PDF/tpdf/testgam.F

   1 *
   2 * $Id$
   3 *
   4 * $Log$
   5 * Revision 1.1.1.3  1997/07/13 13:25:32  cernlib
   6 * Import version 7.09
   7 *
   8 * Revision 1.3  1997/07/02 15:03:11  pdflib
   9 * potential bug removed in GRSGALO
  10 *
  11 * Revision 1.2  1996/10/28 16:10:10  pdflib
  12 * PDFLIB new version 7.04
  13 *
  14 * Revision 1.1.1.1  1996/04/12 15:30:17  plothow
  15 * Version 7.01
  16 *
  17 *
  18 #include "pdf/pilot.h"
  19       PROGRAM TESTGAM
  20 C
  21 #include "pdf/impdp.inc"
  22       PARAMETER (LFLPRT = 2)
  23 #include "pdf/w5051p2.inc"
  24 #include "pdf/w5051p7.inc"
  25 #include "pdf/w50510.inc"
  26 #include "pdf/w50511.inc"
  27 #include "pdf/w50512.inc"
  28 #include "pdf/w50513.inc"
  29 #include "pdf/w50516.inc"
  30 #include "pdf/w50517.inc"
  31 #include "pdf/w505110.inc"
  32 #include "pdf/w505120.inc"
  33 #include "pdf/w505122.inc"
  34 C
  35 #include "pdf/expdp.inc"
  36      +       DX,DQ,DUV,DDV,DUB,DDB,DSB,DCB,DBB,DTB,DGL,
  37      +       DQ2,DP2
  38 #include "pdf/expdp.inc"
  39      +               XI(32),WI(32),XX(33)
  40       COMMON/W5051I9/XI,WI,XX,NTERMS
  41 #include "pdf/expdp.inc"
  42      +       XV(3),ZQ(5)
  43       CHARACTER*20 PARM(NCHDIM)
  44 #include "pdf/expdp.inc"
  45      +       VAL(NCHDIM)
  46 C
  47       DATA XV/0.05D0,0.50D0,0.95D0/
  48       DATA ZQ/10.D0,100.D0,1000.D0,1.D+4,5.5D+5/
  49       DATA P2/5./
  50       DATA IP2/0/
  51       DATA FLAV/4.D0/
  52       DATA ALQED/137.D0/
  53       DATA ICALL/0/
  54 C
  55       N6 = L6
  56       IFLPRT = LFLPRT
  57 C
  58 C*****adjustment of the VDM contribution*******************************
  59       KA=1.
  60 C*****mass of the charm quark******************************************
  61       CM=1.41
  62 C*****CHARME=0. -> no charm contribution ******************************
  63       CHARME=1.
  64 C
  65       PI=4.D0*ATAN(1.D0)
  66       PI2=PI**2
  67       CF=4.D0/3.D0
  68       NF=INT(FLAV+0.1D0)
  69       IF(NF.EQ.0) NF=3
  70       FLAVOR=FLAV
  71       B0=11.D0-2.D0*NF/3.D0
  72       B1=102.D0-38.D0*NF/3.D0
  73       CCOEG=2.D0/9.D0
  74 C      IF(NF.EQ.4) CCOEG=5.D0/18.D0
  75 C      COEG=2.D0*FLAVOR*CCOEG
  76       COEG=2.D0*FLAVOR*CCOEG
  77       CALL WATE32
  78 C
  79 C First call to PDFSET to initialize COMMON/W505120/
  80       PARM(1) = 'Init0'
  81       VAL(1)  = 0.D0
  82       CALL PDFSET(PARM,VAL)
  83 C.
  84 C Test new PDFLIB versions (4.0 or bigger) for Photons only
  85       NPTYPE = 3
  86          DO KGRO = 1,NGRMAX
  87             IF(NPGSMX(NPTYPE,KGRO) .EQ. 0) GOTO 500
  88             DO ISET=1,NPGSMX(NPTYPE,KGRO)
  89                WRITE (N6,*) ' ==========================================
  90      +================================================================='
  91                FIRST=.TRUE.
  92                PARM(1) = 'Nptype'
  93                VAL(1)  = NPTYPE
  94                PARM(2) = 'Ngroup'
  95                VAL(2)  = KGRO
  96                PARM(3) = 'Nset'
  97                VAL(3)  = ISET
  98                CALL PDFSET(PARM,VAL)
  99 C
 100          ICALL = 0
 101          Q02 = Q2MIN
 102          OWLAM = QCDL4
 103          OWLAM2=OWLAM**2
 104          IORD = LO - 1
 105 *
 106       DO 100 J=3,3
 107       Q2=Q02
 108       IF(J.GE.2) Q2=ZQ(J-1)
 109       XTH=1.D0/(1.D0+4.D0*CM**2/Q2)
 110       ALQ2= LOG(Q2/OWLAM2)
 111       ALFPI= 2.D0 /(B0*ALQ2+B1* LOG(ALQ2)/B0)
 112       DO 70 K=1,3
 113       X=XV(K)
 114       DX = X
 115       Q = SQRT(Q2)
 116       DQ = Q
 117       DQ2 = Q2
 118       DP2 = P2
 119       IP = IP2
 120       CUT=1.
 121       IF(CHARME.LT.0.5) CUT=0.
 122       CUTG=1.
 123       IF(X.GT.XTH) CUT=0.
 124       CALL STRUCTP(DX,DQ2,DP2,IP,
 125      +             DUV,DDV,DUB,DDB,DSB,DCB,DBB,DTB,DGL)
 126       UB =DUB
 127       DB =DDB
 128       SB =DSB
 129       CB =DCB
 130       GL =DGL
 131       F2=(4.D0*  DUB   +  DDB   +  DSB)/9.D0
 132       F2C=4.D0/9.D0*(FLAVOR-3.D0)*DCB*CUT
 133       F2=F2+F2C
 134       IF(ICALL.EQ.0) THEN
 135         ICALL = 1
 136         WRITE (N6,1000) Q02,P2,CHARME,CUT,IORD,OWLAM,FLAV
 137  1000   FORMAT(1X,' Q02= ',F7.3,'   P2= ',F7.3,
 138      +               '   CHARM= ',F3.1,'   CUT= ',F3.1,
 139      +               '   IORD= ',I2,'   LAMBDA=',F7.4,'   NF = ',F5.2)
 140         ENDIF
 141       IF (K.EQ.1) THEN
 142         WRITE (N6,1001) Q2
 143  1001   FORMAT(/,'  Q2=  ',E10.3,' GEV**2')
 144         WRITE(N6,1002)
 145  1002   FORMAT(/,4X,' X',6X,'X*UB  ',6X,'X*DB  ',6X,'X*SB  ',6X,'X*CB  '
 146      +                  ,6X,'X*GL',8X,' F2 ',6X,' F2/ALPHA'
 147      +                            ,5X,' F2C ',5X,' F2C/ALPHA')
