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fdvcs.f_save
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fdvcs.f_save
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*CMZ : 13/07/2004 17.06.26 by H1 Saclay
*-- Author : Unknown 17/12/2003
* ---------------------------------
real function fdvcs*8(x)
* ---------------------------------
IMPLICIT REAL*8(A-H,O-Z)
include 'dvcs.common'
include 'forpaw.common'
double precision mp
PARAMETER (MXDIM = 50 )
DIMENSION X(MXDIM)
dimension res(100)
common /setting/ nset
common /counter1/ icountxq,icountt
C ------------------------------------------------------
common/dvcs_BOUNDS/xmin,xmax,qmin,qmax,tmin,tmax,
> phimin,phimax,pphimin,pphimax,thmin,thmax
logical Angle_Integ
common/dvcs_IN/spin,Z,A,s,tchar,xlaml,xlamp,
> Angle_Integ,iord,icount,nx,nq,IPRO
common/dvcs_OUT/res
common/dvcs_VAR/x_main,q_main,phi_main,t_main,ym_main
C ------------------------------------------------------
real elepi,EGAMR,sweight,srad,elepin,ehadi
common /RADGEN/ elepi,EGAMR,sweight,srad,elepin,ehadi
logical stFIXED_save
common /FIXED/ stFIXED_save
integer i_outrange
common/out_of_range/i_outrange
integer igen_exp
common /genexp/ igen_exp
logical first
data first /.true./
real shat,ytest,mel
real wmin_test
real smphibel
REAL sig_smphibel
fdvcs = 0.d0
icountxq = 1
icountt = 1
* X(1) -> x
* X(2) -> q
* X(3) -> t
* X(4) -> Egamma (ISR)
* X(5) -> phi
* X(6) -> pphi
* X(7) -> theta
cls>>
cls>> generate in linx,linq,lint
cls>>
if (igen_exp.eq.1) then
xx = dexp(X(1))
else
xx = X(1)
endif
if (igen_exp.eq.1) then
q = dexp(X(2))
else
q = X(2)
endif
t = X(3)
x_main = xx
q_main = q
t_main = t
if (Angle_Integ) then
phi =0.
pphi =0.
theta =0.
nset = 2
else
phi = X(5)
pphi = X(6)
theta = X(7)
endif
if (srad.eq.0.) then
egamr = 0.
else
egamr = sngl(X(4))
endif
phi_main = phi
xpi = datan(1.d0) * 4.0d0
C
C --- IN CASE OF RADGEN
C
C ---------------------------------------------
elepi = elepin
sweight = 1.
snew = s
if (srad.eq.1.) then
13 continue
elepi = elepin
call QED_ISR(sngl(s),elepi,EGAMR,sweight)
if (elepi.lt.5.) goto 13
cc write(6,*) 'x4 eg we ',X(4),egamr,sweight
mp = 0.93827d0
elep = dble(elepi)
eproton = dble(ehadi)
if (stFIXED_save) then
snew = 2.0d0 * elep * mp + mp**2
else
snew = 4.0d0 * elep * eproton
endif
endif
weight = dble(sweight)
C ---------------------------------------------
i_outrange = 0
CLS>> NEW
ym_main = 0.93827d0
C ----- For dissociated proton :
IF (stIELAS.eq.0) THEN
call PXMASS (ym_main,ENHA)
ENDIF
mp = 0.93827d0
if (stIELAS.eq.1) then
t_min = -mp**2*x_main**2/(1.d0-x_main)
else
cep t_min = x_main*(ym_main**2-mp**2)/(1.d0-x_main)
t_min = -ym_main**2 * x_main/(1.d0-x_main) + mp**2 * x_main
endif
if (t_main.gt.t_min) i_outrange = 1
