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calcphirb.f
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*****************************************************************
real function calcphirb(x,index)
*****************************************************************
implicit real*4(a-h,o-z)
include 'forpaw.common'
integer index
logical stFIXED_save
common /FIXED/ stFIXED_save
ccc print *,'enter calcphi',stFIXED_save
sm1 = 0.
sm2 = 0.
sm3 = 0.
sm4 = 0.
sm5 = 0.
sm6 = 0.
xee_temp = plolab(4)
xeg_temp = prglab(4)
xthe_temp = atan2(sqrt(plolab(1)**2+plolab(2)**2),plolab(3))
xphe_temp = atan2(plolab(2),plolab(1))
xthg_temp = atan2(sqrt(prglab(1)**2+prglab(2)**2),prglab(3))
xphg_temp = atan2(prglab(2),prglab(1))
if (rndm(1).lt.0.5) then
xeg_temp = plolab(4)
xee_temp = prglab(4)
xthg_temp = atan2(sqrt(plolab(1)**2+plolab(2)**2),plolab(3))
xphg_temp = atan2(plolab(2),plolab(1))
xthe_temp = atan2(sqrt(prglab(1)**2+prglab(2)**2),prglab(3))
xphe_temp = atan2(prglab(2),prglab(1))
endif
if (index.ge.1) then
call smear(sm1,0.03)
call smear(sm2,0.03)
call smear(sm3,1.e-3)
call smear(sm4,1.e-3)
call smear(sm5,3.e-3)
call smear(sm6,3.e-3)
endif
c sm1 = 0.
c sm2 = 0.
c sm3 = 0.
c sm4 = 0.
c sm5 = 0.
c sm6 = 0.
xee_temp = xee_temp*(1+sm1)
xeg_temp = xeg_temp*(1+sm2)
xthe_temp = xthe_temp*(1+sm3/xthe_temp)
xthg_temp = xthg_temp*(1+sm4/xthg_temp)
xphe_temp = xphe_temp*(1+sm5/xphe_temp)
xphg_temp = xphg_temp*(1+sm6/xphg_temp)
px_spa = xee_temp*sin(xthe_temp)*cos(xphe_temp)
py_spa = xee_temp*sin(xthe_temp)*sin(xphe_temp)
pz_spa = xee_temp*cos(xthe_temp)
e_spa = xee_temp
px_lar = xeg_temp*sin(xthg_temp)*cos(xphg_temp)
py_lar = xeg_temp*sin(xthg_temp)*sin(xphg_temp)
pz_lar = xeg_temp*cos(xthg_temp)
e_lar = xeg_temp
c px_spa = plolab(1)
c py_spa = plolab(2)
c pz_spa = plolab(3)
c e_spa = plolab(4)
c px_lar = prglab(1)
c py_lar = prglab(2)
c pz_lar = prglab(3)
c e_lar = prglab(4)
empz = e_spa-pz_spa+e_lar-pz_lar
xel = plilab(4)
xep = ppilab(4)
c c call calcphir(index,px_spa,py_spa,pz_spa,e_spa,
c c + px_lar,py_lar,pz_lar,e_lar,
c c + empz,phi_r,phiout,iifail)
c
c if (.not.stFIXED_save) then
c c call calc_phirb(xel,xep,px_spa,py_spa,pz_spa,e_spa,
c c + px_lar,py_lar,pz_lar,e_lar,
c c + empz,phi_r,iifail)
c call calc_phircc(xel,xep,px_spa,py_spa,pz_spa,e_spa,
c + px_lar,py_lar,pz_lar,e_lar,
c + empz,phi_r2,iifail,2)
c ccc print *,phi_r2
c c phi_r2 = phi_r
c else
c c call calc_phir(xel,xep,px_spa,py_spa,pz_spa,e_spa,
c c + px_lar,py_lar,pz_lar,e_lar,
c c + empz,phi_r,iifail,1)
c call calc_phir(xel,xep,px_spa,py_spa,pz_spa,e_spa,
