| e74335a4 |
1 | * $Id$ |
| 2 | |
| 3 | C********************************************************************* |
| 4 | |
| 5 | SUBROUTINE LUTHRU_HIJING(THR,OBL) |
| 6 | |
| 7 | C...Purpose: to perform thrust analysis to give thrust, oblateness |
| 8 | C...and the related event axes. |
| 9 | #include "lujets_hijing.inc" |
| 10 | #include "ludat1_hijing.inc" |
| 11 | #include "ludat2_hijing.inc" |
| 12 | DIMENSION TDI(3),TPR(3) |
| 13 | |
| 14 | C...Take copy of particles that are to be considered in thrust analysis. |
| 15 | NP=0 |
| 16 | PS=0. |
| 17 | DO 100 I=1,N |
| 18 | IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 100 |
| 19 | IF(MSTU(41).GE.2) THEN |
| 20 | KC=LUCOMP_HIJING(K(I,2)) |
| 21 | IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR. |
| 22 | & KC.EQ.18) GOTO 100 |
| 23 | IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE_HIJING(K(I,2)) |
| 24 | $ .EQ.0)GOTO 100 |
| 25 | ENDIF |
| 26 | IF(N+NP+MSTU(44)+15.GE.MSTU(4)-MSTU(32)-5) THEN |
| 27 | CALL LUERRM_HIJING(11 |
| 28 | $ ,'(LUTHRU_HIJING:) no more memory left in LUJETS_HIJING') |
| 29 | THR=-2. |
| 30 | OBL=-2. |
| 31 | RETURN |
| 32 | ENDIF |
| 33 | NP=NP+1 |
| 34 | K(N+NP,1)=23 |
| 35 | P(N+NP,1)=P(I,1) |
| 36 | P(N+NP,2)=P(I,2) |
| 37 | P(N+NP,3)=P(I,3) |
| 38 | P(N+NP,4)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2) |
| 39 | P(N+NP,5)=1. |
| 40 | IF(ABS(PARU(42)-1.).GT.0.001) P(N+NP,5)=P(N+NP,4)**(PARU(42)-1.) |
| 41 | PS=PS+P(N+NP,4)*P(N+NP,5) |
| 42 | 100 CONTINUE |
| 43 | |
| 44 | C...Very low multiplicities (0 or 1) not considered. |
| 45 | IF(NP.LE.1) THEN |
| 46 | CALL LUERRM_HIJING(8 |
| 47 | $ ,'(LUTHRU_HIJING:) too few particles for analysis') |
| 48 | THR=-1. |
| 49 | OBL=-1. |
| 50 | RETURN |
| 51 | ENDIF |
| 52 | |
| 53 | C...Loop over thrust and major. T axis along z direction in latter case. |
| 54 | DO 280 ILD=1,2 |
| 55 | IF(ILD.EQ.2) THEN |
| 56 | K(N+NP+1,1)=31 |
| 57 | PHI=ULANGL_HIJING(P(N+NP+1,1),P(N+NP+1,2)) |
| 58 | CALL LUDBRB_HIJING(N+1,N+NP+1,0.,-PHI,0D0,0D0,0D0) |
| 59 | THE=ULANGL_HIJING(P(N+NP+1,3),P(N+NP+1,1)) |
| 60 | CALL LUDBRB_HIJING(N+1,N+NP+1,-THE,0.,0D0,0D0,0D0) |
| 61 | ENDIF |
| 62 | |
| 63 | C...Find and order particles with highest p (pT for major). |
| 64 | DO 110 ILF=N+NP+4,N+NP+MSTU(44)+4 |
| 65 | 110 P(ILF,4)=0. |
| 66 | DO 150 I=N+1,N+NP |
| 67 | IF(ILD.EQ.2) P(I,4)=SQRT(P(I,1)**2+P(I,2)**2) |
| 68 | DO 120 ILF=N+NP+MSTU(44)+3,N+NP+4,-1 |
| 69 | IF(P(I,4).LE.P(ILF,4)) GOTO 130 |
| 70 | DO 120 J=1,5 |
| 71 | 120 P(ILF+1,J)=P(ILF,J) |
| 72 | ILF=N+NP+3 |
| 73 | 130 DO 140 J=1,5 |
| 74 | 140 P(ILF+1,J)=P(I,J) |
| 75 | 150 CONTINUE |
| 76 | |
| 77 | C...Find and order initial axes with highest thrust (major). |
| 78 | DO 160 ILG=N+NP+MSTU(44)+5,N+NP+MSTU(44)+15 |
| 79 | 160 P(ILG,4)=0. |
| 80 | NC=2**(MIN(MSTU(44),NP)-1) |
