--- /dev/null
+
+C*********************************************************************
+
+ SUBROUTINE PYINBM(CHFRAM,CHBEAM,CHTARG,WIN)
+
+C...Identifies the two incoming particles and the choice of frame.
+ COMMON/LUJETS/N,K(4000,5),P(4000,5),V(4000,5)
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200)
+ COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200)
+ COMMON/PYINT1/MINT(400),VINT(400)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+ SAVE /PYSUBS/,/PYPARS/,/PYINT1/
+ CHARACTER CHFRAM*8,CHBEAM*8,CHTARG*8,CHCOM(3)*8,CHALP(2)*26,
+ &CHIDNT(3)*8,CHTEMP*8,CHCDE(29)*8,CHINIT*76
+ DIMENSION LEN(3),KCDE(29),PM(2)
+ DATA CHALP/'abcdefghijklmnopqrstuvwxyz',
+ &'ABCDEFGHIJKLMNOPQRSTUVWXYZ'/
+ DATA CHCDE/'e- ','e+ ','nu_e ','nu_e~ ',
+ &'mu- ','mu+ ','nu_mu ','nu_mu~ ','tau- ',
+ &'tau+ ','nu_tau ','nu_tau~ ','pi+ ','pi- ',
+ &'n0 ','n~0 ','p+ ','p~- ','gamma ',
+ &'lambda0 ','sigma- ','sigma0 ','sigma+ ','xi- ',
+ &'xi0 ','omega- ','pi0 ','reggeon ','pomeron '/
+ DATA KCDE/11,-11,12,-12,13,-13,14,-14,15,-15,16,-16,
+ &211,-211,2112,-2112,2212,-2212,22,3122,3112,3212,3222,
+ &3312,3322,3334,111,28,29/
+
+C...Store initial energy. Default frame.
+ VINT(290)=WIN
+ MINT(111)=0
+
+C...Convert character variables to lowercase and find their length.
+ CHCOM(1)=CHFRAM
+ CHCOM(2)=CHBEAM
+ CHCOM(3)=CHTARG
+ DO 130 I=1,3
+ LEN(I)=8
+ DO 110 LL=8,1,-1
+ IF(LEN(I).EQ.LL.AND.CHCOM(I)(LL:LL).EQ.' ') LEN(I)=LL-1
+ DO 100 LA=1,26
+ IF(CHCOM(I)(LL:LL).EQ.CHALP(2)(LA:LA)) CHCOM(I)(LL:LL)=
+ &CHALP(1)(LA:LA)
+ 100 CONTINUE
+ 110 CONTINUE
+ CHIDNT(I)=CHCOM(I)
+
+C...Fix up bar, underscore and charge in particle name (if needed).
+ DO 120 LL=1,6
+ IF(CHIDNT(I)(LL:LL+2).EQ.'bar') THEN
+ CHTEMP=CHIDNT(I)
+ CHIDNT(I)=CHTEMP(1:LL-1)//'~'//CHTEMP(LL+3:8)//' '
+ ENDIF
+ 120 CONTINUE
+ IF(CHIDNT(I)(1:2).EQ.'nu'.AND.CHIDNT(I)(3:3).NE.'_') THEN
+ CHTEMP=CHIDNT(I)
+ CHIDNT(I)='nu_'//CHTEMP(3:7)
+ ELSEIF(CHIDNT(I)(1:2).EQ.'n ') THEN
+ CHIDNT(I)(1:3)='n0 '
+ ELSEIF(CHIDNT(I)(1:2).EQ.'n~') THEN
+ CHIDNT(I)(1:3)='n~0'
+ ELSEIF(CHIDNT(I)(1:2).EQ.'p ') THEN
+ CHIDNT(I)(1:3)='p+ '
+ ELSEIF(CHIDNT(I)(1:2).EQ.'p~'.OR.CHIDNT(I)(1:2).EQ.'p-') THEN
+ CHIDNT(I)(1:3)='p~-'
+ ELSEIF(CHIDNT(I)(1:6).EQ.'lambda') THEN
+ CHIDNT(I)(7:7)='0'
+ ELSEIF(CHIDNT(I)(1:3).EQ.'reg') THEN
+ CHIDNT(I)(1:7)='reggeon'
+ ELSEIF(CHIDNT(I)(1:3).EQ.'pom') THEN
+ CHIDNT(I)(1:7)='pomeron'
+ ENDIF
+ 130 CONTINUE
+
+C...Identify free initialization.
+ IF(CHCOM(1)(1:2).EQ.'no') THEN
+ MINT(65)=1
+ RETURN
+ ENDIF
+
+C...Identify incoming beam and target particles.
+ DO 150 I=1,2
+ DO 140 J=1,29
+ IF(CHIDNT(I+1).EQ.CHCDE(J)) MINT(10+I)=KCDE(J)
+ 140 CONTINUE
+ PM(I)=ULMASS(MINT(10+I))
+ VINT(2+I)=PM(I)
+ 150 CONTINUE
+ IF(MINT(11).EQ.0) WRITE(MSTU(11),5000) CHBEAM(1:LEN(2))
+ IF(MINT(12).EQ.0) WRITE(MSTU(11),5100) CHTARG(1:LEN(3))
+ IF(MINT(11).EQ.0.OR.MINT(12).EQ.0) STOP
+
+C...Identify choice of frame and input energies.
+ CHINIT=' '
+
+C...Events defined in the CM frame.
+ IF(CHCOM(1)(1:2).EQ.'cm') THEN
+ MINT(111)=1
+ S=WIN**2
+ IF(MSTP(122).GE.1) THEN
+ IF(CHCOM(2)(1:1).NE.'e') THEN
+ LOFFS=(31-(LEN(2)+LEN(3)))/2
+ CHINIT(LOFFS+1:76)='PYTHIA will be initialized for a '//
+ & CHCOM(2)(1:LEN(2))//' on '//CHCOM(3)(1:LEN(3))//
+ & ' collider'//' '
+ ELSE
+ LOFFS=(30-(LEN(2)+LEN(3)))/2
+ CHINIT(LOFFS+1:76)='PYTHIA will be initialized for an '//
+ & CHCOM(2)(1:LEN(2))//' on '//CHCOM(3)(1:LEN(3))//
+ & ' collider'//' '
+ ENDIF
+ WRITE(MSTU(11),5200) CHINIT
+ WRITE(MSTU(11),5300) WIN
+ ENDIF
+
+C...Events defined in fixed target frame.
+ ELSEIF(CHCOM(1)(1:3).EQ.'fix') THEN
+ MINT(111)=2
+ S=PM(1)**2+PM(2)**2+2.*PM(2)*SQRT(PM(1)**2+WIN**2)
+ IF(MSTP(122).GE.1) THEN
+ LOFFS=(29-(LEN(2)+LEN(3)))/2
+ CHINIT(LOFFS+1:76)='PYTHIA will be initialized for '//
+ & CHCOM(2)(1:LEN(2))//' on '//CHCOM(3)(1:LEN(3))//
+ & ' fixed target'//' '
+ WRITE(MSTU(11),5200) CHINIT
+ WRITE(MSTU(11),5400) WIN
+ WRITE(MSTU(11),5500) SQRT(S)
+ ENDIF
+
+C...Frame defined by user three-vectors.
+ ELSEIF(CHCOM(1)(1:3).EQ.'use') THEN
+ MINT(111)=3
+ P(1,5)=PM(1)
+ P(2,5)=PM(2)
+ P(1,4)=SQRT(P(1,1)**2+P(1,2)**2+P(1,3)**2+P(1,5)**2)
+ P(2,4)=SQRT(P(2,1)**2+P(2,2)**2+P(2,3)**2+P(2,5)**2)
+ S=(P(1,4)+P(2,4))**2-(P(1,1)+P(2,1))**2-(P(1,2)+P(2,2))**2-
+ & (P(1,3)+P(2,3))**2
+ IF(MSTP(122).GE.1) THEN
+ LOFFS=(12-(LEN(2)+LEN(3)))/2
+ CHINIT(LOFFS+1:76)='PYTHIA will be initialized for '//
+ & CHCOM(2)(1:LEN(2))//' on '//CHCOM(3)(1:LEN(3))//
+ & ' user-specified configuration'//' '
+ WRITE(MSTU(11),5200) CHINIT
+ WRITE(MSTU(11),5600)
+ WRITE(MSTU(11),5700) CHCOM(2),P(1,1),P(1,2),P(1,3),P(1,4)
+ WRITE(MSTU(11),5700) CHCOM(3),P(2,1),P(2,2),P(2,3),P(2,4)
+ WRITE(MSTU(11),5500) SQRT(MAX(0.,S))
+ ENDIF
+
+C...Frame defined by user four-vectors.
+ ELSEIF(CHCOM(1)(1:4).EQ.'four') THEN
+ MINT(111)=4
+ PMS1=P(1,4)**2-P(1,1)**2-P(1,2)**2-P(1,3)**2
+ P(1,5)=SIGN(SQRT(ABS(PMS1)),PMS1)
+ PMS2=P(2,4)**2-P(2,1)**2-P(2,2)**2-P(2,3)**2
+ P(2,5)=SIGN(SQRT(ABS(PMS2)),PMS2)
+ S=(P(1,4)+P(2,4))**2-(P(1,1)+P(2,1))**2-(P(1,2)+P(2,2))**2-
+ & (P(1,3)+P(2,3))**2
+ IF(MSTP(122).GE.1) THEN
+ LOFFS=(12-(LEN(2)+LEN(3)))/2
+ CHINIT(LOFFS+1:76)='PYTHIA will be initialized for '//
+ & CHCOM(2)(1:LEN(2))//' on '//CHCOM(3)(1:LEN(3))//
+ & ' user-specified configuration'//' '
+ WRITE(MSTU(11),5200) CHINIT
+ WRITE(MSTU(11),5600)
+ WRITE(MSTU(11),5700) CHCOM(2),P(1,1),P(1,2),P(1,3),P(1,4)
+ WRITE(MSTU(11),5700) CHCOM(3),P(2,1),P(2,2),P(2,3),P(2,4)
+ WRITE(MSTU(11),5500) SQRT(MAX(0.,S))
+ ENDIF
+
+C...Frame defined by user five-vectors.
+ ELSEIF(CHCOM(1)(1:4).EQ.'five') THEN
+ MINT(111)=5
+ S=(P(1,4)+P(2,4))**2-(P(1,1)+P(2,1))**2-(P(1,2)+P(2,2))**2-
+ & (P(1,3)+P(2,3))**2
+ IF(MSTP(122).GE.1) THEN
+ LOFFS=(12-(LEN(2)+LEN(3)))/2
+ CHINIT(LOFFS+1:76)='PYTHIA will be initialized for '//
+ & CHCOM(2)(1:LEN(2))//' on '//CHCOM(3)(1:LEN(3))//
+ & ' user-specified configuration'//' '
+ WRITE(MSTU(11),5200) CHINIT
+ WRITE(MSTU(11),5600)
+ WRITE(MSTU(11),5700) CHCOM(2),P(1,1),P(1,2),P(1,3),P(1,4)
+ WRITE(MSTU(11),5700) CHCOM(3),P(2,1),P(2,2),P(2,3),P(2,4)
+ WRITE(MSTU(11),5500) SQRT(MAX(0.,S))
+ ENDIF
+
+C...Unknown frame. Error for too low CM energy.
+ ELSE
+ WRITE(MSTU(11),5800) CHFRAM(1:LEN(1))
+ STOP
+ ENDIF
+ IF(S.LT.PARP(2)**2) THEN
+ WRITE(MSTU(11),5900) SQRT(S)
+ STOP
+ ENDIF
+
+C...Formats for initialization and error information.
+ 5000 FORMAT(1X,'Error: unrecognized beam particle ''',A,'''.'/
+ &1X,'Execution stopped!')
+ 5100 FORMAT(1X,'Error: unrecognized target particle ''',A,'''.'/
+ &1X,'Execution stopped!')
+ 5200 FORMAT(/1X,78('=')/1X,'I',76X,'I'/1X,'I',A76,'I')
+ 5300 FORMAT(1X,'I',18X,'at',1X,F10.3,1X,'GeV center-of-mass energy',
+ &19X,'I'/1X,'I',76X,'I'/1X,78('='))
+ 5400 FORMAT(1X,'I',22X,'at',1X,F10.3,1X,'GeV/c lab-momentum',22X,'I')
+ 5500 FORMAT(1X,'I',76X,'I'/1X,'I',11X,'corresponding to',1X,F10.3,1X,
+ &'GeV center-of-mass energy',12X,'I'/1X,'I',76X,'I'/1X,78('='))
+ 5600 FORMAT(1X,'I',76X,'I'/1X,'I',18X,'px (GeV/c)',3X,'py (GeV/c)',3X,
+ &'pz (GeV/c)',6X,'E (GeV)',9X,'I')
+ 5700 FORMAT(1X,'I',8X,A8,4(2X,F10.3,1X),8X,'I')
+ 5800 FORMAT(1X,'Error: unrecognized coordinate frame ''',A,'''.'/
+ &1X,'Execution stopped!')
+ 5900 FORMAT(1X,'Error: too low CM energy,',F8.3,' GeV for event ',
+ &'generation.'/1X,'Execution stopped!')
+
+ RETURN
+ END
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff