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hijfrg.F
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* $Id$
C
C
C
C
SUBROUTINE HIJFRG(JTP,NTP,IERROR)
C NTP=1, fragment proj string, NTP=2, targ string,
C NTP=3, independent
C strings from jets. JTP is the line number of the string
C*******Fragment all leading strings of proj and targ**************
C IHNT2(1)=atomic #, IHNT2(2)=proton #(=-1 if anti-proton) *
C******************************************************************
#define BLANKET_SAVE
#include "hiparnt.inc"
#include "hijdat.inc"
#include "histrng.inc"
#include "hijjet1.inc"
#include "hijjet2.inc"
C
#include "lujets_hijing.inc"
#include "ludat1_hijing.inc"
SAVE
IERROR=0
CALL LUEDIT_HIJING(0)
N=0
C ********initialize the document lines
IF(NTP.EQ.3) THEN
ISG=JTP
N=NJSG(ISG)
DO 100 I=1,NJSG(ISG)
K(I,1)=K1SG(ISG,I)
K(I,2)=K2SG(ISG,I)
P(I,1)=PXSG(ISG,I)
P(I,2)=PYSG(ISG,I)
P(I,3)=PZSG(ISG,I)
P(I,4)=PESG(ISG,I)
P(I,5)=PMSG(ISG,I)
100 CONTINUE
C IF(IHPR2(1).GT.0) CALL ATTRAD(IERROR)
c IF(IERROR.NE.0) RETURN
C CALL LULIST_HIJING(1)
CALL LUEXEC_HIJING
RETURN
ENDIF
C
IF(NTP.EQ.2) GO TO 200
IF(JTP.GT.IHNT2(1)) RETURN
IF(NFP(JTP,5).NE.3.AND.NFP(JTP,3).NE.0
& .AND.NPJ(JTP).EQ.0.AND.NFP(JTP,10).EQ.0) GO TO 1000
IF(NFP(JTP,15).EQ.-1) THEN
KF1=NFP(JTP,2)
KF2=NFP(JTP,1)
PQ21=PP(JTP,6)
PQ22=PP(JTP,7)
PQ11=PP(JTP,8)
PQ12=PP(JTP,9)
AM1=PP(JTP,15)
AM2=PP(JTP,14)
ELSE
KF1=NFP(JTP,1)
KF2=NFP(JTP,2)
PQ21=PP(JTP,8)
PQ22=PP(JTP,9)
PQ11=PP(JTP,6)
PQ12=PP(JTP,7)
AM1=PP(JTP,14)
AM2=PP(JTP,15)
ENDIF
C ********for NFP(JTP,15)=-1 NFP(JTP,1) IS IN -Z DIRECTION
PB1=PQ11+PQ21
PB2=PQ12+PQ22
PB3=PP(JTP,3)
PECM=PP(JTP,5)
BTZ=PB3/PP(JTP,4)
IF((ABS(PB1-PP(JTP,1)).GT.0.01.OR.
& ABS(PB2-PP(JTP,2)).GT.0.01).AND.IHPR2(10).NE.0)
& WRITE(6,*) ' Pt of Q and QQ do not sum to the total'
GO TO 300
200 IF(JTP.GT.IHNT2(3)) RETURN
IF(NFT(JTP,5).NE.3.AND.NFT(JTP,3).NE.0
& .AND.NTJ(JTP).EQ.0.AND.NFT(JTP,10).EQ.0) GO TO 1200
IF(NFT(JTP,15).EQ.1) THEN
KF1=NFT(JTP,1)
KF2=NFT(JTP,2)
PQ11=PT(JTP,6)
PQ12=PT(JTP,7)
PQ21=PT(JTP,8)
PQ22=PT(JTP,9)
AM1=PT(JTP,14)
AM2=PT(JTP,15)
ELSE
KF1=NFT(JTP,2)
KF2=NFT(JTP,1)
PQ11=PT(JTP,8)
PQ12=PT(JTP,9)
PQ21=PT(JTP,6)
PQ22=PT(JTP,7)
AM1=PT(JTP,15)
AM2=PT(JTP,14)
ENDIF
C ********for NFT(JTP,15)=1 NFT(JTP,1) IS IN +Z DIRECTION
PB1=PQ11+PQ21
PB2=PQ12+PQ22
PB3=PT(JTP,3)
PECM=PT(JTP,5)
BTZ=PB3/PT(JTP,4)
IF((ABS(PB1-PT(JTP,1)).GT.0.01.OR.
& ABS(PB2-PT(JTP,2)).GT.0.01).AND.IHPR2(10).NE.0)
& WRITE(6,*) ' Pt of Q and QQ do not sum to the total'
300 IF(PECM.LT.HIPR1(1)) THEN
IERROR=1
IF(IHPR2(10).EQ.0) RETURN
WRITE(6,*) ' ECM=',PECM,' energy of the string is too small'
RETURN
ENDIF
AMT=PECM**2+PB1**2+PB2**2
AMT1=AM1**2+PQ11**2+PQ12**2
AMT2=AM2**2+PQ21**2+PQ22**2
PZCM=SQRT(ABS(AMT**2+AMT1**2+AMT2**2-2.0*AMT*AMT1
& -2.0*AMT*AMT2-2.0*AMT1*AMT2))/2.0/SQRT(AMT)
C *******PZ of end-partons in c.m. frame of the string
K(1,1)=2
K(1,2)=KF1
P(1,1)=PQ11
P(1,2)=PQ12
P(1,3)=PZCM
P(1,4)=SQRT(AMT1+PZCM**2)
P(1,5)=AM1
K(2,1)=1
K(2,2)=KF2
P(2,1)=PQ21
P(2,2)=PQ22
P(2,3)=-PZCM
P(2,4)=SQRT(AMT2+PZCM**2)
P(2,5)=AM2
N=2
C*****
CALL HIROBO(0.0,0.0,0.0,0.0,BTZ)
JETOT=0
IF((PQ21**2+PQ22**2).GT.(PQ11**2+PQ12**2)) THEN
PMAX1=P(2,1)
PMAX2=P(2,2)
PMAX3=P(2,3)
ELSE
PMAX1=P(1,1)
PMAX2=P(1,2)
PMAX3=P(1,3)
ENDIF
IF(NTP.EQ.1) THEN
PP(JTP,10)=PMAX1
PP(JTP,11)=PMAX2
PP(JTP,12)=PMAX3
ELSE IF(NTP.EQ.2) THEN
PT(JTP,10)=PMAX1
PT(JTP,11)=PMAX2
PT(JTP,12)=PMAX3
ENDIF
C*******************attach produced jets to the leading partons****
IF(NTP.EQ.1.AND.NPJ(JTP).NE.0) THEN
JETOT=NPJ(JTP)
C IF(NPJ(JTP).GE.2) CALL HIJSRT(JTP,1)
C ********sort jets in order of y
IEX=0
IF((ABS(KF1).GT.1000.AND.KF1.LT.0)
& .OR.(ABS(KF1).LT.1000.AND.KF1.GT.0)) IEX=1
DO 520 I=N,2,-1
DO 520 J=1,5
II=NPJ(JTP)+I
K(II,J)=K(I,J)
P(II,J)=P(I,J)
V(II,J)=V(I,J)
520 CONTINUE
DO 540 I=1,NPJ(JTP)
DO 542 J=1,5
K(I+1,J)=0
V(I+1,J)=0
542 CONTINUE
I0=I
IF(IEX.EQ.1) I0=NPJ(JTP)-I+1
C ********reverse the order of jets
KK1=KFPJ(JTP,I0)
K(I+1,1)=2
K(I+1,2)=KK1
IF(KK1.NE.21 .AND. KK1.NE.0) K(I+1,1)=
& 1+(ABS(KK1)+(2*IEX-1)*KK1)/2/ABS(KK1)
P(I+1,1)=PJPX(JTP,I0)
P(I+1,2)=PJPY(JTP,I0)
P(I+1,3)=PJPZ(JTP,I0)
P(I+1,4)=PJPE(JTP,I0)
P(I+1,5)=PJPM(JTP,I0)
540 CONTINUE
N=N+NPJ(JTP)
ELSE IF(NTP.EQ.2.AND.NTJ(JTP).NE.0) THEN
JETOT=NTJ(JTP)
c IF(NTJ(JTP).GE.2) CALL HIJSRT(JTP,2)
C ********sort jets in order of y
IEX=1
IF((ABS(KF2).GT.1000.AND.KF2.LT.0)
& .OR.(ABS(KF2).LT.1000.AND.KF2.GT.0)) IEX=0
DO 560 I=N,2,-1
DO 560 J=1,5
II=NTJ(JTP)+I
K(II,J)=K(I,J)
P(II,J)=P(I,J)
V(II,J)=V(I,J)
560 CONTINUE
DO 580 I=1,NTJ(JTP)
DO 582 J=1,5
K(I+1,J)=0
V(I+1,J)=0
582 CONTINUE
I0=I
IF(IEX.EQ.1) I0=NTJ(JTP)-I+1
C ********reverse the order of jets
KK1=KFTJ(JTP,I0)
K(I+1,1)=2
K(I+1,2)=KK1
IF(KK1.NE.21 .AND. KK1.NE.0) K(I+1,1)=
& 1+(ABS(KK1)+(2*IEX-1)*KK1)/2/ABS(KK1)
P(I+1,1)=PJTX(JTP,I0)
P(I+1,2)=PJTY(JTP,I0)
P(I+1,3)=PJTZ(JTP,I0)
P(I+1,4)=PJTE(JTP,I0)
P(I+1,5)=PJTM(JTP,I0)
580 CONTINUE
N=N+NTJ(JTP)
ENDIF
IF(IHPR2(1).GT.0.AND.RLU_HIJING(0).LE.HIDAT(3)) THEN
HIDAT20=HIDAT(2)
HIPR150=HIPR1(5)
IF(IHPR2(8).EQ.0.AND.IHPR2(3).EQ.0.AND.IHPR2(9).EQ.0)
& HIDAT(2)=2.0
IF(HINT1(1).GE.1000.0.AND.JETOT.EQ.0)THEN
HIDAT(2)=3.0
HIPR1(5)=5.0
ENDIF
CALL ATTRAD(IERROR)
HIDAT(2)=HIDAT20
HIPR1(5)=HIPR150
ELSE IF(JETOT.EQ.0.AND.IHPR2(1).GT.0.AND.
& HINT1(1).GE.1000.0.AND.
& RLU_HIJING(0).LE.0.8) THEN
HIDAT20=HIDAT(2)
HIPR150=HIPR1(5)
HIDAT(2)=3.0
HIPR1(5)=5.0
IF(IHPR2(8).EQ.0.AND.IHPR2(3).EQ.0.AND.IHPR2(9).EQ.0)
& HIDAT(2)=2.0
CALL ATTRAD(IERROR)
HIDAT(2)=HIDAT20
HIPR1(5)=HIPR150
ENDIF
IF(IERROR.NE.0) RETURN
C ******** conduct soft radiations
C****************************
C
C
C CALL LULIST_HIJING(1)
CALL LUEXEC_HIJING
RETURN
1000 N=1
K(1,1)=1
K(1,2)=NFP(JTP,3)
DO 1100 JJ=1,5
P(1,JJ)=PP(JTP,JJ)
1100 CONTINUE
C ********proj remain as a nucleon or delta
CALL LUEXEC_HIJING
C call LULIST_HIJING(1)
RETURN
C
1200 N=1
K(1,1)=1
K(1,2)=NFT(JTP,3)
DO 1300 JJ=1,5
P(1,JJ)=PT(JTP,JJ)
1300 CONTINUE
C ********targ remain as a nucleon or delta
CALL LUEXEC_HIJING
C call LULIST_HIJING(1)
RETURN
END