c + px_lar,py_lar,pz_lar,e_lar,
c + empz,phi_r2,iifail,2)
c ccc print *,phi_r,phi_r2
c endif
call calcphirorig(px_spa,py_spa,pz_spa,e_spa,
+ px_lar,py_lar,pz_lar,e_lar,
+ empz,phi_r2,iifail)
calcphirb=phi_r2
return
end
*****************************************************************
subroutine calcphirorig(px_spa,py_spa,pz_spa,e_spa,
+ px_lar,py_lar,pz_lar,e_lar,
+ empz,phi_r,iifail)
*****************************************************************
implicit real(a-h,o-z)
double precision mp,pi,elep,eproton,shat,boostp
integer i,iifail
real vec1(3),vec2(3),xvec1,xvec2,term1,term2,term3
**>> INI
real px_spa,py_spa,pz_spa,e_spa,
+ px_lar,py_lar,pz_lar,e_lar,
+ empz
**>> OUT
real phi_r,asym
real pelep, phad, p4e(4), P(4), Q(4)
double precision dpelep, dphad, dp4e(4), dP(4), dQ(4)
real phisegp, phiggp, phipgp
real phi_po,phi_lo,delta_phi,phi_poprf,phi_loprf
real xntp,qntp,yntp,phintp,tntp,
* -> In Lab frame :
+ plilab(4),plolab(4),ppilab(4),ppolab(4),
+ pvglab(4),prglab(4),
+ pvisr(4),
* -> In p rest frame :
+ pliprf(4),ploprf(4),ppiprf(4),ppoprf(4),
+ pvgprf(4),prgprf(4),
* -> In Belitsky frame :
+ plibel(4),plobel(4),ppibel(4),ppobel(4),
+ pvgbel(4),prgbel(4)
* -> Lab frame :
double precision pli_l(4) ! incoming lepton in lab frame
double precision plo_l(4) ! outcoming lepton in lab frame
double precision pvgam_l(4) ! virtual photon in lab frame
double precision ppi_l(4) ! incoming proton in lab frame
double precision ppo_l(4) ! outcoming proton
double precision prgam_l(4) ! outcoming photon
* -> Proton rest frame :
double precision pli_tmp(4) ! incoming lepton in p-rest frame
double precision plo_tmp(4) ! outcoming lepton in p-rest frame
double precision pvgam_tmp(4) ! virtual photon in p-rest frame
double precision ppi_tmp(4) ! incoming proton in p-rest frame
double precision ppo_tmp(4) ! outcoming proton
double precision prgam_tmp(4) ! outcoming photon
double precision toto_li(4)
double precision toto_lo(4)
double precision toto_vgam(4)
* -> In p-rest frame, with z = - q_1^3
* (cf fig. 1 of Belitsky et al.)
double precision pli_b(4) ! incoming lepton
double precision plo_b(4) ! outcoming lepton
double precision pvgam_b(4) ! virtual photon
double precision ppi_b(4) ! incoming proton
double precision prgam_b(4) ! outcoming (real) photon
double precision ppo_b(4) ! outcoming proton
double precision beta(3),betar(3)
double precision ptmp(4)
double precision rot(3)
logical do_xaxis
common/xaxis/do_xaxis,i_xaxis
mp = 0.93827d0
pi = datan(1.d0) * 4.0d0
empz_calc = empz
cc empz_calc = e_spa-pz_spa+e_lar-pz_lar
elep = dble(empz_calc/2.) ! for tests...
