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subroutine pftopdg(ih,x,q,pdf)
c***************************************************************************
c Wrapper for calling the pdf of MCFM
c***************************************************************************
implicit none
c
c Arguments
c
DOUBLE PRECISION x,q,pdf(-7:7)
INTEGER IH
C
C Include
C
include 'pdf.inc'
C
call fdist(ih,x, q, pdf)
return
end
subroutine fdist(ih,x,xmu,fx)
C***********************************************************************
C MCFM PDF CALLING ROUTINE
C***********************************************************************
implicit none
integer ih
double precision fx(-7:7),x,xmu
double precision u_val,d_val,u_sea,d_sea,s_sea,c_sea,b_sea,gluon
double precision Ctq3df,Ctq4Fn,Ctq5Pdf,Ctq6Pdf,Ctq5L
double precision q2max
double precision epa_electron,epa_proton
include 'pdf.inc'
integer mode,Iprtn,Irt
do Iprtn=-7,7
fx(Iprtn)=0d0
enddo
C---set to zero if x out of range
if (x .ge. 1d0) then
return
endif
if ((pdlabel(1:3) .eq. 'mrs')
. .or. (pdlabel(2:4) .eq. 'mrs')) then
if (pdlabel .eq. 'mrs02nl') then
mode=1
call mrst2002(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs02nn') then
mode=2
call mrst2002(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs0119') then
mode=1
call mrst2001(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs0117') then
mode=2
call mrst2001(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs0121') then
mode=3
call mrst2001(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs01_j') then
mode=4
call mrst2001(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs99_1') then
mode=1
call mrs99(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs99_2') then
mode=2
call mrs99(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs99_3') then
mode=3
call mrs99(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs99_4') then
mode=4
call mrs99(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs99_5') then
mode=5
call mrs99(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs99_6') then
mode=6
call mrs99(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs99_7') then
mode=7
call mrs99(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs99_8') then
mode=8
call mrs99(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs99_9') then
mode=9
call mrs99(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs9910') then
mode=10
call mrs99(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs9911') then
mode=11
call mrs99(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs9912') then
mode=12
call mrs99(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs98z1') then
mode=1
call mrs98(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs98z2') then
mode=2
call mrs98(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs98z3') then
mode=3
call mrs98(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs98z4') then
mode=4
call mrs98(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs98z5') then
mode=5
call mrs98(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs98l1') then
mode=1
call mrs98lo(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs98l2') then
mode=2
