| 1 | SUBROUTINE RESDEC
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| 2 |
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| 3 | C-----------------------------------------------------------------------
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| 4 | C RES(ONANCE) DEC(AY)
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| 5 | C
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| 6 | C ROUTINE TREATES DECAY OF THE RESONANCES RHO, K*, AND DELTA
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| 7 | C THE DECAY MODE IS SELECTED BY THE RANDOM NUMBER RESRAN, WHICH IS
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| 8 | C SET IN THE ROUTINE HDPM/LEPACX, WHERE THE RESONANCE IS FORMED
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| 9 | C DECAY WITH FULL KINEMATIC, ENERGY AND MOMENTA CONSERVED
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| 10 | C THIS SUBROUTINE IS CALLED FROM BOX3
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| 11 | C-----------------------------------------------------------------------
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| 12 |
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| 13 | IMPLICIT NONE
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| 14 | *KEEP,CONST.
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| 15 | COMMON /CONST/ PI,PI2,OB3,TB3,ENEPER
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| 16 | DOUBLE PRECISION PI,PI2,OB3,TB3,ENEPER
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| 17 | *KEEP,GENER.
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| 18 | COMMON /GENER/ GEN,ALEVEL
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| 19 | DOUBLE PRECISION GEN,ALEVEL
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| 20 | *KEEP,PARPAR.
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| 21 | COMMON /PARPAR/ CURPAR,SECPAR,PRMPAR,OUTPAR,C,
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| 22 | * E00,E00PN,PTOT0,PTOT0N,THICKH,ITYPE,LEVL
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| 23 | DOUBLE PRECISION CURPAR(14),SECPAR(14),PRMPAR(14),OUTPAR(14),
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| 24 | * C(50),E00,E00PN,PTOT0,PTOT0N,THICKH
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| 25 | INTEGER ITYPE,LEVL
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| 26 | *KEEP,PARPAE.
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| 27 | DOUBLE PRECISION GAMMA,COSTHE,PHI,H,T,X,Y,CHI,BETA,GCM,ECM
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| 28 | EQUIVALENCE (CURPAR(2),GAMMA), (CURPAR(3),COSTHE),
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| 29 | * (CURPAR(4), PHI ), (CURPAR(5), H ),
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| 30 | * (CURPAR(6), T ), (CURPAR(7), X ),
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| 31 | * (CURPAR(8), Y ), (CURPAR(9), CHI ),
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| 32 | * (CURPAR(10),BETA), (CURPAR(11),GCM ),
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| 33 | * (CURPAR(12),ECM )
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| 34 | *KEEP,RANDPA.
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| 35 | COMMON /RANDPA/ FAC,U1,U2,RD,NSEQ,ISEED,KNOR
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| 36 | DOUBLE PRECISION FAC,U1,U2
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| 37 | REAL RD(3000)
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| 38 | INTEGER ISEED(103,10),NSEQ
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| 39 | LOGICAL KNOR
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| 40 | *KEEP,RESON.
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| 41 | COMMON /RESON/ RDRES,RESRAN,IRESPAR
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| 42 | REAL RDRES(2),RESRAN(1000)
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| 43 | INTEGER IRESPAR
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| 44 |
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| 45 | *KEEP,RUNPAR.
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| 46 | COMMON /RUNPAR/ FIXHEI,THICK0,HILOECM,HILOELB,
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| 47 | * STEPFC,NRRUN,NSHOW,PATAPE,MONIIN,
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| 48 | * MONIOU,MDEBUG,NUCNUC,
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| 49 | * CETAPE,
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| 50 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 51 | * N1STTR,MDBASE,
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| 52 | * DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 53 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 54 | * ,GHEISH,GHESIG
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| 55 | COMMON /RUNPAC/ DSN,HOST,USER
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| 56 | DOUBLE PRECISION FIXHEI,THICK0,HILOECM,HILOELB
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| 57 | REAL STEPFC
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| 58 | INTEGER NRRUN,NSHOW,PATAPE,MONIIN,MONIOU,MDEBUG,NUCNUC,
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| 59 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 60 | * N1STTR,MDBASE
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| 61 | INTEGER CETAPE
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| 62 | CHARACTER*79 DSN
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| 63 | CHARACTER*20 HOST,USER
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| 64 |
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| 65 | LOGICAL DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 66 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 67 | * ,GHEISH,GHESIG
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| 68 | *KEND.
