| 1 | DOUBLE PRECISION FUNCTION PTRANS( DUMMY )
|
|---|
| 2 |
|
|---|
| 3 | C-----------------------------------------------------------------------
|
|---|
| 4 | C TRANS(VERSE MOMENTUM)
|
|---|
| 5 | C
|
|---|
| 6 | C RANDOM SELECTION OF TRANSVERSE MOMENTUM
|
|---|
| 7 | C DISTRIBUTION IS OF FORM X*EXP(-X)
|
|---|
| 8 | C THIS FUNCTION IS CALLED FROM BOX60, BOX65, BOX70, HMESON, ISOBAR,
|
|---|
| 9 | C NIHILA, PIGEN1, PIGEN2, SINGLE, AND VHMESO
|
|---|
| 10 | C ARGUMENT:
|
|---|
| 11 | C DUMMY = DUMMY (FOR HISTORICAL REASONS)
|
|---|
| 12 | C
|
|---|
| 13 | C CHANGES : J. KNAPP IK1 FZK KARLSRUHE
|
|---|
| 14 | C-----------------------------------------------------------------------
|
|---|
| 15 |
|
|---|
| 16 | IMPLICIT DOUBLE PRECISION (A-H,O-Z)
|
|---|
| 17 | *KEEP,PARPAR.
|
|---|
| 18 | COMMON /PARPAR/ CURPAR,SECPAR,PRMPAR,OUTPAR,C,
|
|---|
| 19 | * E00,E00PN,PTOT0,PTOT0N,THICKH,ITYPE,LEVL
|
|---|
| 20 | DOUBLE PRECISION CURPAR(14),SECPAR(14),PRMPAR(14),OUTPAR(14),
|
|---|
| 21 | * C(50),E00,E00PN,PTOT0,PTOT0N,THICKH
|
|---|
| 22 | INTEGER ITYPE,LEVL
|
|---|
| 23 | *KEEP,PARPAE.
|
|---|
| 24 | DOUBLE PRECISION GAMMA,COSTHE,PHI,H,T,X,Y,CHI,BETA,GCM,ECM
|
|---|
| 25 | EQUIVALENCE (CURPAR(2),GAMMA), (CURPAR(3),COSTHE),
|
|---|
| 26 | * (CURPAR(4), PHI ), (CURPAR(5), H ),
|
|---|
| 27 | * (CURPAR(6), T ), (CURPAR(7), X ),
|
|---|
| 28 | * (CURPAR(8), Y ), (CURPAR(9), CHI ),
|
|---|
| 29 | * (CURPAR(10),BETA), (CURPAR(11),GCM ),
|
|---|
| 30 | * (CURPAR(12),ECM )
|
|---|
| 31 | *KEEP,RANDPA.
|
|---|
| 32 | COMMON /RANDPA/ FAC,U1,U2,RD,NSEQ,ISEED,KNOR
|
|---|
| 33 | DOUBLE PRECISION FAC,U1,U2
|
|---|
| 34 | REAL RD(3000)
|
|---|
| 35 | INTEGER ISEED(103,10),NSEQ
|
|---|
| 36 | LOGICAL KNOR
|
|---|
| 37 | *KEEP,RUNPAR.
|
|---|
| 38 | COMMON /RUNPAR/ FIXHEI,THICK0,HILOECM,HILOELB,
|
|---|
| 39 | * STEPFC,NRRUN,NSHOW,PATAPE,MONIIN,
|
|---|
| 40 | * MONIOU,MDEBUG,NUCNUC,
|
|---|
| 41 | * CETAPE,
|
|---|
| 42 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
|
|---|
| 43 | * N1STTR,MDBASE,
|
|---|
| 44 | * DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
|
|---|
| 45 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
|
|---|
| 46 | * ,GHEISH,GHESIG
|
|---|
| 47 | COMMON /RUNPAC/ DSN,HOST,USER
|
|---|
| 48 | DOUBLE PRECISION FIXHEI,THICK0,HILOECM,HILOELB
|
|---|
| 49 | REAL STEPFC
|
|---|
| 50 | INTEGER NRRUN,NSHOW,PATAPE,MONIIN,MONIOU,MDEBUG,NUCNUC,
|
|---|
| 51 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
|
|---|
| 52 | * N1STTR,MDBASE
|
|---|
| 53 | INTEGER CETAPE
|
|---|
| 54 | CHARACTER*79 DSN
|
|---|
| 55 | CHARACTER*20 HOST,USER
|
|---|
| 56 |
|
|---|
| 57 | LOGICAL DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
|
|---|
| 58 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
|
|---|
| 59 | * ,GHEISH,GHESIG
|
|---|
| 60 | *KEND.
|
|---|
| 61 |
|
|---|
| 62 | REAL GX(0:50),HX(0:50)
|
|---|
| 63 | SAVE GX,HX,DX,FIRST
|
|---|
| 64 | LOGICAL FIRST
|
|---|
| 65 | C DX IS STEPSIZE FOR APPROXIMATING CURVE
|
|---|
| 66 | DATA FIRST / .TRUE. /, DX / 0.5D0 /
|
|---|
| 67 | C-----------------------------------------------------------------------
|
|---|
| 68 |
|
|---|
| 69 | C IF ( DEBUG ) WRITE(MDEBUG,*) 'PTRANS:'
|
|---|
| 70 |
|
|---|
| 71 | C COMPUTE FUNCTION VALUES AND INTEGRAL OF STEP FUNCTION H(X)
|
|---|
| 72 | C APPROXIMATING Y(X) = X * EXP(1-X) WITH H(X) > Y(X)
|
|---|
| 73 | IF ( FIRST ) THEN
|
|---|
| 74 | FIRST = .FALSE.
|
|---|
| 75 | IMAX = C(34) / DX
|
|---|
| 76 | GX(0) = 0.D0
|
|---|
| 77 | HX(0) = DX*EXP(1.D0-DX)
|
|---|
| 78 | DO 2 I = 1,IMAX
|
|---|
| 79 | X = I*DX
|
|---|
| 80 | IF ( X .LT. 1.D0 ) X = X + DX
|
|---|
| 81 | HX(I) = X*EXP(1.D0-X)
|
|---|
| 82 | GX(I) = GX(I-1) + HX(I-1)
|
|---|
| 83 | 2 CONTINUE
|
|---|
| 84 | SUMI = 1.D0 / GX(IMAX)
|
|---|
| 85 | DO 3 I = 1,IMAX
|
|---|
| 86 | GX(I) = GX(I) * SUMI
|
|---|
| 87 | 3 CONTINUE
|
|---|
| 88 | ENDIF
|
|---|
| 89 |
|
|---|
| 90 | C-----------------------------------------------------------------------
|
|---|
| 91 | C GET RANDOM VARIABLE DISTRIBUTED AS HX(X)
|
|---|
| 92 | 11 CONTINUE
|
|---|
| 93 | CALL RMMAR( RD,2,1 )
|
|---|
| 94 | I = 0
|
|---|
| 95 | 1 CONTINUE
|
|---|
| 96 | I = I+1
|
|---|
| 97 | IF ( GX(I) .LT. RD(1) ) GOTO 1
|
|---|
| 98 | XX = ( (RD(1)-GX(I-1))/(GX(I)-GX(I-1)) + I-1 ) * DX
|
|---|
| 99 | ZZ = HX(I-1)
|
|---|
| 100 | C GET RANDOM VARIABLE DISTRIBUTED AS Y(X) BY REJECTION METHOD
|
|---|
| 101 | TT = XX * EXP(1.-XX)
|
|---|
| 102 | IF ( RD(2)*ZZ .GT. TT ) GOTO 11
|
|---|
| 103 |
|
|---|
| 104 | C GET REQUIRED PEAK VALUE
|
|---|
| 105 | PTRANS = XX * C(12)
|
|---|
| 106 | IF ( DEBUG ) WRITE(MDEBUG,*) 'PTRANS: PT = ',SNGL(PTRANS)
|
|---|
| 107 |
|
|---|
| 108 | RETURN
|
|---|
| 109 | END
|
|---|
