| e74335a4 |
1 | * $Id$ |
| 2 | |
| 3 | C********************************************************************* |
| 4 | |
| 5 | SUBROUTINE LUCELL_HIJING(NJET) |
| 6 | |
| 7 | C...Purpose: to provide a simple way of jet finding in an eta-phi-ET |
| 8 | C...coordinate frame, as used for calorimeters at hadron colliders. |
| 9 | #include "lujets_hijing.inc" |
| 10 | #include "ludat1_hijing.inc" |
| 11 | #include "ludat2_hijing.inc" |
| 12 | |
| 13 | C...Loop over all particles. Find cell that was hit by given particle. |
| 14 | NCE2=2*MSTU(51)*MSTU(52) |
| 15 | PTLRAT=1./SINH(PARU(51))**2 |
| 16 | NP=0 |
| 17 | NC=N |
| 18 | DO 110 I=1,N |
| 19 | IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 110 |
| 20 | IF(P(I,1)**2+P(I,2)**2.LE.PTLRAT*P(I,3)**2) GOTO 110 |
| 21 | IF(MSTU(41).GE.2) THEN |
| 22 | KC=LUCOMP_HIJING(K(I,2)) |
| 23 | IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR. |
| 24 | & KC.EQ.18) GOTO 110 |
| 25 | IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE_HIJING(K(I,2)) |
| 26 | $ .EQ.0)GOTO 110 |
| 27 | ENDIF |
| 28 | NP=NP+1 |
| 29 | PT=SQRT(P(I,1)**2+P(I,2)**2) |
| 30 | ETA=SIGN(LOG((SQRT(PT**2+P(I,3)**2)+ABS(P(I,3)))/PT),P(I,3)) |
| 31 | IETA=MAX(1,MIN(MSTU(51),1+INT(MSTU(51)*0.5*(ETA/PARU(51)+1.)))) |
| 32 | PHI=ULANGL_HIJING(P(I,1),P(I,2)) |
| 33 | IPHI=MAX(1,MIN(MSTU(52),1+INT(MSTU(52)*0.5*(PHI/PARU(1)+1.)))) |
| 34 | IETPH=MSTU(52)*IETA+IPHI |
| 35 | |
| 36 | C...Add to cell already hit, or book new cell. |
| 37 | DO 100 IC=N+1,NC |
| 38 | IF(IETPH.EQ.K(IC,3)) THEN |
| 39 | K(IC,4)=K(IC,4)+1 |
| 40 | P(IC,5)=P(IC,5)+PT |
| 41 | GOTO 110 |
| 42 | ENDIF |
| 43 | 100 CONTINUE |
| 44 | IF(NC.GE.MSTU(4)-MSTU(32)-5) THEN |
| 45 | CALL LUERRM_HIJING(11 |
| 46 | $ ,'(LUCELL_HIJING:) no more memory left in LUJETS_HIJING') |
| 47 | NJET=-2 |
| 48 | RETURN |
| 49 | ENDIF |
| 50 | NC=NC+1 |
| 51 | K(NC,3)=IETPH |
| 52 | K(NC,4)=1 |
| 53 | K(NC,5)=2 |
| 54 | P(NC,1)=(PARU(51)/MSTU(51))*(2*IETA-1-MSTU(51)) |
| 55 | P(NC,2)=(PARU(1)/MSTU(52))*(2*IPHI-1-MSTU(52)) |
| 56 | P(NC,5)=PT |
| 57 | 110 CONTINUE |
| 58 | |
| 59 | C...Smear true bin content by calorimeter resolution. |
| 60 | IF(MSTU(53).GE.1) THEN |
| 61 | DO 130 IC=N+1,NC |
| 62 | PEI=P(IC,5) |
| 63 | IF(MSTU(53).EQ.2) PEI=P(IC,5)/COSH(P(IC,1)) |
| 64 | 120 PEF=PEI+PARU(55)*SQRT(-2.*LOG(MAX(1E-10,RLU_HIJING(0)))*PEI)* |
| 65 | & COS(PARU(2)*RLU_HIJING(0)) |
| 66 | IF(PEF.LT.0..OR.PEF.GT.PARU(56)*PEI) GOTO 120 |
| 67 | P(IC,5)=PEF |
| 68 | 130 IF(MSTU(53).EQ.2) P(IC,5)=PEF*COSH(P(IC,1)) |
| 69 | ENDIF |
| 70 | |
| 71 | C...Find initiator cell: the one with highest pT of not yet used ones. |
| 72 | NJ=NC |
| 73 | 140 ETMAX=0. |
| 74 | DO 150 IC=N+1,NC |
| 75 | IF(K(IC,5).NE.2) GOTO 150 |
| 76 | IF(P(IC,5).LE.ETMAX) GOTO 150 |
| 77 | ICMAX=IC |
| 78 | ETA=P(IC,1) |
| 79 | PHI=P(IC,2) |
| 80 | ETMAX=P(IC,5) |
| 81 | 150 CONTINUE |
| 82 | IF(ETMAX.LT.PARU(52)) GOTO 210 |
| 83 | IF(NJ.GE.MSTU(4)-MSTU(32)-5) THEN |
| 84 | CALL LUERRM_HIJING(11 |
| 85 | $ ,'(LUCELL_HIJING:) no more memory left in LUJETS_HIJING') |
