| fe4da5cc |
1 | |
| 2 | C********************************************************************* |
| 3 | |
| 4 | SUBROUTINE LUCLUS(NJET) |
| 5 | |
| 6 | C...Purpose: to subdivide the particle content of an event into |
| 7 | C...jets/clusters. |
| 8 | COMMON/LUJETS/N,K(4000,5),P(4000,5),V(4000,5) |
| 9 | COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) |
| 10 | COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) |
| 11 | SAVE /LUJETS/,/LUDAT1/,/LUDAT2/ |
| 12 | DIMENSION PS(5) |
| 13 | SAVE NSAV,NP,PS,PSS,RINIT,NPRE,NREM |
| 14 | |
| 15 | C...Functions: distance measure in pT or (pseudo)mass. |
| 16 | R2T(I1,I2)=(P(I1,5)*P(I2,5)-P(I1,1)*P(I2,1)-P(I1,2)*P(I2,2)- |
| 17 | &P(I1,3)*P(I2,3))*2.*P(I1,5)*P(I2,5)/(0.0001+P(I1,5)+P(I2,5))**2 |
| 18 | R2M(I1,I2)=2.*P(I1,4)*P(I2,4)*(1.-(P(I1,1)*P(I2,1)+P(I1,2)* |
| 19 | &P(I2,2)+P(I1,3)*P(I2,3))/(P(I1,5)*P(I2,5))) |
| 20 | |
| 21 | C...If first time, reset. If reentering, skip preliminaries. |
| 22 | IF(MSTU(48).LE.0) THEN |
| 23 | NP=0 |
| 24 | DO 100 J=1,5 |
| 25 | PS(J)=0. |
| 26 | 100 CONTINUE |
| 27 | PSS=0. |
| 28 | ELSE |
| 29 | NJET=NSAV |
| 30 | IF(MSTU(43).GE.2) N=N-NJET |
| 31 | DO 110 I=N+1,N+NJET |
| 32 | P(I,5)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2) |
| 33 | 110 CONTINUE |
| 34 | IF(MSTU(46).LE.3) R2ACC=PARU(44)**2 |
| 35 | IF(MSTU(46).GE.4) R2ACC=PARU(45)*PS(5)**2 |
| 36 | NLOOP=0 |
| 37 | GOTO 300 |
| 38 | ENDIF |
| 39 | |
| 40 | C...Find which particles are to be considered in cluster search. |
| 41 | DO 140 I=1,N |
| 42 | IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 140 |
| 43 | IF(MSTU(41).GE.2) THEN |
| 44 | KC=LUCOMP(K(I,2)) |
| 45 | IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR. |
| 46 | & KC.EQ.18) GOTO 140 |
| 47 | IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0) |
| 48 | & GOTO 140 |
| 49 | ENDIF |
| 50 | IF(N+2*NP.GE.MSTU(4)-MSTU(32)-5) THEN |
| 51 | CALL LUERRM(11,'(LUCLUS:) no more memory left in LUJETS') |
| 52 | NJET=-1 |
| 53 | RETURN |
| 54 | ENDIF |
| 55 | |
| 56 | C...Take copy of these particles, with space left for jets later on. |
| 57 | NP=NP+1 |
| 58 | K(N+NP,3)=I |
| 59 | DO 120 J=1,5 |
| 60 | P(N+NP,J)=P(I,J) |
