PARAMETRIZATIONS OF THE REAL PHOTON
Application of the CJK(L)
parametrizations in processes other than DIS_egamma - a new, consistent approach
A new consistent approach for application of the ACOT(chi) type heavy-quark
densities have been proposed in P.Jankowski's PhD thesis, see chapter on
calculation of the gamma-gamma -> h/bar h + X cross-section
application.ps.gz
Parametrizations of the parton densities necessary in this approach are
provided:
CJKL LO '02
The General Variable Flavour Number Scheme type LO model. Detailed description
in:
F.Cornet, P.Jankowski, M.Krawczyk and A.Lorca
"A New 5 Flavour LO Analysis and Parametrization of Parton Distributions
in the Real Photon"
Phys.Rev.D68:014010,2003; hep-ph/0212160
CJKL.ps.gz
| The PDF FORTRAN routine CJKL.f |
Analytic parametrization of the DGLAP evolution results.
There are three options in the routine. They allow to calculate:
1) only light parton (gl,d,u,s) distributions
2) parton (gl,d,u,s,c,b) distributions
3) parton (gl,d,u,s,c,b) distributions and F2^gamma function (calculated
according to Eq. (22) of the article)
Last option is the most computer time consuming one.
For the detailed description of the use of the routine see its header.
Collection of the experimental F2^gamma data used in the fit. f2datdesc.ps
CJK LO '03
Two Fixed Flavour Number Scheme type LO models.
Two General Variable Flavour Number Scheme type LO models.
Detailed description in
F.Cornet, P.Jankowski and M.Krawczyk
"CJK- Improved LO Parton Distributions in
the Real Photon and Their Experimental Uncertainties"
Nucl.Phys.Proc.Suppl.126:28-37,2004; hep-ph/0310029
phot03.pdf.gz
and in
F.Cornet, P.Jankowski and M.Krawczyk
"CJK-Improved 5 Flavour LO parton Distributions in the Real Photon"
hep-ph/0404244
CJKLO.ps.gz
CJK 1 & 2 LO programs contain additional parametrizations of the test parton
densities which allow for calculation of uncertainties of any observable
X(parton densities). See
P.Jankowski
"Uncertainties of the CJK 5 Flavour LO Parton Distributions in the Real Photon"
hep-ph/0312056
UNCERT.ps.gz
Grid parametrizations of the DGLAP evolution results.
Files gzip compressed and tar archived
There are two options in the FFNS LO routines. They allow to calculate:
1) only light parton (gl,d,u,s) distributions
2) light parton (gl,d,u,s) distributions and F2^gamma functions
There are three options in the CJK LO routines. They allow to calculate:
1) only light parton (gl,d,u,s) distributions
2) all parton (gl,d,u,s,c,b) distributions
3) parton (gl,d,u,s,c,b) distributions and F2^gamma functions
CJK parametrizations include sets of four S+ and S- parametrizations allowing
for calculation of uncertainties of any physical observables depending on
real photon parton densities (see details in the article).
For the detailed description of the use of the routines see their headers.
Here we compared the results of the DGLAP evolution programs for our four
models with their grid parametrizations.
Collection of the experimental F2^gamma data used in the fits. This time we
excluded the TPC/2gamma Collaboration results from fits. f2datdesc.ps
CJK NLO '04
Two Fixed Flavour Number Scheme type NLO models.
One General Variable Flavour Number Scheme type NLO model.
Detailed description in:
F.Cornet, P.Jankowski and M.Krawczyk
"A New 5 Flavour NLO Analysis and Parametrizations of Parton Distributions of
the Real Photon"
hep-ph/0404063
CJKNLO.ps.gz
Grid parametrizations of the DGLAP evolution results.
Files gzip compressed and tar archived
There are two options in the CJK NLO routine. They allow to calculate:
1) only light parton (gl,d,u,s) distributions
2) all parton (gl,d,u,s,c,b) distributions
For the detailed description of the use of the routines see their headers.
Here we compared the results of the DGLAP evolution programs for our four
models with their grid parametrizations.
If You have any question or find a bug in a routine do not hesitate but
please write to:
pjank@fuw.edu.pl
ellis.ppt
power.tar.gz