| 3820ca8e |
1 | |
| 2 | CDECK ID>, HWSVAL. |
| 3 | |
| 4 | *CMZ :- -26/04/91 10.18.58 by Bryan Webber |
| 5 | |
| 6 | *-- Author : Bryan Webber |
| 7 | |
| 8 | C----------------------------------------------------------------------- |
| 9 | |
| 10 | FUNCTION HWSVAL(ID) |
| 11 | |
| 12 | C----------------------------------------------------------------------- |
| 13 | |
| 14 | C TRUE FOR VALENCE PARTON ID IN INCOMING HADRON INHAD |
| 15 | |
| 16 | C----------------------------------------------------------------------- |
| 17 | |
| 18 | INCLUDE 'HERWIG61.INC' |
| 19 | |
| 20 | INTEGER ID,IDHAD |
| 21 | |
| 22 | LOGICAL HWSVAL |
| 23 | |
| 24 | HWSVAL=.FALSE. |
| 25 | |
| 26 | IDHAD=IDHW(INHAD) |
| 27 | |
| 28 | IF (IDHAD.EQ.73.OR.IDHAD.EQ.75) THEN |
| 29 | |
| 30 | IF (ID.EQ.1.OR.ID.EQ.2) HWSVAL=.TRUE. |
| 31 | |
| 32 | ELSEIF (IDHAD.EQ.91.OR.IDHAD.EQ.93) THEN |
| 33 | |
| 34 | IF (ID.EQ.7.OR.ID.EQ.8) HWSVAL=.TRUE. |
| 35 | |
| 36 | ELSEIF (IDHAD.EQ.30) THEN |
| 37 | |
| 38 | IF (ID.EQ.1.OR.ID.EQ.8) HWSVAL=.TRUE. |
| 39 | |
| 40 | ELSEIF (IDHAD.EQ.38) THEN |
| 41 | |
| 42 | IF (ID.EQ.2.OR.ID.EQ.7) HWSVAL=.TRUE. |
| 43 | |
| 44 | ELSEIF (IDHAD.EQ.59) THEN |
| 45 | |
| 46 | IF (ID.LT.6.OR.(ID.GT.6.AND.ID.LT.12)) HWSVAL=.TRUE. |
| 47 | |
| 48 | ELSEIF (IDHAD.EQ.71.OR.IDHAD.EQ.72) THEN |
| 49 | |
| 50 | IF (ID.EQ.13) HWSVAL=.TRUE. |
| 51 | |
| 52 | ELSE |
| 53 | |
| 54 | CALL HWWARN('HWSVAL',100,*999) |
| 55 | |
| 56 | ENDIF |
| 57 | |
| 58 | 999 END |
| 59 | |
| 60 | CDECK ID>, HWUAEM. |
| 61 | |
| 62 | *CMZ :- -23/08/94 13.22.29 by Mike Seymour |
| 63 | |
| 64 | *-- Author : Ian Knowles |
| 65 | |
| 66 | C----------------------------------------------------------------------- |
| 67 | |
| 68 | FUNCTION HWUAEM(Q2) |
| 69 | |
| 70 | C----------------------------------------------------------------------- |
| 71 | |
| 72 | C Running electromagnetic coupling constant. |
| 73 | |
| 74 | C See R. Kleiss et al.: CERN yellow report 89-08, vol.3 p.129 |
| 75 | |
| 76 | C Hadronic component from: H. Burkhardt et al.: Z. Phys C43 (89) 497 |
| 77 | |
| 78 | C----------------------------------------------------------------------- |
| 79 | |
| 80 | INCLUDE 'HERWIG61.INC' |
| 81 | |
| 82 | DOUBLE PRECISION HWUAEM,HWUAER,Q2,EPS,A1,B1,C1,A2,B2,C2,A3,B3,C3, |
| 83 | |
| 84 | & A4,B4,C4,AEMPI,EEL2,EMU2,ETAU2,ETOP2,REPIGG,X |
| 85 | |
| 86 | LOGICAL FIRST |
| 87 | |
| 88 | EXTERNAL HWUAER |
| 89 | |
| 90 | SAVE FIRST,AEMPI,EEL2,EMU2,ETAU2,ETOP2 |
| 91 | |
| 92 | PARAMETER (EPS=1.D-6) |
| 93 | |
| 94 | DATA A1,B1,C1/0.0 ,0.00835,1.000/ |
| 95 | |
| 96 | DATA A2,B2,C2/0.0 ,0.00238,3.927/ |
| 97 | |
| 98 | DATA A3,B3,C3/0.00165,0.00299,1.000/ |
| 99 | |
| 100 | DATA A4,B4,C4/0.00221,0.00293,1.000/ |
| 101 | |
| 102 | DATA FIRST/.TRUE./ |
| 103 | |
| 104 | IF (FIRST) THEN |
| 105 | |
| 106 | AEMPI=ALPHEM/(THREE*PIFAC) |
| 107 | |
| 108 | EEL2 =RMASS(121)**2 |
| 109 | |
| 110 | EMU2 =RMASS(123)**2 |
| 111 | |
| 112 | ETAU2=RMASS(125)**2 |
| 113 | |
| 114 | ETOP2=RMASS(6)**2 |
| 115 | |
| 116 | FIRST=.FALSE. |
| 117 | |
| 118 | ENDIF |
| 119 | |
| 120 | IF (ABS(Q2).LT.EPS) THEN |
| 121 | |
| 122 | HWUAEM=ALPHEM |
| 123 | |
| 124 | RETURN |
| 125 | |
| 126 | ENDIF |
| 127 | |
| 128 | C Leptonic component |
| 129 | |
| 130 | REPIGG=AEMPI*(HWUAER(EEL2/Q2)+HWUAER(EMU2/Q2)+HWUAER(ETAU2/Q2)) |
| 131 | |
| 132 | C Hadronic component from light quarks |
| 133 | |
| 134 | X=ABS(Q2) |
| 135 | |
| 136 | IF (X.LT.9.D-2) THEN |
| 137 | |
| 138 | REPIGG=REPIGG+A1+B1*LOG(ONE+C1*X) |
| 139 | |
| 140 | ELSEIF (X.LT.9.D0) THEN |
| 141 | |
| 142 | REPIGG=REPIGG+A2+B2*LOG(ONE+C2*X) |
| 143 | |
| 144 | ELSEIF (X.LT.1.D4) THEN |
| 145 | |
| 146 | REPIGG=REPIGG+A3+B3*LOG(ONE+C3*X) |
| 147 | |
| 148 | ELSE |
| 149 | |
| 150 | REPIGG=REPIGG+A4+B4*LOG(ONE+C4*X) |
| 151 | |
| 152 | ENDIF |
| 153 | |
| 154 | C Top Contribution |
| 155 | |
| 156 | REPIGG=REPIGG+AEMPI*HWUAER(ETOP2/Q2) |
| 157 | |
| 158 | HWUAEM=ALPHEM/(ONE-REPIGG) |
| 159 | |
| 160 | RETURN |
| 161 | |
| 162 | END |
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