if (t_main.gt.t_min) then
ccc write(6,*) 'out of tmin',t_min,t_main
endif
if (t_main.gt.t_min) goto 999
xntp = sngl(x_main)
qntp = sngl(q_main)
phintp = sngl(phi_main)
tntp = sngl(t_main)
shat = sngl(snew)
ytest = qntp/(xntp*(shat - sngl(mp)**2))
wmin_test = 0.2*sqrt(qntp/xntp)
ccc print *,ym_main,wmin_test
cls if (sngl(ym_main).gt.wmin_test) then
cls i_outrange = 1
cls goto 999
cls endif
if ((ytest.gt.1.).or.(ytest.lt.0.)) then
i_outrange = 1
goto 999
endif
CLS>>
if (stFIXED_save) then
call calc_kinem2_fixed(ibad,ioutkin,isca)
else
call calc_kinem2(ibad,ioutkin,isca)
endif
cc print *,ioutkin
if (ioutkin.eq.1) goto 999
CLS>>
mel = 0.000511
if (qntp.lt.((mel**2*ytest**2)/(1.-ytest))) then
i_outrange = 1
goto 999
endif
ccc i_outrange = 0
c---------------------------------
ismear_phibel = 1
c---------------------------------
c if (stFIXED_save) then
c
c phi_p_bel = atan2(ppobel(2),ppobel(1))
c phi_l_bel = atan2(plobel(2),plobel(1))
c phi_g_bel = atan2(prgbel(2),prgbel(1))
c phi_li_bel = atan2(plibel(2),plibel(1))
c dphi_bel=atan2(ppobel(2),ppobel(1))-
c + atan2(plobel(2),plobel(1))
c phi_newcalc = dphi_bel
c phibel=sngl(phi_newcalc)
c
c else
c
c phi_l_lab = atan2(plolab(2),plolab(1))
c phi_g_lab = atan2(prglab(2),prglab(1))
c sm4 = 0.
c sm6 = 0.
c call smear(real(sm4),real(3.e-3))
c call smear(real(sm6),real(3.e-3))
c phi_l_lab=phi_l_lab*(1+dble(sm4))
c phi_g_lab=phi_g_lab*(1+dble(sm6))
c
c if (phi_l_lab.gt.xpi) phi_l_lab=phi_l_lab-2.*xpi
c if (phi_l_lab.lt.-xpi) phi_l_lab=phi_l_lab+2.*xpi
c if (phi_g_lab.gt.xpi) phi_g_lab=phi_g_lab-2.*xpi
c if (phi_g_lab.lt.-xpi) phi_g_lab=phi_g_lab+2.*xpi
c
c coplanarity = dabs(phi_l_lab-phi_g_lab)
c
c phi_newcalc_0 = dble(calcphirb(1.,0))
c phi_newcalc = dble(calcphirb(1.,1))
c
c cls smear phibel
c ccc if (dabs(phi_newcalc).gt.3.15) print *,'WARNING'
c smphibel = 0.
c sig_smphibel = 0.35
c if (ismear_phibel.eq.1) call smear(smphibel,sig_smphibel)
c phi_newcalc = phi_newcalc + dble(smphibel)
c
c if (phi_newcalc.gt.xpi) phi_newcalc=phi_newcalc-2.*xpi
c if (phi_newcalc.lt.-xpi) phi_newcalc=phi_newcalc+2.*xpi
c if (phi_newcalc_0.gt.xpi) phi_newcalc_0=phi_newcalc_0-2.*xpi
c if (phi_newcalc_0.lt.-xpi) phi_newcalc_0=phi_newcalc_0+2.*xpi
c
c phibel_0=sngl(phi_newcalc_0)
c phibel=sngl(phi_newcalc)
c
c resoltest = 100*(phibel_0-phibel)/phibel_0
c
c resol = real(resoltest)
c phibelrec=real(phibel)
c phibelgen=real(phibel_0)
c
c c------------------------------
c c if ((coplanarity.gt.(xpi*0.95)).and.
c c + (coplanarity.lt.(xpi*1.05))) then
c
c c if (dabs(resoltest).lt.400.) then
c c
c c write(97,*) resoltest
c c
c c endif
c c
c c write(88,*) resoltest,phibel_0,phibel,coplanarity
c c if ((resoltest.lt.110.).and.(resoltest.gt.90.))
c c + write(98,*) resoltest,phibel_0,phibel,coplanarity
c c if ((resoltest.lt.10.).and.(resoltest.gt.(-10.)))
c c + write(99,*) resoltest,phibel_0,phibel,coplanarity
c c if ((resoltest.lt.210.).and.(resoltest.gt.190.))
c c + write(89,*) resoltest,phibel_0,phibel,coplanarity
c c
c c if (dabs(phi_newcalc).gt.xpi) print *,' here WARNING',
c c + dabs(phi_newcalc),xpi,dble(smphibel)
c
c c endif
c c------------------------------
c
c endif
c phi_l_lab = atan2(plolab(2),plolab(1))
c phi_g_lab = atan2(prglab(2),prglab(1))
c sm4 = 0.
c sm6 = 0.
c call smear(real(sm4),real(3.e-3))
c call smear(real(sm6),real(3.e-3))
c phi_l_lab=phi_l_lab*(1+dble(sm4))
c phi_g_lab=phi_g_lab*(1+dble(sm6))
c
c if (phi_l_lab.gt.xpi) phi_l_lab=phi_l_lab-2.*xpi
c if (phi_l_lab.lt.-xpi) phi_l_lab=phi_l_lab+2.*xpi
c if (phi_g_lab.gt.xpi) phi_g_lab=phi_g_lab-2.*xpi
c if (phi_g_lab.lt.-xpi) phi_g_lab=phi_g_lab+2.*xpi
c
c coplanarity = dabs(phi_l_lab-phi_g_lab)
ccc print *,'step1',prglab(1),plolab(1)
phi_newcalc_0 = dble(calcphirb(1.,0))
phi_newcalc = dble(calcphirb(1.,1))
ccc print *,phi_newcalc_0
c smphibel = 0.
c sig_smphibel = 0.35
c if (ismear_phibel.eq.1) call smear(smphibel,sig_smphibel)
c phi_newcalc = phi_newcalc + dble(smphibel)
c
c if (phi_newcalc.gt.xpi) phi_newcalc=phi_newcalc-2.*xpi
c if (phi_newcalc.lt.-xpi) phi_newcalc=phi_newcalc+2.*xpi
c if (phi_newcalc_0.gt.xpi) phi_newcalc_0=phi_newcalc_0-2.*xpi
c if (phi_newcalc_0.lt.-xpi) phi_newcalc_0=phi_newcalc_0+2.*xpi
phibel_0=sngl(phi_newcalc_0)
phibel=sngl(phi_newcalc)
resoltest = 100*(phibel_0-phibel)/phibel_0
resol = real(resoltest)
phibelrec=real(phibel)
phibelgen=real(phibel_0)
ccc print *,phi_newcalc
call dvcsob(spin,Z,A,nx,nq,icount,xx,q,snew,t,phi,pphi,
> theta,tchar,xlaml,xlamp,iord,res,phi_newcalc)
icount = 2
if (i_outrange.eq.1) goto 999
if (ipro.eq.1) resu = res(4) ! BH
if (ipro.eq.2) resu = res(2) ! DVCS
if (ipro.eq.3) resu = res(3) ! INT
if (ipro.eq.4) resu = res(4)+res(2)+2.*res(3)
ccc if (ipro.eq.4) resu = res(7) ! CA without TW3
if (ipro.eq.5) resu = res(11) ! SSA without TW3
ccc print *,resu
if (resu.lt.0.d0) then
write(6,*) 'warning FDVCS<0'
i_outrange = 1
endif
if (i_outrange.eq.1) goto 999
if (igen_exp.eq.1) then
resu = resu * xx
resu = resu * q
endif
fdvcs = resu
fdvcs = fdvcs*weight
ccc write(6,*) X(1),X(2),X(3),fdvcs
c --- Fill histograms :
CALL XHFILL(1,XX,fdvcs)
CALL XHFILL(2,q,fdvcs)
CALL XHFILL(3,t,fdvcs)
CALL XHFILL(4,dble(egamr),fdvcs)
999 continue
cc write(6,*) x_main,q_main,t_main,fdvcs
return
end