
if(imode.eq.1) then
call newunit(iun)
open(unit=iun,file=pwgprefix(1:lprefix)//'ubound.dat',
1 status='old',iostat=ios)
if(ios.eq.0) then
nfiles=1
manyfiles=.false.
else
nfiles=9999
manyfiles=.true.
endif
goto 100
endif
c imode = -1, load or generate
if(powheginput('use-old-ubound').eq.1) then
call newunit(iun)
open(unit=iun,file=pwgprefix(1:lprefix)//'ubound.dat',
1 status='old',iostat=ios)
if(ios.eq.0) then
nfiles=1
manyfiles=.false.
else
if(rnd_cwhichseed.ne.'none') then
c Are we required to generate a grid file or to load a bunch of them?v-
c See if the grid file exists already
inquire(file=pwgprefix(1:lprefix)//'ubound-'//
1 rnd_cwhichseed//'.dat',exist=lpresent)
if(.not.lpresent) then
c we must generate it: go to grid computation
goto 111
endif
endif
c try sequence of number files
nfiles=9999
manyfiles=.true.
endif
else
c new grid required: go to grid computation
goto 111
endif
100 continue
do jfile=1,nfiles
if(nfiles.ne.1) then
c sequence of number files
write(chseed,'(i4)') jfile
do j=1,4
if(chseed(j:j).eq.' ') chseed(j:j)='0'
enddo
inquire(file=pwgprefix(1:lprefix)//'ubound-'//
1 chseed//'.dat',exist=lpresent)
c This one is not present: skip it and go to the next
if(.not.lpresent) goto 110
open(unit=iun,file=pwgprefix(1:lprefix)//'ubound-'//
1 chseed//'.dat', status='old',iostat=ios)
c error in loading; assume that grids have to be redone
if(ios.ne.0) goto 111
write(*,*) ' opened ',pwgprefix(1:lprefix)//'ubound-'//
1 chseed//'.dat'
endif
c rad_ncsinorms, rad_nynorms will be overridden by nynormsold,ncsinormsold
c if all goes well
read(iun,fmt=*,iostat=ios,end=111) nynormsold,ncsinormsold
do j=1,flst_nborn
read(iun,fmt=*,iostat=ios,end=111)
do iy=1,nynormsold
read(iun,fmt=*,iostat=ios,end=111)
do icsi=1,ncsinormsold
read(iun,fmt=*,iostat=ios,end=111)
read(iun,fmt=*,iostat=ios,end=111)
1 (csiynorms(icsi,iy,k,j),k=1,rad_nkinreg)
enddo
enddo
enddo
close(iun)
do iy=1,nynormsold
do icsi=1,ncsinormsold
do j=1,flst_nborn
do k=1,rad_nkinreg
if(jfile.eq.1) then
rad_csiynorms(icsi,iy,k,j)=
1 csiynorms(icsi,iy,k,j)
else
rad_csiynorms(icsi,iy,k,j)=max(
1 rad_csiynorms(icsi,iy,k,j),
2 csiynorms(icsi,iy,k,j))
endif
enddo
enddo
enddo
enddo
c all went well: override rad_ncsinorms, rad_nynorms
rad_ncsinorms=ncsinormsold
rad_nynorms=nynormsold
loaded=.true.
110 continue
enddo
if(loaded) then
write(*,*)
1 ' normalization of upper bounding function for radiation',
2 ' successfully loaded'
iret = 0
goto 998
elseif(imode.eq.1) then
iret = -1
return
endif
c Compute and store normalization grid
111 continue
write(*,*)
write(*,*)
# ' POWHEG: computing normalization of upper'//
# ' bounding function for radiation'
do j=1,flst_nborn
do k=1,rad_nkinreg
do iy=1,rad_nynorms
do icsi=1,rad_ncsinorms
rad_csiynorms(icsi,iy,k,j)=0
enddo
enddo
rad_norms(k,j)=0
enddo
enddo
do j=1,nubound
call gen_born(mcalls,icalls)
call gen_uborn_idx
kn_csitilde=random()
kn_y=2*random()-1
kn_azi=2*pi*random()
do rad_kinreg=1,rad_nkinreg
if(rad_kinreg.eq.1.and.rad_kinreg_on(1)) then
c initial state radiation
fl1=flst_born(1,rad_ubornidx)
fl2=flst_born(2,rad_ubornidx)
if((.not.is_coloured(fl1).and..not.is_coloured(fl2))
1 .and.(is_charged(fl1).or.is_charged(fl2))) then
flg_em_rad = .true.
else
flg_em_rad = .false.
endif
c better set kn_emitter<=2 to avoid troubles ...
kn_emitter = 0
call gen_real_phsp_isr_rad0
call inc_norms
elseif(rad_kinreg_on(rad_kinreg)) then
c final state radiation
kn_emitter=flst_lightpart+rad_kinreg-2
flemitter=flst_born(kn_emitter,rad_ubornidx)
if(.not.is_coloured(flemitter).and.is_charged(flemitter))
1 then
flg_em_rad = .true.
else
flg_em_rad = .false.
endif
call gen_real_phsp_fsr_rad0
call inc_norms
endif
enddo
enddo
call evenmaxrat
call newunit(iun)
if(rnd_cwhichseed.eq.'none') then
open(unit=iun,file=pwgprefix(1:lprefix)//'ubound.dat',
1 status='unknown')
else
open(unit=iun,file=pwgprefix(1:lprefix)//'ubound-'
1 //rnd_cwhichseed//'.dat',status='unknown')
endif
write(iun,*) rad_nynorms,rad_ncsinorms, ' n-y and n-csi grid'
do j=1,flst_nborn
write(iun,fmt=*,iostat=ios) j,' Born index'
do iy=1,rad_nynorms
write(iun,fmt=*,iostat=ios) iy, ' i-y'
do icsi=1,rad_ncsinorms
write(iun,fmt=*,iostat=ios) icsi, ' i-csi'
write(iun,fmt=*,iostat=ios)
#(rad_csiynorms(icsi,iy,k,j),k=1,rad_nkinreg)
enddo
enddo
enddo
close(iun)
write(*,*) ' Normalization of upper bounding function'//
1 ' for radiation computed and stored'
call printhistnorms
998 do j=1,flst_nborn
do k=1,rad_nkinreg
do iy=1,rad_nynorms
do icsi=1,rad_ncsinorms
rad_csiynorms(icsi,iy,k,j)=
# rad_csiynorms(icsi,iy,k,j)*rad_normfact
rad_norms(k,j)=max(rad_norms(k,j),
# rad_csiynorms(icsi,iy,k,j))
enddo
enddo
enddo
enddo
c this subroutine identifies the upper bounds for identical
c contributions
c call maxratident
end
subroutine evenmaxrat
implicit none
include 'nlegborn.h'
include 'pwhg_flst.h'
include 'pwhg_flg.h'
include 'pwhg_rad.h'
integer equivto(maxprocborn)
common/cequivtoborn/equivto
integer j,k,iy,icsi,ir
if(.not.flg_evenmaxrat) return
do j=1,flst_nborn
if(equivto(j).eq.-1) then
c first store in j maximum of norms in equivalente amplitudes
do k=1,flst_nborn
if(equivto(k).eq.j) then
do iy=1,rad_nynorms
do icsi=1,rad_ncsinorms
do ir=1,rad_nkinreg
rad_csiynorms(icsi,iy,ir,j)=
1 max(rad_csiynorms(icsi,iy,ir,j),
2 rad_csiynorms(icsi,iy,ir,k))
enddo
enddo
enddo
endif
enddo
c Now set all equivalent amplitudes equal to j
do k=1,flst_nborn
if(equivto(k).eq.j) then
do iy=1,rad_nynorms
do icsi=1,rad_ncsinorms
do ir=1,rad_nkinreg
rad_csiynorms(icsi,iy,ir,k)=
1 rad_csiynorms(icsi,iy,ir,j)
enddo
enddo
enddo
endif
enddo
endif
enddo
end
subroutine inc_norms
implicit none
include 'pwhg_math.h'
include 'nlegborn.h'
include 'pwhg_flst.h'
include 'pwhg_kn.h'
include 'pwhg_rad.h'
real * 8 ptsq,born,sig,xnorm
real * 8 histnorms(nlegborn-1,maxprocborn,100)
real * 8 efficiencies(nlegborn-1,maxprocborn)
common/chistnorms/histnorms,efficiencies
integer icsi,iy,ind,k
logical refuse_pdf
real * 8 pwhg_pt2,pwhg_upperb_rad
external pwhg_pt2,pwhg_upperb_rad
logical debug
parameter (debug=.false.)
ccccccccccccccccccccccccccccccccc
logical verbose
parameter (verbose=.false.)
include 'pwhg_st.h'
include 'pwhg_pdf.h'
include 'pwhg_br.h'
real * 8 pdf1(-pdf_nparton:pdf_nparton),
1 pdf2(-pdf_nparton:pdf_nparton)
cccccccccccccccccccccccccccccccc
ptsq=pwhg_pt2()
if(ptsq.gt.rad_ptsqmin) then
call set_rad_scales(ptsq)
if(.not.refuse_pdf()) then
call sigborn_rad(born)
call sigreal_rad(sig)
sig=sig*kn_jacreal
if(born.le.0) then
if(verbose) then
write(*,*) ' *****************************'
write(*,*) ' inc_norms: Warning, born zero'
write(*,*) ' RAD REG: ', rad_kinreg
write(*,*) ' inc_norms: x1,x2', kn_xb1,kn_xb2
write(*,*) ' muf= ',sqrt(st_mufact2)
write(*,*) ' Flavour: ', (flst_born(ind,rad_ubornidx),ind
$ =1,5)
write(*,*) ' Born w/o pdf: ',br_born(rad_ubornidx)
$ ,' jac: ',kn_jacborn
call pdfcall(1,kn_xb1,pdf1)
call pdfcall(2,kn_xb2,pdf2)
write(*,*) " PDF's ",pdf1(flst_born(1
$ ,rad_ubornidx)),pdf2(flst_born(2,rad_ubornidx))
if ((abs(flst_born(1
$ ,rad_ubornidx)).ge.4).or.(abs(flst_born(2
$ ,rad_ubornidx)).ge.4)) then
write(*,*) ' inc_norms: hvq in initial state!'
else
write(*,*) ' inc_norms: more serious problem!'
endif
write(*,*) ' *****************************'
endif
return
endif
xnorm=sig/born/pwhg_upperb_rad()
if (debug) then
if(xnorm.gt.0.1) then
write(*,*) ' **********************'
write(*,*)
$ ' event with abnormally high ratio to bound:'
$ ,xnorm
call printevent
do k=1,10000
write(*,*) ' enter csitilde,y'
read(*,*) kn_csitilde, kn_y
call gen_real_phsp_isr_rad0
ptsq=pwhg_pt2()
if(ptsq.gt.rad_ptsqmin) then
call set_rad_scales(ptsq)
call sigreal_rad(sig)
sig=sig*kn_jacreal
xnorm=sig/born/pwhg_upperb_rad()
write(*,*) 'xnorm:',
$ xnorm
call printevent
endif
enddo
endif
if(xnorm.gt.3e-5.and.xnorm.lt.3.1e-5) then
write(*,*) ' **********************'
write(*,*) ' typical event:',
$ xnorm
call printevent
endif
endif
else
return
endif
else
return
endif
c fill the norm array
iy=abs(kn_y)*rad_nynorms+1
icsi=log(1/(1-kn_csi))/log(kn_sbeams/kn_minmass**2)
1 *rad_ncsinorms+1
c
if(iy.lt.1) iy=1
if(iy.gt.rad_nynorms) iy=rad_nynorms
if(icsi.lt.1) icsi=1
if(icsi.gt.rad_ncsinorms) icsi=rad_ncsinorms
c
rad_csiynorms(icsi,iy,rad_kinreg,rad_ubornidx)=
# max(xnorm,rad_csiynorms(icsi,iy,rad_kinreg,rad_ubornidx))
rad_norms(rad_kinreg,rad_ubornidx)=
# max(xnorm,rad_norms(rad_kinreg,rad_ubornidx))
if(xnorm.gt.0) then
ind=log(xnorm)+50
else
ind=-100
endif
ind=max(ind,1)
ind=min(ind,100)
efficiencies(rad_kinreg,rad_ubornidx)=
# efficiencies(rad_kinreg,rad_ubornidx)+xnorm
histnorms(rad_kinreg,rad_ubornidx,ind)=
# histnorms(rad_kinreg,rad_ubornidx,ind)+1
end
subroutine printevent
implicit none
include 'pwhg_math.h'
include 'nlegborn.h'
include 'pwhg_flst.h'
include 'pwhg_kn.h'
include 'pwhg_rad.h'
real * 8 pwhg_pt2
external pwhg_pt2
integer j,k,alr,mu
write(*,*) 'kinematic region (1=isr,>2=fsr)',rad_kinreg
write(*,*) ' born flavour:'
write(*,*)
# (flst_born(j,rad_ubornidx),j=1,nlegborn)
write(*,*) ' real flavour:'
do k=1,flst_born2alr(0,rad_ubornidx)
alr=flst_born2alr(k,rad_ubornidx)
write(*,*) (flst_alr(j,alr),j=1,nlegreal)
enddo
write(*,*) ' pt', sqrt(pwhg_pt2())
write(*,*) ' x1,x2 = ', kn_x1, kn_x2
write(*,*) ' underlying born x1,x2', kn_xb1, kn_xb2
write(*,*) ' y, csi:', kn_y,kn_csi
c write(*,*) ' born pt', sqrt(kn_born_pt2)
c write(*,*) ' cosine decay angle', kn_cthdec
write(*,*) ' born cm kinematics'
do k=1,nlegborn
write(*,100) (kn_cmpborn(mu,k),mu=0,3)
enddo
100 format('[',3(d14.8,','),d14.8,'],')
end
subroutine printhistnorms
implicit none
include 'nlegborn.h'
include 'pwhg_flst.h'
include 'pwhg_rad.h'
real * 8 ptsq,born,sig,xnorm
real * 8 histnorms(nlegborn-1,maxprocborn,100)
real * 8 efficiencies(nlegborn-1,maxprocborn)
common/chistnorms/histnorms,efficiencies
integer iun,ireg,iborn,j
real * 8 x1,x2,xm,dx
real * 8 powheginput
external powheginput
call newunit(iun)
open(iun,status='unknown',file='pwghistnorms.top')
do ireg=1,rad_nkinreg
do iborn=1,flst_nborn
write(iun,*)'set scale x log'
write(iun,*)'set order x dx y'
write(iun,*)'set limits x 1e-14 1e14'
write(iun,*)'title top "region=',ireg,', born=',iborn,'"'
do j=1,100
x1=exp(j-50d0)
x2=exp(j+1-50d0)
xm=(x1+x2)/2
dx=x2-xm
write(iun,*) xm,dx,histnorms(ireg,iborn,j)
enddo
write(iun,*)' hist'
if (rad_norms(ireg,iborn).ne.0d0) then
write(iun,*) 'title bottom " efficiency',
1 efficiencies(ireg,iborn)/powheginput('nubound')/
2 rad_norms(ireg,iborn),'"'
endif
write(iun,*)' newplot'
enddo
enddo
c do ireg=1,rad_nkinreg
c do iborn=1,flst_nborn
c write(iun,*)'( efficiencies: region=',ireg,', born=',iborn
c write(iun,*) '(', efficiencies(ireg,iborn)/
c 1 powheginput('nubound')/rad_norms(ireg,iborn)
c enddo
c enddo
close(iun)
end
subroutine zerohistnorms
implicit none
include 'nlegborn.h'
include 'pwhg_flst.h'
include 'pwhg_rad.h'
real * 8 ptsq,born,sig,xnorm
real * 8 histnorms(nlegborn-1,maxprocborn,100)
real * 8 efficiencies(nlegborn-1,maxprocborn)
common/chistnorms/histnorms,efficiencies
integer ireg,iborn,j
do ireg=1,rad_nkinreg
do iborn=1,flst_nborn
efficiencies(ireg,iborn)=0
do j=1,100
histnorms(ireg,iborn,j)=0
enddo
enddo
enddo
end
function refuse_pdf()
c Some pdf have (inconsistently) vanishing quark density at x values
c when the gluon density is not zero; cannot use these points to compute
c maxrat
implicit none
logical refuse_pdf
include 'nlegborn.h'
include 'pwhg_flst.h'
include 'pwhg_kn.h'
include 'pwhg_rad.h'
include 'pwhg_st.h'
include 'pwhg_pdf.h'
real * 8 pdf(-pdf_nparton:pdf_nparton),sn,suppfc,x
integer k,j,fl
suppfc(x)=(1-x)*x
c in FKS, for final state radiation, pdf always cancel in real/born
if(rad_kinreg.ne.1) then
refuse_pdf=.false.
return
endif
if(st_mufact2.lt.2.or.kn_x1.gt.0.9.or.kn_x2.gt.0.9) then
refuse_pdf=.true.
return
endif
do k=1,2
if(k.eq.1) then
fl=flst_born(1,rad_ubornidx)
x=kn_xb1
call pdfcall(1,x,pdf)
else
fl=flst_born(2,rad_ubornidx)
x=kn_xb2
call pdfcall(2,x,pdf)
endif
sn=0
do j=1,5
sn=sn+pdf(j)+pdf(-j)
enddo
if(fl.eq.0) then
if(sn*suppfc(x).gt.30*pdf(0)) then
refuse_pdf=.true.
return
endif
else
if(pdf(0)*suppfc(x).gt.30*pdf(fl)) then
refuse_pdf=.true.
return
endif
endif
enddo
refuse_pdf=.false.
end
subroutine uboundfct(fct,csi,y)
implicit none
include 'pwhg_math.h'
include 'nlegborn.h'
include 'pwhg_flst.h'
include 'pwhg_kn.h'
include 'pwhg_rad.h'
real * 8 fct,csi,y
real * 8 unorm
integer iy,icsi
iy=abs(y)*rad_nynorms+1
icsi=log(1/(1-csi))/log(kn_sbeams/kn_minmass**2)*rad_ncsinorms+1
c
if(iy.lt.1) iy=1
if(iy.gt.rad_nynorms) iy=rad_nynorms
if(icsi.lt.1) icsi=1
if(icsi.gt.rad_ncsinorms) icsi=rad_ncsinorms
c
unorm=rad_norms(rad_kinreg,rad_ubornidx)
if(unorm.ne.0) then
fct=rad_csiynorms(icsi,iy,rad_kinreg,rad_ubornidx)/unorm
else
fct=1
endif
end
subroutine gen_born(mcalls,icalls)
implicit none
include 'nlegborn.h'
include 'pwhg_flst.h'
include 'pwhg_flg.h'
integer mcalls,icalls
integer ndimbornint
parameter (ndimbornint=ndiminteg-3)
real * 8 xgrid(0:50,ndimbornint),ymax(50,ndimbornint),
1 ymaxrat(50,ndimbornint),xacc(0:50,ndimbornint),
1 xmmm(0:50,ndimbornint),xint,sigbtl,errbtl
integer ifold(ndimbornint),nhits(0:50,ndimbornint),ncall1,ncall2,
1 itmx1,itmx2,imode,j,k,iun
character * 20 pwgprefix
integer lprefix
common/cpwgprefix/pwgprefix,lprefix
logical savenlotest,save_storemintupb,save_fastbtlbound,ini,
1 save_monitorubound
data ini/.true./
real * 8 xx(ndimbornint)
real * 8 btilde,powheginput
external btilde,powheginput
save xgrid,ymax,xmmm,ini,ifold
if(flg_bornonly) then
call gen_btilde(mcalls,icalls)
return
endif
flg_bornonly=.true.
save_storemintupb = flg_storemintupb
save_fastbtlbound = flg_fastbtlbound
save_monitorubound = flg_monitorubound
flg_storemintupb = .false.
flg_fastbtlbound = .false.
flg_monitorubound = .false.
c
savenlotest=flg_nlotest
flg_nlotest=.false.
if(ini) then
write(*,'(/,a,/,a)')
1 ' Initializing grids for the generation of the underlying',
1 ' Born configurations according to the Born cross section'
c set up the grids
do j=1,ndimbornint
do k=0,50
xgrid(k,j)=0
xmmm(k,j)=0
enddo
do k=1,50
ymax(k,j)=0
enddo
ifold(j)=1
enddo
call initxgrid(xgrid,ndimbornint)
call newunit(iun)
open(unit=iun,file=pwgprefix(1:lprefix)//'borngrid.top',
1 status='unknown')
imode=0
ncall1=powheginput('ncall1')
itmx1=powheginput('itmx1')
c This is not really needed; the accumulated totals
c will not be used;
call resettotals
call mint(btilde,ndimbornint,ncall1,itmx1,ifold,imode,iun,
1 xgrid,xint,xacc,nhits,ymax,ymaxrat,sigbtl,errbtl)
close(iun)
imode=1
ncall2=powheginput('ncall2')
itmx2=powheginput('itmx2')
call mint(btilde,ndimbornint,ncall2,itmx2,ifold,imode,iun,
1 xgrid,xint,xacc,nhits,ymax,ymaxrat,sigbtl,errbtl)
call gen(btilde,ndimbornint,xgrid,ymax,ymaxrat,xmmm,ifold,0,
1 mcalls,icalls,xx)
ini=.false.
endif
C - N.B. if -fno-automatic isn't used the ifold array may need reset to 1 here.
call gen(btilde,ndimbornint,xgrid,ymax,ymaxrat,xmmm,ifold,1,
# mcalls,icalls,xx)
flg_nlotest=savenlotest
flg_bornonly=.false.
flg_storemintupb = save_storemintupb
flg_fastbtlbound = save_fastbtlbound
flg_monitorubound = save_monitorubound
end