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decnst.f
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*CMZ : 29/05/2004 19.17.17 by H1 Saclay
*CMZ : 1.06/00 16/06/95 11.14.57 by Benno List
*CMZ : 1.03/00 13/02/95 15.13.20 by Benno List
*CMZ : 1.02/00 03/11/94 10.00.50 by Benno List
*CMZ : 1.01/01 21/10/94 16.21.23 by Benno List
*CMZ : 1.01/00 01/09/94 17.56.16 by Benno List
*-- Author : Benno List 01/09/94
************************************************************************
SUBROUTINE DECNST (INSTAR, IDEC, IDECN)
include 'dvcs.common'
include 'cprod.common'
INTEGER INSTAR, IDEC
************************************************************************
*
* Purpose: Let a N* decay
* -------- Possible decay modes (also charge conjugates)
* N*+ -> p pi0, n pi+
* N*+ -> Delta++ pi-, Delta+ pi0, Delta0 pi+
* N*+ -> p (pi+ pi-)_I=0, p (pi0 pi0)_I=0
* N*+ -> p rho0, n rho+
* N*+ -> p eta
* N*+ -> Lambda K+
* N*0 -> p pi-, n pi0
* N*0 -> Delta+ pi-, Delta0 pi0, Delta- pi+
* N*0 -> n (pi+ pi-)_I=0, n (pi0 pi0)_I=0
* N*0 -> p rho-, n rho0
* N*0 -> n eta
* N*0 -> Lambda K0S, Lambda K0L
* Branching ratios between lines taken from
* Rev. Part. Prop. 1994: Phys. Rev. D50, Pt. I, 1173.
* Branching ratios between particles in one line
* calculated from CLEBSCH-GORDAN coefficients
* N* can be:
* name PDG code name PDG code
* N(1440)+ 12212 N(1440)0 12112
* N(1520)+ 2124 N(1520)0 1214
* N(1535)+ 22212 N(1535)0 22112
* N(1650)+ 32212 N(1650)0 32112
* N(1675)+ 2216 N(1675)0 2116
* N(1680)+ 12216 N(1680)0 12116
* N(1700)+ 22124 N(1700)0 21214
* N(1710)+ 42212 N(1710)0 42112
* N(1720)+ 32124 N(1720)0 31214
*
* Input: INSTAR: Number of N* in /CPROD/
* ------ from common block /CPROD/:
* NPART, PPCMS8, ITYPE
*
* Output: IDEC: Number of first decay particle in /CPROD/
* ------- IDECN: Number of stable decay nucleon in /CPROD/
* to common block /CPROD/:
* NPART, PPCMS8, ITYPE, ISTAT, MOHEP, IDAHEP
*
* Called by: GENEVT
* ----------
*
* Author: Benno List, 1.9.94
* -------
*
* Changed by:
* -----------
*
* Calling: From CERN Library:
* -------- U102 LORENB8 LORENTZ boost back to lab system (REAL*8)
*
* From H1UTIL:
* PMASS
* H1RN Random number generator
*
* RAMBO RAndom Momenta BOoster (phase space gen.)
* DECPI0 pi0 decay
* DECRHO rho decay
* DECDEL Delta decay
* DECETA eta decay
*
************************************************************************
PARAMETER(NMAX = 4000)
COMMON /LUJETS/ NLUJETS,KLU(4000,5),PLU(4000,5),VLU(4000,5)
integer benno_code
PARAMETER (NCODES = 9)
PARAMETER (NDECAY = 6)
* Legal N*+ codes
INTEGER NPLCOD (1:NCODES)
+ /12212, 2124, 22212, 32212, 2216, 12216, 22124,
+ 42212, 32124/
* Legal N*0 codes
INTEGER N0COD (1:NCODES)
+ /12112, 1214, 22112, 32112, 2116, 12116, 21214,
+ 42112, 31214/
* Cummulative branching ratios for the channels
* N* -> N pi, Delta pi, N rho, N (pi pi)_I=0, N eta, Lambda K
* for the different mass states
REAL DECCHN (1:NDECAY-1, 1:NCODES)
+ /0.67, 0.92, 0.92, 1.00, 1.00,
+ 0.60, 0.80, 1.00, 1.00, 1.00,
+ 0.50, 0.50, 0.50, 0.50, 1.00,
+ 0.75, 0.80, 0.90, 0.90, 0.90,
+ 0.45, 1.00, 1.00, 1.00, 1.00,
+ 0.67, 0.78, 0.89, 1.00, 1.00,
+ 0.10, 0.45, 0.65, 1.00, 1.00,
+ 0.15, 0.40, 0.55, 0.85, 0.85,
+ 0.15, 0.15, 0.90, 0.90, 0.90/
* Cummulative branching ratios for different particle charges
REAL CGCOEF (1:2, 1:NDECAY)
+ /0.33, 1.00,
+ 0.50, 0.83,
+ 0.33, 1.00,
+ 0.67, 1.00,
+ 1.00, 1.00,
+ 1.00, 1.00/
* Decay particles for N*+ decays
INTEGER NPLDC1 (1:3, 1:NDECAY), NPLDC2 (1:3, 1:NDECAY),
+ NPLDC3 (1:3, 1:NDECAY)
DATA ((NPLDC1(I,J), NPLDC2(I,J), NPLDC3(I,J), I=1, 3), J=1,NDECAY)
* N* -> N pi
+ /2212, 111, 0,
+ 2112, 211, 0,
+ 0, 0, 0,
* N* -> Delta pi
+ 2224, -211, 0,
+ 2214, 111, 0,
+ 2114, 211, 0,
* N* -> N rho
+ 2212, 113, 0,
+ 2112, 213, 0,
+ 0, 0, 0,
* N** -> N (pi pi)_I=0
+ 2212, 211, -211,
+ 2212, 111, 111,
+ 0, 0, 0,
* N* -> N eta
+ 2212, 221, 0,
+ 0, 0, 0,
+ 0, 0, 0,
* N* -> Lambda K
+ 3122, 321, 0,
+ 0, 0, 0,
+ 0, 0, 0/
* Decay particles for N*0 decays
INTEGER N0DC1 (1:3, 1:NDECAY), N0DC2 (1:3, 1:NDECAY),
+ N0DC3 (1:3, 1:NDECAY)
DATA ((N0DC1(I,J), N0DC2(I,J), N0DC3(I,J), I=1, 3), J=1, NDECAY)
* N* -> N pi
+ /2112, 111, 0,
+ 2212, -211, 0,
+ 0, 0, 0,
* N* -> Delta pi
+ 1114, 211, 0,
+ 2114, 111, 0,
+ 2214, -211, 0,
* N* -> N rho
+ 2112, 113, 0,
+ 2212, -213, 0,
+ 0, 0, 0,
* N** -> N (pi pi)_I=0
+ 2112, 211, -211,
+ 2112, 111, 111,
+ 0, 0, 0,
* N* -> N eta
+ 2112, 221, 0,
+ 0, 0, 0,
+ 0, 0, 0,
* N* -> Lambda K
+ 3122, 311, 0,
+ 0, 0, 0,
+ 0, 0, 0/
REAL*8 XM (100), P (4, 100), WT, SUM, WIDTH, XMMIN
REAL*8 PDPCMS (1:4), PDPRS (1:4)
C PRINT *, '--- DECNST ----'
C PRINT *, 'ITYPE (INSTAR) = ', ITYPE (INSTAR)
C CALL PR5V8 ('p_N* ', PPCMS8 (1, INSTAR))
if (stIDEBUG.ge.2) then
write(6,*) ' -- begin of DECNST'
endif
c --- Fill the CPROD common : -----------------------------------------
NPART = 1
if (stIRAD.eq.0) then
iline = 7
else
iline = 9
endif
PPART(1,1) = PLU(iline,1)
PPART(2,1) = PLU(iline,2)
PPART(3,1) = PLU(iline,3)
PPART(4,1) = PLU(iline,4)
PPART(5,1) = PLU(iline,5)
do i=1,5
PPART8(i,1) = dble(PPART(i,1))
enddo
c --- for the while, in the resonance rest frame
PPCMS8(1,1) = PPART8(1,1)
PPCMS8(2,1) = PPART8(2,1)
PPCMS8(3,1) = PPART8(3,1)
PPCMS8(4,1) = PPART8(4,1)
PPCMS8(5,1) = PPART8(5,1)
cep ITYPE(1) = KLU(iline,2)
ITYPE(1) = benno_code (KLU(iline,2))
MOHEP(1,1) = 0
MOHEP(2,1) = 0
IDAHEP(1,1) = 0
IDAHEP(2,1) = 0
ISTAT(1) = 1
do i=1,NPARTMAX
hasdecayed(i) = 0
enddo
c -----------------------------------------------------------------------
IF (ISTAT (INSTAR) .NE. 1) THEN
PRINT *, 'DECNST error: ISTAT (', INSTAR, ') = ', ISTAT (INSTAR)
CALL ERRLOG (200, 'W: DECNST: Particle not undecayed!')
IDEC = 0
IDECN = 0
RETURN
END IF
*
* Look up particle code
*
NNSTAR = 0
NCHARG = 0
DO 1, I = 1, NCODES
IF (ABS (ITYPE (INSTAR)) .EQ. NPLCOD (I)) THEN
NNSTAR = I
NCHARG = 1
ELSE IF (ABS (ITYPE (INSTAR)) .EQ. N0COD (I)) THEN
NNSTAR = I
NCHARG = 0
END IF
1 CONTINUE
if (stIDEBUG.ge.2) then
write(6,*) 'NNSTAR = ', NNSTAR, ', NCHARG = ', NCHARG
endif
IF (NNSTAR .EQ. 0) THEN
PRINT *, '*** DECNST error: Don''t know particle ',
+ ITYPE (INSTAR)
CALL ERRLOG (201, 'S: DECNST: Wrong particle!')
IDEC = 0
IDECN = 0
RETURN
END IF
*
* Choose decay channel
*
7 CONTINUE
R = H1RN ()
NDEC1 = 1
2 CONTINUE
IF (NDEC1 .EQ. NDECAY .OR. DECCHN (NDEC1, NNSTAR) .GE. R) GOTO 3
NDEC1 = NDEC1 + 1
GO TO 2
3 CONTINUE
C IF (NDEC1 .LT. NDECAY) THEN
C PRINT *, 'R = ', R, ', DECCHN (', NDEC1, ', ', NNSTAR, ') = ',
C + DECCHN (NDEC1, NNSTAR)
C ELSE
C PRINT *, 'R = ', R, ', DECCHN (', NDEC1-1, ', ', NNSTAR, ') = ',
C + DECCHN (NDEC1-1, NNSTAR)
C END IF
R = H1RN ()
NDEC2 = 1
4 CONTINUE
IF (NDEC2 .EQ. 3 .OR. CGCOEF (NDEC2, NDEC1) .GE. R) GO TO 5
NDEC2 = NDEC2 + 1
GO TO 4
5 CONTINUE
IF (NDEC2 .LT. 3) THEN
C PRINT *, 'R = ', R, ', CGCOEF (', NDEC2, ', ', NDEC1, ') = ',
C + CGCOEF (NDEC2, NDEC1)
ELSE
C PRINT *, 'R = ', R, ', CGCOEF (', NDEC2-1, ', ', NDEC1, ') = ',
C + CGCOEF (NDEC2-1, NDEC1)
END IF
*
* Fill the mass array XM
*
IDEC = NPART + 1
IDECN = NPART + 1
IF (NCHARG .EQ. 1) THEN
ITYPE (IDEC) = NPLDC1 (NDEC2, NDEC1)
ITYPE (IDEC+1) = NPLDC2 (NDEC2, NDEC1)
ITYPE (IDEC+2) = NPLDC3 (NDEC2, NDEC1)
ELSE
ITYPE (IDEC) = N0DC1 (NDEC2, NDEC1)
ITYPE (IDEC+1) = N0DC2 (NDEC2, NDEC1)
ITYPE (IDEC+2) = N0DC3 (NDEC2, NDEC1)
END IF
IF (ITYPE (INSTAR) .LT. 0) THEN
ITYPE (IDEC) = -ITYPE (IDEC)
IF (ITYPE (IDEC+1) .NE. 111 .AND. ITYPE (IDEC+1) .NE. 221) THEN
ITYPE (IDEC+2) = -ITYPE (IDEC+2)
ITYPE (IDEC+3) = -ITYPE (IDEC+3)
END IF
END IF
c Decay to K0: 50% K0S, 50% K0L
IF (ABS (ITYPE (IDEC+1)) .EQ. 311) THEN
IF (H1RN () .LT. 0.50) THEN
ITYPE (IDEC+1) = 130
ELSE
ITYPE (IDEC+1) = 310
END IF
END IF
IF (ITYPE (IDEC+2) .EQ. 0) THEN
N = 2
if (stIDEBUG.ge.2) write(6,*) ' Decay to ', ITYPE (IDEC), ITYPE (IDEC+1)
ELSE
N = 3
if (stIDEBUG.ge.2) write(6,*) ' Decay to ',
+ ITYPE(IDEC), ITYPE(IDEC+1), ITYPE(IDEC+2)
END IF
ITER = 0
9 CONTINUE
ITER = ITER + 1
SUM = 0D0
DO 10, I = 1, N
IPART = ITYPE (NPART+I)
WIDTH = DBLE (PWIDTH (IPART))
XM (I) = DBLE (PMASS (IPART))
XMMIN = XM (I) - 2D0*WIDTH
IF (ABS (IPART) .EQ. 1114 .OR. ABS (IPART) .EQ. 2114 .OR.