 148       ENDIF
 149       IF(IORD)13,13,14
 150 14    CONTINUE
 151       AL=0.5D0*ALFPI
 152       AL1= LOG(1.D0-X)
 153       XQ=F2+F2*AL*CF*(-9.D0-2.D0*PI2/3.D0+AL1*(-3.D0+2.D0*AL1))
 154 C     WRITE(N6,1111) X,Q,F2,AL1,XQ
 155 C1111 FORMAT(1X,' X,F2 = ',5E13.5)
 156       XM=1.-X
 157       XP=1.+X
 158       DIS2=(XM**2-4.*X*XM*CM**2/Q2)*CUT
 159       DIS=SQRT(DIS2)
 160       YP=(XP+DIS)/2.
 161       YM=(XP-DIS)/2.
 162       CUTY=1.
 163       DO 81 I=1,NTERMS
 164       Y=0.5D0*(1.D0-X)*XI(I)+0.5D0*(1.D0+X)
 165       XY=X/Y
 166       AL1= LOG(1.D0-Y)
 167       DX = XY
 168       CALL STRUCTP(DX,DQ2,DP2,IP,
 169      +             DUV,DDV,DUB,DDB,DSB,DCB,DBB,DTB,DGL)
 170       XQQ=(4.D0*  DUB   +  DDB   +  DSB)/9.D0
 171       XQQ=XQQ+4.D0/9.D0*(FLAVOR-3.D0)*DCB*CUT*CUTY
 172       F2A=F2+F2C*(CUTY-1.)
 173  6    C22=CF*(6.D0+4.D0*Y-2.D0*(1.D0+Y*Y)/
 174      +          (1.D0-Y)* LOG(Y)-2.D0*(1.D0+Y)*AL1)
 175       C23=CF*(-3.D0+4.D0*AL1)/(1.D0-Y)
 176       COEGM=COEG+(8./9.)*(FLAVOR-3.)*CUTG*CUT
 177       CG2=(-1.D0+8.D0*Y*(1.D0-Y)+(1.D0-2.D0*Y+2.D0*Y*Y)*
 178      +                   LOG(1.D0/Y-1.D0))*COEGM
 179       XQ=XQ +0.5D0*(1.D0-X)*WI(I)*AL*(C22*XQQ+C23*(XQQ- F2A))
 180       XQ=XQ +0.5D0*(1.D0-X)*WI(I)*AL*CG2*(DGL+KA*GL)
 181 C     WRITE(N6,1112) Y,AL1,C22,C23,CG2,XQQ,XQ
 182 C1112 FORMAT(1X,' Y,C22 = ',7E13.5)
 183       CUTG=1.
 184    81 CUTY=1.
 185       COE3=3.D0*3.D0*(2.D0/27.D0)*(1.D0/(2.D0*PI*ALQED))*2.D0
 186       COE4=3.D0*(34.D0/81.D0)*(1.D0/(2.D0*PI*ALQED))*2.D0
 187       IF(NF.EQ.3) COE4=COE3
 188          F2=XQ+COE4*(8.D0*X*(1.D0-X)-1.D0+(1.D0-2.D0*X+2.D0*X*X)*
 189      +            LOG(1.D0/X-1.D0))*X
 190          F2M=XQ+COE3*(8.D0*X*(1.D0-X)-1.D0+(1.D0-2.D0*X+2.D0*X*X)*
 191      +            LOG(1.D0/X-1.D0))*X
 192       CMS=CM**2
 193       SC=Q2*(1.D0-X)/X
 194       BE=4.*CMS/SC
 195       IF(BE.GE.1.) WCM=0.
 196       IF(BE.GE.1.) GO TO 91
 197       SQ=SQRT(1.-BE)
 198       A1=((1.D0+SQ)/2.D0)**2
 199       A2=(1.D0-X)/X
 200       WCM=(8.D0*(1.D0-X)*X-1.D0)*SQ+(X**2+(1.D0-X)**2)*LOG(A1*A2)
 201       WCM=3.D0*(4.D0/9.D0)/(PI*ALQED)*X*WCM
 202 91    CONTINUE
 203       F2M=F2M+(4.D0/9.D0)*(FLAVOR-3.D0)*WCM*CUT
 204          F2C=F2M
 205    13    F2N=F2*ALQED
 206          F2CN=F2C*ALQED
 207          WRITE(N6,1003)X,UB,DB,SB,CB,GL,F2,F2N,F2C,F2CN
 208  1003    FORMAT(1X,' ',F6.3,9E12.4)
 209    70    CONTINUE
 210   100    CONTINUE
 211        ENDDO
 212        WRITE(N6,*) '  '
 213   500  CONTINUE
 214       ENDDO
 215       STOP
 216       END