5 * Revision 1.1.1.2 1996/10/30 08:28:44 cernlib
8 * Revision 1.1.1.1 1996/04/12 15:29:24 plothow
12 #include "pdf/pilot.h"
13 SUBROUTINE GRVPIHO (ZX,ZQ,ZUV,ZDV,ZUDB,ZSB,ZCB,ZBB,ZTB,ZGL)
14 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
16 * G R V - P I O N - P A R A M E T R I Z A T I O N S *
18 * FOR A DETAILED EXPLANATION SEE : *
19 * M. GLUECK, E.REYA, A.VOGT: DO-TH 91/16 *
21 * THE PARAMETRIZATIONS ARE FITTED TO THE PARTON DISTRIBUTIONS *
22 * FOR Q ** 2 BETWEEN MU ** 2 (= 0.25 / 0.30 GEV ** 2 IN LO *
23 * / HO) AND 1.E8 GEV ** 2 AND FOR X BETWEEN 1.E-5 AND 1. *
24 * REGIONS, WHERE THE DISTRIBUTION UNDER CONSIDERATION IS NEG- *
25 * LIGIBLE, I.E. BELOW ABOUT 1.E-4, WERE EXCLUDED FROM THE FIT. *
27 * HEAVY QUARK THRESHOLDS Q(H) = M(H) : *
28 * M(C) = 1.5, M(B) = 4.5, M(T) = 100 GEV *
30 * CORRESPONDING LAMBDA(F) VALUES FOR F ACTIVE FLAVOURS : *
31 * LO : LAMBDA(3) = 0.232, LAMBDA(4) = 0.200, *
32 * LAMBDA(5) = 0.153, LAMBDA(6) = 0.082 GEV *
33 * HO : LAMBDA(3) = 0.248, LAMBDA(4) = 0.200, *
34 * LAMBDA(5) = 0.131, LAMBDA(6) = 0.053 GEV *
36 * HO DISTRIBUTION REFER TO THE MS-BAR SCHEME OF BARDEEN ET AL. *
38 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
41 #include "pdf/expdp.inc"
42 + ZX,ZQ,ZUV,ZDV,ZUDB,ZSB,ZCB,ZBB,ZTB,ZGL
49 S = ALOG (ALOG(Q2/LAM2) / ALOG(MU2/LAM2))
53 NV = 0.456 + 0.150 * DS + 0.112 * S - 0.019 * S2
54 AKV = 0.505 - 0.033 * S
55 AGV = 0.748 - 0.669 * DS - 0.133 * S
56 DV = 0.365 + 0.197 * DS + 0.394 * S
57 VAP = GRVFVP (X, NV, AKV, AGV, DV)
63 AKG = 0.437 - 0.689 * DS
65 AGG = 1.324 - 0.441 * DS - 0.130 * S
66 BGG = -0.955 + 0.259 * S
67 CG = 1.075 - 0.302 * S
68 DG = 1.158 + 1.229 * S
70 ESG = 2.604 + 0.165 * S
71 GLP = GRVFGP(X,S, ALG, BEG, AKG, BKG, AGG, BGG, CG, DG, EG, ESG)
73 C...X * QBAR (SU(3)-SYMMETRIC SEA) :
77 AKS = -0.350 + 0.806 * S
80 DS = 2.273 + 1.438 * S
81 EST = 3.214 + 1.545 * S
82 ESS = 1.341 + 1.938 * S
83 QBP = GRVFQBP (X, S, SL, ALS, BES, AKS, AGS, BS, DS, EST, ESS)
86 C...X * CBAR = X * C :
93 DC = 1.318 + 0.584 * S
95 ESC = 1.496 + 1.010 * S
96 CBP = GRVFQBP (X, S, SC, ALC, BEC, AKC, AGC, BC, DC, EC, ESC)
98 C...X * BBAR = X * B :
102 AKB = 0.0 - 0.172 * S
105 DB = 1.447 + 0.485 * S
106 EB = 4.79 + 1.164 * S
107 ESB = 1.724 + 2.121 * S
108 BBP = GRVFQBP (X, S, SBO, ALB, BEB, AKB, AGB, BBO, DB, EB, ESB)
110 C...X * TBAR = X * T :