This page provides
numerical table files for the computation of CT10
nexttoleading order (NLO) and nexttonexttoleading
order (NNLO) parton distribution functions. They
can be interpolated with the help of a NEW standalone Fortran interface
and demonstration program,
as well as the tables with interpolated values of the
QCD coupling alpha_s and PDFs. (A simple C++ interface for the CTEQTEA PDFs with CTEQ6.6 or later can be found here.) ATTENTION: The format of the PDF table files (with the extension .pds) and the Fortran interface were revised in 2012 to provide interpolation of the energy dependence of the QCD running coupling alpha_s using a table of alpha_s values stored inside the .pds file. The pre2012 PDF table files are partly incompatible with the new format. They can be interpolated by the 2012 interface, but without computing alpha_s. All CT10 NLO and NNLO table files have been converted into the new format. If you are looking for the 2010 version of the interface and table files, click here. Naming conventions for the NLO and NNLO sets. In comparisons of the NLO and NNLO calculations, the CT10 NNLO set can be used as a counterpart for either the CT10 NLO set or the CT10W NLO set. The CT10 NNLO set includes a part of the data sample for D0 Run2 W charge asymmetry that is included in the CT10W NLO fit, but is not included in the CT10 NLO fit. The W charge asymmetry data primarily modifies the slope of the ratio d(x,Q)/u(x,Q) at large momentum fractions x. Apart from the difference in the d/u ratio at x>0.1, the CT10 NLO and CT10W NLO PDFs provide very similar predictions. 
PDF set 
Description and links to the table files 
Authors or main contact 
References 
Date 
Additional resources 
CT10H NNLO 
* Four extreme sets of CT10H PDFs; for studying gg > H cross sections at the LHC; at NNLO  S. Dulat et. al.  arXiv:1310.7601  10/2013 

CT10C NNLO 
* Four
sets of CT10 intrinsic charm PDFs; at NNLO 
S. Dulat et. al. 
arXiv:1309.0025  08/2013 

CT10 NNLO  *Generalpurpose
NNLO central set
+ 50 eigenvector sets *PDF sets with a varied strong coupling alpha_s(M_Z) in the ranges 0.1160.120 and 0.1100.130. The recommended 90 % C.L. uncertainty estimate is 0.116  0.120. 
P. Nadolsky
et al. 
arXiv:1302.6246  05/2012 
Additional figures 
CT10 NLO  *Generalpurpose
NLO central set +
52 eigenvector sets *PDF sets with a varied strong coupling alpha_s(M_Z) in the ranges 0.1160.120 and 0.1120.127. The recommended 90 % C.L. uncertainty estimate is 0.116  0.120. 
H.L. Lai et al.  arXiv:1007.2241  07/2010 
Additional figures 
CT10W NLO 
*Generalpurpose
NLO central set +
52 eigenvector sets *PDF sets with a varied strong coupling alpha_s(M_Z) in the ranges 0.1160.120 and 0.1120.127. The recommended 90 % C.L. uncertainty estimate is 0.116  0.120. 
H.L. Lai et al.  arXiv:1007.2241  07/2010  
CT10F3 CT10F4 CT10WF3 CT10WF4 NLO 
CT10/CT10W PDF sets in 3flavor and 4flavor schemes, for two alternative choices of alpha_s(Q) in these schemes. These PDF sets are obtained by evolving the CT10(W) NLO parametrizations (obtained in the variable flavor scheme) from the initial scale Q_{0} to higher Q values using the 3flavor or 4flavor DGLAP evolution. See README in the .zip file for further explanations.  H.L. Lai et al.  arXiv:1007.2241  Updated on 05/2012 
Depository of CT10 PDFs, 2010 version
Previous families of PDFs: CTEQ6CTEQ6.6
Web support: Pavel Nadolsky
(nadolsky at smu.edu)
C.P. Yuan (yuan at pa.msu.edu)
This website is partially supported by the U.S. National Science Foundation under Grant No. PHY0855561.