# 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". *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *