| 1 | SUBROUTINE DECAY1( M0,M3,M4 )
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| 2 |
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| 3 | C-----------------------------------------------------------------------
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| 4 | C DECAY (INTO TWO PARTICLES)
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| 5 | C
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| 6 | C TWO PARTICLE DECAY WITH FULL KINEMATIC; ENERGY AND MOMENTA CONSERVED
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| 7 | C THIS SUBROUTINE IS CALLED FROM KDECAY, RESDEC, AND STRDEC
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| 8 | C ARGUMENTS:
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| 9 | C M0 = TYPE OF DECAYING PARTICLE
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| 10 | C M3 = TYPE OF FIRST PRODUCT PARTICLE
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| 11 | C M4 = TYPE OF SECOND PRODUCT PARTICLE
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| 12 | C
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| 13 | C DESIGN : D. HECK IK3 FZK KARLSRUHE
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| 14 | C-----------------------------------------------------------------------
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| 15 |
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| 16 | IMPLICIT NONE
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| 17 | *KEEP,CONST.
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| 18 | COMMON /CONST/ PI,PI2,OB3,TB3,ENEPER
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| 19 | DOUBLE PRECISION PI,PI2,OB3,TB3,ENEPER
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| 20 | *KEEP,PAM.
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| 21 | COMMON /PAM/ PAMA,SIGNUM
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| 22 | DOUBLE PRECISION PAMA(6000),SIGNUM(6000)
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| 23 | *KEEP,PARPAR.
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| 24 | COMMON /PARPAR/ CURPAR,SECPAR,PRMPAR,OUTPAR,C,
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| 25 | * E00,E00PN,PTOT0,PTOT0N,THICKH,ITYPE,LEVL
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| 26 | DOUBLE PRECISION CURPAR(14),SECPAR(14),PRMPAR(14),OUTPAR(14),
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| 27 | * C(50),E00,E00PN,PTOT0,PTOT0N,THICKH
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| 28 | INTEGER ITYPE,LEVL
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| 29 | *KEEP,PARPAE.
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| 30 | DOUBLE PRECISION GAMMA,COSTHE,PHI,H,T,X,Y,CHI,BETA,GCM,ECM
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| 31 | EQUIVALENCE (CURPAR(2),GAMMA), (CURPAR(3),COSTHE),
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| 32 | * (CURPAR(4), PHI ), (CURPAR(5), H ),
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| 33 | * (CURPAR(6), T ), (CURPAR(7), X ),
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| 34 | * (CURPAR(8), Y ), (CURPAR(9), CHI ),
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| 35 | * (CURPAR(10),BETA), (CURPAR(11),GCM ),
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| 36 | * (CURPAR(12),ECM )
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| 37 | *KEEP,RANDPA.
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| 38 | COMMON /RANDPA/ FAC,U1,U2,RD,NSEQ,ISEED,KNOR
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| 39 | DOUBLE PRECISION FAC,U1,U2
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| 40 | REAL RD(3000)
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| 41 | INTEGER ISEED(103,10),NSEQ
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| 42 | LOGICAL KNOR
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| 43 | *KEEP,RUNPAR.
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| 44 | COMMON /RUNPAR/ FIXHEI,THICK0,HILOECM,HILOELB,
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| 45 | * STEPFC,NRRUN,NSHOW,PATAPE,MONIIN,
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| 46 | * MONIOU,MDEBUG,NUCNUC,
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| 47 | * CETAPE,
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| 48 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 49 | * N1STTR,MDBASE,
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| 50 | * DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 51 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 52 | * ,GHEISH,GHESIG
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| 53 | COMMON /RUNPAC/ DSN,HOST,USER
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| 54 | DOUBLE PRECISION FIXHEI,THICK0,HILOECM,HILOELB
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| 55 | REAL STEPFC
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| 56 | INTEGER NRRUN,NSHOW,PATAPE,MONIIN,MONIOU,MDEBUG,NUCNUC,
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| 57 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 58 | * N1STTR,MDBASE
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| 59 | INTEGER CETAPE
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| 60 | CHARACTER*79 DSN
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| 61 | CHARACTER*20 HOST,USER
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| 62 |
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| 63 | LOGICAL DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 64 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 65 | * ,GHEISH,GHESIG
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| 66 | *KEND.
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| 67 |
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| 68 | DOUBLE PRECISION AUX1,AUX2,AUX2A,AUX3,AUX4,COSTCM,COSTH3,COSTH4,
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| 69 | * GAMMA3,GAMMA4,PHI4,WORK1,WORK2
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| 70 | INTEGER I,M0,M3,M4
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| 71 | C-----------------------------------------------------------------------
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| 72 |
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| 73 | IF ( DEBUG ) WRITE(MDEBUG,444) BETA,M0,M3,M4
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| 74 | 444 FORMAT(' DECAY1: BETA,M0,M3,M4=',1P,E10.3,3I5)
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| 75 |
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| 76 | C PARTICLE COORDINATES 5..10 ARE COPIED INTO SECPAR IN CALLING PROGRAM
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| 77 | C CALCULATE AUXILIARY QUANTITIES
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| 78 | AUX1 = ( ( PAMA(M0)**2 + PAMA(M3)**2 - PAMA(M4)**2 )
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| 79 | * / (2.D0*PAMA(M0)) )**2 - PAMA(M3)**2
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| 80 | AUX2 = 1.D0 + AUX1 / PAMA(M3)**2
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| 81 | AUX2A = SQRT(AUX2)
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| 82 | AUX3 = SQRT( 1.D0 - 1.D0 / AUX2 )
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| 83 |
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| 84 | WORK1 = GAMMA * AUX2A
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| 85 | WORK2 = AUX3 * BETA * WORK1
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| 86 |
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| 87 | C DETERMINE POLAR ANGLE IN CM SYSTEM
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| 88 | CALL RMMAR( RD,2,1 )
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| 89 | COSTCM = 2.D0 * RD(1) - 1.D0
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| 90 | GAMMA3 = WORK1 + WORK2 * COSTCM
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| 91 | C SECOND PRODUCT PARTICLE WITH NONVANISHING REST MASS
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| 92 | IF ( PAMA(M4) .NE. 0.D0 ) THEN
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| 93 | GAMMA4 = (PAMA(M0)*GAMMA - PAMA(M3)*GAMMA3) / PAMA(M4)
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| 94 | AUX4 = (PAMA(M0)**2 + PAMA(M4)**2 - PAMA(M3)**2 )
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| 95 | * / (2.D0*PAMA(M0)*PAMA(M4))
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| 96 | COSTH4 = MIN( 1.D0, (GAMMA*GAMMA4 - AUX4)
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| 97 | * / (BETA * GAMMA * SQRT(GAMMA4**2 - 1.D0)) )
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| 98 | ELSE
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| 99 | C SECOND PRODUCT PARTICLE IS GAMMA; THEN GAMMA4 IS THE ENERGY
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| 100 | GAMMA4 = PAMA(M0)*GAMMA - PAMA(M3)*GAMMA3
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| 101 | COSTH4 = MIN( 1.D0, (BETA - COSTCM)/(1.D0 - BETA*COSTCM) )
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| 102 | ENDIF
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| 103 | PHI4 = RD(2)*PI2
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| 104 | CALL ADDANG( COSTHE,PHI, COSTH4,PHI4, SECPAR(3),SECPAR(4) )
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| 105 | IF ( SECPAR(3) .GT. C(29) ) THEN
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| 106 | SECPAR(1) = M4
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| 107 | SECPAR(2) = GAMMA4
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| 108 | IF ( DEBUG ) WRITE(MDEBUG,445) (SECPAR(I),I=1,9)
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| 109 | 445 FORMAT(' DECAY1: SECPAR=',1P,9E10.3)
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| 110 | CALL TSTACK
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| 111 | ENDIF
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| 112 | C FIRST PRODUCT PARTICLE
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| 113 | COSTH3 = MIN( 1.D0, (GAMMA * GAMMA3 - AUX2A)
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| 114 | * / (BETA * GAMMA * SQRT(GAMMA3**2 - 1.D0)) )
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| 115 | CALL ADDANG( COSTHE,PHI, COSTH3,PHI4+PI, SECPAR(3),SECPAR(4) )
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| 116 | IF ( SECPAR(3) .GT. C(29) ) THEN
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| 117 | SECPAR(1) = M3
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| 118 | SECPAR(2) = GAMMA3
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| 119 | IF ( DEBUG ) WRITE(MDEBUG,445) (SECPAR(I),I=1,9)
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| 120 | CALL TSTACK
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| 121 | ENDIF
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| 122 |
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| 123 | RETURN
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| 124 | END
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