GJR DYNAMICAL PARTON DISTRIBUTIONS

2009 parton distribution programmes

JR09FFNNLO.f plus the grid file JR09FFNNLO.grd and the routine dfint.f
NNLO-MSbar (including uncertainties) dynamical parton distribution functions of the nucleon
generated in the FFNS (Fixed Flavor Number Scheme) as presented in Phys. Rev. D79 (2009) 074023
(arXiv:0810.4274).Note that the scale dependence of the running coupling constant is governed by a
variable number of active flavors as discussed in Mod. Phys. Lett. A22 (2007) 351 (hep-ph/0608276).

JR09VFNNLO.f plus the grid file JR09VFNNLO.grd and the routine dfint.f
NNLO-MSbar (including uncertainties) dynamical parton distribution functions of the nucleon
generated in the VFNS (Variable Flavor Number Scheme) as presented in Phys. Rev. D80 (2009) 114011
(arXiv:0909.1711).

The respective gzipped tar files JR09FFNNLO.tar.gz and JR09VFNNLO.tar.gz
contain the code, grids, Makefiles and the example programmes : (FF)example.f and (VF)example.f

2008 parton distribution programmes

GJR08FFNS.f plus the grid file GJR08FFNS.grd and the routine dfint.f
LO, NLO-MSbar (including uncertainties and the light- as well as the fixed-order
heavy-quark-predictions for F2p ) and NLO-DIS dynamical parton distribution functions
of the nucleon generated in the FFNS (Fixed Flavor Number Scheme) as presented in
Eur. Phys. J. *C53*(2008) 355 (also arXiv:0709.0614). Note that the scale dependence
of the running coupling constant is governed by a variable number of active flavors as
discussed in Mod. Phys. Lett. *A22* (2007) 351 (also hep-ph/0608276).

GJR08VFNS.f plus the grid file GJR08VFNS.grd and the routine dfint.f
LO and NLO-MSbar (including uncertainties) dynamical parton distribution functions
of the nucleon generated in the VFNS (Variable Flavor Number Scheme) as presented
in Phys. Lett. *B664* (2008) 133 (also arXiv:0709.0614).

The respective gzipped tar files GJR08FFNS.tar.gz and GJR08VFNS.tar.gz
contain the code, grids, Makefiles and the example programmes : (FF)example.f and (VF)example.f

GRV PARTON DISTRIBUTIONS

1998 parton distribution programmes

grv98.f
with grids for the PARTON routine:
iset = 1 grv98lo.grid (LO)
iset = 2 grv98nlm.grid (NLO - MSbar)
iset = 3 grv98nld.grid (NLO - DIS)
and for the F2 routine:
iset = 1 grv98lof.grid (LO)
iset = 2 grv98nlf.grid (NLO)
plus a simple example programme: grvsimp.f

grv98.uu is a uuencoded gzipped tar file of all of the above.

UPDATE (19 AUG 2014): slight differences have been found between LHAPDF 5.9.1, which uses grv98lo.grid, and PDFLIB from CERNLIB. In particular, LHAPDF 5.9.1 (and the standalone code) gives a kink at x values around 0.4 in the ubar and dbar distributions plotted against x. Alternative grv98lo_pdflib.grid and GRV98lo_pdflib.LHgrid files have been produced from the PDFLIB source for use with grv98.f and LHAPDF 5.9.1, respectively.

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * G R V - P R O T O N - P A R A M E T R I Z A T I O N S * * * * 1998 UPDATE * * * * For a detailed explanation see * * M. Glueck, E. Reya, A. Vogt : * * hep-ph/9806404 = DO-TH 98/07 = WUE-ITP-98-019 * * (To appear in Eur. Phys. J. C) * * * * This package contains subroutines returning the light-parton * * distributions in NLO (for the MSbar and DIS schemes) and LO; * * the respective light-parton, charm, and bottom contributions * * to F2(electromagnetic); and the scale dependence of alpha_s. * * * * The parton densities and F2 values are calculated from inter- * * polation grids covering the regions * * Q^2/GeV^2 between 0.8 and 1.E6 ( 1.E4 for F2 ) * * x between 1.E-9 and 1. * * Any call outside these regions stops the program execution. * * * * At Q^2 = MZ^2, alpha_s reads 0.114 (0.125) in NLO (LO); the * * heavy quark thresholds, QH^2 = mh^2, in the beta function are * * mc = 1.4 GeV, mb = 4.5 GeV, mt = 175 GeV. * * Note that the NLO alpha_s running is different from GRV(94). * * * * Questions, comments etc to: avogt@physik.uni-wuerzburg.de * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

1994 parton distribution programmes

grv94.f
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * G R V - P R O T O N - P A R A M E T R I Z A T I O N S * * * * 1994 UPDATE * * * * FOR A DETAILED EXPLANATION SEE * * M. GLUECK, E.REYA, A.VOGT : * * DO-TH 94/24 = DESY 94-206 * * (TO APPEAR IN Z. PHYS. C) * * * * THE PARAMETRIZATIONS ARE FITTED TO THE EVOLVED PARTONS FOR * * Q**2 / GEV**2 BETWEEN 0.4 AND 1.E6 * * X BETWEEN 1.E-5 AND 1. * * LARGE-X REGIONS, WHERE THE DISTRIBUTION UNDER CONSIDERATION * * IS NEGLIGIBLY SMALL, WERE EXCLUDED FROM THE FIT. * * * * HEAVY QUARK THRESHOLDS Q(H) = M(H) IN THE BETA FUNCTION : * * M(C) = 1.5, M(B) = 4.5 * * CORRESPONDING LAMBDA(F) VALUES IN GEV FOR Q**2 > M(H)**2 : * * LO : LAMBDA(3) = 0.232, LAMBDA(4) = 0.200, * * LAMBDA(5) = 0.153, * * NLO : LAMBDA(3) = 0.248, LAMBDA(4) = 0.200, * * LAMBDA(5) = 0.131. * * THE NUMBER OF ACTIVE QUARK FLAVOURS IS NF = 3 EVERYWHERE * * EXCEPT IN THE BETA FUNCTION, I.E. THE HEAVY QUARKS C,B,... * * ARE NOT PRESENT AS PARTONS IN THE Q2-EVOLUTION. * * * * NLO DISTRIBUTIONS ARE GIVEN IN MS-BAR FACTORIZATION SCHEME * * (SUBROUTINE GRV94HO) AS WELL AS IN THE DIS SCHEME (GRV94DI), * * THE LEADING ORDER PARAMETRIZATION IS PROVIDED BY "GRV94LO". * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *