| 3c5d1739 |
1 | subroutine GRVevolve(xin,qin,pdf) |
| 2 | implicit real*8 (a-h,o-z) |
| 3 | include 'parmsetup.inc' |
| 4 | PARAMETER(ngrid=2) |
| 5 | PARAMETER (NPART=6, NX=68, NQ=27, NARG=2) |
| 6 | character*16 name(nmxset) |
| 7 | integer nmem(nmxset),ndef(nmxset),mmem |
| 8 | common/NAME/name,nmem,ndef,mmem |
| 9 | DIMENSION XXUVF(0:ngrid,NX,NQ), XXDVF(0:ngrid,NX,NQ), |
| 10 | + XXDEF(0:ngrid,NX,NQ), XXUDF(0:ngrid,NX,NQ), |
| 11 | 1 XXSF(0:ngrid,NX,NQ), XXGF(0:ngrid,NX,NQ), |
| 12 | + XUVF(NX,NQ), XDVF(NX,NQ), |
| 13 | + XDEF(NX,NQ), XUDF(NX,NQ), |
| 14 | 1 XSF(NX,NQ), XGF(NX,NQ), |
| 15 | + PARTON (NPART,NQ,NX-1), |
| 16 | 2 QS(NQ), XB(NX), XT(NARG), NA(NARG), ARRF(NX+NQ) |
| 17 | CHARACTER*80 LINE |
| 18 | dimension pdf(-6:6) |
| 19 | save |
| 20 | x=xin |
| 21 | q2=qin*qin |
| 22 | *...CHECK OF X AND Q2 VALUES : |
| 23 | IF ( (X.LT.0.99D-9) .OR. (X.GT.1.D0) ) THEN |
| 24 | WRITE(6,91) |
| 25 | 91 FORMAT (2X,'PARTON INTERPOLATION: X OUT OF RANGE') |
| 26 | STOP |
| 27 | ENDIF |
| 28 | IF ( (Q2.LT.0.799) .OR. (Q2.GT.1.01E6) ) THEN |
| 29 | WRITE(6,92) |
| 30 | 92 FORMAT (2X,'PARTON INTERPOLATION: Q2 OUT OF RANGE') |
| 31 | STOP |
| 32 | ENDIF |
| 33 | *...INTERPOLATION : |
| 34 | DO IQ=1,NQ |
| 35 | DO IX=1,NX |
| 36 | xuvf(ix,iq)=xxuvf(imem,ix,iq) |
| 37 | xdvf(ix,iq)=xxdvf(imem,ix,iq) |
| 38 | xdef(ix,iq)=xxdef(imem,ix,iq) |
| 39 | xudf(ix,iq)=xxudf(imem,ix,iq) |
| 40 | xsf(ix,iq)=xxsf(imem,ix,iq) |
| 41 | xgf(ix,iq)=xxgf(imem,ix,iq) |
| 42 | enddo |
| 43 | enddo |
| 44 | XT(1) = DLOG(X) |
| 45 | XT(2) = DLOG(Q2) |
| 46 | X1 = 1.- X |
| 47 | XV = X**0.5 |
| 48 | XS = X**(-0.2) |
| 49 | UV = FINT(NARG,XT,NA,ARRF,XUVF) * X1**3 * XV |
| 50 | DV = FINT(NARG,XT,NA,ARRF,XDVF) * X1**4 * XV |
| 51 | DE = FINT(NARG,XT,NA,ARRF,XDEF) * X1**7 * XV |
| 52 | UD = FINT(NARG,XT,NA,ARRF,XUDF) * X1**7 * XS |
| 53 | US = 0.5 * (UD - DE) |
| 54 | DS = 0.5 * (UD + DE) |
| 55 | SS = FINT(NARG,XT,NA,ARRF,XSF) * X1**7 * XS |
| 56 | GL = FINT(NARG,XT,NA,ARRF,XGF) * X1**5 * XS |
| 57 | * |
| 58 | |
| 59 | pdf(-6) = 0.0d0 |
| 60 | pdf(6) = 0.0d0 |
| 61 | pdf(-5) = 0.0d0 |
| 62 | pdf(5) = 0.0d0 |
| 63 | pdf(-4) = 0.0d0 |
| 64 | pdf(4) = 0.0d0 |
| 65 | pdf(-3) = ss |
| 66 | pdf(3) = ss |
| 67 | pdf(-2) = us |
| 68 | pdf(2) = uv+us |
| 69 | pdf(-1) = ds |
| 70 | pdf(1) = dv+ds |
| 71 | pdf(0) = gl |
| 72 | return |
| 73 | c |
| 74 | ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc |
| 75 | entry GRVread(nset) |
| 76 | c |
| 77 | c print *,'calling grvread' |
| 78 | read(1,*)nmem(nset),ndef(nset) |
| 79 | |
| 80 | read(1,93)xb |
| 81 | c print *,xb |
| 82 | read(1,93)qs |
| 83 | c print *,qs |
| 84 | 93 format(8e8.2) |
| 85 | c |
| 86 | do ng=0,nmem(nset) |
| 87 | c |
| 88 | READ(1,89) LINE |
| 89 | 89 FORMAT(A80) |
| 90 | c print *,line |
| 91 | DO 15 M = 1, NX-1 |
| 92 | DO 15 N = 1, NQ |
| 93 | READ(1,90) PARTON(1,N,M), PARTON(2,N,M), PARTON(3,N,M), |
| 94 | 1 PARTON(4,N,M), PARTON(5,N,M), PARTON(6,N,M) |
| 95 | 90 FORMAT (6(1PE10.3)) |
| 96 | 15 CONTINUE |
| 97 | * |
| 98 | *....ARRAYS FOR THE INTERPOLATION SUBROUTINE : |
| 99 | DO 10 IQ = 1, NQ |
| 100 | DO 20 IX = 1, NX-1 |
| 101 | XB0V = XB(IX)**0.5 |
| 102 | XB0S = XB(IX)**(-0.2) |
| 103 | XB1 = 1.-XB(IX) |
| 104 | xXUVF(ng,IX,IQ) = PARTON(1,IQ,IX) / (XB1**3 * XB0V) |
| 105 | xXDVF(ng,IX,IQ) = PARTON(2,IQ,IX) / (XB1**4 * XB0V) |
| 106 | xXDEF(ng,IX,IQ) = PARTON(3,IQ,IX) / (XB1**7 * XB0V) |
| 107 | xXUDF(ng,IX,IQ) = PARTON(4,IQ,IX) / (XB1**7 * XB0S) |
| 108 | xXSF(ng,IX,IQ) = PARTON(5,IQ,IX) / (XB1**7 * XB0S) |
| 109 | xXGF(ng,IX,IQ) = PARTON(6,IQ,IX) / (XB1**5 * XB0S) |
| 110 | 20 CONTINUE |
| 111 | xXUVF(ng,NX,IQ) = 0.E0 |
| 112 | xXDVF(ng,NX,IQ) = 0.E0 |
| 113 | xXDEF(ng,NX,IQ) = 0.E0 |
| 114 | xXUDF(ng,NX,IQ) = 0.E0 |
| 115 | xXSF(ng,NX,IQ) = 0.E0 |
| 116 | xXGF(ng,NX,IQ) = 0.E0 |
| 117 | 10 CONTINUE |
| 118 | NA(1) = NX |
| 119 | NA(2) = NQ |
| 120 | DO 30 IX = 1, NX |
| 121 | ARRF(IX) = DLOG(XB(IX)) |
| 122 | 30 CONTINUE |
| 123 | DO 40 IQ = 1, NQ |
| 124 | ARRF(NX+IQ) = DLOG(QS(IQ)) |
| 125 | 40 CONTINUE |
| 126 | |
| 127 | enddo |
| 128 | |
| 129 | return |
| 130 | c |
| 131 | ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc |
| 132 | entry GRValfa(alfas,qalfa) |
| 133 | call getnset(iset) |
| 134 | q2alfa = qalfa*qalfa |
| 135 | call GetOrderAsM(iset,iord) |
| 136 | nord=iord+1 |
| 137 | alfas=grvals(q2alfa,nord) |
| 138 | alfas = 4.0d0*3.14159d0*alfas |
| 139 | return |
| 140 | c |
| 141 | ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc |
| 142 | entry GRVinit(Eorder,Q2fit) |
| 143 | return |
| 144 | c |
| 145 | ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc |
| 146 | entry GRVpdf(mem) |
| 147 | imem = mem |
| 148 | return |
| 149 | c |
| 150 | 1000 format(5e13.5) |
| 151 | end |
| 152 | c |
| 153 | FUNCTION FINT(NARG,ARG,NENT,ENT,TABLE) |
| 154 | ********************************************************************* |
| 155 | * * |
| 156 | * THE INTERPOLATION ROUTINE (CERN LIBRARY ROUTINE E104) * |
| 157 | * * |
| 158 | ********************************************************************* |
| 159 | IMPLICIT DOUBLE PRECISION (A-H, O-Z) |
| 160 | DIMENSION ARG(5),NENT(5),ENT(10),TABLE(10) |
| 161 | DIMENSION D(5),NCOMB(5),IENT(5) |
| 162 | KD=1 |
| 163 | M=1 |
| 164 | JA=1 |
| 165 | DO 5 I=1,NARG |
| 166 | NCOMB(I)=1 |
| 167 | JB=JA-1+NENT(I) |
| 168 | DO 2 J=JA,JB |
| 169 | IF (ARG(I).LE.ENT(J)) GO TO 3 |
| 170 | 2 CONTINUE |
| 171 | J=JB |
| 172 | 3 IF (J.NE.JA) GO TO 4 |
| 173 | J=J+1 |
| 174 | 4 JR=J-1 |
| 175 | D(I)=(ENT(J)-ARG(I))/(ENT(J)-ENT(JR)) |
| 176 | IENT(I)=J-JA |
| 177 | KD=KD+IENT(I)*M |
| 178 | M=M*NENT(I) |
| 179 | 5 JA=JB+1 |
| 180 | FINT=0. |
| 181 | 10 FAC=1. |
| 182 | IADR=KD |
| 183 | IFADR=1 |
| 184 | DO 15 I=1,NARG |
| 185 | IF (NCOMB(I).EQ.0) GO TO 12 |
| 186 | FAC=FAC*(1.-D(I)) |
| 187 | GO TO 15 |
| 188 | 12 FAC=FAC*D(I) |
| 189 | IADR=IADR-IFADR |
| 190 | 15 IFADR=IFADR*NENT(I) |
| 191 | FINT=FINT+FAC*TABLE(IADR) |
| 192 | IL=NARG |
| 193 | 40 IF (NCOMB(IL).EQ.0) GO TO 80 |
| 194 | NCOMB(IL)=0 |
| 195 | IF (IL.EQ.NARG) GO TO 10 |
| 196 | IL=IL+1 |
| 197 | DO 50 K=IL,NARG |
| 198 | 50 NCOMB(K)=1 |
| 199 | GO TO 10 |
| 200 | 80 IL=IL-1 |
| 201 | IF(IL.NE.0) GO TO 40 |
| 202 | RETURN |
| 203 | END |
| 204 | |
| 205 | c FUNCTION ALPHAS (Q2, NAORD) |
| 206 | FUNCTION grvals (Q2, NAORD) |
| 207 | ********************************************************************* |
| 208 | * * |
| 209 | * THE ALPHA_S ROUTINE. * |
| 210 | * * |
| 211 | * INPUT : Q2 = scale in GeV**2 (not too low, of course); * |
| 212 | * NAORD = 1 (LO), 2 (NLO). * |
| 213 | * * |
| 214 | * OUTPUT: alphas_s/(4 pi) for use with the GRV(98) partons. * |
| 215 | * * |
| 216 | *******************************************************i************* |
| 217 | * |
| 218 | IMPLICIT DOUBLE PRECISION (A - Z) |
| 219 | INTEGER NF, K, I, NAORD |
| 220 | DIMENSION LAMBDAL (3:6), LAMBDAN (3:6), Q2THR (3) |
| 221 | * |
| 222 | *...HEAVY QUARK THRESHOLDS AND LAMBDA VALUES : |
| 223 | DATA Q2THR / 1.960, 20.25, 30625. / |
| 224 | DATA LAMBDAL / 0.2041, 0.1750, 0.1320, 0.0665 / |
| 225 | DATA LAMBDAN / 0.2994, 0.2460, 0.1677, 0.0678 / |
| 226 | * |
| 227 | *...DETERMINATION OF THE APPROPRIATE NUMBER OF FLAVOURS : |
| 228 | NF = 3 |
| 229 | DO 10 K = 1, 3 |
| 230 | IF (Q2 .GT. Q2THR (K)) THEN |
| 231 | NF = NF + 1 |
| 232 | ELSE |
| 233 | GO TO 20 |
| 234 | END IF |
| 235 | 10 CONTINUE |
| 236 | * |
| 237 | *...LO ALPHA_S AND BETA FUNCTION FOR NLO CALCULATION : |
| 238 | 20 B0 = 11.- 2./3.* NF |
| 239 | B1 = 102.- 38./3.* NF |
| 240 | B10 = B1 / (B0*B0) |
| 241 | IF (NAORD .EQ. 1) THEN |
| 242 | LAM2 = LAMBDAL (NF) * LAMBDAL (NF) |
| 243 | ALP = 1./(B0 * DLOG (Q2/LAM2)) |
| 244 | GO TO 1 |
| 245 | ELSE IF (NAORD .EQ. 2) then |
| 246 | LAM2 = LAMBDAN (NF) * LAMBDAN (NF) |
| 247 | B1 = 102.- 38./3.* NF |
| 248 | B10 = B1 / (B0*B0) |
| 249 | ELSE |
| 250 | WRITE (6,91) |
| 251 | 91 FORMAT ('INVALID CHOICE FOR ORDER IN ALPHA_S') |
| 252 | STOP |
| 253 | END IF |
| 254 | * |
| 255 | *...START VALUE FOR NLO ITERATION : |
| 256 | LQ2 = DLOG (Q2 / LAM2) |
| 257 | ALP = 1./(B0*LQ2) * (1.- B10*DLOG(LQ2)/LQ2) |
| 258 | * |
| 259 | *...EXACT NLO VALUE, FOUND VIA NEWTON PROCEDURE : |
| 260 | DO 2 I = 1, 6 |
| 261 | XL = DLOG (1./(B0*ALP) + B10) |
| 262 | XLP = DLOG (1./(B0*ALP*1.01) + B10) |
| 263 | XLM = DLOG (1./(B0*ALP*0.99) + B10) |
| 264 | Y = LQ2 - 1./ (B0*ALP) + B10 * XL |
| 265 | Y1 = (- 1./ (B0*ALP*1.01) + B10 * XLP |
| 266 | 1 + 1./ (B0*ALP*0.99) - B10 * XLP) / (0.02D0*ALP) |
| 267 | ALP = ALP - Y/Y1 |
| 268 | 2 CONTINUE |
| 269 | * |
| 270 | *...OUTPUT : |
| 271 | c 1 ALPHAS = ALP |
| 272 | 1 grvals = ALP |
| 273 | RETURN |
| 274 | END |
| 275 | |
| 276 | |
| 277 | |
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