| 61 | 120 CONTINUE |
| 62 | IF(MSTU(42).EQ.0) P(N+NP,5)=0. |
| 63 | IF(MSTU(42).EQ.1.AND.K(I,2).NE.22) P(N+NP,5)=PMAS(101,1) |
| 64 | P(N+NP,4)=SQRT(P(N+NP,5)**2+P(I,1)**2+P(I,2)**2+P(I,3)**2) |
| 65 | P(N+NP,5)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2) |
| 66 | DO 130 J=1,4 |
| 67 | PS(J)=PS(J)+P(N+NP,J) |
| 68 | 130 CONTINUE |
| 69 | PSS=PSS+P(N+NP,5) |
| 70 | 140 CONTINUE |
| 71 | DO 160 I=N+1,N+NP |
| 72 | K(I+NP,3)=K(I,3) |
| 73 | DO 150 J=1,5 |
| 74 | P(I+NP,J)=P(I,J) |
| 75 | 150 CONTINUE |
| 76 | 160 CONTINUE |
| 77 | PS(5)=SQRT(MAX(0.,PS(4)**2-PS(1)**2-PS(2)**2-PS(3)**2)) |
| 78 | |
| 79 | C...Very low multiplicities not considered. |
| 80 | IF(NP.LT.MSTU(47)) THEN |
| 81 | CALL LUERRM(8,'(LUCLUS:) too few particles for analysis') |
| 82 | NJET=-1 |
| 83 | RETURN |
| 84 | ENDIF |
| 85 | |
| 86 | C...Find precluster configuration. If too few jets, make harder cuts. |
| 87 | NLOOP=0 |
| 88 | IF(MSTU(46).LE.3) R2ACC=PARU(44)**2 |
| 89 | IF(MSTU(46).GE.4) R2ACC=PARU(45)*PS(5)**2 |
| 90 | RINIT=1.25*PARU(43) |
| 91 | IF(NP.LE.MSTU(47)+2) RINIT=0. |
| 92 | 170 RINIT=0.8*RINIT |
| 93 | NPRE=0 |
| 94 | NREM=NP |
| 95 | DO 180 I=N+NP+1,N+2*NP |
| 96 | K(I,4)=0 |
| 97 | 180 CONTINUE |
| 98 | |
| 99 | C...Sum up small momentum region. Jet if enough absolute momentum. |
| 100 | IF(MSTU(46).LE.2) THEN |
| 101 | DO 190 J=1,4 |
| 102 | P(N+1,J)=0. |
| 103 | 190 CONTINUE |
| 104 | DO 210 I=N+NP+1,N+2*NP |
| 105 | IF(P(I,5).GT.2.*RINIT) GOTO 210 |
| 106 | NREM=NREM-1 |
| 107 | K(I,4)=1 |
| 108 | DO 200 J=1,4 |
| 109 | P(N+1,J)=P(N+1,J)+P(I,J) |
| 110 | 200 CONTINUE |
| 111 | 210 CONTINUE |
| 112 | P(N+1,5)=SQRT(P(N+1,1)**2+P(N+1,2)**2+P(N+1,3)**2) |
| 113 | IF(P(N+1,5).GT.2.*RINIT) NPRE=1 |
| 114 | IF(RINIT.GE.0.2*PARU(43).AND.NPRE+NREM.LT.MSTU(47)) GOTO 170 |
| 115 | IF(NREM.EQ.0) GOTO 170 |
| 116 | ENDIF |
| 117 | |
| 118 | C...Find fastest remaining particle. |
| 119 | 220 NPRE=NPRE+1 |
| 120 | PMAX=0. |
| 121 | DO 230 I=N+NP+1,N+2*NP |
| 122 | IF(K(I,4).NE.0.OR.P(I,5).LE.PMAX) GOTO 230 |
| 123 | IMAX=I |
| 124 | PMAX=P(I,5) |
| 125 | 230 CONTINUE |
| 126 | DO 240 J=1,5 |
| 127 | P(N+NPRE,J)=P(IMAX,J) |
| 128 | 240 CONTINUE |
| 129 | NREM=NREM-1 |
| 130 | K(IMAX,4)=NPRE |
| 131 | |
| 132 | C...Sum up precluster around it according to pT separation. |
| 133 | IF(MSTU(46).LE.2) THEN |
| 134 | DO 260 I=N+NP+1,N+2*NP |
| 135 | IF(K(I,4).NE.0) GOTO 260 |
| 136 | R2=R2T(I,IMAX) |
| 137 | IF(R2.GT.RINIT**2) GOTO 260 |
| 138 | NREM=NREM-1 |
| 139 | K(I,4)=NPRE |
| 140 | DO 250 J=1,4 |
| 141 | P(N+NPRE,J)=P(N+NPRE,J)+P(I,J) |
| 142 | 250 CONTINUE |
| 143 | 260 CONTINUE |
| 144 | P(N+NPRE,5)=SQRT(P(N+NPRE,1)**2+P(N+NPRE,2)**2+P(N+NPRE,3)**2) |
| 145 | |
| 146 | C...Sum up precluster around it according to mass separation. |
| 147 | ELSE |
| 148 | 270 IMIN=0 |
| 149 | R2MIN=RINIT**2 |
| 150 | DO 280 I=N+NP+1,N+2*NP |
| 151 | IF(K(I,4).NE.0) GOTO 280 |
| 152 | R2=R2M(I,N+NPRE) |
| 153 | IF(R2.GE.R2MIN) GOTO 280 |
| 154 | IMIN=I |
| 155 | R2MIN=R2 |
| 156 | 280 CONTINUE |
| 157 | IF(IMIN.NE.0) THEN |
| 158 | DO 290 J=1,4 |
| 159 | P(N+NPRE,J)=P(N+NPRE,J)+P(IMIN,J) |
| 160 | 290 CONTINUE |
| 161 | P(N+NPRE,5)=SQRT(P(N+NPRE,1)**2+P(N+NPRE,2)**2+P(N+NPRE,3)**2) |
| 162 | NREM=NREM-1 |
| 163 | K(IMIN,4)=NPRE |
| 164 | GOTO 270 |
| 165 | ENDIF |
| 166 | ENDIF |
| 167 | |
| 168 | C...Check if more preclusters to be found. Start over if too few. |
| 169 | IF(RINIT.GE.0.2*PARU(43).AND.NPRE+NREM.LT.MSTU(47)) GOTO 170 |
| 170 | IF(NREM.GT.0) GOTO 220 |
| 171 | NJET=NPRE |
| 172 | |
| 173 | C...Reassign all particles to nearest jet. Sum up new jet momenta. |
| 174 | 300 TSAV=0. |
| 175 | PSJT=0. |
| 176 | 310 IF(MSTU(46).LE.1) THEN |
| 177 | DO 330 I=N+1,N+NJET |
| 178 | DO 320 J=1,4 |
| 179 | V(I,J)=0. |
| 180 | 320 CONTINUE |
| 181 | 330 CONTINUE |
| 182 | DO 360 I=N+NP+1,N+2*NP |
| 183 | R2MIN=PSS**2 |
| 184 | DO 340 IJET=N+1,N+NJET |
| 185 | IF(P(IJET,5).LT.RINIT) GOTO 340 |
| 186 | R2=R2T(I,IJET) |
| 187 | IF(R2.GE.R2MIN) GOTO 340 |
| 188 | IMIN=IJET |
| 189 | R2MIN=R2 |
| 190 | 340 CONTINUE |
| 191 | K(I,4)=IMIN-N |
| 192 | DO 350 J=1,4 |
| 193 | V(IMIN,J)=V(IMIN,J)+P(I,J) |
| 194 | 350 CONTINUE |
| 195 | 360 CONTINUE |
| 196 | PSJT=0. |
| 197 | DO 380 I=N+1,N+NJET |
| 198 | DO 370 J=1,4 |
| 199 | P(I,J)=V(I,J) |
| 200 | 370 CONTINUE |
| 201 | P(I,5)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2) |
| 202 | PSJT=PSJT+P(I,5) |
| 203 | 380 CONTINUE |
| 204 | ENDIF |
| 205 | |
| 206 | C...Find two closest jets. |
| 207 | R2MIN=2.*MAX(R2ACC,PS(5)**2) |
| 208 | DO 400 ITRY1=N+1,N+NJET-1 |
| 209 | DO 390 ITRY2=ITRY1+1,N+NJET |
| 210 | IF(MSTU(46).LE.2) R2=R2T(ITRY1,ITRY2) |
| 211 | IF(MSTU(46).GE.3) R2=R2M(ITRY1,ITRY2) |
| 212 | IF(R2.GE.R2MIN) GOTO 390 |
| 213 | IMIN1=ITRY1 |
| 214 | IMIN2=ITRY2 |
| 215 | R2MIN=R2 |
| 216 | 390 CONTINUE |
| 217 | 400 CONTINUE |
| 218 | |
| 219 | C...If allowed, join two closest jets and start over. |
| 220 | IF(NJET.GT.MSTU(47).AND.R2MIN.LT.R2ACC) THEN |
| 221 | IREC=MIN(IMIN1,IMIN2) |
| 222 | IDEL=MAX(IMIN1,IMIN2) |
| 223 | DO 410 J=1,4 |
| 224 | P(IREC,J)=P(IMIN1,J)+P(IMIN2,J) |
| 225 | 410 CONTINUE |
| 226 | P(IREC,5)=SQRT(P(IREC,1)**2+P(IREC,2)**2+P(IREC,3)**2) |
| 227 | DO 430 I=IDEL+1,N+NJET |
| 228 | DO 420 J=1,5 |
| 229 | P(I-1,J)=P(I,J) |
| 230 | 420 CONTINUE |
| 231 | 430 CONTINUE |
| 232 | IF(MSTU(46).GE.2) THEN |
| 233 | DO 440 I=N+NP+1,N+2*NP |
| 234 | IORI=N+K(I,4) |
| 235 | IF(IORI.EQ.IDEL) K(I,4)=IREC-N |
| 236 | IF(IORI.GT.IDEL) K(I,4)=K(I,4)-1 |
| 237 | 440 CONTINUE |
| 238 | ENDIF |
| 239 | NJET=NJET-1 |
| 240 | GOTO 300 |
| 241 | |
| 242 | C...Divide up broad jet if empty cluster in list of final ones. |
| 243 | ELSEIF(NJET.EQ.MSTU(47).AND.MSTU(46).LE.1.AND.NLOOP.LE.2) THEN |
| 244 | DO 450 I=N+1,N+NJET |
| 245 | K(I,5)=0 |
| 246 | 450 CONTINUE |
| 247 | DO 460 I=N+NP+1,N+2*NP |
| 248 | K(N+K(I,4),5)=K(N+K(I,4),5)+1 |
| 249 | 460 CONTINUE |
| 250 | IEMP=0 |
| 251 | DO 470 I=N+1,N+NJET |
| 252 | IF(K(I,5).EQ.0) IEMP=I |
| 253 | 470 CONTINUE |
| 254 | IF(IEMP.NE.0) THEN |
| 255 | NLOOP=NLOOP+1 |
| 256 | ISPL=0 |
| 257 | R2MAX=0. |
| 258 | DO 480 I=N+NP+1,N+2*NP |
| 259 | IF(K(N+K(I,4),5).LE.1.OR.P(I,5).LT.RINIT) GOTO 480 |
| 260 | IJET=N+K(I,4) |
| 261 | R2=R2T(I,IJET) |
| 262 | IF(R2.LE.R2MAX) GOTO 480 |
| 263 | ISPL=I |
| 264 | R2MAX=R2 |
| 265 | 480 CONTINUE |
| 266 | IF(ISPL.NE.0) THEN |
| 267 | IJET=N+K(ISPL,4) |
| 268 | DO 490 J=1,4 |
| 269 | P(IEMP,J)=P(ISPL,J) |
| 270 | P(IJET,J)=P(IJET,J)-P(ISPL,J) |
| 271 | 490 CONTINUE |