| 81 | DO 220 ILC=1,NC |
| 82 | DO 170 J=1,3 |
| 83 | 170 TDI(J)=0. |
| 84 | DO 180 ILF=1,MIN(MSTU(44),NP) |
| 85 | SGN=P(N+NP+ILF+3,5) |
| 86 | IF(2**ILF*((ILC+2**(ILF-1)-1)/2**ILF).GE.ILC) SGN=-SGN |
| 87 | DO 180 J=1,4-ILD |
| 88 | 180 TDI(J)=TDI(J)+SGN*P(N+NP+ILF+3,J) |
| 89 | TDS=TDI(1)**2+TDI(2)**2+TDI(3)**2 |
| 90 | DO 190 ILG=N+NP+MSTU(44)+MIN(ILC,10)+4,N+NP+MSTU(44)+5,-1 |
| 91 | IF(TDS.LE.P(ILG,4)) GOTO 200 |
| 92 | DO 190 J=1,4 |
| 93 | 190 P(ILG+1,J)=P(ILG,J) |
| 94 | ILG=N+NP+MSTU(44)+4 |
| 95 | 200 DO 210 J=1,3 |
| 96 | 210 P(ILG+1,J)=TDI(J) |
| 97 | P(ILG+1,4)=TDS |
| 98 | 220 CONTINUE |
| 99 | |
| 100 | C...Iterate direction of axis until stable maximum. |
| 101 | P(N+NP+ILD,4)=0. |
| 102 | ILG=0 |
| 103 | 230 ILG=ILG+1 |
| 104 | THP=0. |
| 105 | 240 THPS=THP |
| 106 | DO 250 J=1,3 |
| 107 | IF(THP.LE.1E-10) TDI(J)=P(N+NP+MSTU(44)+4+ILG,J) |
| 108 | IF(THP.GT.1E-10) TDI(J)=TPR(J) |
| 109 | 250 TPR(J)=0. |
| 110 | DO 260 I=N+1,N+NP |
| 111 | SGN=SIGN(P(I,5),TDI(1)*P(I,1)+TDI(2)*P(I,2)+TDI(3)*P(I,3)) |
| 112 | DO 260 J=1,4-ILD |
| 113 | 260 TPR(J)=TPR(J)+SGN*P(I,J) |
| 114 | THP=SQRT(TPR(1)**2+TPR(2)**2+TPR(3)**2)/PS |
| 115 | IF(THP.GE.THPS+PARU(48)) GOTO 240 |
| 116 | |
| 117 | C...Save good axis. Try new initial axis until a number of tries agree. |
| 118 | IF(THP.LT.P(N+NP+ILD,4)-PARU(48).AND.ILG.LT.MIN(10,NC)) GOTO 230 |
| 119 | IF(THP.GT.P(N+NP+ILD,4)+PARU(48)) THEN |
| 120 | IAGR=0 |
| 121 | SGN=(-1.)**INT(RLU_HIJING(0)+0.5) |
| 122 | DO 270 J=1,3 |
| 123 | 270 P(N+NP+ILD,J)=SGN*TPR(J)/(PS*THP) |
| 124 | P(N+NP+ILD,4)=THP |
| 125 | P(N+NP+ILD,5)=0. |
| 126 | ENDIF |
| 127 | IAGR=IAGR+1 |
| 128 | 280 IF(IAGR.LT.MSTU(45).AND.ILG.LT.MIN(10,NC)) GOTO 230 |
| 129 | |
| 130 | C...Find minor axis and value by orthogonality. |
| 131 | SGN=(-1.)**INT(RLU_HIJING(0)+0.5) |
| 132 | P(N+NP+3,1)=-SGN*P(N+NP+2,2) |
| 133 | P(N+NP+3,2)=SGN*P(N+NP+2,1) |
| 134 | P(N+NP+3,3)=0. |
| 135 | THP=0. |
| 136 | DO 290 I=N+1,N+NP |
| 137 | 290 THP=THP+P(I,5)*ABS(P(N+NP+3,1)*P(I,1)+P(N+NP+3,2)*P(I,2)) |
| 138 | P(N+NP+3,4)=THP/PS |
| 139 | P(N+NP+3,5)=0. |
| 140 | |
| 141 | C...Fill axis information. Rotate back to original coordinate system. |
| 142 | DO 300 ILD=1,3 |
| 143 | K(N+ILD,1)=31 |
| 144 | K(N+ILD,2)=96 |
| 145 | K(N+ILD,3)=ILD |
| 146 | K(N+ILD,4)=0 |
| 147 | K(N+ILD,5)=0 |
| 148 | DO 300 J=1,5 |
| 149 | P(N+ILD,J)=P(N+NP+ILD,J) |
| 150 | 300 V(N+ILD,J)=0. |
| 151 | CALL LUDBRB_HIJING(N+1,N+3,THE,PHI,0D0,0D0,0D0) |
| 152 | |
| 153 | C...Select storing option. Calculate thurst and oblateness. |
| 154 | MSTU(61)=N+1 |
| 155 | MSTU(62)=NP |
| 156 | IF(MSTU(43).LE.1) MSTU(3)=3 |
| 157 | IF(MSTU(43).GE.2) N=N+3 |
| 158 | THR=P(N+1,4) |
| 159 | OBL=P(N+2,4)-P(N+3,4) |
| 160 | |
| 161 | RETURN |
| 162 | END |
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