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fragpj.f
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fragpj.f
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*CMZ : 30/05/2004 08.45.31 by H1 Saclay
*CMZ : 1.06/03 04/04/96 12.06.39 by Benno List
*CMZ : 1.06/02 04/04/96 12.00.41 by Benno List
*CMZ : 1.06/00 16/06/95 10.53.07 by Benno List
*CMZ : 1.01/00 01/09/94 15.34.08 by Benno List
*CMZ : 1.00/02 25/07/94 18.50.37 by Benno List
*CMZ : 0.23/01 04/02/94 17.02.53 by Benno List
*CMZ : 0.23/00 02/02/94 13.14.59 by Benno List
*CMZ : 0.22/00 25/01/94 13.30.59 by Benno List
*CMZ : 0.21/00 19/01/94 11.31.41 by Benno List
*-- Author : Benno List 17/01/94
************************************************************************
SUBROUTINE FRAGPJ
include 'dvcs.common'
INTEGER IBP, IDIFP, ISCN
************************************************************************
*
* Purpose: Take hadronic mass at p vertex and let it decay
* -------- via JETSET
*
* Input: IBP: Number of beam proton in /CPROD/
* ------ IDIFP: Number of diffractive state in /CPROD/
* from common block /CGDIF/:
* IBEAMP
* from common block /CPROD/:
* NPART, PPCMS8
* from common block /CMASS/:
* DMP, DMPI0
*
* Output: ISCN: Number of scattered nucleon /CPROD/
* ------- to common block /CPROD/:
* NPART, PPCMS8, ITYPE, MOHEP, IDAHEP, ISTAT
*
* Called by: GENEVT
* ----------
*
* Author: Benno List, 17.1.94
* -------
*
* Changed by:
* -----------
*
* Calling: From JETSET 7.3:
* -------- LU1ENT, LUGIVE, LUJOIN, LULIST, LUEXEC, PLU, KLU
*
************************************************************************
COMMON /LUDAT2/ KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
COMMON /LUJETS/ NLUJETS,KLU(4000,5),PLU(4000,5),VLU(4000,5)
COMMON /LUDAT1/ MSTU(200), PARU(200), MSTJ(200), PARJ(200)
REAL*8 DPI
PARAMETER (DPI = 3.14159265359D0)
PARAMETER (PI = 3.14159265359E0)
PARAMETER (RADDEG = 180E0/PI)
logical SPLIT_POM
include 'cprod.common'
REAL*8 PQQ (5), PQ (5), PPOM (5)
CHARACTER*100 C100
INTEGER IARR12 (2) /1, 2/
DATA NERR /0/
C PRINT *, '--- FRAGPJ ---'
C PRINT *, 'IBP = ', IBP
C PRINT *, 'IDIFP = ', IDIFP
C PRINT *, 'NPART = ', NPART
DMP = 0.93827d0
DMPI0 = DBLE (PMAS (111,1))
c --- Fill the CPROD common : -----------------------------------------
NPART = 2
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 lab 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)
ITYPE(1) = KLU(iline,2)
MOHEP(1,1) = 0
MOHEP(2,1) = 0
IDAHEP(1,1) = 0
IDAHEP(2,1) = 0
ISTAT(1) = 1
jline = 1
PPART(1,2) = PLU(jline,1)
PPART(2,2) = PLU(jline,2)
PPART(3,2) = PLU(jline,3)
PPART(4,2) = PLU(jline,4)
PPART(5,2) = PLU(jline,5)
do i=1,5
PPART8(i,2) = dble(PPART(i,2))
enddo
c --- for the while, in the lab frame
PPCMS8(1,2) = PPART8(1,2)
PPCMS8(2,2) = PPART8(2,2)
PPCMS8(3,2) = PPART8(3,2)
PPCMS8(4,2) = PPART8(4,2)
PPCMS8(5,2) = PPART8(5,2)
ITYPE(2) = KLU(jline,2)
MOHEP(1,2) = 0
MOHEP(2,2) = 0
IDAHEP(1,2) = 0
IDAHEP(2,2) = 0
ISTAT(2) = 1
do i=1,NPARTMAX
hasdecayed(i) = 0
enddo
IDIFP = 1
IBP = 2
IBEAMP = 2212
c -----------------------------------------------------------------------
IF (PPCMS8 (5, IDIFP) .LT. DMP+DMPI0) THEN
PRINT *, '### FRAGPJ error: not enough energy! '
PRINT *, 'IBP: ', IBP
PRINT *, 'IDIFP: ', IDIFP
PRINT *, 'PPCMS8 (5, IDIFP): ', PPCMS8 (5, IDIFP)
PRINT *, 'DMP + DMPI0: ', DMP+DMPI0
CALL ERRLOG (40, 'F: FRAGPJ: Not enough energy!')
CALL H1STOP
END IF
if (stPROSPLIT.eq.1) then
SPLIT_POM = .true.
else if (stPROSPLIT.eq.0) then
SPLIT_POM = .false.
else
proba = H1RN()
if (proba.le.stPROSPLIT) then
SPLIT_POM = .true.
else
SPLIT_POM = .false.
endif
endif
if (SPLIT_POM) then
*
* Split proton into q - qq system: choose q and qq codes
* The pomeron couples with the same strength to u and d quarks.
* ud_1 and uu_1 are spin triplets, ud_0 is a spin singulett.
* Therefore q-qq is 1/7 u-ud_0, 3/7 u-ud_1, and 3/7 d-uu_1.
*
R = 7.0*H1RN()
IF (R .LE. 1.0) THEN
IQ = SIGN (2, IBEAMP)
IQQ = SIGN (2101, IBEAMP)
ELSE IF (R .LE. 4.0) THEN
IQ = SIGN (2, IBEAMP)
IQQ = SIGN (2103, IBEAMP)
ELSE
IQ = SIGN (1, IBEAMP)
IQQ = SIGN (2203, IBEAMP)
END IF
else
*
* q-qq probabilities in the ratio of the quark charge**4
*
R = 67.0*H1RN()
IF (R .LE. 3.0) THEN ! d (uu)_1
IQ = SIGN (1, IBEAMP)
IQQ = SIGN (2203, IBEAMP)
ELSE IF (R .LE. 19.0) THEN ! u (ud)_0
IQ = SIGN (2, IBEAMP)
IQQ = SIGN (2101, IBEAMP)
ELSE ! u (ud)_1
IQ = SIGN (2, IBEAMP)
IQQ = SIGN (2103, IBEAMP)
END IF
endif
C PRINT *, 'IQ: ', IQ, ', mass: ', ULMASS (IQ)
C PRINT *, 'IQQ: ', IQQ, ', mass: ', ULMASS (IQQ)
* Calculate the 4-vector of the proton remnant and of the struck quark
* To avoid numerical problems, calculate pomeron momentum from
* proton side
DO 10, I = 1, 4
PPOM (I) = PPCMS8 (I, IDIFP) - PPCMS8 (I, IBP)
10 CONTINUE
PPOM (5) = -SQRT (PPOM (1)**2+PPOM (2)**2+PPOM (3)**2-PPOM(4)**2)
CALL SPLITP (PPCMS8 (1, IBP), PPOM, PQ, PQQ, IERR)
NTRIAL = 0
12 CONTINUE
NTRIAL = NTRIAL+1
c --- diquark :
NLUJETS = NLUJETS +1
KLU(NLUJETS,2) = IQQ
PLU(NLUJETS,1) = sngl(PQQ(1))
PLU(NLUJETS,2) = sngl(PQQ(2))
PLU(NLUJETS,3) = sngl(PQQ(3))
PLU(NLUJETS,4) = sngl(PQQ(4))
PLU(NLUJETS,5) = sngl(PQQ(5))
KLU(NLUJETS,3) = iline
KLU(NLUJETS,1) = 3
KLU(NLUJETS,5) = NLUJETS+1
KLU(NLUJETS,4) = 10000 * (NLUJETS+1)
c --- quark :
NLUJETS = NLUJETS +1
KLU(NLUJETS,2) = IQ
PLU(NLUJETS,1) = sngl(PQ(1))
PLU(NLUJETS,2) = sngl(PQ(2))
PLU(NLUJETS,3) = sngl(PQ(3))
PLU(NLUJETS,4) = sngl(PQ(4))
PLU(NLUJETS,5) = sngl(PQ(5))
KLU(NLUJETS,3) = iline
KLU(NLUJETS,1) = 3
KLU(NLUJETS,4) = NLUJETS-1
KLU(NLUJETS,5) = 10000 * (NLUJETS-1)
c call lulist(1)
goto 999
* Define string between qq and q
IARR12(1) = NLUJETS-1
IARR12(2) = NLUJETS
CALL LUJOIN (2, IARR12)
C CALL LULIST (1)
* Perform fragmentation with JETSET
CALL LUEXEC
* Check for possible Error
IF (MSTU (24) .NE. 0) THEN
CALL ERRLOG (41, 'I: FRAGPJ: JETSET error')
NERR = NERR + 1
IF (NERR .LT. 100) THEN
PRINT *, ' *** FRAGPJ: JETSET error', MSTU (24)
END IF
ELSE IF (MSTU (28) .NE. 0) THEN
CALL ERRLOG (42, 'I: FRAGPJ: JETSET warning')
NERR = NERR + 1
IF (NERR .LT. 100) THEN
PRINT *, ' *** FRAGPJ: JETSET warning', MSTU (28)
END IF
END IF
IF (NTRIAL .LE. 10 .AND.
+ (MSTU (24) .NE. 0 .OR. MSTU (28) .NE. 0)) GO TO 12
IF (MSTU (24) .NE. 0) THEN
PRINT *, ' *** FRAGPJ: Cannot prevent JETSET error'
PRINT *, ' Mass: ', PPCMS8 (5, IDIFP)
CALL ERRLOG (43, 'S: FRAGPJ: Cannot prevent JETSET error')
ELSE IF (MSTU (28) .NE. 0) THEN
PRINT *, ' *** FRAGPJ: Cannot prevent JETSET warning'
PRINT *, ' Mass: ', PPCMS8 (5, IDIFP)
CALL ERRLOG (44, 'W: FRAGPJ: Cannot prevent JETSET warning')
END IF
C CALL LULIST (1)
* Print control output:
C PRINT *, 'FRAGPJ: Result'
C PRINT *, 'ISCN: ', ISCN
C CALL PR5V8 ('p_pdif', PPCMS8 (1, IDIFP))
C CALL PR5S ('JETSET',PLU(0,1),PLU(0,2),PLU(0,3),PLU(0,4),PLU(0,5))
999 continue
RETURN
END