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| 69 |
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| 70 | INTEGER I,KK,M3,M4
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| 71 | C-----------------------------------------------------------------------
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| 72 |
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| 73 | IF ( DEBUG ) WRITE(MDEBUG,444) (CURPAR(I),I=1,8)
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| 74 | 444 FORMAT(' RESDEC: CURPAR=',1P,8E10.3)
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| 75 |
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| 76 | C CURRENT PARTICLE MUST BE SAVED IN STORE
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| 77 | DO 141 KK = 5,8
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| 78 | SECPAR(KK) = CURPAR(KK)
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| 79 | 141 CONTINUE
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| 80 | SECPAR( 9) = GEN
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| 81 | SECPAR(10) = ALEVEL
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| 82 |
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| 83 | BETA = SQRT( GAMMA**2 - 1.D0 ) / GAMMA
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| 84 |
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| 85 | IF ( IRESPAR .LE. 0 ) THEN
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| 86 | WRITE(MONIOU,*)'RESDEC: IRESPAR .LE. 0, CORRECTED'
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| 87 | IRESPAR = 1
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| 88 | ENDIF
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| 89 | C-----------------------------------------------------------------------
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| 90 | C TREAT FIRST NUCLEON RESONANCES, AS MOST FREQUENT
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| 91 |
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| 92 | IF ( ITYPE .EQ. 54 ) THEN
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| 93 | C DECAY DELTA(++) ----> P + PI(+)
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| 94 | CALL DECAY1( ITYPE, 14, 8 )
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| 95 |
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| 96 | ELSEIF ( ITYPE .EQ. 55 .OR. ITYPE .EQ. 56 ) THEN
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| 97 | C DECAY DELTA(+) OR DECAY DELTA(0)
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| 98 |
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| 99 | IF ( RESRAN(IRESPAR) .LE. TB3 ) THEN
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| 100 | C DECAY DELTA(+) ----> P + PI(0)
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| 101 | C DECAY DELTA(0) ----> N + PI(0)
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| 102 | M3 = 69 - ITYPE
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| 103 | CALL DECAY1( ITYPE, M3, 7 )
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| 104 |
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| 105 | ELSE
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| 106 | C DECAY DELTA(+) ----> N + PI(+)
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| 107 | C DECAY DELTA(0) ----> P + PI(-)
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| 108 | M3 = ITYPE - 42
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| 109 | M4 = M3 - 5
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| 110 | CALL DECAY1( ITYPE, M3, M4 )
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| 111 | ENDIF
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| 112 |
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| 113 | ELSEIF ( ITYPE .EQ. 57 ) THEN
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| 114 | C DECAY DELTA(-) ----> N + PI(-)
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| 115 | CALL DECAY1( ITYPE, 13, 9 )
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| 116 |
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| 117 | C-----------------------------------------------------------------------
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| 118 | C RHO RESONANCES
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| 119 |
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| 120 | ELSEIF ( ITYPE .EQ. 51 ) THEN
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| 121 | C DECAY RHO(0) ----> PI(+) + PI(-)
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| 122 | CALL DECAY1( ITYPE, 8, 9 )
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| 123 |
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| 124 | ELSEIF ( ITYPE .EQ. 52 .OR. ITYPE .EQ. 53 ) THEN
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| 125 | C DECAY RHO(+,-) ----> PI(+,-) + PI(0)
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| 126 | M3 = ITYPE - 44
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| 127 | CALL DECAY1( ITYPE, M3, 7 )
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| 128 |
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| 129 | C-----------------------------------------------------------------------
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| 130 | C EXCITED KAON RESONANCES
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| 131 |
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| 132 | ELSEIF ( ITYPE .EQ. 62 ) THEN
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| 133 | C DECAY K*(0) ----> 2/3: K(+) + PI(-)
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| 134 | C ----> 1/3: K0(L,S) + PI(0)
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| 135 | IF ( RESRAN(IRESPAR) .LE. TB3 ) THEN
