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event.f
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subroutine limits_update(main,vertex,orig,recon,doing_deuterium,
> doing_pion,doing_kaon,doing_delta,doing_rho,contrib,slop)
implicit none
include 'structures.inc'
include 'radc.inc'
type(event_main):: main
type(event):: vertex, orig, recon
type(contribtype):: contrib
type(sloptype):: slop
integer i
logical doing_deuterium, doing_pion, doing_kaon, doing_delta, doing_rho
! Update the "contribution limits" records
! ... GENERATION values
call update_range(vertex%e%delta, contrib%gen%e%delta)
call update_range(vertex%e%yptar, contrib%gen%e%yptar)
call update_range(vertex%e%xptar, contrib%gen%e%xptar)
call update_range(vertex%p%delta, contrib%gen%p%delta)
call update_range(vertex%p%yptar, contrib%gen%p%yptar)
call update_range(vertex%p%xptar, contrib%gen%p%xptar)
call update_range(main%Trec, contrib%gen%Trec)
! ........ another tricky shift
if (doing_deuterium .or. doing_pion .or. doing_kaon .or. doing_delta .or. doing_rho) then
call update_range(vertex%e%E-main%Ein_shift,contrib%gen%sumEgen)
else
call update_range(vertex%e%E+vertex%p%E-main%Ein_shift,contrib%gen%sumEgen)
endif
! ... TRUE values
! ........ tricky shift here, remember this'll get compared with edge.e.E,
! ........ compensate for main.target.Coulomb to
! ........ copy the shift made to the edge in generate
call update_range(orig%e%E-main%Ee_shift, contrib%tru%e%E)
call update_range(orig%e%xptar, contrib%tru%e%xptar)
call update_range(orig%e%yptar, contrib%tru%e%yptar)
call update_range(orig%e%xptar, contrib%tru%e%xptar)
call update_range(orig%p%E, contrib%tru%p%E)
call update_range(orig%p%yptar, contrib%tru%p%yptar)
call update_range(orig%p%xptar, contrib%tru%p%xptar)
! ........ another tricky shift
call update_range(orig%Em-main%Ein_shift+main%Ee_shift,contrib%tru%Em)
call update_range(orig%Pm, contrib%tru%Pm)
call update_range(orig%Trec, contrib%tru%Trec)
! ... SPECTROMETER values
call update_range(main%SP%e%delta, contrib%SP%e%delta)
call update_range(main%SP%e%yptar, contrib%SP%e%yptar)
call update_range(main%SP%e%xptar, contrib%SP%e%xptar)
call update_range(main%SP%p%delta, contrib%SP%p%delta)
call update_range(main%SP%p%yptar, contrib%SP%p%yptar)
call update_range(main%SP%p%xptar, contrib%SP%p%xptar)
! ... VERTEX values
call update_range(vertex%Trec, contrib%vertex%Trec)
call update_range(vertex%Em, contrib%vertex%Em)
call update_range(vertex%Pm, contrib%vertex%Pm)
! ... RADIATION stuff
! ??? should be looking at Egamma2+3 cause we do use limits on that, indirectly
do i = 1, 3
call update_range(Egamma_used(i), contrib%rad%Egamma(i))
enddo
call update_range(Egamma_used(1)+Egamma_used(2)+Egamma_used(3),
> contrib%rad%Egamma_total)
! Update the "slop limits" records
! ... MC slops
call update_range(main%RECON%e%delta-main%SP%e%delta,slop%MC%e%delta)
call update_range(main%RECON%e%yptar-main%SP%e%yptar,slop%MC%e%yptar)
call update_range(main%RECON%e%xptar-main%SP%e%xptar,slop%MC%e%xptar)
call update_range(main%RECON%p%delta-main%SP%p%delta,slop%MC%p%delta)
call update_range(main%RECON%p%yptar-main%SP%p%yptar,slop%MC%p%yptar)
call update_range(main%RECON%p%xptar-main%SP%p%xptar,slop%MC%p%xptar)
! %.. total slops
! ........ that tricky shift again, slops accounted for by the shift not
! ........ included in slop.total.Em.
call update_range(recon%Em-(orig%Em-main%Ein_shift+main%Ee_shift),
> slop%total%Em)
call update_range(abs(recon%Pm)-abs(orig%Pm), slop%total%Pm)
return
end
!-------------------------------------------------------------------
subroutine update_range(val,range)
include 'structures.inc'
type(rangetype):: range
real*8 val
range%lo = min(range%lo, val)
range%hi = max(range%hi, val)
return
end
!----------------------------------------------------------------------
! THE routine to GENERATE the (max of 7) random quantities we need to get
! a full description of our event.
subroutine generate(main,vertex,orig,success)
implicit none
include 'simulate.inc'
integer i, ii
real*8 Emin, Emax
real*8 ranprob,ranth1,ranth,ranph,t3,t4,t5,t6
real*8 pferlo,pferhi
real*8 m_spec !spectator (A-1) mass based on missing energy
real*8 gauss1
logical success
real*8 grnd !random # generator.
type(event_main):: main
type(event):: vertex, orig
real*8 nsig_max
parameter(nsig_max=3.0e0) !max #/sigma for gaussian ran #s.
! Randomize the position of the interaction inside the available region.
! gen.xwid and gen.ywid are the intrinsic beam widths (one sigma value).
! Use a gaussian beam distribution with +/- 3.0 sigma (add raster afterwards).
C DJG As best I can figger, main.target.y is positive when the beam is high in the lab
C DJG and main.target.x is positive when the beam is right when looking downstream.
C DJG Don't ask me why, but it seems to be this way.
C DJG Note that this means that +fry points down. I will make frx point left.
main%target%x = gauss1(nsig_max)*gen%xwid+targ%xoffset
main%target%y = gauss1(nsig_max)*gen%ywid+targ%yoffset
! fr_pattern=1 - old bedpost raster rectangle - targ.fr1/fr2 are the x/y raster half-widths.
! fr_pattern=2 - circle - targ.fr1/fr2 are the inner and outer radii.
! fr_pattern=3 - new flat raster rectangle - targ.fr1/fr2 are the x/y raster half-widths.
if (targ%fr_pattern .eq. 1) then !old bedpost, square raster
t3=grnd()*pi
t4=grnd()*pi
t5=cos(t3)*targ%fr1
t6=cos(t4)*targ%fr2
elseif (targ%fr_pattern .eq. 2) then !circular raster
t3=grnd()*2.*pi
t4=sqrt(grnd())*(targ%fr2-targ%fr1)+targ%fr1
t5=cos(t3)*t4
t6=sin(t3)*t4
elseif (targ%fr_pattern .eq. 3) then !new, flat square raster
t3=2.*grnd()-1.0
t4=2.*grnd()-1.0
t5=targ%fr1*t3
t6=targ%fr2*t4
else !no raster
t5=0.0
t6=0.0
endif
main%target%x = main%target%x+t5
main%target%y = main%target%y+t6
main%target%z = (0.5-grnd())*targ%length+targ%zoffset
main%target%rastery = t6 !'raster' contribution to vert. pos.
main%target%rasterx = t5 ! points right as you look downstream - need to flip sign later.
! Take fluctuations of the beam energy into account, and remember to correct
! for ionization loss in the target and Coulomb acceleration of incoming
! electron. Remove targ.zoffset from the z position of the scattering
! in order to get the position relative to the center of the target.
call trip_thru_target (1, main%target%z-targ%zoffset, Ebeam, 0.0e0,
> main%target%Eloss(1), main%target%teff(1),Me,1)
if (.not.using_Eloss) main%target%Eloss(1) = 0.0
if (using_Coulomb) then
c main%target%Coulomb=targ%Coulomb_constant*(3.-(grnd())**(2./3.))
C modified 5/15/06 for poinct
main%target%Coulomb=targ%Coulomb_constant
else
main%target%Coulomb=0.0
endif
vertex%Ein = Ebeam + (grnd()-0.5)*dEbeam +
> main%target%Coulomb - main%target%Eloss(1)
! ... deterimine known variation in Ein from Ebeam_vertex_ave and in
! ... Ee due to Coulomb energy to compare limits to generated event by event.
! ... (USED TO SHIFT 'LIMIT' VALUES IN UPDATE_RANGE CALLS. ARE THEY NEEDED???)
main%Ein_shift = vertex%Ein - Ebeam_vertex_ave
main%Ee_shift = main%target%Coulomb - targ%Coulomb%ave
! Initialize success code and fractional weight due to radiation and
! generation tricks
5 success = .false.
main%gen_weight = 1.0
! Generated quantities: (phase_space NOT YET IMPLEMENTED).
!
! phase_space: Generate electron E,yptar,xptar and hadron yptar,xptar??
! doing_hyd_elast: Generate electron angles. Solve for everything else.
! doing_deuterium: Generate electron energy and angles, proton angles.
! Solve for proton momentum, p_fermi.
! doing_eep, A>2: generate electron and hadron energy, angles. Solve for Em,Pm.
! doing_pion: generate electron energy and angles, hadron angles, p_fermi, Em.
! Solve for hadron momentum.
! doing_kaon: as doing_pion.
! doing_delta: as doing_pion.
! doing_rho: as doing_pion.
! doing_semi: Generate electron E,yptar,xptar and hadron E, yptar,xptar
!
! The above is summarized in the following table:
!
! ELECTRON HADRON
! ------------------ ------------------
! E yptar xptar E yptar xptar p_fermi Em
!
!H(e,e'p) X X
!D(e,e'p) X X X X X
!A(e,e'p) X X X X X X
!----------------------------------------------------------------------
!H(e,e'pi) X X X X X
!A(e,e'pi) X X X X X X X
!H(e,e'K) X X X X X
!A(e,e'K) X X X X X X X
!H(e,e'p)pi X X X X X
!A(e,e'p)pi X X X X X X X
!----------------------------------------------------------------------
!phase_space X X X ? X X
!
! So our procedure is the following:
! 1) Always generate electron yptar and xptar
! 2) generate hadron yptar and xptar for all cases except H(e,e'p).
! 3) Generate hadron E for A(e,e'p)
! 4) generate electron E for all but hydrogen elastic.
! 5) generate p_fermi, Em for A(e,e'pi) and A(e,e'K).
!
! After we generate xptar/yptar/energy, we calculate physics angles (theta/phi),
! momenta, unit vectors, etc... here and/or in complete_ev.
!
! Note that there are also jacobians associated with some and/or all of
! the above.
! 1: We generate uniformly in xptar/yptar, not theta/phi. We define the
! phase space volume (genvol contribution) as the product of the xptar/yptar
! range, and have a jacobian for each event taking into account the mapping
! between the solid angle on the unit sphere, and the dxptar/dyptar volume
! (the jacobian is 1/cos**3(dtheta), where dtheta is the angle between the
! event and the central spectrometer vector
! 2: For the D(e,e'p), we take Em as fixed in order to calculate the proton
! energy. There is a jacobian ( |dEp'/dEm| ). It comes from integrating
! over the energy conservation delta function: delta(E_D - E_p - E_n - Em).
