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resmod.f
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resmod.f
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CCC Version 072205 - Author: M.E. Christy CCC
CCC Fit form is empirical. Please do not try to interpret physics CCC
CCC from it. This routine needs the parameter files f1parms.dat CCC
CCC and flparms.dat. Units are ub/Sr/Gev. CCC
SUBROUTINE RESMOD(sf,w2,q2,xval,sig)
IMPLICIT NONE
REAL*8 W,w2,q2,mp,mp2,xb,xth(4),sig,xval(50),mass(7),width(7)
REAL*8 height(7),sig_del,sig_21,sig_22,sig_31,sig_32,rescoef(6,4)
REAL*8 nr_coef(3,4),wdif,wdif2,wr,sig_nr,sig_4,q2temp
REAL*8 mpi,meta,intwidth(6),k,kcm,kcmr(6),ppicm,ppi2cm,petacm
REAL*8 ppicmr(6),ppi2cmr(6),petacmr(6),epicmr(6),epi2cmr(6)
REAL*8 eetacmr(6),epicm,epi2cm,eetacm,br_21_1,br_21_2
REAL*8 sig_res,sig_4L,sigtemp,slope,q2low
INTEGER i,j,l,lmax,num,sf
LOGICAL lowq2
lowq2 = .false.
lmax = 1
q2temp = q2
mp = 0.9382727
mpi = 0.136
meta = 0.547
mp2 = mp*mp
W = sqrt(w2)
wdif = w - (mp + mpi)
wr = wdif/w
if(sf.EQ.1) then
q2low = 0.15
else
q2low = 0.05
endif
if(q2.LT.q2low) then
lowq2 = .true.
lmax = 2
endif
c write(6,*) q2,lmax
do l=1,lmax
if(l.EQ.1.AND.lowq2) then
q2 = q2low
elseif(l.EQ.2.AND.lowq2) then
q2 = q2low + 0.1
endif
xb = q2/(q2+w2-mp2)
xth(1) = (q2 + xval(50))/(w2-mp2-0.136+q2)
CCC Calculate kinematics needed for threshold Relativistic B-W CCC
k = (w2 - mp2)/2./mp
kcm = (w2-mp2)/2./w
epicm = (W2 + mpi**2 -mp2 )/2./w
ppicm = SQRT(MAX(0.0,(epicm**2 - mpi**2)))
epi2cm = (W2 + (2.*mpi)**2 -mp2 )/2./w
ppi2cm = SQRT(MAX(0.0,(epi2cm**2 - (2.*mpi)**2)))
eetacm = (W2 + meta*meta -mp2 )/2./w
petacm = SQRT(MAX(0.0,(eetacm**2 - meta**2)))
num = 0
do i=1,6
num = num + 1
mass(i) = xval(i)
kcmr(i) = (mass(i)**2.-mp2)/2./mass(i)
epicmr(i) = (mass(i)**2 + mpi**2 -mp2 )/2./mass(i)
ppicmr(i) = SQRT(MAX(0.0,(epicmr(i)**2 - mpi**2)))
epi2cmr(i) = (mass(i)**2 + (2.*mpi)**2 -mp2 )/2./mass(i)
ppi2cmr(i) = SQRT(MAX(0.0,(epi2cmr(i)**2 - (2.*mpi)**2)))
eetacmr(i) = (mass(i)**2 + meta*meta -mp2 )/2./mass(i)
petacmr(i) = SQRT(MAX(0.0,(eetacmr(i)**2 - meta**2)))
enddo
do i=1,6
num = num + 1
intwidth(i) = xval(num)
width(i) = intwidth(i)
enddo
c write(6,*) "1: ",num
do i=1,6
do j=1,4
num = num + 1
rescoef(i,j)=xval(num)
enddo
if(sf.EQ.1) then
height(i) = rescoef(i,1)/
& (1.+q2/rescoef(i,2))**(rescoef(i,3)+rescoef(i,4)*q2)
if(i.EQ.1) height(i) = 3.0*
& (1.+rescoef(i,1)*q2/(1.+rescoef(i,2)*q2)/
& (1.+q2/rescoef(i,3))**rescoef(i,4))/(1.+q2/0.71)**2.
if(i.EQ.2) height(i) = 1.4*
& (1.+rescoef(i,1)*q2/(1.+rescoef(i,2)*q2)/
& (1.+q2/rescoef(i,3))**rescoef(i,4))/(1.+q2/0.71)**2.
if(i.EQ.5) height(i) = 0.3*
& (1.+rescoef(i,1)*q2/(1.+rescoef(i,2)*q2)/
& (1.+q2/rescoef(i,3))**rescoef(i,4))/(1.+q2/0.71)**2.
else
c height(i) = rescoef(i,1)*
c & (1.+q2/rescoef(i,2))**(-1.*rescoef(i,3))
height(i) = rescoef(i,1)*q2/(1.+rescoef(i,4)*q2)/
& (1.+q2/rescoef(i,2))**rescoef(i,3) !!! Galster Shape !!!
endif
if(height(i).LT.0) height(i) = 0.
enddo
do i=1,3
do j=1,4
num = num + 1
nr_coef(i,j)=xval(num)
enddo
enddo
if(sf.EQ.2) then !!! Put in Roper !!!
mass(7) = xval(41)
width(7) = xval(42)
height(7) = xval(43)*q2/(1.+xval(44)*q2)/
& (1.+q2/xval(45))**xval(46) !!! Galster Shape !!!
sig_4L = height(7)*width(7)/((W-mass(7))**2.
& + 0.25*width(7)*width(7))
else
mass(7) = xval(47)
width(7) = xval(48)
height(7) = xval(49)/(1.+q2/0.61)**3.
sig_4L = height(7)*width(7)/((W-mass(7))**2.
& + 0.25*width(7)*width(7))
endif
CC Calculate Breit-Wigners for the 3 resonance regions CC
sig_32 = width(5)/((W-mass(5))**2.
& + 0.25*width(5)*width(5))
sig_4 = width(6)/((W-mass(6))**2.
& + 0.25*width(6)*width(6))
if(sf.EQ.1) then
br_21_1 = 0.5
br_21_2 = 0.5
else
br_21_1 = 0.985
br_21_2 = 1.-br_21_1
endif
width(1)=intwidth(1)*ppicm/ppicmr(1)
width(2)=intwidth(2)*(br_21_1*ppicm/ppicmr(2)
& +br_21_2*petacm/petacmr(2))
width(3)=intwidth(3)*(0.5*ppicm/ppicmr(3)+0.5*ppi2cm/ppi2cmr(3))
width(4)=intwidth(4)*
& (0.65*ppicm/ppicmr(4)+0.35*ppi2cm/ppi2cmr(4))
c write(6,*) ppicm,ppicmr(3),petacm,petacmr(3),intwidth(3)
sig_del = ppicm/kcm/((W2 - mass(1)**2.)**2.
& + (mass(1)*width(1))**2.)
sig_21 = (0.5*ppicm+0.5*petacm)/kcm/
& ((W2 - mass(2)**2.)**2. + (mass(2)*width(2))**2.)
sig_22 = (0.5*ppicm+0.5*ppi2cm)/2./kcm/
& ((W2 - mass(3)**2.)**2. + (mass(3)*width(3))**2.)
sig_31 = (0.65*ppicm+0.35*ppi2cm)/2./kcm/
& ((W2 - mass(4)**2.)**2. + (mass(4)*width(4))**2.)
if(sf.EQ.2) then
width(5)=intwidth(5)*
& (xval(47)*petacm/petacmr(5)+(1.-xval(5))*ppi2cm/ppi2cmr(5))
sig_32 = (xval(47)*petacm+(1.-xval(47))*ppi2cm)/2./kcm/
& ((W2 - mass(5)**2.)**2. + (mass(5)*width(5))**2.)
width(6)=intwidth(6)*
& (xval(48)*petacm/petacmr(5)+(1.-xval(48))*ppi2cm/ppi2cmr(5))
sig_4 = (xval(48)*petacm+(1.-xval(48))*ppi2cm)/2./kcm/
& ((W2 - mass(6)**2.)**2. + (mass(6)*width(6))**2.)
endif
sig_del = height(1)*sig_del
sig_21 = height(2)*sig_21
sig_22 = height(3)*sig_22
sig_31 = height(4)*sig_31
sig_32 = height(5)*sig_32
sig_4 = height(6)*sig_4
sig_nr = 0.
if(sf.EQ.1) then
do i=1,2
sig_nr = sig_nr +(nr_coef(i,1)*(wdif)**(float(2*i+1)/2.))
& /(q2+nr_coef(i,2))**
& (nr_coef(i,3)+nr_coef(i,4)*q2+xval(44+i)*q2*q2)
enddo
sig_nr = sig_nr*xb
elseif(sf.EQ.2) then
do i=1,1
sig_nr = sig_nr +nr_coef(i,1)*wdif**(float(i)/2.)*
& (1.-xth(1))**2.*q2/(1.+nr_coef(i,3)*q2)
& /(1.+ q2/nr_coef(i,2))**nr_coef(i,4)/w2
enddo
endif
sig_res = sig_del + sig_21 + sig_22 + sig_31 + sig_32 + sig_4
sig_res = sig_res + sig_4L
c if(sf.EQ.2) then
c sig_nr = sig_nr*q2/(1.+xval(49)*q2)
c endif
sig = sig_res + sig_nr
c sig = sig_res
if(w2.LE.(mp+mpi)**2.OR.sig.LT.0) sig = 0.d0
if(L.EQ.1) sigtemp = sig
enddo
q2 = q2temp
if(lowq2) then
if(sf.EQ.1) then
slope = (sigtemp - sig)/0.1
sig = sigtemp + slope*(q2low-q2)
else
slope = sig/q2low
sig = sig - slope*(q2low-q2)
endif
endif
c if(lowq2) write(6,*) q2, sig,sigtemp,slope
c if(sf.eq.1.AND.q2.GT.5) write(6,1000) sig,sig_res,sig_nr
1000 format(9f12.5)
RETURN
END