| 272 | P(IEMP,5)=P(ISPL,5) |
| 273 | P(IJET,5)=SQRT(P(IJET,1)**2+P(IJET,2)**2+P(IJET,3)**2) |
| 274 | IF(NLOOP.LE.2) GOTO 300 |
| 275 | ENDIF |
| 276 | ENDIF |
| 277 | ENDIF |
| 278 | |
| 279 | C...If generalized thrust has not yet converged, continue iteration. |
| 280 | IF(MSTU(46).LE.1.AND.NLOOP.LE.2.AND.PSJT/PSS.GT.TSAV+PARU(48)) |
| 281 | &THEN |
| 282 | TSAV=PSJT/PSS |
| 283 | GOTO 310 |
| 284 | ENDIF |
| 285 | |
| 286 | C...Reorder jets according to energy. |
| 287 | DO 510 I=N+1,N+NJET |
| 288 | DO 500 J=1,5 |
| 289 | V(I,J)=P(I,J) |
| 290 | 500 CONTINUE |
| 291 | 510 CONTINUE |
| 292 | DO 540 INEW=N+1,N+NJET |
| 293 | PEMAX=0. |
| 294 | DO 520 ITRY=N+1,N+NJET |
| 295 | IF(V(ITRY,4).LE.PEMAX) GOTO 520 |
| 296 | IMAX=ITRY |
| 297 | PEMAX=V(ITRY,4) |
| 298 | 520 CONTINUE |
| 299 | K(INEW,1)=31 |
| 300 | K(INEW,2)=97 |
| 301 | K(INEW,3)=INEW-N |
| 302 | K(INEW,4)=0 |
| 303 | DO 530 J=1,5 |
| 304 | P(INEW,J)=V(IMAX,J) |
| 305 | 530 CONTINUE |
| 306 | V(IMAX,4)=-1. |
| 307 | K(IMAX,5)=INEW |
| 308 | 540 CONTINUE |
| 309 | |
| 310 | C...Clean up particle-jet assignments and jet information. |
| 311 | DO 550 I=N+NP+1,N+2*NP |
| 312 | IORI=K(N+K(I,4),5) |
| 313 | K(I,4)=IORI-N |
| 314 | IF(K(K(I,3),1).NE.3) K(K(I,3),4)=IORI-N |
| 315 | K(IORI,4)=K(IORI,4)+1 |
| 316 | 550 CONTINUE |
| 317 | IEMP=0 |
| 318 | PSJT=0. |
| 319 | DO 570 I=N+1,N+NJET |
| 320 | K(I,5)=0 |
| 321 | PSJT=PSJT+P(I,5) |
| 322 | P(I,5)=SQRT(MAX(P(I,4)**2-P(I,5)**2,0.)) |
| 323 | DO 560 J=1,5 |
| 324 | V(I,J)=0. |
| 325 | 560 CONTINUE |
| 326 | IF(K(I,4).EQ.0) IEMP=I |
| 327 | 570 CONTINUE |
| 328 | |
| 329 | C...Select storing option. Output variables. Check for failure. |
| 330 | MSTU(61)=N+1 |
| 331 | MSTU(62)=NP |
| 332 | MSTU(63)=NPRE |
| 333 | PARU(61)=PS(5) |
| 334 | PARU(62)=PSJT/PSS |
| 335 | PARU(63)=SQRT(R2MIN) |
| 336 | IF(NJET.LE.1) PARU(63)=0. |
| 337 | IF(IEMP.NE.0) THEN |
| 338 | CALL LUERRM(8,'(LUCLUS:) failed to reconstruct as requested') |
| 339 | NJET=-1 |
| 340 | ENDIF |
| 341 | IF(MSTU(43).LE.1) MSTU(3)=NJET |
| 342 | IF(MSTU(43).GE.2) N=N+NJET |
| 343 | NSAV=NJET |
| 344 | |
| 345 | RETURN |
| 346 | END |
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