! Generate Electron Angles (all cases):
vertex%e%yptar=gen%e%yptar%min+grnd()*(gen%e%yptar%max-gen%e%yptar%min)
vertex%e%xptar=gen%e%xptar%min+grnd()*(gen%e%xptar%max-gen%e%xptar%min)
! Generate Hadron Angles (all but H(e,e'p)):
if (doing_deuterium.or.doing_heavy.or.doing_pion.or.doing_kaon
> .or.doing_delta.or.doing_semi) then
vertex%p%yptar=gen%p%yptar%min+grnd()*
> (gen%p%yptar%max-gen%p%yptar%min)
vertex%p%xptar=gen%p%xptar%min+grnd()*
> (gen%p%xptar%max-gen%p%xptar%min)
endif
! Generate Hadron Momentum (A(e,e'p) or semi-inclusive production).
if (doing_heavy .or. doing_semi) then
Emin = max(gen%p%E%min, gen%sumEgen%min - gen%e%E%max)
Emax = min(gen%p%E%max, gen%sumEgen%max - gen%e%E%min)
if (Emin.gt.Emax) goto 100
main%gen_weight=main%gen_weight*(Emax-Emin)/(gen%p%E%max-gen%p%E%min)
vertex%p%E = Emin + grnd()*(Emax-Emin)
vertex%p%P = sqrt(vertex%p%E**2 - Mh2)
vertex%p%delta = 100.*(vertex%p%P-spec%p%P)/spec%p%P
endif
! Generate Electron Energy (all but hydrogen elastic)
if (doing_deuterium.or.doing_heavy.or.doing_pion.or.doing_kaon
> .or.doing_delta.or.doing_rho.or.doing_semi) then
Emin=gen%e%E%min
Emax=gen%e%E%max
if (doing_deuterium .or. doing_pion .or. doing_kaon .or. doing_delta .or. doing_rho) then
Emin = max(Emin,gen%sumEgen%min)
Emax = min(Emax,gen%sumEgen%max)
else if (doing_heavy) then ! A(e,e'p)
Emin = max(Emin, gen%sumEgen%min - vertex%p%E)
Emax = min(Emax, gen%sumEgen%max - vertex%p%E)
endif
if (Emin.gt.Emax) goto 100
main%gen_weight=main%gen_weight*(Emax-Emin)/(gen%e%E%max-gen%e%E%min)
vertex%e%E = Emin + grnd()*(Emax-Emin)
vertex%e%P = vertex%e%E
vertex%e%delta = 100.*(vertex%e%P-spec%e%P)/spec%e%P
endif !not (doing_hyd_elast)
! Calculate the electron and proton PHYSICS angles from the spectrometer angles.
! Note that the proton angles are not yet know for hydrogen elastic.
! NOTE: this needs to be done again for the exclusive rho stuff (just on the hadron side).
call physics_angles(spec%e%theta,spec%e%phi,
& vertex%e%xptar,vertex%e%yptar,vertex%e%theta,vertex%e%phi)
call physics_angles(spec%p%theta,spec%p%phi,
& vertex%p%xptar,vertex%p%yptar,vertex%p%theta,vertex%p%phi)
! Generate Fermi Momentum and Em for A(e,e'pi) and A(e,e'K).
pfer=0.0
pferx=0.0
pfery=0.0
pferz=0.0
vertex%Em=0.0
efer=targ%Mtar_struck !used for pion/kaon xsec calcs.
if(doing_deutpi.or.doing_hepi.or.doing_deutkaon.or.doing_hekaon.or.
> doing_deutdelta.or.doing_hedelta.or.doing_deutrho.or.doing_herho
> .or.doing_deutsemi)then
ranprob=grnd()
ii=1
do while (ranprob.gt.mprob(ii) .and. ii.lt.nump)
ii=ii+1
enddo
if (ii.eq.1) then
pferlo=0
else
pferlo=(pval(ii-1)+pval(ii))/2
endif
if (ii.eq.nump) then
pferhi=pval(nump)
else
pferhi=(pval(ii)+pval(ii+1))/2
endif
pfer=pferlo+(pferhi-pferlo)*grnd()
ranth1=grnd()*2.-1.0
ranth=acos(ranth1)
ranph=grnd()*2.*pi
pferx=sin(ranth)*cos(ranph)
pfery=sin(ranth)*sin(ranph)
pferz=cos(ranth)
if (doing_deutpi.or.doing_deutkaon.or.doing_deutdelta
> .or.doing_deutrho .or.doing_deutsemi) then !Em = binding energy
vertex%Em = Mp + Mn - targ%M
m_spec = targ%M - targ%Mtar_struck + vertex%Em != Mn(Mp) for pi+(-)
efer = targ%M - sqrt(m_spec**2+pfer**2)
endif
if (doing_hepi .or. doing_hekaon .or. doing_hedelta .or. doing_herho) then
call generate_em(pfer,vertex%Em) !Generate Em
m_spec = targ%M - targ%Mtar_struck + vertex%Em != M^*_{A-1}
efer = targ%M - sqrt(m_spec**2+pfer**2)
endif
endif
! Compute all non-generated quantities
if (debug(5)) write(6,*)'gen: calling comp_ev with false, main, vertex'
if (debug(3)) write(6,*)'gen: calling comp_ev with false, main, vertex'
if (debug(3)) write(6,*)'gen: Ein, E =',vertex%Ein,vertex%e%E
call complete_ev(main,vertex,success)
main%sigcc = 1.0
if (debug(2)) write(6,*)'gen: initial success =',success
if (.not.success) goto 100
! ........ temporary storage of Trec for generated event
main%Trec = vertex%Trec
! Radiate the event, if requested. If we get an event weight of zero (i.e.
! if we CAN'T radiate our event into the acceptance) then success is
! false. generate_rad also set orig kinematics, and cuts on Em/Pm.
! If not using_rad, must do these here.
if (using_rad) then
call generate_rad(main,vertex,orig,success)
if (debug(2)) write(6,*)'gen: after gen_rad, success =',success
else
success = .true.
if (doing_heavy) success =
> (vertex%Em .ge. VERTEXedge%Em%min .and.
> vertex%Em .le. VERTEXedge%Em%max .and.
> vertex%Pm .ge. VERTEXedge%Pm%min .and.
> vertex%Pm .le. VERTEXedge%Pm%max)
if (success) then
c do i = 1, neventfields
c orig.all(i) = vertex.all(i)
c enddo
orig = vertex
endif
endif
C DJG need to decay the rho here before we begin transporting through the
C DJG spectrometer
if(doing_rho) then
call rho_decay(orig,spec%p%P,main%epsilon,success)
endif
100 if (debug(2)) write(6,*)'gen: final success =',success
if (debug(2)) write(6,*)'gen: ending'
return
end
!---------------------------------------------------------------------
subroutine complete_ev(main,vertex,success)
implicit none
include 'simulate.inc'
real*8 a, b, c, r, t, QA, QB, QC, radical
real*8 p_new_x,p_new_y,new_x_x,new_x_y,new_x_z
real*8 targ_new_x,targ_new_y
real*8 new_y_x,new_y_y,new_y_z,dummy
real*8 targx,targy,targz
real*8 px,py,pz,qx,qy,qz
real*8 oop_x,oop_y
real*8 krel,krelx,krely,krelz
real*8 MM
real*8 Ehad2,E_rec
real*8 W2
real*8 grnd !random # generator.
logical success
type(event_main):: main
type(event):: vertex
!-----------------------------------------------------------------------
! Calculate everything left in the /event/ structure, given all necessary
! GENERATION values (some set of xptar,yptar,delta for both arms and p_fermi,
! and p_fermi, depending on the scattering process: see table in generate.f
!
! The SINGLE element of /event/ NOT computed here is sigcc.
!
! Another small anomaly is that main.jacobian IS computed here.
! This is because all the necessary terms have to be
! computed here anyway to calculate /event/ qties.
!
!-----------------------------------------------------------------------
! Initialize
success = .false.
main%jacobian = 1.0
! ... unit vector components of outgoing e,p
! ... z is DOWNSTREAM, x is DOWN and y is LEFT looking downstream.
if (debug(4)) write(6,*)'comp_ev: at 1'
vertex%ue%x = sin(vertex%e%theta)*cos(vertex%e%phi)
vertex%ue%y = sin(vertex%e%theta)*sin(vertex%e%phi)
vertex%ue%z = cos(vertex%e%theta)
if ((.not.doing_hyd_elast).and.(.not.doing_rho)) then
vertex%up%x = sin(vertex%p%theta)*cos(vertex%p%phi)
vertex%up%y = sin(vertex%p%theta)*sin(vertex%p%phi)
vertex%up%z = cos(vertex%p%theta)
endif
if (debug(4)) write(6,*)'comp_ev: at 2'
! First finish off the e side
! Calculate scattered electron energy for hydrogen/deuterium (e,e'p)
if (doing_hyd_elast) then
vertex%e%E = vertex%Ein*Mh/(Mh+vertex%Ein*(1.-vertex%ue%z))
if (vertex%e%E.gt.vertex%Ein) return
vertex%e%P = vertex%e%E
vertex%e%delta = (vertex%e%P - spec%e%P)*100./spec%e%P
if (debug(4)) write(6,*)'comp_ev: at 3'
endif
! The q vector
if (debug(5)) write(6,*)'comp_ev: Ein,E,uez=',vertex%Ein,vertex%e%E,vertex%ue%z
vertex%nu = vertex%Ein - vertex%e%E
vertex%Q2 = 2*vertex%Ein*vertex%e%E*(1.-vertex%ue%z)
vertex%q = sqrt(vertex%Q2 + vertex%nu**2)
vertex%xbj = vertex%Q2/2./Mp/vertex%nu
vertex%uq%x = - vertex%e%P*vertex%ue%x / vertex%q
vertex%uq%y = - vertex%e%P*vertex%ue%y / vertex%q
vertex%uq%z =(vertex%Ein - vertex%e%P*vertex%ue%z)/ vertex%q
if (abs(vertex%uq%x**2+vertex%uq%y**2+vertex%uq%z**2-1).gt.0.01)
> stop 'Error in q vector normalization'
if (debug(4)) write(6,*)'comp_ev: at 5'
! Now complete the p side, along with vertex.Em, vertex.Pm, vertex.Mrec.
! NOTE: Coherent pion/kaon production (bound final state) is treated as
! hydrogen, but with targ.Mtar_struck=targ.M, targ.Mtar_rec=bound final state.
if (doing_hyd_elast) then !p = q
vertex%Em = 0.0
vertex%Pm = 0.0
vertex%Mrec = 0.0
vertex%up%x = vertex%uq%x
vertex%up%y = vertex%uq%y
vertex%up%z = vertex%uq%z
vertex%p%P = vertex%q
vertex%p%theta = acos(vertex%up%z)
if (abs(vertex%up%x/sin(vertex%p%theta)).gt.1)
> write(6,*) 'cos(phi)=',vertex%up%x/sin(vertex%p%theta)
vertex%p%phi = atan2(vertex%up%y,vertex%up%x)
if (vertex%p%phi.lt.0.) vertex%p%phi=vertex%p%phi+2.*pi
call spectrometer_angles(spec%p%theta,spec%p%phi,
& vertex%p%xptar,vertex%p%yptar,vertex%p%theta,vertex%p%phi)
vertex%p%E = sqrt(vertex%p%P**2+Mh2)
vertex%p%delta = (vertex%p%P - spec%p%P)*100./spec%p%P
if (debug(4)) write(6,*)'comp_ev: at 6'
elseif (doing_deuterium) then !need Ep, and a jacobian.
vertex%Em = targ%Mtar_struck + targ%Mrec - targ%M !=2.2249 MeV
vertex%Mrec = targ%M - targ%Mtar_struck + vertex%Em !=targ.Mrec
a = -1.*vertex%q*(vertex%uq%x*vertex%up%x+vertex%uq%y*vertex%up%y+vertex%uq%z*vertex%up%z)
b = vertex%q**2
c = vertex%nu + targ%M
t = c**2 - b + Mh2 - vertex%Mrec**2
QA = 4.*(a**2 - c**2)
QB = 4.*c*t
QC = -4.*a**2*Mh2 - t**2
radical = QB**2 - 4.*QA*QC
if (radical.lt.0) return
vertex%p%E = (-QB - sqrt(radical))/2./QA
! Check for two solutions
! if ( (-QB + sqrt(radical))/2./QA .gt. Mh ) then
! write(6,*) 'There are two valid solutions for the hadron momentum'
! write(6,*) 'We always pick one, so this may be a problem, and needs to be checked'
! write(6,*) 'solns=',(-QB - sqrt(radical))/2./QA,(-QB + sqrt(radical))/2./QA
! endif
! Check for two solutions, but only print warning if both are within
! event generation limits.
Ehad2 = (-QB + sqrt(radical))/2./QA
if (Ehad2.gt.edge%p%E%min .and. Ehad2.lt.edge%p%E%max .and. ntried.le.5000) then
write(6,*) 'The low-momentum solution to E_hadron is within the spectrometer generation'
write(6,*) 'limits. If it is in the acceptance, Its the end of the world as we know it!!!'
write(6,*) 'E_hadron solns=',vertex%p%E,Ehad2
endif
if (vertex%p%E.le.Mh) return
vertex%p%P = sqrt(vertex%p%E**2 - Mh2)
vertex%p%delta = (vertex%p%P - spec%p%P)*100./spec%p%P
! ........ the Jacobian here is |dEp'/dEm|
main%jacobian = (t*(c-vertex%p%E) + 2*c*vertex%p%E*(vertex%p%E-c)) /
> (2*(a**2-c**2)*vertex%p%E + c*t)
main%jacobian = abs(main%jacobian)
elseif (doing_pion .or. doing_kaon .or. doing_delta) then
c if (doing_rho) then
c Mh = Mrho
! DJG give the rho mass some width (non-relativistic Breit-Wigner)
c Mh = Mh + 0.5*150.2*tan((2.*grnd()-1.)*atan(2.*500./150.2))
c Mh2 = Mh*Mh
c ntup.rhomass=Mh
c write(6,*) 'rho mass is', Mh
c endif
vertex%Pm = pfer !vertex%Em generated at beginning.
vertex%Mrec = targ%M - targ%Mtar_struck + vertex%Em
a = -1.*vertex%q*(vertex%uq%x*vertex%up%x+vertex%uq%y*vertex%up%y+vertex%uq%z*vertex%up%z)
b = vertex%q**2
c = vertex%nu + targ%M
! For nuclei, correct for fermi motion and missing energy. Also, check
! second solution to quadratic equation - there are often two valid
! solutions, and we always pick the larger one (which is the forward going
! one in the center of mass) and HOPE that the smaller one is never in the
! acceptance. If the low momentum solution IS within the acceptance, we
! have big problems.
if (doing_deutpi.or.doing_hepi.or.doing_deutkaon.or.doing_hekaon.or.
> doing_deutdelta.or.doing_hedelta) then
a = a - abs(pfer)*(pferx*vertex%up%x+pfery*vertex%up%y+pferz*vertex%up%z)
b = b + pfer**2 + 2*vertex%q*abs(pfer)*
> (pferx*vertex%uq%x+pfery*vertex%uq%y+pferz*vertex%uq%z)
*** c = c - sqrt(vertex.Mrec**2+pfer**2)
c = vertex%nu + efer !same as above, but this way if we redefine
!'efer', it's the same everywhere.
endif
t = c**2 - b + Mh2 - targ%Mrec_struck**2
QA = 4.*(a**2 - c**2)
QB = 4.*c*t
QC = -4.*a**2*Mh2 - t**2
! write(6,*) ' '
! write(6,*) ' '
! write(6,*) 'E0=',vertex.Ein
! write(6,*) 'P_elec,P_prot=',vertex.e.P/1000.,vertex.p.P/1000.
! write(6,*) 'thetae,phie=',vertex.e.theta*180./pi,vertex.e.phi*180./pi
! write(6,*) 'thetap,phip=',vertex.p.theta*180./pi,vertex.p.phi*180./pi
! write(6,*) 'q,nu,costhetapq=',vertex.q,vertex.nu,(vertex.uq.x*vertex.up.x+vertex.uq.y*vertex.up.y+vertex.uq.z*vertex.up.z)
! write(6,*) 'a,b,c=',a/1000.,b/1000000.,c/1000.
! write(6,*) 't=',t/1000000.
! write(6,*) 'A,B,C=',QA/1.d6,QB/1.d9,QC/1.d12
! write(6,*) 'rad=',QB**2 - 4.*QA*QC
! write(6,*) 'e1,e2=',(-QB-sqrt(radical))/2000./QA,(-QB+sqrt(radical))/2000./QA
! write(6,*) 'E_pi1,2=',vertex.nu+targ.M-(-QB-sqrt(radical))/2./QA,
! > vertex.nu+targ.M-(-QB+sqrt(radical))/2./QA
radical = QB**2 - 4.*QA*QC
if (radical.lt.0) return
vertex%p%E = (-QB - sqrt(radical))/2./QA
Ehad2 = (-QB + sqrt(radical))/2./QA
if (doing_delta) then !choose one of the two solutions.
! write(6,*) ' e1, e2=',vertex%p%E,Ehad2
if (grnd().gt.0.5) vertex%p%E = Ehad2
else !verify that 'backwards' soln. is no good.
if (Ehad2.gt.edge%p%E%min .and. Ehad2.lt.edge%p%E%max .and. ntried.le.5000) then
write(6,*) 'The low-momentum solution to E_hadron is within the spectrometer generation'
write(6,*) 'limits. If it is in the acceptance, Its the end of the world as we know it!!!'
write(6,*) 'E_hadron solns=',vertex%p%E,Ehad2
endif
endif
E_rec=c-vertex%p%E !energy of recoil system
if (E_rec.le.targ%Mrec_struck) return !non-physical solution
if (vertex%p%E.le.Mh) return
vertex%p%P = sqrt(vertex%p%E**2 - Mh2)
vertex%p%delta = (vertex%p%P - spec%p%P)*100./spec%p%P
! write(6,*) 'p,e=',vertex%p%P,vertex%p%E
elseif (doing_rho) then
call generate_rho(vertex,success) !generate rho in 4pi in CM
if(.not.success) then
return
else ! we have a success, but set back to false for rest of complete_ev
success=.false.
endif
elseif (doing_phsp) then
vertex%p%P = spec%p%P !????? single arm phsp??
vertex%p%E= sqrt(Mh2+vertex%p%P**2)
vertex%p%delta = (vertex%p%P - spec%p%P)*100./spec%p%P
if (debug(4)) write(6,*)'comp_ev: at 7.5',Mh2,vertex%p%E
endif
if (debug(4)) write(6,*)'comp_ev: at 7'
! Compute some pion and kaon stuff. Some of these should be OK for proton too.
if (doing_pion .or. doing_kaon .or. doing_delta .or. doing_rho .or. doing_semi) then
W2 = targ%Mtar_struck**2 + 2.*targ%Mtar_struck*vertex%nu - vertex%Q2
main%W = sqrt(abs(W2)) * W2/abs(W2)
main%epsilon=1./(1. + 2.*(1+vertex%nu**2/vertex%Q2)*tan(vertex%e%theta/2.)**2)
main%theta_pq=acos(vertex%up%x*vertex%uq%x+vertex%up%y*vertex%uq%y+vertex%up%z*vertex%uq%z)
main%t = vertex%Q2 - Mh2 + 2*vertex%nu*vertex%p%E -
> 2*vertex%p%P*vertex%q*cos(main%theta_pq)
main%tmin = vertex%Q2 - Mh2 + 2*vertex%p%E*vertex%nu -
> 2*vertex%p%P*vertex%q
main%q2 = vertex%Q2
! CALCULATE ANGLE PHI BETWEEN SCATTERING PLANE AND REACTION PLANE.
! Therefore, define a new system with the z axis parallel to q, and
! the x axis inside the q-z-plane: z' = q, y' = q X z, x' = y' X q
! this gives phi the way it is usually defined, i.e. phi=0 for in-plane
! particles closer to the downstream beamline than q.
! phi=90 is above the horizontal plane when q points to the right, and
! below the horizontal plane when q points to the left.
! Also take into account the different definitions of x, y and z in
! replay and SIMC:
! As seen looking downstream: replay SIMC (old_simc)
! x right down (left)
! y down left (up)
! z all have z pointing downstream
!
! SO: x_replay=-y_simc, y_replay=x_simc, z_replay= z_simc
qx = -vertex%uq%y !convert to 'replay' coord. system
qy = vertex%uq%x
qz = vertex%uq%z
px = -vertex%up%y
py = vertex%up%x
pz = vertex%up%z
dummy=sqrt((qx**2+qy**2)*(qx**2+qy**2+qz**2))
new_x_x = -qx*qz/dummy
new_x_y = -qy*qz/dummy
new_x_z = (qx**2 + qy**2)/dummy
dummy = sqrt(qx**2 + qy**2)
new_y_x = qy/dummy
new_y_y = -qx/dummy
new_y_z = 0.0
p_new_x = px*new_x_x + py*new_x_y + pz*new_x_z
p_new_y = px*new_y_x + py*new_y_y + pz*new_y_z
main%phi_pq = atan2(p_new_y,p_new_x) !atan2(y,x)=atan(y/x)
if (main%phi_pq.lt.0.e0) main%phi_pq=main%phi_pq+2.*pi
! if (p_new_y.lt.0.) then
! main.phi_pq = 2*pi - main.phi_pq
! endif
! if ((p_new_x**2+p_new_y**2).eq.0.) then
! main.phi_pq = 0.0
! else
! main.phi_pq = acos(p_new_x/sqrt(p_new_x**2+p_new_y**2))
! endif
! if (p_new_y.lt.0.) then
! main.phi_pq = 2*pi - main.phi_pq
! endif
if (debug(2)) then
write(6,*)'comp_ev: nu =',vertex%nu
write(6,*)'comp_ev: Q2 =',vertex%Q2
write(6,*)'comp_ev: theta_e =',vertex%e%theta
write(6,*)'comp_ev: epsilon =',main%epsilon
write(6,*)'comp_ev: theta_pq =',main%theta_pq
write(6,*)'comp_ev: phi_pq =',main%phi_pq
write(6,*)'comp_ev: E_hadron =',vertex%p%E
endif
if(using_tgt_field) then !calculate some azimuthal angles that only make
!sense for polarized target
! CALCULATE ANGLE PHI BETWEEN SCATTERING PLANE AND TARGET POLARIZATION.
! As seen looking downstream: replay SIMC (old_simc)
! x right down (left)
! y down left (up)
! z all have z pointing downstream
!
! SO: x_replay=-y_simc, y_replay=x_simc, z_replay= z_simc
qx = -vertex%uq%y !convert to 'replay' coord. system
qy = vertex%uq%x
qz = vertex%uq%z
c Target in-plane, so targy=0
targx = -targ_pol*sin(abs(targ_Bangle)) ! replay coordinates
targy = 0.0
targz = targ_pol*cos(abs(targ_Bangle))
c Target out of plane, so targx=0
c targx = 0.0 ! replay coordinates
c targy = -targ_pol*sin(abs(targ_Bangle))
c targz = targ_pol*cos(abs(targ_Bangle))
dummy=sqrt((qx**2+qy**2)*(qx**2+qy**2+qz**2))
new_x_x = -qx*qz/dummy
new_x_y = -qy*qz/dummy
new_x_z = (qx**2 + qy**2)/dummy
dummy = sqrt(qx**2 + qy**2)
new_y_x = qy/dummy
new_y_y = -qx/dummy
new_y_z = 0.0
p_new_x = targx*new_x_x + targy*new_x_y + targz*new_x_z
p_new_y = targx*new_y_x + targy*new_y_y + targz*new_y_z
main%phi_targ = atan2(p_new_y,p_new_x) !atan2(y,x)=atan(y/x)
if(main%phi_targ.lt.0.) main%phi_targ = 2.*pi+main%phi_targ
! CALCULATE ANGLE BETA BETWEEN REACTION PLANE AND TRANSVERSE TARGET
! POLARIZATION.
