| 3820ca8e |
1 | |
| 2 | CDECK ID>, HWSSPC. |
| 3 | |
| 4 | *CMZ :- -26/04/91 11.11.56 by Bryan Webber |
| 5 | |
| 6 | *-- Author : Bryan Webber |
| 7 | |
| 8 | C----------------------------------------------------------------------- |
| 9 | |
| 10 | SUBROUTINE HWSSPC |
| 11 | |
| 12 | C----------------------------------------------------------------------- |
| 13 | |
| 14 | C REPLACES SPACELIKE PARTONS BY SPECTATORS |
| 15 | |
| 16 | C----------------------------------------------------------------------- |
| 17 | |
| 18 | INCLUDE 'HERWIG61.INC' |
| 19 | |
| 20 | DOUBLE PRECISION HWUSQR,EMSQ,EMTR,EPAR,XPAR,QSQ,PCL(5) |
| 21 | |
| 22 | INTEGER KHEP,IP,JP,IDH,IDP,ISP,IDSPC,JHEP |
| 23 | |
| 24 | EXTERNAL HWUSQR |
| 25 | |
| 26 | IF (IERROR.NE.0) RETURN |
| 27 | |
| 28 | DO 50 KHEP=1,NHEP |
| 29 | |
| 30 | IF (ISTHEP(KHEP).EQ.145.OR.ISTHEP(KHEP).EQ.146) THEN |
| 31 | |
| 32 | IP=ISTHEP(KHEP)-144 |
| 33 | |
| 34 | JP=IP |
| 35 | |
| 36 | IF (JDAHEP(1,IP).NE.0) JP=JDAHEP(1,IP) |
| 37 | |
| 38 | IDH=IDHW(JP) |
| 39 | |
| 40 | IDP=IDHW(KHEP) |
| 41 | |
| 42 | IF (IDH.NE.IDP) THEN |
| 43 | |
| 44 | IF (IDH.EQ.59) THEN |
| 45 | |
| 46 | C---PHOTON CASE |
| 47 | |
| 48 | IF (IDP.LT.7) THEN |
| 49 | |
| 50 | IDSPC=IDP+6 |
| 51 | |
| 52 | ELSEIF (IDP.LT.13) THEN |
| 53 | |
| 54 | IDSPC=IDP-6 |
| 55 | |
| 56 | ELSE |
| 57 | |
| 58 | CALL HWWARN('HWSSPC',100,*999) |
| 59 | |
| 60 | ENDIF |
| 61 | |
| 62 | C---IDENTIFY SPECTATOR |
| 63 | |
| 64 | C (1) QUARK CASE |
| 65 | |
| 66 | ELSEIF (IDP.LE.3) THEN |
| 67 | |
| 68 | DO 10 ISP=1,12 |
| 69 | |
| 70 | 10 IF (IDH.EQ.NCLDK(LOCN(IDP,ISP))) GOTO 20 |
| 71 | |
| 72 | CALL HWWARN('HWSSPC',101,*999) |
| 73 | |
| 74 | 20 IF (ISP.LE.3) THEN |
| 75 | |
| 76 | IDSPC=ISP+6 |
| 77 | |
| 78 | ELSEIF (ISP.LE.9) THEN |
| 79 | |
| 80 | IDSPC=ISP+105 |
| 81 | |
| 82 | ELSE |
| 83 | |
| 84 | IDSPC=ISP |
| 85 | |
| 86 | ENDIF |
| 87 | |
| 88 | C---(2) ANTIQUARK CASE |
| 89 | |
| 90 | ELSEIF (IDP.GT.6.AND.IDP.LE.9) THEN |
| 91 | |
| 92 | IDP=IDP-6 |
| 93 | |
| 94 | DO 30 ISP=1,12 |
| 95 | |
| 96 | 30 IF (IDH.EQ.NCLDK(LOCN(ISP,IDP))) GOTO 40 |
| 97 | |
| 98 | CALL HWWARN('HWSSPC',103,*999) |
| 99 | |
| 100 | RETURN |
| 101 | |
| 102 | 40 IF (ISP.LE.3) THEN |
| 103 | |
| 104 | IDSPC=ISP |
| 105 | |
| 106 | ELSEIF (ISP.LE.9) THEN |
| 107 | |
| 108 | IDSPC=ISP+111 |
| 109 | |
| 110 | ELSE |
| 111 | |
| 112 | IDSPC=ISP-6 |
| 113 | |
| 114 | ENDIF |
| 115 | |
| 116 | C---SPECIAL CASE FOR REMNANT HADRON |
| 117 | |
| 118 | ELSEIF (IDH.EQ.71.OR.IDH.EQ.72) THEN |
| 119 | |
| 120 | IF (IDP.EQ.13) THEN |
| 121 | |
| 122 | IDSPC=IDP |
| 123 | |
| 124 | ELSE |
| 125 | |
| 126 | CALL HWWARN('HWSSPC',106,*999) |
| 127 | |
| 128 | ENDIF |
| 129 | |
| 130 | ELSE |
| 131 | |
| 132 | CALL HWWARN('HWSSPC',105,*999) |
| 133 | |
| 134 | ENDIF |
| 135 | |
| 136 | C---REPLACE PARTON BY SPECTATOR |
| 137 | |
| 138 | IDHW(KHEP)=IDSPC |
| 139 | |
| 140 | IDHEP(KHEP)=IDPDG(IDSPC) |
| 141 | |
| 142 | ISTHEP(KHEP)=146+IP |
| 143 | |
| 144 | EMSQ=SIGN(PHEP(5,KHEP)**2,PHEP(5,KHEP)) |
| 145 | |
| 146 | EMTR=EMSQ+PHEP(1,KHEP)**2+PHEP(2,KHEP)**2 |
| 147 | |
| 148 | EPAR=PHEP(4,KHEP) |
| 149 | |
| 150 | CALL HWVDIF(4,PHEP(1,JP),PHEP(1,KHEP),PHEP(1,KHEP)) |
| 151 | |
| 152 | IF (EPAR**2.LT.10000.*ABS(EMTR)) THEN |
| 153 | |
| 154 | CALL HWUMAS(PHEP(1,KHEP)) |
| 155 | |
| 156 | ELSE |
| 157 | |
| 158 | C---COMPUTE SPECTATOR MASS ELIMINATING ROUNDING ERRORS |
| 159 | |
| 160 | XPAR=EPAR/PHEP(4,JP) |
| 161 | |
| 162 | QSQ=SIGN(PHEP(5,JP)**2,PHEP(5,JP)) |
| 163 | |
| 164 | PHEP(5,KHEP)=HWUSQR((1.-XPAR)*QSQ+EMSQ-EMTR/XPAR |
| 165 | |
| 166 | & -((QSQ*XPAR**2-EMTR)/(2*EPAR*XPAR**2))**2*XPAR) |
| 167 | |
| 168 | ENDIF |
| 169 | |
| 170 | C---CHECK FOR UNPHYSICAL SPECTATOR |
| 171 | |
| 172 | IF (PHEP(4,KHEP).LT.ZERO) FROST=.TRUE. |
| 173 | |
| 174 | C---FIND MASS OF CORRESPONDING CLUSTER, IF PARTNER IS IN THE SAME JET |
| 175 | |
| 176 | IF (QORQQB(IDHW(KHEP))) THEN |
| 177 | |
| 178 | JHEP=JMOHEP(2,KHEP) |
| 179 | |
| 180 | ELSEIF (QBORQQ(IDHW(KHEP))) THEN |
| 181 | |
| 182 | JHEP=JDAHEP(2,KHEP) |
| 183 | |
| 184 | ELSE |
| 185 | |
| 186 | JHEP=0 |
| 187 | |
| 188 | ENDIF |
| 189 | |
| 190 | IF (JHEP.GT.0) THEN |
| 191 | |
| 192 | CALL HWVSUM(4,PHEP(1,KHEP),PHEP(1,JHEP),PCL) |
| 193 | |
| 194 | CALL HWUMAS(PCL) |
| 195 | |
| 196 | C---IF IT IS NEGATIVE, REJECT |
| 197 | |
| 198 | IF (PCL(5).LT.ZERO) FROST=.TRUE. |
| 199 | |
| 200 | ENDIF |
| 201 | |
| 202 | ENDIF |
| 203 | |
| 204 | ENDIF |
| 205 | |
| 206 | 50 CONTINUE |
| 207 | |
| 208 | 999 END |
| 209 | |
| 210 | CDECK ID>, HWSSUD. |
| 211 | |
| 212 | *CMZ :- -26/04/91 11.11.56 by Bryan Webber |
| 213 | |
| 214 | *-- Author : Bryan Webber |
| 215 | |
| 216 | C----------------------------------------------------------------------- |
| 217 | |
| 218 | FUNCTION HWSSUD(I) |
| 219 | |
| 220 | C----------------------------------------------------------------------- |
| 221 | |
| 222 | INCLUDE 'HERWIG61.INC' |
| 223 | |
| 224 | DOUBLE PRECISION HWSSUD,HWSGQQ,DMIN,QSCA,XLAST,DIST(13) |
| 225 | |
| 226 | INTEGER I,N0,IS,ID |
| 227 | |
| 228 | EXTERNAL HWSGQQ |
| 229 | |
| 230 | COMMON/HWTABC/XLAST,N0,IS,ID |
| 231 | |
| 232 | DATA DMIN/1.D-15/ |
| 233 | |
| 234 | QSCA=QEV(N0+I,IS) |
| 235 | |
| 236 | CALL HWSFUN(XLAST,QSCA,IDHW(INHAD),NSTRU,DIST,JNHAD) |
| 237 | |
| 238 | IF (ID.EQ.13) DIST(ID)=DIST(ID)*HWSGQQ(QSCA) |
| 239 | |
| 240 | IF (DIST(ID).LT.DMIN) DIST(ID)=DMIN |
| 241 | |
| 242 | HWSSUD=SUD(N0+I,IS)/DIST(ID) |
| 243 | |
| 244 | END |
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