| 86 | NJET=-2 |
| 87 | RETURN |
| 88 | ENDIF |
| 89 | K(ICMAX,5)=1 |
| 90 | NJ=NJ+1 |
| 91 | K(NJ,4)=0 |
| 92 | K(NJ,5)=1 |
| 93 | P(NJ,1)=ETA |
| 94 | P(NJ,2)=PHI |
| 95 | P(NJ,3)=0. |
| 96 | P(NJ,4)=0. |
| 97 | P(NJ,5)=0. |
| 98 | |
| 99 | C...Sum up unused cells within required distance of initiator. |
| 100 | DO 160 IC=N+1,NC |
| 101 | IF(K(IC,5).EQ.0) GOTO 160 |
| 102 | IF(ABS(P(IC,1)-ETA).GT.PARU(54)) GOTO 160 |
| 103 | DPHIA=ABS(P(IC,2)-PHI) |
| 104 | IF(DPHIA.GT.PARU(54).AND.DPHIA.LT.PARU(2)-PARU(54)) GOTO 160 |
| 105 | PHIC=P(IC,2) |
| 106 | IF(DPHIA.GT.PARU(1)) PHIC=PHIC+SIGN(PARU(2),PHI) |
| 107 | IF((P(IC,1)-ETA)**2+(PHIC-PHI)**2.GT.PARU(54)**2) GOTO 160 |
| 108 | K(IC,5)=-K(IC,5) |
| 109 | K(NJ,4)=K(NJ,4)+K(IC,4) |
| 110 | P(NJ,3)=P(NJ,3)+P(IC,5)*P(IC,1) |
| 111 | P(NJ,4)=P(NJ,4)+P(IC,5)*PHIC |
| 112 | P(NJ,5)=P(NJ,5)+P(IC,5) |
| 113 | 160 CONTINUE |
| 114 | |
| 115 | C...Reject cluster below minimum ET, else accept. |
| 116 | IF(P(NJ,5).LT.PARU(53)) THEN |
| 117 | NJ=NJ-1 |
| 118 | DO 170 IC=N+1,NC |
| 119 | 170 IF(K(IC,5).LT.0) K(IC,5)=-K(IC,5) |
| 120 | ELSEIF(MSTU(54).LE.2) THEN |
| 121 | P(NJ,3)=P(NJ,3)/P(NJ,5) |
| 122 | P(NJ,4)=P(NJ,4)/P(NJ,5) |
| 123 | IF(ABS(P(NJ,4)).GT.PARU(1)) P(NJ,4)=P(NJ,4)-SIGN(PARU(2), |
| 124 | & P(NJ,4)) |
| 125 | DO 180 IC=N+1,NC |
| 126 | 180 IF(K(IC,1).LT.0) K(IC,1)=0 |
| 127 | ELSE |
| 128 | DO 190 J=1,4 |
| 129 | 190 P(NJ,J)=0. |
| 130 | DO 200 IC=N+1,NC |
| 131 | IF(K(IC,5).GE.0) GOTO 200 |
| 132 | P(NJ,1)=P(NJ,1)+P(IC,5)*COS(P(IC,2)) |
| 133 | P(NJ,2)=P(NJ,2)+P(IC,5)*SIN(P(IC,2)) |
| 134 | P(NJ,3)=P(NJ,3)+P(IC,5)*SINH(P(IC,1)) |
| 135 | P(NJ,4)=P(NJ,4)+P(IC,5)*COSH(P(IC,1)) |
| 136 | K(IC,5)=0 |
| 137 | 200 CONTINUE |
| 138 | ENDIF |
| 139 | GOTO 140 |
| 140 | |
| 141 | C...Arrange clusters in falling ET sequence. |
| 142 | 210 DO 230 I=1,NJ-NC |
| 143 | ETMAX=0. |
| 144 | DO 220 IJ=NC+1,NJ |
| 145 | IF(K(IJ,5).EQ.0) GOTO 220 |
| 146 | IF(P(IJ,5).LT.ETMAX) GOTO 220 |
| 147 | IJMAX=IJ |
| 148 | ETMAX=P(IJ,5) |
| 149 | 220 CONTINUE |
| 150 | K(IJMAX,5)=0 |
| 151 | K(N+I,1)=31 |
| 152 | K(N+I,2)=98 |
| 153 | K(N+I,3)=I |
| 154 | K(N+I,4)=K(IJMAX,4) |
| 155 | K(N+I,5)=0 |
| 156 | DO 230 J=1,5 |
| 157 | P(N+I,J)=P(IJMAX,J) |
| 158 | 230 V(N+I,J)=0. |
| 159 | NJET=NJ-NC |
| 160 | |
| 161 | C...Convert to massless or massive four-vectors. |
| 162 | IF(MSTU(54).EQ.2) THEN |
| 163 | DO 240 I=N+1,N+NJET |
| 164 | ETA=P(I,3) |
| 165 | P(I,1)=P(I,5)*COS(P(I,4)) |
| 166 | P(I,2)=P(I,5)*SIN(P(I,4)) |
| 167 | P(I,3)=P(I,5)*SINH(ETA) |
| 168 | P(I,4)=P(I,5)*COSH(ETA) |
| 169 | 240 P(I,5)=0. |
| 170 | ELSEIF(MSTU(54).GE.3) THEN |
| 171 | DO 250 I=N+1,N+NJET |
| 172 | 250 P(I,5)=SQRT(MAX(0.,P(I,4)**2-P(I,1)**2-P(I,2)**2-P(I,3)**2)) |
| 173 | ENDIF |
| 174 | |
| 175 | C...Information about storage. |
| 176 | MSTU(61)=N+1 |
| 177 | MSTU(62)=NP |
| 178 | MSTU(63)=NC-N |
| 179 | IF(MSTU(43).LE.1) MSTU(3)=NJET |
| 180 | IF(MSTU(43).GE.2) N=N+NJET |
| 181 | |
| 182 | RETURN |
| 183 | END |
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