! As seen looking downstream: replay SIMC (old_simc)
! x right down (left)
! y down left (up)
! z all have z pointing downstream
!
! SO: x_replay=-y_simc, y_replay=x_simc, z_replay= z_simc
qx = -vertex%uq%y !convert to 'replay' coord% system
qy = vertex%uq%x
qz = vertex%uq%z
C Taret in plane
targx = -targ_pol*sin(abs(targ_Bangle)) ! 'replay' coordinates
targy = 0.0
targz = targ_pol*cos(abs(targ_Bangle))
C Target out of plane
c targx = 0.0 ! 'replay' coordinates
c targy = -targ_pol*sin(abs(targ_Bangle))
c targz = targ_pol*cos(abs(targ_Bangle))
px = -vertex%up%y
py = vertex%up%x
pz = vertex%up%z
dummy = sqrt((qy*pz-qz*py)**2 + (qz*px-qx*pz)**2 + (qx*py-qy*px)**2)
new_y_x = (qy*pz-qz*py)/dummy
new_y_y = (qz*px-qx*pz)/dummy
new_y_z = (qx*py-qy*px)/dummy
dummy = sqrt((new_y_y*qz-new_y_z*qy)**2 + (new_y_z*qx-new_y_x*qz)**2
> + (new_y_x*qy-new_y_y*qx)**2)
new_x_x = (new_y_y*qz - new_y_z*qy)/dummy
new_x_y = (new_y_z*qx - new_y_x*qz)/dummy
new_x_z = (new_y_x*qy - new_y_y*qx)/dummy
targ_new_x = targx*new_x_x + targy*new_x_y + targz*new_x_z
targ_new_y = targx*new_y_x + targy*new_y_y + targz*new_y_z
main%beta = atan2(targ_new_y,targ_new_x)
if(main%beta .lt. 0.) main%beta = 2*pi+main%beta
CDJG Calculate the "Collins" (phi_pq+phi_targ) and "Sivers"(phi_pq-phi_targ) angles
vertex%phi_s = main%phi_pq-main%phi_targ
if(vertex%phi_s .lt. 0.) vertex%phi_s = 2*pi+vertex%phi_s
vertex%phi_c = main%phi_pq+main%phi_targ
if(vertex%phi_c .gt. 2.*pi) vertex%phi_c = vertex%phi_c-2*pi
if(vertex%phi_c .lt. 0.0) vertex%phi_c = 2*pi+vertex%phi_c
dummy = sqrt((qx**2+qy**2+qz**2))*sqrt((targx**2+targy**2+targz**2))
main%theta_tarq = acos((qx*targx+qy*targy+qz*targz)/dummy)
endif !polarized-target specific azimuthal angles
endif !end of pion/kaon specific stuff.
if (debug(4)) write(6,*)'comp_ev: at 8'
! Compute the Pm vector in in SIMC LAB system, with x down, and y to the left.
! Computer Parallel, Perpendicular, and Out of Plane componenants.
! Parallel is component along q_hat. Out/plane is component along
! (e_hat) x (q_hat) (oop_x,oop_y are components of out/plane unit vector)
! Perp. component is what's left: along (q_hat) x (oop_hat).
! So looking along q, out of plane is down, perp. is left.
vertex%Pmx = vertex%p%P*vertex%up%x - vertex%q*vertex%uq%x
vertex%Pmy = vertex%p%P*vertex%up%y - vertex%q*vertex%uq%y
vertex%Pmz = vertex%p%P*vertex%up%z - vertex%q*vertex%uq%z
vertex%Pmiss = sqrt(vertex%Pmx**2+vertex%Pmy**2+vertex%Pmz**2)
vertex%Emiss = vertex%nu + targ%M - vertex%p%E
!STILL NEED SIGN FOR PmPer!!!!!!
oop_x = -vertex%uq%y ! oop_x = q_y *(z_hat x y_hat) = q_y *-(x_hat)
oop_y = vertex%uq%x ! oop_y = q_x *(z_hat x x_hat) = q_x * (y_hat)
vertex%PmPar = (vertex%Pmx*vertex%uq%x + vertex%Pmy*vertex%uq%y + vertex%Pmz*vertex%uq%z)
vertex%PmOop = (vertex%Pmx*oop_x + vertex%Pmy*oop_y) / sqrt(oop_x**2+oop_y**2)
vertex%PmPer = sqrt( max(0.e0, vertex%Pm**2 - vertex%PmPar**2 - vertex%PmOop**2 ) )
if (debug(4)) write(6,*)'comp_ev: at 9',vertex%Pmx,vertex%Pmy,vertex%Pmz
! Calculate Em, Pm, Mrec, Trec for all cases not already done.
! For doing_heavy, get Mrec from nu+M=Ep+Erec, and Erec**2=Mrec**2+Pm**2
! For (e,e'pi/K), could go back and determine momentum of recoil struck
! particle, and get Mrec and Trec seperately for struck nucleon(hyperon)
! and A-1 system. For now, just take Trec for the A-1 system, and ignore
! the recoiling struck nucleon (hyperon), so Trec=0 for hydrogen target.
if (doing_hyd_elast) then
vertex%Trec = 0.0
else if (doing_deuterium) then
vertex%Pm = vertex%Pmiss
vertex%Trec = sqrt(vertex%Mrec**2 + vertex%Pm**2) - vertex%Mrec
else if (doing_heavy) then
vertex%Pm = vertex%Pmiss
vertex%Mrec = sqrt(vertex%Emiss**2-vertex%Pmiss**2)
vertex%Em = targ%Mtar_struck + vertex%Mrec - targ%M
vertex%Trec = sqrt(vertex%Mrec**2 + vertex%Pm**2) - vertex%Mrec
else if (doing_hydpi .or. doing_hydkaon .or. doing_hyddelta .or. doing_hydrho) then
vertex%Trec = 0.0
else if (doing_deutpi.or.doing_hepi.or.doing_deutkaon.or.doing_hekaon
> .or.doing_deutdelta.or.doing_hedelta.or.doing_deutrho.or.doing_herho) then
vertex%Trec = sqrt(vertex%Mrec**2 + vertex%Pm**2) - vertex%Mrec
else if (doing_semi) then
vertex%Pm = vertex%Pmiss
vertex%Em = vertex%Emiss
endif
if (debug(5)) write(6,*) 'vertex%Pm,vertex%Trec,vertex%Em',vertex%Pm,vertex%Trec,vertex%Em
if (debug(4)) write(6,*)'comp_ev: at 10'
! calculate krel for deuteron/heavy pion(kaon). Deuteron is straightforward.
! A>2 case is some approximation for 3He (DJG).
if (doing_deutpi .or. doing_deutkaon .or. doing_deutdelta .or. doing_deutrho) then
if ((vertex%Emiss**2-vertex%Pmiss**2).lt.0) write(6,*) 'BAD MM!!!!! Emiss,Pmiss=',vertex%Emiss, vertex%Pmiss
MM = sqrt(max(0.e0,vertex%Emiss**2-vertex%Pmiss**2))
krel = sqrt( max(0.e0,MM**2-4.*targ%Mrec_struck**2) )
else if (doing_hepi .or. doing_hekaon .or. doing_hedelta .or. doing_herho) then
if ((vertex%Emiss**2-vertex%Pmiss**2).lt.0) write(6,*) 'BAD MM!!!!! Emiss,Pmiss=',vertex%Emiss, vertex%Pmiss
MM = sqrt(max(0.e0,vertex%Emiss**2-vertex%Pmiss**2))
krelx = vertex%Pmx + 1.5*pferx*pfer
krely = vertex%Pmy + 1.5*pfery*pfer
krelz = vertex%Pmz + 1.5*pferz*pfer
krel = sqrt(krelx**2+krely**2+krelz**2)
if(vertex%Em.lt.6.0) krel = -krel !bound state test???
endif
ntup%krel = krel
if(doing_semi) then
CDJG if ((vertex%Emiss**2-vertex%Pmiss**2).lt.0) then
CDJG I should be testing that the missing mass is above two pion
CDJG threshold! Otherwise, it's just exclusive
c if ((vertex%Emiss**2-vertex%Pmiss**2).lt.(Mp+Mpi0)**2) then
if (((targ%Mtar_struck+vertex%nu-vertex%p%E)**2-vertex%Pmiss**2).lt.(Mp+Mpi0)**2) then
success=.false.
return
endif
endif
if(doing_semi) then
vertex%zhad = vertex%p%E/vertex%nu
vertex%pt2 = vertex%p%P**2*(1.0-cos(main%theta_pq)**2)
if(vertex%zhad.gt.1.0) then
success=.false.
return
endif
endif
! Determine PHYSICS scattering angles theta/phi for the two spectrometer
! vectors, and the Jacobian which we must include in our xsec computation
! to take into account the fact that we're not generating in the physics
! solid angle d(omega) but in 'spectrometer angles' yptar,xptar.
! NOTE: the conversion from spectrometer to physics angles was done when
! the angles were first generated (except for the proton angle for hydrogen
! elastic, where it was done earlier in complete_ev).
!
! call physics_angles(spec.e.theta,spec.e.phi,
! & vertex.e.xptar,vertex.e.yptar,vertex.e.theta,vertex.e.phi)
! call physics_angles(spec.p.theta,spec.p.phi,
! & vertex.p.xptar,vertex.p.yptar,vertex.p.theta,vertex.p.phi)
r = sqrt(1.+vertex%e%yptar**2+vertex%e%xptar**2) !r=cos(theta-theta0)
main%jacobian = main%jacobian / r**3 !1/cos**3(theta-theta0)
C DJG Since we generate rho's in 4pi (in spherical angles) we don't need no
C DJG stinkin' Jacobian!
if (doing_heavy .or. doing_pion .or. doing_kaon .or.
> doing_delta .or. doing_semi) then
r = sqrt(1.+vertex%p%yptar**2+vertex%p%xptar**2)
main%jacobian = main%jacobian / r**3 !1/cos**3(theta-theta0)
endif
if (debug(4)) write(6,*)'comp_ev: at 11'
! The effective target thickness that the scattered particles see, and the
! resulting energy losses
call trip_thru_target (2, main%target%z-targ%zoffset, vertex%e%E,
> vertex%e%theta, main%target%Eloss(2), main%target%teff(2),Me,1)
call trip_thru_target (3, main%target%z-targ%zoffset, vertex%p%E,
> vertex%p%theta, main%target%Eloss(3), main%target%teff(3),Mh,1)
if (.not.using_Eloss) then
main%target%Eloss(2) = 0.0
main%target%Eloss(3) = 0.0
endif
if (debug(4)) write(6,*)'comp_ev: at 12'
! Initialize parameters necessary for radiative corrections
call radc_init_ev(main,vertex)
! Success code
success = .true.
if(debug(2)) write(6,*)'comp_ev: at end...'
return
end
!---------------------------------------------------------------------
subroutine complete_recon_ev(recon,success)
implicit none
include 'simulate.inc'
real*8 p_new_x,p_new_y,new_x_x,new_x_y,new_x_z
real*8 new_y_x,new_y_y,new_y_z,dummy