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C***********************************************************************
C $Id: arinit.F,v 0.17 1992/03/11 14:14:59 lonnblad Exp $
C**********************************************************************C
C C
C A R I A D N E C
C C
C A Monte Carlo program for colour dipole radiation C
C C
C Version 4 revision 02 C
C Latest date of change: 30 Apr 1992 C
C C
C Author : C
C C
C Leif Lonnblad C
C C
C Deutsches Elektronen Synchrotron - DESY C
C Notkestrasse 85, 2000 Hamburg 50, Germany C
C C
C tel int+49-4089982048 C
C fax int+49-4089982777 C
C C
C E-mail lonnblad@apollo3.desy.de C
C C
C Copyright (C) 1992 Leif Lonnblad C
C C
C Please report any errors to the author C
C C
C**********************************************************************C
C**********************************************************************C
C This program must be loaded together with JETSET 73 C
C The model is described in Nucl. Phys. B306 (1988) 746, C
C Z. Phys. C43 (1989) 625, and Nucl. Phys. B339 (1990) 393. C
C**********************************************************************C
C***********************************************************************
CCPH: Double precision (B) used.
CCPH:.. This version of ARIADNE is to be used with FRITIOF 7.1
CCPH:.. All Fritiof-associated changes can be searched under "CCPH"
CCPH: The role of LUJETS common block is replaced by
CCPH: COMMON /ARJETX/ N,K(1000,5),P(1000,5),V(1000,5)
CCPH:.. Since Fritiof requires the strings to be treated one at a time,
CCPH: the original approach of having entire LUJETS to be treated
CCPH: by Ariadne is not possible to use. Therefore this approach
CCPH: of replacing LUJETS by ARJETX is adopted. After emission is done,
CCPH: the partons can be copied back onto LUJETS in Fritiof.
CCPH:
C***********************************************************************
SUBROUTINE ARINIT(MODE)
C...ARiadne subroutine INITialize
C...Initializes Ariadne to run with other (Lund) MC programs
PARAMETER(MAXDIP=500,MAXPAR=500,MAXSTR=100)
IMPLICIT DOUBLE PRECISION (D)
IMPLICIT DOUBLE PRECISION (B)
IMPLICIT LOGICAL (Q)
COMMON /ARPART/ BP(MAXPAR,5),IFL(MAXPAR),IEX(MAXPAR),QQ(MAXPAR),
$ IDI(MAXPAR),IDO(MAXPAR),INO(MAXPAR),IPART
SAVE /ARPART/
COMMON /ARDIPS/ BX1(MAXDIP),BX3(MAXDIP),PT2IN(MAXDIP),
$ SDIP(MAXDIP),IP1(MAXDIP),IP3(MAXDIP),
$ AEX1(MAXDIP),AEX3(MAXDIP),QDONE(MAXDIP),
$ QEM(MAXDIP),IRAD(MAXDIP),ISTR(MAXDIP),IDIPS
SAVE /ARDIPS/
COMMON /ARSTRS/ IPF(MAXSTR),IPL(MAXSTR),IFLOW(MAXSTR),
$ PT2LST,IMF,IML,IO,QDUMP,ISTRS
SAVE /ARSTRS/
COMMON /ARDAT1/ PARA(40),MSTA(40)
SAVE /ARDAT1/
COMMON /ARDAT2/ PQMAS(10)
SAVE /ARDAT2/
COMMON /ARDAT3/ IWRN(40)
SAVE /ARDAT3/
COMMON /ARJETX/ N,K(1000,5),P(1000,5),V(1000,5)
SAVE /ARJETX/
COMMON /LUDAT1/ MSTU(200),PARU(200),MSTJ(200),PARJ(200)
SAVE /LUDAT1/
COMMON /LUDAT2/ KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
SAVE /LUDAT2/
COMMON /LEPTOU/ CUT(14),LST(40),PARL(30),X,Y,W2,XQ2,U
SAVE /LEPTOU/
COMMON /PYPARS/ MSTP(200),PARP(200),MSTI(200),PARI(200)
SAVE /PYPARS/
COMMON /PYSUBS/ MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200)
SAVE /PYSUBS/
CHARACTER MODE*(*)
C...Set output files if not already done
IF(MSTA(7).LT.0) MSTA(7)=MSTU(11)
IF(MSTA(8).LT.0) MSTA(8)=MSTU(11)
C...Write out header
WRITE(MSTA(7),1000)
MSTA(2)=1
C...If Ariadne mode, do nothing special
IF(MODE(1:7).EQ.'ARIADNE') THEN
MSTA(1)=0
C...If JETSET mode, switch off cascade and fragmentation in JETSET
ELSEIF(MODE(1:6).EQ.'JETSET') THEN
MSTA(1)=1
MSTA(5)=MIN(MAX(MSTJ(105),0),1)
MSTJ(101)=5
MSTJ(41)=0
MSTJ(105)=0
WRITE(MSTA(7),1010)
C...If PYTHIA mode, switch off cascades and fragmentation. Check that
C...Ariadne can handle selected processes
ELSEIF(MODE(1:6).EQ.'PYTHIA') THEN
MSTA(1)=2
WRITE(MSTA(7),1020)
MSTA(5)=MIN(MAX(MSTP(111),0),1)
MSTP(61)=0
MSTP(71)=0
MSTP(111)=0
C...If LEPTO mode, switch off cascades and fragmentation.
ELSEIF(MODE(1:5).EQ.'LEPTO') THEN
MSTA(1)=3
WRITE(MSTA(7),1030)
LST(8)=9
MSTA(5)=MIN(MAX(LST(7),0),1)
LST(7)=0
ENDIF
C...Set quark masses
IF(MSTA(24).GT.0) THEN
DO 100 I=1,8
PQMAS(I)=PMAS(I,1)
100 CONTINUE
ENDIF
IF(MSTA(24).GE.2) THEN
DO 110 I=1,5
PQMAS(I)=PARF(100+I)
110 CONTINUE
ENDIF
IF(MSTA(3).EQ.1) CALL ARTUNE('DELPHI')
1000 FORMAT(/,14X,
$ 'The Lund Monte Carlo - Ariadne version 4 revision 02',/,
$ 23X,'Latest date of change: 30 Apr 1992')
1010 FORMAT(18X,'Initialization done for running with JETSET')
1020 FORMAT(18X,'Initialization done for running with PYTHIA')
1030 FORMAT(18X,'Initialization done for running with LEPTO')
RETURN
C**** END OF ARINIT ****************************************************
END
C***********************************************************************
BLOCK DATA ARDATA
C...ARiadne block DATA statements
C...Initialization of the common blocks used in Ariadne
PARAMETER(MAXDIP=500,MAXPAR=500,MAXSTR=100)
IMPLICIT DOUBLE PRECISION (D)
IMPLICIT DOUBLE PRECISION (B)
IMPLICIT LOGICAL (Q)
COMMON /ARDAT1/ PARA(40),MSTA(40)
SAVE /ARDAT1/
COMMON /ARDAT2/ PQMAS(10)
SAVE /ARDAT2/
COMMON /ARDAT3/ IWRN(40)
SAVE /ARDAT3/
C...Breif explanation of parameters and switches:
C...
C...
C...Parameters:
C...
C...PARA(1) (D=0.200) lambda_QCD
C...PARA(2) (D=0.200) Constant alpha_QCD for MSTA(12)=0
C...PARA(3) (D=1.000) Cutoff in invariant p_t for QCD emission
C...PARA(4) (D=1/137) Constant alpha_EM
C...PARA(5) (D=1.000) Cutoff in invariant p_t for EM emission
C...PARA(6) (D=-1.00) Maximum allowed invariant p_t (if >0)
C...PARA(7) (D=0.000) Maximum invariant mass (if >0)
C...PARA(8-9) not used
C...PARA(10)(D=1.000) Power in soft suppression (dimnsionality of
C... the extended source)
C...PARA(11)(D=0.938) Soft suppression parameter for code 1
C...PARA(12)(D=0.938) Soft suppression parameter for code 2
C...PARA(13)(D=0.938) Soft suppression parameter for code 3
C...PARA(14-19) not used
C...PARA(20)(D=1.000) Minimum p_t^2/Q^2 of q-qbar pair in boson-gluon
C... fusion to be allowed to be treated as such. Else
C... treated as sea-quark interaction. Only used when
C... running with LEPTO version 6.0 or higher
C...PARA(21-30) not used
C...PARA(31)(D=1.000) Maximum invariant p_t^2 for clustering three jets
C... into two in ARCLUS
C...PARA(32-38) not used
C...PARA(39)(D=0.001) Tolerance factor for momentum conservation
C...PARA(40)(D=1E32) Maximum allowed floating point number ("minimum"
C... is 1/PARA(40)
C...
C...Switches:
C...
C...MSTA(1) (R) Ariadne mode (set by ARINIT) for treatment of
C... incomming events.
C... 0 => No special treatment
C... 1 => as if produced by JETSET
C... 2 => as if produced by PYTHIA
C... 3 => as if produced by LEPTO
C...MSTA(2) (I) Initialization done and headers written
C...MSTA(3) (D=0) Setting of parameters in Ariadne, JETSET,
C... PYTHIA and LEPTO to suitable values.
C... 0 => off
C... 1 => on
C...MSTA(4) (I) Number of calls made to AREXEC
C...MSTA(5) (D=0) Perform fragmentation at the end of AREXEC
C... 0 => off
C... 1 => on
C... When running with JETSET, PYTHIA or LEPTO this
C... switch is set to the value of the corresponding
C... switch in these programs.
C...MSTA(6) (D=-1) Maximum number of emission (per string) in a
C... AREXEC call (if <0 - no limit)
C...MSTA(7) (D=6) File number for output (stdout) from Ariadne
C... set to MSTU(11) by ARINIT
C...MSTA(8) (D=6) File number for error messages (stdout) from
C... Ariadne
C...MSTA(9) (D=1) Debug mode
C... 0 => debug off
C... 1 => check that energy and momentum is conserved after
C... each call to AREXEC produce. Warns if change
C... in momentum is larger a factor PARA(39)
C... 2 => as for 1 but check every emission
C... 3 => as for 2 but dump string to /LUJETS/ after each
C... emission
C...MSTA(10)(D=5) Maximum number of warnings (of each kind) issued
C... by Ariadne
C...MSTA(11)(D=0) Phase space restrictions. The maximum p_t of an
C... emission is set to the p_t of the last emission
C... (otherwise no restrictions) for:
C... gluon q-qbar photon emissions
C... 0 => yes yes yes
C... 1 => yes yes no
C... 2 => yes no yes
C... 3 => yes no no
C... 4 => no no no
C...MSTA(12)(D=1) Running alpha_QCD
C... 0 => off
C... 1 => on
C...MSTA(13) (R) Error experienced by Ariadne in last call to
C... AREXECc. Reset to 0 at each call to AREXEC
C...MSTA(14)(D=1) The maximum allowed p_t is set to the minimum
C... invariant p_t of all gluons in an incomming
C... string
C... 0 => off
C... 1 => on
C...MSTA(15)(D=5) Number of flavours allowed in q-qbar emission
C...MSTA(16)(D=2) Recoil treatment
C... 0 => minimize p_t1^2 + p_t3^2
C... 1 => as for 0 but pointlike string ends takes
C... all recoil
C... 2=> as for 0 but also extended string ends which
C... have a>0 takes full recoil
C...MSTA(17)(D=2) Recoil treatment for extended dipoles
C... 0 => no special treatment (but cf. MSTA(16))
C... 1 => emit recoil gluon (except if pointlike quark
C... in other dipole end for MSTA(16)=1)
C... 2 => emit recoilgluon according to new strategy
C...MSTA(18)(D=1) P_t ordering of recoil gluons
C... 0 => off
C... 1 => on
C...MSTA(19)(D=1) Correct or quick treatment of emissions from
C... heavy quarks
C... 0 => quick
C... 1 => correct
C...MSTA(20)(D=0) Final state photon radiation
C... 0 => off
C... 1 => on
C... 2 => on but turned off at the first occurence of
C... q-qbar emission in a string.
C...MSTA(21)(D=0) Photon radiation when run with PYTHIA or LEPTO
C... 0 => off
C... 1 => on
C...MSTA(22)(D=0) Transfer of recoils in Drell-Yan processes
C... 0 => off
C... 1 => on
C...MSTA(23)(I) Line number of particle to transfer recoil to
C... for MSTA(22) > 0
C...MSTA(24)(D=2) Quark masses to be used in q-qbar emissions
C... 0 => as specified in PMAS(1-8) in /ARDAT2/
C... 1 => "bare" quark masses as specified in PMAS(1-8)
C... in /LUDAT2/
C... 2 => "constituent" quark masses as specified in
C... PARF(101-108) in /LUDAT2/
C..MSTA(25) (D=1)
C =0 use wrong matrix element for backward compatibility with
c version 4.01-4.04
C =1 Correct matrix element with Pt^2 as ordering variable
C...MSTA(26-29) not used
C...MSTA(30)(D=1) various options for running with Lepto
C... 0 => Stuck quark point like, remnant extended with PARA(11)
C... 1 => as 0 but remnant extended with PARA(11)/(1-x)
C... 2 => as 1 bur struck quark extended with Q
C...MSTA(31)(D=1) mass of extended partons
C... 0 => set to zero for backward compatibility
C... 1 => keeps value given
C...MSTA(32-40) not used
C...
C...End of description
DATA PARA/0.2,0.2,1.0,0.007297353,1.0,-1.0,0.0,0.0,0.0,1.0,
$ 0.938,0.938,0.938,6*0.0,1.0,
$ 10*0.0,
$ 1.0,7*0.0,0.001,1.0E32/
DATA MSTA/0,0,0,0,0,-1,6,6,1,5,
$ 0,1,0,1,5,2,2,1,1,0,
$ 0,0,0,2,1,4*0,1,
$ 1,9*0/
DATA PQMAS/10*0.0/
DATA IWRN/40*0/
C**** END OF ARDATA ****************************************************
END
C***********************************************************************
C $Id: araddg.F,v 0.5 1992/01/31 16:14:59 lonnblad Exp $
SUBROUTINE ARADDG(ID)
C...ARiadne subroutine ADD Gluon
C...Adds a gluon entry between the partons in dipole ID thus creating
C...a new dipole
PARAMETER(MAXDIP=500,MAXPAR=500,MAXSTR=100)
IMPLICIT DOUBLE PRECISION (D)
IMPLICIT DOUBLE PRECISION (B)
IMPLICIT LOGICAL (Q)
COMMON /ARPART/ BP(MAXPAR,5),IFL(MAXPAR),IEX(MAXPAR),QQ(MAXPAR),
$ IDI(MAXPAR),IDO(MAXPAR),INO(MAXPAR),IPART
SAVE /ARPART/
COMMON /ARDIPS/ BX1(MAXDIP),BX3(MAXDIP),PT2IN(MAXDIP),
$ SDIP(MAXDIP),IP1(MAXDIP),IP3(MAXDIP),
$ AEX1(MAXDIP),AEX3(MAXDIP),QDONE(MAXDIP),
$ QEM(MAXDIP),IRAD(MAXDIP),ISTR(MAXDIP),IDIPS
SAVE /ARDIPS/
COMMON /ARSTRS/ IPF(MAXSTR),IPL(MAXSTR),IFLOW(MAXSTR),
$ PT2LST,IMF,IML,IO,QDUMP,ISTRS
SAVE /ARSTRS/
INXT(I)=IDO(IP3(I))
IPRV(I)=IDI(IP1(I))
C...Allocate new gluon and new dipole at postitons IPART+1 and IDIPS+1
C...if there is space left.
IPART=IPART+1
IDIPS=IDIPS+1
IF(IPART.GE.MAXPAR-1) CALL ARERRM('ARADDG',6,0)
IF(IDIPS.GE.MAXDIP-1) CALL ARERRM('ARADDG',7,0)
C...Set properties of new gluon
DO 100 I=1,5
BP(IPART,I)=0.0
100 CONTINUE
IFL(IPART)=21
IEX(IPART)=0
QQ(IPART)=.FALSE.
IDI(IPART)=ID
IDO(IPART)=IDIPS
C...Set properties of new dipole
IP1(IDIPS)=IPART
IP3(IDIPS)=IP3(ID)
QDONE(IDIPS)=.FALSE.
QEM(IDIPS)=.FALSE.
ISTR(IDIPS)=ISTR(ID)
C...Fix pointers for old dipole
IP3(ID)=IPART
IDI(IP3(IDIPS))=IDIPS
IF(IPRV(ID).NE.0) QDONE(IPRV(ID))=.FALSE.
QDONE(ID)=.FALSE.
IF(INXT(IDIPS).NE.0) QDONE(INXT(IDIPS))=.FALSE.
RETURN
C**** END OF ARADDG ****************************************************
END
C***********************************************************************
C $Id: arangl.F,v 0.2 1991/09/26 12:41:40 lonnblad Exp $
REAL FUNCTION ARANGL(I1,I2)
C...ARiadne function ANGLe
C...Returns the angle between paron I1 and I2
PARAMETER(MAXDIP=500,MAXPAR=500,MAXSTR=100)
IMPLICIT DOUBLE PRECISION (D)
IMPLICIT DOUBLE PRECISION (B)
IMPLICIT LOGICAL (Q)
COMMON /ARPART/ BP(MAXPAR,5),IFL(MAXPAR),IEX(MAXPAR),QQ(MAXPAR),
$ IDI(MAXPAR),IDO(MAXPAR),INO(MAXPAR),IPART
SAVE /ARPART/
ARANGL=BP(I1,1)*BP(I2,1)+BP(I1,2)*BP(I2,2)+BP(I1,3)*BP(I2,3)
BP1=SQRT(BP(I1,1)**2+BP(I1,2)**2+BP(I1,3)**2)
BP2=SQRT(BP(I2,1)**2+BP(I2,2)**2+BP(I2,3)**2)
ARANGL=ACOS(ARANGL/(BP1*BP2))
RETURN
C**** END OF ARANGL ****************************************************
END
C***********************************************************************
C $Id: arbocm.F,v 0.5 1991/11/06 13:46:04 lonnblad Exp $
SUBROUTINE ARBOCM(ID)
C...ARiadne subroutine BOost to Center of Mass
C...Boost the partons in dipole ID to the CMS of the dipole
PARAMETER(MAXDIP=500,MAXPAR=500,MAXSTR=100)
IMPLICIT DOUBLE PRECISION (D)
IMPLICIT DOUBLE PRECISION (B)
IMPLICIT LOGICAL (Q)
COMMON /ARPART/ BP(MAXPAR,5),IFL(MAXPAR),IEX(MAXPAR),QQ(MAXPAR),
$ IDI(MAXPAR),IDO(MAXPAR),INO(MAXPAR),IPART
SAVE /ARPART/
COMMON /ARDIPS/ BX1(MAXDIP),BX3(MAXDIP),PT2IN(MAXDIP),
$ SDIP(MAXDIP),IP1(MAXDIP),IP3(MAXDIP),
$ AEX1(MAXDIP),AEX3(MAXDIP),QDONE(MAXDIP),
$ QEM(MAXDIP),IRAD(MAXDIP),ISTR(MAXDIP),IDIPS
SAVE /ARDIPS/
COMMON /ARSTRS/ IPF(MAXSTR),IPL(MAXSTR),IFLOW(MAXSTR),
$ PT2LST,IMF,IML,IO,QDUMP,ISTRS
SAVE /ARSTRS/
COMMON /ARINT2/ DBEX,DBEY,DBEZ,PHI,THE
SAVE /ARINT2/
C...Calculate boostvector and boost
I1=IP1(ID)
I3=IP3(ID)
DPE1=BP(I1,4)
DPE3=BP(I3,4)
DPE=DPE1+DPE3
DPX1=BP(I1,1)
DPX3=BP(I3,1)
DBEX=(DPX1+DPX3)/DPE
DPY1=BP(I1,2)
DPY3=BP(I3,2)
DBEY=(DPY1+DPY3)/DPE
DPZ1=BP(I1,3)
DPZ3=BP(I3,3)
DBEZ=(DPZ1+DPZ3)/DPE
CALL AROBO2(0.0,0.0,-DBEX,-DBEY,-DBEZ,I1,I3)
C...Calculate rotation angles but no need for rotation yet
PX=BP(I1,1)
PY=BP(I1,2)
PZ=BP(I1,3)
PHI=ULANGL(PX,PY)
THE=ULANGL(PZ,SQRT(PX**2+PY**2))
RETURN
C**** END OF ARBOCM ****************************************************
END
C***********************************************************************
C $Id: arcasc.F,v 0.7 1992/04/28 13:16:33 lonnblad Exp $
SUBROUTINE ARCASCtmp
C...ARiadne subroutine perform dipole CASCade
C...Performs a colour dipole cascade on string put in the ariadne
C...event record.
PARAMETER(MAXDIP=500,MAXPAR=500,MAXSTR=100)
IMPLICIT DOUBLE PRECISION (D)
IMPLICIT DOUBLE PRECISION (B)
IMPLICIT LOGICAL (Q)
COMMON /ARPART/ BP(MAXPAR,5),IFL(MAXPAR),IEX(MAXPAR),QQ(MAXPAR),
$ IDI(MAXPAR),IDO(MAXPAR),INO(MAXPAR),IPART
SAVE /ARPART/
COMMON /ARDIPS/ BX1(MAXDIP),BX3(MAXDIP),PT2IN(MAXDIP),
$ SDIP(MAXDIP),IP1(MAXDIP),IP3(MAXDIP),
$ AEX1(MAXDIP),AEX3(MAXDIP),QDONE(MAXDIP),
$ QEM(MAXDIP),IRAD(MAXDIP),ISTR(MAXDIP),IDIPS
SAVE /ARDIPS/
COMMON /ARSTRS/ IPF(MAXSTR),IPL(MAXSTR),IFLOW(MAXSTR),
$ PT2LST,IMF,IML,IO,QDUMP,ISTRS
SAVE /ARSTRS/
COMMON /ARDAT1/ PARA(40),MSTA(40)
SAVE /ARDAT1/
C...Calculate total momentum of strings for debugging
IF(MSTA(9).GT.0) CALL ARCHEM(1)
C...Reset counter
IO=0
C...Loop over all dipole to find largest possible p_t^2
100 ISEL=0
PT2MAX=0.0
DO 110 I=1,IDIPS
PT2I=ARGPT2(I)
IF(PT2I.GT.PT2MAX) THEN
PT2MAX=PT2I
ISEL=I
ENDIF
110 CONTINUE
C...Check that largest p_t^2 is above cuts.
IF(ISEL.GT.0) THEN
IF((QEM(ISEL).AND.PT2MAX.LE.PARA(5)**2).OR.
$ ((.NOT.QEM(ISEL)).AND.PT2MAX.LE.PARA(3)**2)) ISEL=0
ENDIF
IF(MSTA(6).GE.0.AND.IO.GE.MSTA(6)) ISEL=0
C...Exit if below cuts or limit of number of emissions is reached
IF(ISEL.EQ.0) THEN
CALL ARDUMP
IF(MSTA(9).GT.0) CALL ARCHEM(0)
RETURN
ENDIF
C...Perform the emission
IO=IO+1
PT2LST=PT2MAX
CALL AREMIT(ISEL)
QDUMP=.FALSE.
C...Check total momentum and dump according to debug mode
IF(MSTA(9).GT.2) CALL ARDUMP
IF(MSTA(9).GT.1) CALL ARCHEM(0)
GOTO 100
C**** END OF ARCASC ****************************************************
END
C***********************************************************************
C $Id: archem.F,v 0.6 1992/01/31 16:14:59 lonnblad Exp $
SUBROUTINE ARCHEM(IMOD)
C...ARiadne subroutine CHEck Momentum conservation
C...Checks that momentum is conserved in ariadne
PARAMETER(MAXDIP=500,MAXPAR=500,MAXSTR=100)
IMPLICIT DOUBLE PRECISION (D)
IMPLICIT DOUBLE PRECISION (B)
IMPLICIT LOGICAL (Q)
COMMON /ARPART/ BP(MAXPAR,5),IFL(MAXPAR),IEX(MAXPAR),QQ(MAXPAR),
$ IDI(MAXPAR),IDO(MAXPAR),INO(MAXPAR),IPART
SAVE /ARPART/
COMMON /ARINT3/ DPTOT(5)
SAVE /ARINT3/
COMMON /ARDAT1/ PARA(40),MSTA(40)
SAVE /ARDAT1/
COMMON /ARJETX/ N,K(1000,5),P(1000,5),V(1000,5)
SAVE /ARJETX/
DIMENSION DTOT(5)
C...Reset momentum counter. Include Drell-Yan produced particle
C...if present and check its momentum consistency.
IF(MSTA(23).GT.0) THEN
I=MSTA(23)
DO 100 J=1,4
DTOT(J)=P(I,J)
100 CONTINUE
IF(ABS(P(I,4)**2-P(I,3)**2-P(I,2)**2-P(I,1)**2-P(I,5)**2)
$ .GT.PARA(39)*P(I,4)**2) CALL ARERRM('ARCHEM',10,I)
ELSE
DO 110 J=1,4
DTOT(J)=0.0D0
110 CONTINUE
ENDIF
C...Sum all partons momentum and check their momentum concistency.
DO 120 I=1,IPART
DO 130 J=1,4
DTOT(J)=DTOT(J)+BP(I,J)
130 CONTINUE
IF(ABS(BP(I,4)**2-BP(I,3)**2-BP(I,2)**2-BP(I,1)**2-BP(I,5)**2)
$ .GT.PARA(39)*BP(I,4)**2.AND.MSTA(9).GE.2)
$ CALL ARERRM('ARCHEM',10,I+N)
120 CONTINUE
DTOT(5)=DSQRT(DTOT(4)**2-DTOT(3)**2-DTOT(2)**2-DTOT(1)**2)
C...If IMOD=1 save total momentum for later use
IF(IMOD.EQ.1) THEN
DO 200 J=1,5
DPTOT(J)=DTOT(J)
200 CONTINUE
RETURN
ENDIF
C...IF IMOD=1 compare total momentum with old one
DO 300 J=1,5
IF(ABS(DTOT(J)-DPTOT(J)).GT.DPTOT(5)*PARA(39))
$ CALL ARERRM('ARCHEM',9,0)
300 CONTINUE
RETURN
C**** END OF ARCHEM ****************************************************
END
C***********************************************************************
C $Id: arclus.F,v 0.7 1992/03/13 13:36:14 lonnblad Exp $
SUBROUTINE ARCLUS(NJET)
C...ARiadne subroutine jet CLUStering
C...Clusters particle in the /LUJETS/ common block into jets according
C...the dipole clustering algorithm.
PARAMETER(MAXDIP=500,MAXPAR=500,MAXSTR=100)
IMPLICIT DOUBLE PRECISION (D)
IMPLICIT DOUBLE PRECISION (B)
IMPLICIT LOGICAL (Q)
COMMON /ARDAT1/ PARA(40),MSTA(40)
SAVE /ARDAT1/
COMMON /ARJETX/ N,K(1000,5),P(1000,5),V(1000,5)
SAVE /ARJETX/
COMMON /LUDAT1/ MSTU(200),PARU(200),MSTJ(200),PARJ(200)
SAVE /LUDAT1/
C...Reset error flag.
MSTA(13)=0
C...Copy all particle to be considered as jet-initiators to the end
C...of the event record.
IF(MSTU(48).EQ.0) CALL ARCOPJ
C...The total number of jetinitiators = current number of jets.
NJET=MSTU(3)
I1=0
I3=0
C...Loop over all possible three-jets to find the three jets with
C...smallest invariant p_t^2
100 IF(NJET.LE.MAX(MSTU(47),2)) THEN
CALL ARORDJ
RETURN
ENDIF
J1=0
J2=0
J3=0
PT2MIN=PARA(31)
DO 110 I2=N+1,N+MSTU(3)
IF(K(I2,5).LT.0) GOTO 110
CALL ARUPDJ(I2,I1,I3)
IF(V(I2,5).LT.PT2MIN) THEN
J1=K(I2,3)
J2=I2
J3=K(I2,4)
PT2MIN=V(I2,5)
ENDIF
110 CONTINUE
C...Exit if smallest p_t^2 is above cutoff
IF(J1.EQ.0) THEN
CALL ARORDJ
RETURN
ENDIF
C...Else join the three jets into two and redo the procedure.
CALL ARJOIN(J1,J2,J3)
K(J2,5)=-1
I1=J1
I3=J3
NJET=NJET-1
GOTO 100
C**** END OF ARCLUS ****************************************************
END
C***********************************************************************
C $Id: arcopa.F,v 0.4 1992/03/13 09:02:26 lonnblad Exp $
SUBROUTINE ARCOPA(IJ,IP,ITYP)
C...ARiadne subroutine COpy PArton
C...Copies a parton from position IJ in /LUJETS/ common block to
C...Position IP in /ARPART/ common block.
PARAMETER(MAXDIP=500,MAXPAR=500,MAXSTR=100)
IMPLICIT DOUBLE PRECISION (D)
IMPLICIT DOUBLE PRECISION (B)
IMPLICIT LOGICAL (Q)
COMMON /ARPART/ BP(MAXPAR,5),IFL(MAXPAR),IEX(MAXPAR),QQ(MAXPAR),
$ IDI(MAXPAR),IDO(MAXPAR),INO(MAXPAR),IPART
SAVE /ARPART/
COMMON /ARJETX/ N,K(1000,5),P(1000,5),V(1000,5)
SAVE /ARJETX/
DO 100 I=1,5
BP(IP,I)=P(IJ,I)
100 CONTINUE
IFL(IP)=K(IJ,2)
IEX(IP)=MOD(K(IJ,4),10)
QQ(IP)=(ITYP.NE.2)
INO(IP)=0
RETURN
C**** END OF ARCOPA ****************************************************
END
C***********************************************************************
C $Id: arcopj.F,v 0.6 1992/02/07 16:03:59 lonnblad Exp $
SUBROUTINE ARCOPJ
C...ARiadne subroutine COPy Jet
C...Copies particles into jet initiators in /LUCLUS/
COMMON /ARJETX/ N,K(1000,5),P(1000,5),V(1000,5)
SAVE /ARJETX/
COMMON /LUDAT1/ MSTU(200),PARU(200),MSTJ(200),PARJ(200)
SAVE /LUDAT1/
COMMON /LUDAT2/ KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
SAVE /LUDAT2/
C...Reset jet counter
MSTU(3)=0
C...Loop over all particles in the event record
DO 100 I=1,N
C...Disregard all decayed particles and unknown entries
IF(K(I,1).LE.0.OR.K(I,1).GE.10) GOTO 100
C...Disregard neutrinos and neutral particles according to MSTU(41)
IF(MSTU(41).GE.2) THEN
KC=LUCOMP(K(I,2))
IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.KC.EQ.18)
$ GOTO 100
IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0)
$ GOTO 100
ENDIF
IF(N+MSTU(3)+1.GT.MSTU(4)) THEN
CALL LUERRM(11,'(ARCLUS:) no more memory left in LUJETS')
MSTU(3)=-1
RETURN
ENDIF
C...Tag found jet-initiator
MSTU(3)=MSTU(3)+1
IJ=N+MSTU(3)
DO 200 J=1,5
P(IJ,J)=P(I,J)
200 CONTINUE
K(IJ,1)=31
K(IJ,2)=97
K(IJ,3)=0
K(IJ,4)=0
K(IJ,5)=0
V(IJ,1)=P(I,4)**2-P(I,3)**2-P(I,2)**2-P(I,1)**2
V(IJ,5)=0
100 CONTINUE
RETURN
C**** END OF ARCOPJ ****************************************************
END
C***********************************************************************
C $Id: arcrdi.F,v 0.2 1991/09/26 12:42:05 lonnblad Exp $
SUBROUTINE ARCRDI(ID,IPA1,IPA3,IS,QED)
C...ARiadne subroutine CReate DIpole
C...Creates a dipole from partons IPA1 and IPA3
PARAMETER(MAXDIP=500,MAXPAR=500,MAXSTR=100)
IMPLICIT DOUBLE PRECISION (D)
IMPLICIT DOUBLE PRECISION (B)
IMPLICIT LOGICAL (Q)
COMMON /ARPART/ BP(MAXPAR,5),IFL(MAXPAR),IEX(MAXPAR),QQ(MAXPAR),
$ IDI(MAXPAR),IDO(MAXPAR),INO(MAXPAR),IPART
SAVE /ARPART/
COMMON /ARDIPS/ BX1(MAXDIP),BX3(MAXDIP),PT2IN(MAXDIP),
$ SDIP(MAXDIP),IP1(MAXDIP),IP3(MAXDIP),
$ AEX1(MAXDIP),AEX3(MAXDIP),QDONE(MAXDIP),
$ QEM(MAXDIP),IRAD(MAXDIP),ISTR(MAXDIP),IDIPS
SAVE /ARDIPS/
COMMON /ARSTRS/ IPF(MAXSTR),IPL(MAXSTR),IFLOW(MAXSTR),
$ PT2LST,IMF,IML,IO,QDUMP,ISTRS
SAVE /ARSTRS/
IDO(IPA1)=ID
IDI(IPA3)=ID
IP1(ID)=IPA1
IP3(ID)=IPA3
ISTR(ID)=IS
QDONE(ID)=.FALSE.
QEM(ID)=QED
RETURN
C**** END OF ARCRDI ****************************************************
END
C***********************************************************************
C $Id: ardump.F,v 0.5 1992/02/07 16:01:36 lonnblad Exp $
SUBROUTINE ARDUMP
C...ARiadne subroutine DUMP
C...Dumps the entries in /ARPART/ into /LUJETS/
PARAMETER(MAXDIP=500,MAXPAR=500,MAXSTR=100)
IMPLICIT DOUBLE PRECISION (D)
IMPLICIT DOUBLE PRECISION (B)
IMPLICIT LOGICAL (Q)
COMMON /ARPART/ BP(MAXPAR,5),IFL(MAXPAR),IEX(MAXPAR),QQ(MAXPAR),
$ IDI(MAXPAR),IDO(MAXPAR),INO(MAXPAR),IPART
SAVE /ARPART/
COMMON /ARDIPS/ BX1(MAXDIP),BX3(MAXDIP),PT2IN(MAXDIP),
$ SDIP(MAXDIP),IP1(MAXDIP),IP3(MAXDIP),
$ AEX1(MAXDIP),AEX3(MAXDIP),QDONE(MAXDIP),
$ QEM(MAXDIP),IRAD(MAXDIP),ISTR(MAXDIP),IDIPS
SAVE /ARDIPS/
COMMON /ARSTRS/ IPF(MAXSTR),IPL(MAXSTR),IFLOW(MAXSTR),
$ PT2LST,IMF,IML,IO,QDUMP,ISTRS
SAVE /ARSTRS/
COMMON /ARJETX/ N,K(1000,5),P(1000,5),V(1000,5)
SAVE /ARJETX/
CCPH:..............................................................
COMMON /ARDAT1/ PARA(40),MSTA(40)
SAVE /ARDAT1/
CCPH:^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
INXT(I)=IP3(IDO(I))
C...Tag particles in old string with pointers to cascaded string
DO 100 I=IMF,IML
K(I,1)=K(I,1)+10
K(I,4)=N+1
K(I,5)=N+IPART
100 CONTINUE
C...Loop over all strings in dipole record
DO 200 IS=1,ISTRS
C...Loop over all particles in each string
I=IPF(IS)
210 N=N+1
CCPH:..............................................................
IF(N.GT.1000) THEN
WRITE(MSTA(8),*) '**',N,' Extend ARJETX in Ariadne **'
STOP
ENDIF
CCPH:^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
DO 220 J=1,5
P(N,J)=BP(I,J)
V(N,J)=V(IMF,J)
220 CONTINUE
K(N,2)=IFL(I)
K(N,3)=IMF
K(N,4)=IEX(I)
K(N,5)=INO(I)
IF(I.EQ.IPL(IS)) THEN
K(N,1)=1
ELSE
K(N,1)=2
I=INXT(I)
GOTO 210
ENDIF
200 CONTINUE
C...Set pointers to cascaded string
IMF=N+1-IPART
IML=N
QDUMP=.TRUE.
RETURN
C**** END OF ARDUMP ****************************************************
END
C***********************************************************************
C $Id: arduph.F,v 0.4 1992/02/07 16:00:36 lonnblad Exp $
SUBROUTINE ARDUPH
C...ARiadne subroutine DUmp PHoton
C...Moves photon emitted by Ariadne to /LUJETS/
PARAMETER(MAXDIP=500,MAXPAR=500,MAXSTR=100)
IMPLICIT DOUBLE PRECISION (D)
IMPLICIT DOUBLE PRECISION (B)
IMPLICIT LOGICAL (Q)
COMMON /ARPART/ BP(MAXPAR,5),IFL(MAXPAR),IEX(MAXPAR),QQ(MAXPAR),
$ IDI(MAXPAR),IDO(MAXPAR),INO(MAXPAR),IPART