eproton = 920.d0
shat = 4.0d0 * elep * eproton
* -> incoming lepton in lab frame
pli_l(4) = elep
pli_l(3) = -elep
pli_l(1) = 0.d0
pli_l(2) = 0.d0
call v_copy(pli_l,plilab)
* -> incoming proton in lab frame
ppi_l(4) = dsqrt(eproton**2 + mp**2)
ppi_l(3) = eproton
ppi_l(1) = 0.0d0
ppi_l(2) = 0.0d0
call v_copy(ppi_l,ppilab)
c print *,'px_sp_kin,py_sp_kin,pz_sp_kin',
c + px_sp_kin,py_sp_kin,pz_sp_kin
* -> outcoming lepton in lab frame
plo_l(4) = dble(e_spa)
plo_l(1) = dble(px_spa)
plo_l(2) = dble(py_spa)
plo_l(3) = dble(pz_spa)
iifail = 0
call v_copy(plo_l,plolab)
c print *,'plolab(1),plolab(2),',
c + 'plolab(3),plolab(4)',
c + real(plolab(1)),real(plolab(2)),
c + real(plolab(3)),real(plolab(4))
* -> virtual photon in lab frame
do i=1,4
pvgam_l(i) = pli_l(i) - plo_l(i)
enddo
call v_copy(pvgam_l,pvglab)
c print *,'pvglab(1),pvglab(2),',
c + 'pvglab(3),pvglab(4)',
c + real(pvglab(1)),real(pvglab(2)),
c + real(pvglab(3)),real(pvglab(4))
* -> real photon in lab frame
prgam_l(4) = dble(e_lar)
prgam_l(1) = dble(px_lar)
prgam_l(2) = dble(py_lar)
prgam_l(3) = dble(pz_lar)
call v_copy(prgam_l,prglab)
c print *,'prglab(1),prglab(2),',
c + 'prglab(3),prglab(4)',
c + real(prglab(1)),real(prglab(2)),
c + real(prglab(3)),real(prglab(4))
* -> outgoing proton in lab frame
ppo_l(4) = ppi_l(4)+pli_l(4)-prgam_l(4)-plo_l(4)
ppo_l(1) = ppi_l(1)+pli_l(1)-prgam_l(1)-plo_l(1)
ppo_l(2) = ppi_l(2)+pli_l(2)-prgam_l(2)-plo_l(2)
ppo_l(3) = ppi_l(3)+pli_l(3)-prgam_l(3)-plo_l(3)
call v_copy(ppo_l,ppolab)
c print *,'ppolab(1),ppolab(2),',
c + 'ppolab(3),ppolab(4)',
c + real(ppolab(1)),real(ppolab(2)),
c + real(ppolab(3)),real(ppolab(4))
* -> calculate phi angles in lab frame...
phi_p_lab = atan2(ppolab(2),ppolab(1))
phi_l_lab = atan2(plolab(2),plolab(1))
phi_g_lab = atan2(prglab(2),prglab(1))
phi_li_lab = atan2(plilab(2),plilab(1))
* -> calculate phi between po and lo in lab frame...
dphi_lab=atan2(ppolab(2),ppolab(1))-
+ atan2(plolab(2),plolab(1))
* --- Boost to p-rest frame, same system axis ---
boostp = eproton / mp
beta(1) = -ppi_l(1) / ppi_l(4)
beta(2) = -ppi_l(2) / ppi_l(4)
beta(3) = -ppi_l(3) / ppi_l(4)
do i=1,3
betar(i) = -beta(i)
enddo
* -> Boost incoming lepton
do i=1,4
ptmp(i) = pli_l(i)
enddo
call boost(ptmp,beta)
do i=1,4
pli_tmp(i) = ptmp(i)
enddo
call v_copy(pli_tmp,pliprf)
c print *,'pliprf(1),pliprf(2),',
c + 'pliprf(3),pliprf(4)',
c + real(pliprf(1)),real(pliprf(2)),
c + real(pliprf(3)),real(pliprf(4))
* -> Boost outcoming lepton
do i=1,4
ptmp(i) = plo_l(i)
enddo
call boost(ptmp,beta)
do i=1,4
plo_tmp(i) = ptmp(i)
enddo
call v_copy(plo_tmp,ploprf)
c print *,'ploprf(1),ploprf(2),',
c + 'ploprf(3),ploprf(4)',
c + real(ploprf(1)),real(ploprf(2)),
c + real(ploprf(3)),real(ploprf(4))
* -> Boost incoming proton
do i=1,4
ptmp(i) = ppi_l(i)
enddo
call boost(ptmp,beta)
do i=1,4
ppi_tmp(i) = ptmp(i)
enddo
call v_copy(ppi_tmp,ppiprf)
c print *,'ppiprf(1),ppiprf(2),',
c + 'ppiprf(3),ppiprf(4)',
c + real(ppiprf(1)),real(ppiprf(2)),
c + real(ppiprf(3)),real(ppiprf(4))
* -> Boost virtual photon
do i=1,4
ptmp(i) = pvgam_l(i)
enddo
call boost(ptmp,beta)
do i=1,4
pvgam_tmp(i) = ptmp(i)
enddo
call v_copy(pvgam_tmp,pvgprf)
c print *,'pvgprf(1),pvgprf(2),',
c + 'pvgprf(3),pvgprf(4)',
c + real(pvgprf(1)),real(pvgprf(2)),
c + real(pvgprf(3)),real(pvgprf(4))
* -> Boost real gamma
do i=1,4
ptmp(i) = prgam_l(i)
enddo
call boost(ptmp,beta)
do i=1,4
prgam_tmp(i) = ptmp(i)
enddo
call v_copy(prgam_tmp,prgprf)
c print *,'prgprf(1),prgprf(2),',
c + 'prgprf(3),prgprf(4)',
c + real(prgprf(1)),real(prgprf(2)),
c + real(prgprf(3)),real(prgprf(4))
* -> Boost outgoing proton
do i=1,4
ptmp(i) = ppo_l(i)
enddo
call boost(ptmp,beta)
do i=1,4
ppo_tmp(i) = ptmp(i)
enddo
call v_copy(ppo_tmp,ppoprf)
c print *,'ppoprf(1),ppoprf(2),',
c + 'ppoprf(3),ppoprf(4)',
c + real(ppoprf(1)),real(ppoprf(2)),
c + real(ppoprf(3)),real(ppoprf(4))
* -> calculate phi angles in prf frame...
phi_p_prf = atan2(ppoprf(2),ppoprf(1))
phi_l_prf = atan2(ploprf(2),ploprf(1))
phi_g_prf = atan2(prgprf(2),prgprf(1))
phi_li_prf = atan2(pliprf(2),pliprf(1))
* -> calculate phi between po and lo in prf frame...
dphi_prf=atan2(ppoprf(2),ppoprf(1))-
+ atan2(ploprf(2),ploprf(1))
* --- all the rest is needed to go in the belitsky frame...
* --- Rotate the system axis, z = -q_1^3 ---
do i=1,3
rot(i) = -pvgam_tmp(i)
enddo
c print *,'rot(1),rot(2),rot(3)',
c + real(rot(1)),real(rot(2)),real(rot(3))
do_xaxis = .true.
i_xaxis = 1
call rotate(pli_tmp,rot,1,pli_b)
do_xaxis = .false.
call v_copy(pli_b,plibel)
c print *,'plibel(1),plibel(2),',
c + 'plibel(3),plibel(4)',
c + real(plibel(1)),real(plibel(2)),
c + real(plibel(3)),real(plibel(4))
call rotate(plo_tmp,rot,1,plo_b)
call rotate(pvgam_tmp,rot,1,pvgam_b)
call rotate(ppi_tmp,rot,1,ppi_b)
call rotate(ppo_tmp,rot,1,ppo_b)
call rotate(prgam_tmp,rot,1,prgam_b)
call v_copy(plo_b,plobel)
call v_copy(pvgam_b,pvgbel)
call v_copy(ppi_b,ppibel)
call v_copy(ppo_b,ppobel)
call v_copy(prgam_b,prgbel)
c print *,'plobel(1),plobel(2),',
c + 'plobel(3),plobel(4)',
c + real(plobel(1)),real(plobel(2)),
c + real(plobel(3)),real(plobel(4))
c print *,'pvgbel(1),pvgbel(2),',
c + 'pvgbel(3),pvgbel(4)',
c + real(pvgbel(1)),real(pvgbel(2)),
c + real(pvgbel(3)),real(pvgbel(4))
c print *,'ppibel(1),ppibel(2),',
c + 'ppibel(3),ppibel(4)',
c + real(ppibel(1)),real(ppibel(2)),
c + real(ppibel(3)),real(ppibel(4))
c print *,'ppobel(1),ppobel(2),',
c + 'ppobel(3),ppobel(4)',
c + real(ppobel(1)),real(ppobel(2)),
c + real(ppobel(3)),real(ppobel(4))
c print *,'prgbel(1),prgbel(2),',
c + 'prgbel(3),prgbel(4)',
c + real(prgbel(1)),real(prgbel(2)),
c + real(prgbel(3)),real(prgbel(4))
phi_p_bel = atan2(ppobel(2),ppobel(1))
phi_l_bel = atan2(plobel(2),plobel(1))
phi_g_bel = atan2(prgbel(2),prgbel(1))
phi_li_bel = atan2(plibel(2),plibel(1))
dphi_bel=atan2(ppobel(2),ppobel(1))-
+ atan2(plobel(2),plobel(1))
* --- final angle (which should be the correct PHI)
phi_r = phi_p_bel
c write(89,*) phi_p_lab,phi_l_lab,phi_g_lab,phi_li_lab,
c + phi_p_prf,phi_l_prf,phi_g_prf,phi_li_prf,
c + phi_p_bel,phi_l_bel,phi_g_bel,phi_li_bel
5 continue
return
end
*****************************************************************
subroutine calc_phirb(xel,xep,px_spa,py_spa,pz_spa,e_spa,
+ px_lar,py_lar,pz_lar,e_lar,
+ empz,phi_r,iifail)
*****************************************************************
implicit real(a-h,o-z)
double precision mp,pi,elep,eproton,boostp
integer i,iifail,index
real vec1(3),vec2(3),xvec1,xvec2,term1,term2,term3
**>> INI
real px_spa,py_spa,pz_spa,e_spa,
+ px_lar,py_lar,pz_lar,e_lar,
+ empz
**>> OUT
real phi_r,asym
real pelep, phad, p4e(4), P(4), Q(4)
double precision dpelep, dphad, dp4e(4), dP(4), dQ(4)
real phisegp, phiggp, phipgp
real phi_po,phi_lo,delta_phi,phi_poprf,phi_loprf
real xntp,qntp,yntp,phintp,tntp,
* -> In Lab frame :
+ plilab(4),plolab(4),ppilab(4),ppolab(4),
+ pvglab(4),prglab(4),
+ pvisr(4),
* -> In p rest frame :
+ pliprf(4),ploprf(4),ppiprf(4),ppoprf(4),
+ pvgprf(4),prgprf(4),
* -> In Belitsky frame :
+ plibel(4),plobel(4),ppibel(4),ppobel(4),
+ pvgbel(4),prgbel(4)
* -> Lab frame :
double precision pli_l(4) ! incoming lepton in lab frame
double precision plo_l(4) ! outcoming lepton in lab frame
double precision pvgam_l(4) ! virtual photon in lab frame
double precision ppi_l(4) ! incoming proton in lab frame
double precision ppo_l(4) ! outcoming proton
double precision prgam_l(4) ! outcoming photon
* -> Proton rest frame :
double precision pli_tmp(4) ! incoming lepton in p-rest frame
double precision plo_tmp(4) ! outcoming lepton in p-rest frame
double precision pvgam_tmp(4) ! virtual photon in p-rest frame
double precision ppi_tmp(4) ! incoming proton in p-rest frame
double precision ppo_tmp(4) ! outcoming proton
double precision prgam_tmp(4) ! outcoming photon
double precision toto_li(4)
double precision toto_lo(4)
double precision toto_vgam(4)
* -> In p-rest frame, with z = - q_1^3
* (cf fig. 1 of Belitsky et al.)
double precision pli_b(4) ! incoming lepton
double precision plo_b(4) ! outcoming lepton
double precision pvgam_b(4) ! virtual photon
double precision ppi_b(4) ! incoming proton
double precision prgam_b(4) ! outcoming (real) photon
double precision ppo_b(4) ! outcoming proton
double precision beta(3),betar(3)
double precision ptmp(4)
double precision rot(3)
logical do_xaxis
common/xaxis/do_xaxis,i_xaxis
mp = 0.93827d0
pi = datan(1.d0) * 4.0d0
elep = dble(empz/2.)!27.5
ccc print *,empz/2,xel
ccc eproton = mp
eproton = xep ! pz of the proton (incoming)
* -> incoming lepton in lab frame
pli_l(4) = elep
pli_l(3) = -elep
pli_l(1) = 0.d0
pli_l(2) = 0.d0
call v_copy(pli_l,plilab)
* -> incoming proton in lab frame
ppi_l(4) = dsqrt(eproton**2 + mp**2)
ppi_l(3) = eproton
ppi_l(1) = 0.0d0
ppi_l(2) = 0.0d0
call v_copy(ppi_l,ppilab)
c print *,'px_sp_kin,py_sp_kin,pz_sp_kin',
c + px_sp_kin,py_sp_kin,pz_sp_kin
* -> outcoming lepton in lab frame
plo_l(4) = dble(e_spa)
plo_l(1) = dble(px_spa)
plo_l(2) = dble(py_spa)
plo_l(3) = dble(pz_spa)
iifail = 0
call v_copy(plo_l,plolab)
* -> virtual photon in lab frame
do i=1,4
pvgam_l(i) = pli_l(i) - plo_l(i)
enddo
call v_copy(pvgam_l,pvglab)
* -> real photon in lab frame
prgam_l(4) = dble(e_lar)
prgam_l(1) = dble(px_lar)
prgam_l(2) = dble(py_lar)
prgam_l(3) = dble(pz_lar)
call v_copy(prgam_l,prglab)
* -> outgoing proton in lab frame
ppo_l(4) = ppi_l(4)+pli_l(4)-prgam_l(4)-plo_l(4)
ppo_l(1) = ppi_l(1)+pli_l(1)-prgam_l(1)-plo_l(1)
ppo_l(2) = ppi_l(2)+pli_l(2)-prgam_l(2)-plo_l(2)
ppo_l(3) = ppi_l(3)+pli_l(3)-prgam_l(3)-plo_l(3)
call v_copy(ppo_l,ppolab)
* -> calculate phi angles in lab frame...
phi_p_lab = atan2(ppolab(2),ppolab(1))
phi_l_lab = atan2(plolab(2),plolab(1))
phi_g_lab = atan2(prglab(2),prglab(1))
phi_li_lab = atan2(plilab(2),plilab(1))
* -> calculate phi between po and lo in lab frame...
dphi_lab=atan2(ppolab(2),ppolab(1))-
+ atan2(plolab(2),plolab(1))
* --- Boost to p-rest frame, same system axis ---
boostp = eproton / mp
beta(1) = -ppi_l(1) / ppi_l(4)
beta(2) = -ppi_l(2) / ppi_l(4)
beta(3) = -ppi_l(3) / ppi_l(4)
do i=1,3
betar(i) = -beta(i)
enddo
* -> Boost incoming lepton
do i=1,4
ptmp(i) = pli_l(i)
enddo
call boost(ptmp,beta)
do i=1,4
pli_tmp(i) = ptmp(i)
enddo
call v_copy(pli_tmp,pliprf)
c print *,'pliprf(1),pliprf(2),',
c + 'pliprf(3),pliprf(4)',
c + real(pliprf(1)),real(pliprf(2)),
c + real(pliprf(3)),real(pliprf(4))
* -> Boost outcoming lepton
do i=1,4
ptmp(i) = plo_l(i)
enddo
call boost(ptmp,beta)
do i=1,4
plo_tmp(i) = ptmp(i)
enddo
call v_copy(plo_tmp,ploprf)
c print *,'ploprf(1),ploprf(2),',
c + 'ploprf(3),ploprf(4)',
c + real(ploprf(1)),real(ploprf(2)),
c + real(ploprf(3)),real(ploprf(4))
* -> Boost incoming proton
do i=1,4
ptmp(i) = ppi_l(i)
enddo
call boost(ptmp,beta)
do i=1,4
ppi_tmp(i) = ptmp(i)
enddo
call v_copy(ppi_tmp,ppiprf)
c print *,'ppiprf(1),ppiprf(2),',
c + 'ppiprf(3),ppiprf(4)',
c + real(ppiprf(1)),real(ppiprf(2)),
c + real(ppiprf(3)),real(ppiprf(4))
* -> Boost virtual photon
do i=1,4
ptmp(i) = pvgam_l(i)
enddo
call boost(ptmp,beta)
do i=1,4
pvgam_tmp(i) = ptmp(i)
enddo
call v_copy(pvgam_tmp,pvgprf)
c print *,'pvgprf(1),pvgprf(2),',
c + 'pvgprf(3),pvgprf(4)',
c + real(pvgprf(1)),real(pvgprf(2)),
c + real(pvgprf(3)),real(pvgprf(4))
* -> Boost real gamma
do i=1,4
ptmp(i) = prgam_l(i)
enddo
call boost(ptmp,beta)
do i=1,4
prgam_tmp(i) = ptmp(i)
enddo
call v_copy(prgam_tmp,prgprf)
c print *,'prgprf(1),prgprf(2),',
c + 'prgprf(3),prgprf(4)',
c + real(prgprf(1)),real(prgprf(2)),
c + real(prgprf(3)),real(prgprf(4))
* -> Boost outgoing proton
do i=1,4
ptmp(i) = ppo_l(i)
enddo
call boost(ptmp,beta)
do i=1,4
ppo_tmp(i) = ptmp(i)
enddo
call v_copy(ppo_tmp,ppoprf)
c print *,'ppoprf(1),ppoprf(2),',
c + 'ppoprf(3),ppoprf(4)',
c + real(ppoprf(1)),real(ppoprf(2)),
c + real(ppoprf(3)),real(ppoprf(4))
* -> calculate phi angles in prf frame...
phi_p_prf = atan2(ppoprf(2),ppoprf(1))
phi_l_prf = atan2(ploprf(2),ploprf(1))
phi_g_prf = atan2(prgprf(2),prgprf(1))
phi_li_prf = atan2(pliprf(2),pliprf(1))
* -> calculate phi between po and lo in prf frame...
dphi_prf=atan2(ppoprf(2),ppoprf(1))-
+ atan2(ploprf(2),ploprf(1))
* --- all the rest is needed to go in the belitsky frame...
* --- Rotate the system axis, z = -q_1^3 ---
do i=1,3
rot(i) = -pvgam_tmp(i)
enddo
do_xaxis = .true.
i_xaxis = 1
call rotate(pli_tmp,rot,1,pli_b)
do_xaxis = .false.
call v_copy(pli_b,plibel)
call rotate(plo_tmp,rot,1,plo_b)
call rotate(pvgam_tmp,rot,1,pvgam_b)
call rotate(ppi_tmp,rot,1,ppi_b)
ccc call v_copy8(ppi_b,ppi_tmp)
call rotate(ppo_tmp,rot,1,ppo_b)
call rotate(prgam_tmp,rot,1,prgam_b)
call v_copy(plo_b,plobel)
call v_copy(pvgam_b,pvgbel)
call v_copy(ppi_b,ppibel)
call v_copy(ppo_b,ppobel)
call v_copy(prgam_b,prgbel)
c print *,pvglab(3),pvgprf(3)
c print *,prgprf(1),prgprf(2),prgbel(1),prgbel(2)
c print *,pvgprf(3)/sqrt(pvgprf(3)**2+pvgprf(1)**2+pvgprf(2)**2)
ccc print *,pvgprf(1),pvgprf(2)
phi_p_bel = atan2(ppobel(2),ppobel(1))
phi_l_bel = atan2(plobel(2),plobel(1))
phi_g_bel = atan2(prgbel(2),prgbel(1))
phi_li_bel = atan2(plibel(2),plibel(1))
phi_v_bel = atan2(pvgbel(2),pvgbel(1))
* --- final angle (which should be the correct PHI)
phi_r = -phi_g_bel
5 continue
return
end
*****************************************************************
subroutine calc_phir(xel,xep,px_spa,py_spa,pz_spa,e_spa,
+ px_lar,py_lar,pz_lar,e_lar,
+ empz,phi_r,iifail,index)
*****************************************************************
implicit real(a-h,o-z)
double precision mp,pi,elep,eproton,boostp
integer i,iifail,index
real vec1(3),vec2(3),xvec1,xvec2,term1,term2,term3
**>> INI
real px_spa,py_spa,pz_spa,e_spa,
+ px_lar,py_lar,pz_lar,e_lar,
+ empz
**>> OUT
real phi_r,asym
real pelep, phad, p4e(4), P(4), Q(4)
double precision dpelep, dphad, dp4e(4), dP(4), dQ(4)
real phisegp, phiggp, phipgp
real phi_po,phi_lo,delta_phi,phi_poprf,phi_loprf
real xntp,qntp,yntp,phintp,tntp,
* -> In Lab frame :
+ plilab(4),plolab(4),ppilab(4),ppolab(4),
+ pvglab(4),prglab(4),
+ pvisr(4),
* -> In p rest frame :
+ pliprf(4),ploprf(4),ppiprf(4),ppoprf(4),
+ pvgprf(4),prgprf(4),
* -> In Belitsky frame :
+ plibel(4),plobel(4),ppibel(4),ppobel(4),
+ pvgbel(4),prgbel(4)
* -> Lab frame :
double precision pli_l(4) ! incoming lepton in lab frame
double precision plo_l(4) ! outcoming lepton in lab frame
double precision pvgam_l(4) ! virtual photon in lab frame
double precision ppi_l(4) ! incoming proton in lab frame
double precision ppo_l(4) ! outcoming proton
double precision prgam_l(4) ! outcoming photon
* -> Proton rest frame :
double precision pli_tmp(4) ! incoming lepton in p-rest frame
double precision plo_tmp(4) ! outcoming lepton in p-rest frame
double precision pvgam_tmp(4) ! virtual photon in p-rest frame
double precision ppi_tmp(4) ! incoming proton in p-rest frame
double precision ppo_tmp(4) ! outcoming proton
double precision prgam_tmp(4) ! outcoming photon
double precision toto_li(4)
double precision toto_lo(4)
double precision toto_vgam(4)
* -> In p-rest frame, with z = - q_1^3
* (cf fig. 1 of Belitsky et al.)
double precision pli_b(4) ! incoming lepton
double precision plo_b(4) ! outcoming lepton
double precision pvgam_b(4) ! virtual photon
double precision ppi_b(4) ! incoming proton
double precision prgam_b(4) ! outcoming (real) photon
double precision ppo_b(4) ! outcoming proton
double precision beta(3),betar(3)
double precision ptmp(4)
double precision rot(3)
logical do_xaxis
common/xaxis/do_xaxis,i_xaxis
mp = 0.93827d0
pi = datan(1.d0) * 4.0d0
elep = xel
ccc print *,empz/2,xel
eproton = mp
ccc print *,xel
* -> incoming lepton in lab frame
pli_l(4) = elep
pli_l(3) = -elep
pli_l(1) = 0.d0
pli_l(2) = 0.d0
call v_copy(pli_l,plilab)
* -> incoming proton in lab frame
ppi_l(4) = dsqrt(eproton**2 + mp**2)
ppi_l(3) = eproton
ppi_l(1) = 0.0d0
ppi_l(2) = 0.0d0
call v_copy(ppi_l,ppilab)
c print *,'px_sp_kin,py_sp_kin,pz_sp_kin',
c + px_sp_kin,py_sp_kin,pz_sp_kin
* -> outcoming lepton in lab frame
plo_l(4) = dble(e_spa)
plo_l(1) = dble(px_spa)
plo_l(2) = dble(py_spa)
plo_l(3) = dble(pz_spa)
iifail = 0
call v_copy(plo_l,plolab)
* -> virtual photon in lab frame
do i=1,4
pvgam_l(i) = pli_l(i) - plo_l(i)
enddo
call v_copy(pvgam_l,pvglab)
* -> real photon in lab frame
prgam_l(4) = dble(e_lar)
prgam_l(1) = dble(px_lar)
prgam_l(2) = dble(py_lar)
prgam_l(3) = dble(pz_lar)
call v_copy(prgam_l,prglab)
c------------------------------------------------------
if (index==2) then
call calcangles(plilab,plolab,pvglab,prglab,phiout)
phi_r = phiout
goto 5
endif
c------------------------------------------------------
* -> outgoing proton in lab frame
ppo_l(4) = ppi_l(4)+pli_l(4)-prgam_l(4)-plo_l(4)
ppo_l(1) = ppi_l(1)+pli_l(1)-prgam_l(1)-plo_l(1)
ppo_l(2) = ppi_l(2)+pli_l(2)-prgam_l(2)-plo_l(2)
ppo_l(3) = ppi_l(3)+pli_l(3)-prgam_l(3)-plo_l(3)
call v_copy(ppo_l,ppolab)
* -> calculate phi angles in lab frame...
phi_p_lab = atan2(ppolab(2),ppolab(1))
phi_l_lab = atan2(plolab(2),plolab(1))
phi_g_lab = atan2(prglab(2),prglab(1))
phi_li_lab = atan2(plilab(2),plilab(1))
* -> calculate phi between po and lo in lab frame...
dphi_lab=atan2(ppolab(2),ppolab(1))-
+ atan2(plolab(2),plolab(1))
* --- Boost to p-rest frame, same system axis ---
c boostp = eproton / mp
c beta(1) = -ppi_l(1) / ppi_l(4)
c beta(2) = -ppi_l(2) / ppi_l(4)
c beta(3) = -ppi_l(3) / ppi_l(4)
c
c do i=1,3
c betar(i) = -beta(i)
c enddo
* -> Boost incoming lepton
do i=1,4
ptmp(i) = pli_l(i)