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[u/mrichter/AliRoot.git] / 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