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| 136 | CALL DECAY1( ITYPE, 11, 9 )
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| 137 | ELSEIF ( RESRAN(IRESPAR) .LE. .8333333 ) THEN
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| 138 | CALL DECAY1( ITYPE, 10, 7 )
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| 139 | ELSE
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| 140 | CALL DECAY1( ITYPE, 16, 7 )
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| 141 | ENDIF
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| 142 |
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| 143 | ELSEIF ( ITYPE .EQ. 65 ) THEN
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| 144 | C DECAY ANTI-K*(0) ----> 2/3: K(-) + PI(+)
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| 145 | C ----> 1/3: K0(L,S) + PI(0)
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| 146 | IF ( RESRAN(IRESPAR) .LE. TB3 ) THEN
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| 147 | CALL DECAY1( ITYPE, 12, 8 )
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| 148 | ELSEIF ( RESRAN(IRESPAR) .LE. .8333333 ) THEN
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| 149 | CALL DECAY1( ITYPE, 10, 7 )
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| 150 | ELSE
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| 151 | CALL DECAY1( ITYPE, 16, 7 )
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| 152 | ENDIF
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| 153 |
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| 154 | ELSEIF ( ITYPE .EQ. 63 .OR. ITYPE .EQ. 64 ) THEN
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| 155 | C DECAY K*(+-) ----> 2/3: K(+-) + PI(0)
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| 156 | C ----> 1/3: K0(L,S) + PI(+-)
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| 157 | IF ( RESRAN(IRESPAR) .LE. TB3 ) THEN
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| 158 | CALL DECAY1( ITYPE, ITYPE-52, 7 )
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| 159 | ELSEIF ( RESRAN(IRESPAR) .LE. .8333333 ) THEN
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| 160 | CALL DECAY1( ITYPE, 10, ITYPE-55 )
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| 161 | ELSE
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| 162 | CALL DECAY1( ITYPE, 16, ITYPE-55 )
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| 163 | ENDIF
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| 164 |
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| 165 | C-----------------------------------------------------------------------
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| 166 | C ANTI-NUCLEON RESONANCES
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| 167 |
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| 168 | ELSEIF ( ITYPE .EQ. 58 ) THEN
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| 169 | C DECAY ANTI-DELTA(--) ----> ANTI-P + PI(-)
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| 170 | CALL DECAY1( ITYPE, 15, 9 )
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| 171 |
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| 172 | ELSEIF ( ITYPE .EQ. 59 .OR. ITYPE .EQ. 60 ) THEN
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| 173 | C DECAY ANTI-DELTA(-) OR DECAY ANTI-DELTA(0)
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| 174 |
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| 175 | IF ( RESRAN(IRESPAR) .LE. TB3 ) THEN
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| 176 | C DECAY ANTI-DELTA(-) ----> ANTI-P + PI(0)
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| 177 | C DECAY ANTI-DELTA(0) ----> ANTI-N + PI(0)
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| 178 | M3 = 15 + (ITYPE - 59) * 10
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| 179 | CALL DECAY1( ITYPE, M3, 7 )
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| 180 |
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| 181 | ELSE
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| 182 | C DECAY ANTI-DELTA(-) ----> ANTI-N + PI(-)
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| 183 | C DECAY ANTI-DELTA(0) ----> ANTI-P + PI(+)
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| 184 | M3 = 15 + (60 - ITYPE) * 10
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| 185 | M4 = 68 - ITYPE
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| 186 | CALL DECAY1( ITYPE, M3, M4 )
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| 187 | ENDIF
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| 188 |
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| 189 | ELSEIF ( ITYPE .EQ. 61 ) THEN
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| 190 | C DECAY ANTI-DELTA(+) ----> ANTI-N + PI(+)
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| 191 | CALL DECAY1( ITYPE, 25, 8 )
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| 192 |
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| 193 | C-----------------------------------------------------------------------
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| 194 | ELSE
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| 195 | WRITE(MONIOU,*) 'RESDEC: UNFORESEEN PARTICLE CODE =',ITYPE
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| 196 | ENDIF
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| 197 | IRESPAR = IRESPAR -1
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| 198 |
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| 199 | RETURN
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| 200 | END
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