call mrs98lo(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs98l3') then
mode=3
call mrs98lo(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs98l4') then
mode=4
call mrs98lo(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs98l5') then
mode=5
call mrs98lo(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
elseif (pdlabel .eq. 'mrs98ht') then
mode=1
call mrs98ht(x,xmu,mode,u_val,d_val,u_sea,d_sea,
& s_sea,c_sea,b_sea,gluon)
endif
c-----assign mrs to standard grid
fx(-5)=b_sea/x
fx(-4)=c_sea/x
fx(-3)=s_sea/x
fx( 0)=gluon/x
fx(+3)=fx(-3)
fx(+4)=fx(-4)
fx(+5)=fx(-5)
fx(1)=(d_val+d_sea)/x
fx(2)=(u_val+u_sea)/x
fx(-1)=d_sea/x
fx(-2)=u_sea/x
C
elseif (pdlabel(1:5) .eq. 'cteq3') then
C
if (pdlabel .eq. 'cteq3_m') then
mode=1
elseif (pdlabel .eq. 'cteq3_l') then
mode=2
elseif (pdlabel .eq. 'cteq3_d') then
mode=3
endif
fx(-5)=Ctq3df(mode,-5,x,xmu,Irt)/x
fx(-4)=Ctq3df(mode,-4,x,xmu,Irt)/x
fx(-3)=Ctq3df(mode,-3,x,xmu,Irt)/x
fx(0)=Ctq3df(mode,0,x,xmu,Irt)/x
fx(+3)=Ctq3df(mode,+3,x,xmu,Irt)/x
fx(+4)=Ctq3df(mode,+4,x,xmu,Irt)/x
fx(+5)=Ctq3df(mode,+5,x,xmu,Irt)/x
fx(-1)=Ctq3df(mode,-2,x,xmu,Irt)/x
fx(-2)=Ctq3df(mode,-1,x,xmu,Irt)/x
fx(1)=Ctq3df(mode,+2,x,xmu,Irt)/x+fx(-1)
fx(2)=Ctq3df(mode,+1,x,xmu,Irt)/x+fx(-2)
C
elseif (pdlabel(1:5) .eq. 'cteq4') then
C
if (pdlabel .eq. 'cteq4_m') then
mode=1
elseif (pdlabel .eq. 'cteq4_d') then
mode=2
elseif (pdlabel .eq. 'cteq4_l') then
mode=3
elseif (pdlabel .eq. 'cteq4a1') then
mode=4
elseif (pdlabel .eq. 'cteq4a2') then
mode=5
elseif (pdlabel .eq. 'cteq4a3') then
mode=6
elseif (pdlabel .eq. 'cteq4a4') then
mode=7
elseif (pdlabel .eq. 'cteq4a5') then
mode=8
elseif (pdlabel .eq. 'cteq4hj') then
mode=9
elseif (pdlabel .eq. 'cteq4lq') then
mode=10
endif
fx(-5)=Ctq4Fn(mode,-5,x,xmu)
fx(-4)=Ctq4Fn(mode,-4,x,xmu)
fx(-3)=Ctq4Fn(mode,-3,x,xmu)
fx(0)=Ctq4Fn(mode,0,x,xmu)
fx(+3)=Ctq4Fn(mode,+3,x,xmu)
fx(+4)=Ctq4Fn(mode,+4,x,xmu)
fx(+5)=Ctq4Fn(mode,+5,x,xmu)
fx(1)=Ctq4Fn(mode,+2,x,xmu)
fx(2)=Ctq4Fn(mode,+1,x,xmu)
fx(-1)=Ctq4Fn(mode,-2,x,xmu)
fx(-2)=Ctq4Fn(mode,-1,x,xmu)
C
elseif (pdlabel .eq. 'cteq5l1') then
C
fx(-5)=Ctq5L(-5,x,xmu)
fx(-4)=Ctq5L(-4,x,xmu)
fx(-3)=Ctq5L(-3,x,xmu)
fx(0)=Ctq5L(0,x,xmu)
fx(+3)=Ctq5L(+3,x,xmu)
fx(+4)=Ctq5L(+4,x,xmu)
fx(+5)=Ctq5L(+5,x,xmu)
fx(1)=Ctq5L(+2,x,xmu)
fx(2)=Ctq5L(+1,x,xmu)
fx(-1)=Ctq5L(-2,x,xmu)
fx(-2)=Ctq5L(-1,x,xmu)
C
elseif ((pdlabel(1:5) .eq. 'cteq5') .or.
. (pdlabel(1:4) .eq. 'ctq5')) then
C
fx(-5)=Ctq5Pdf(-5,x,xmu)
fx(-4)=Ctq5Pdf(-4,x,xmu)
fx(-3)=Ctq5Pdf(-3,x,xmu)
fx(0)=Ctq5Pdf(0,x,xmu)
fx(+3)=Ctq5Pdf(+3,x,xmu)
fx(+4)=Ctq5Pdf(+4,x,xmu)
fx(+5)=Ctq5Pdf(+5,x,xmu)
fx(1)=Ctq5Pdf(+2,x,xmu)
fx(2)=Ctq5Pdf(+1,x,xmu)
fx(-1)=Ctq5Pdf(-2,x,xmu)
fx(-2)=Ctq5Pdf(-1,x,xmu)
C
elseif (pdlabel(1:5) .eq. 'cteq6') then
C
fx(-5)=Ctq6Pdf(-5,x,xmu)
fx(-4)=Ctq6Pdf(-4,x,xmu)
fx(-3)=Ctq6Pdf(-3,x,xmu)
fx(0)=Ctq6Pdf(0,x,xmu)
fx(+3)=Ctq6Pdf(+3,x,xmu)
fx(+4)=Ctq6Pdf(+4,x,xmu)
fx(+5)=Ctq6Pdf(+5,x,xmu)
fx(1)=Ctq6Pdf(+2,x,xmu)
fx(2)=Ctq6Pdf(+1,x,xmu)
fx(-1)=Ctq6Pdf(-2,x,xmu)
fx(-2)=Ctq6Pdf(-1,x,xmu)
endif
c
c a "diffractive" photon
c
q2max=xmu*xmu
if(ih .eq. 3) then !from the electron
fx(7)=epa_electron(x,q2max)
elseif(ih .eq. 2) then !from a proton without breaking
fx(7)=epa_proton(x,q2max)
endif
return
end
|