+ ABS (IPART) .EQ. 2214 .OR. ABS (IPART) .EQ. 2224) THEN
XMMIN = 1.1D0
END IF
IF (WIDTH .GT. 1D-6) THEN
XM (I) = RANBW (XM (I), WIDTH, XMMIN, XM (I) + 2D0*WIDTH)
END IF
SUM = SUM + XM (I)
10 CONTINUE
c IF (SUM .GT. PPCMS8 (5, INSTAR) .AND. ITER .LT. 100) then
c write(6,*) 'pb SUM ITER = ',ITER
c write(6,*) 'SUM, PPCMS8 (5, INSTAR) ',SUM, PPCMS8 (5, INSTAR)
c endif
IF (SUM .GT. PPCMS8 (5, INSTAR) .AND. ITER .LT. 100) GO TO 9
C PRINT *, ' ITER: ', ITER
IF (SUM .GT. PPCMS8 (5, INSTAR)) GO TO 7
*
* Call RAMBO: distribute particles uniformely in phase space
*
CALL RAMBO (N, PPCMS8 (5, INSTAR), XM, P, WT, 1, IOK)
IF (IOK .NE. 0) THEN
CALL ERRLOG (202, 'S: DECNST: RAMBO failed!')
END IF
*
* Update /CPROD/
*
ISTAT (INSTAR) = 2
IDAHEP (1, INSTAR) = NPART + 1
IDAHEP (2, INSTAR) = NPART + N
DO 50, I = 1, N
PDPRS (4) = XM (I)**2
DO 30, J = 1, 3
PDPRS (J) = P (J, I)
PDPRS (4) = PDPRS (4) + PDPRS (J)**2
30 CONTINUE
PDPRS (4) = SQRT (PDPRS (4))
CALL LORENB8 (PPCMS8(5,INSTAR), PPCMS8(1,INSTAR), PDPRS, PDPCMS)
DO 40, J = 1, 4
PPCMS8 (J, NPART+I) = PDPCMS (J)
40 CONTINUE
PPCMS8 (5, NPART+I) = XM (I)
ISTAT (NPART + I) = 1
IDAHEP (1, NPART + I) = 0
IDAHEP (2, NPART + I) = 0
MOHEP (1, NPART + I) = INSTAR
MOHEP (2, NPART + I) = 0
C CALL PR4V8 ('PDPRS ', PDPRS)
C CALL PR4V8 ('PDPCMS', PDPCMS)
C CALL PR5V8 ('PPCMS8', PPCMS8 (1, NPART+I))
50 CONTINUE
NPART = NPART + N
if (stIRFRA.eq.0) then
*
* Perform Delta, pi0, rho, eta decay
*
IF (ABS (ITYPE (IDEC)) .EQ. 1114 .OR.
+ ABS (ITYPE (IDEC)) .EQ. 2114 .OR.
+ ABS (ITYPE (IDEC)) .EQ. 2214 .OR.
+ ABS (ITYPE (IDEC)) .EQ. 2224) THEN
CALL DECDEL (IDEC, IDECN)
hasdecayed(idec) = 1
END IF
IF (ITYPE (IDEC+1) .EQ. 111) THEN
CALL DECPI0 (IDEC+1)
hasdecayed(idec+1)= 1
ELSE IF (ITYPE (IDEC+1) .EQ. 113 .OR.
+ ABS (ITYPE(IDEC+1)) .EQ. 213) THEN
IHELI = INT (3.0*H1RN()) - 1
CALL DECRHO (IDEC+1, IHELI, IDUMMY)
hasdecayed(idec+1)= 1
ELSE IF (ITYPE (IDEC+1) .EQ. 221) THEN
CALL DECETA (IDEC+1)
hasdecayed(idec+1)= 1
END IF
IF (ITYPE (IDEC+2) .EQ. 111) THEN
CALL DECPI0 (IDEC+2)
hasdecayed(idec+2)= 1
END IF
endif
n0 = NLUJETS
do i=2,NPART
NLUJETS = NLUJETS +1
PLU(NLUJETS,1) = sngl(PPCMS8(1,i))
PLU(NLUJETS,2) = sngl(PPCMS8(2,i))
PLU(NLUJETS,3) = sngl(PPCMS8(3,i))
PLU(NLUJETS,4) = sngl(PPCMS8(4,i))
PLU(NLUJETS,5) = sngl(PPCMS8(5,i))
KLU(NLUJETS,2) = ITYPE(i)
KLU(NLUJETS,1) = 1
if (hasdecayed(i).eq.1) KLU(NLUJETS,1) = 11
c KLU(NLUJETS,3) = iline
if (MOHEP (1,i).gt.1) then
KLU(NLUJETS,3) = n0 + MOHEP (1,i) -1
else
KLU(NLUJETS,3) = iline
endif
enddo
if (stIDEBUG.ge.1) call LULIST(1)
RETURN
END