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This page provides numerical table files for the
computation of CT18
next-to-leading order (NLO) and
next-to-next-to-leading order (NNLO) parton distribution
functions. They can be interpolated with the help
of a
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 CTEQ-TEA 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 pre-2012 PDF table files are partly incompatible with the new format. They can be interpolated by the 2012 interface, but without computing alpha_s. |
| PDF set | Description and links to the table files | Authors or main contact | References | Date | Additional resources |
| CT18 NNLO |
*General-purpose
NNLO central set + 58 eigenvector sets
(LHAPDF)
*PDF sets with a varied strong coupling alpha_s(M_Z) in the ranges 0.116-0.120 and 0.110-0.124 . The recommended 90% C.L. uncertainty estimate is 0.116 - 0.120. |
T.-J. Hou et. al.
|
arXiv:1912.10053 | 12/2019 |
|
| CT18 NLO |
*General-purpose
NLO central set + 58 eigenvector sets
(LHAPDF)
*PDF sets with a varied strong coupling alpha_s(M_Z) in the ranges 0.116-0.120 and 0.110-0.124 . The recommended 90% C.L. uncertainty estimate is 0.116 - 0.120. |
T.-J. Hou et. al. |
arXiv:1912.10053 |
12/2019 |
|
| CT18Z NNLO |
*General-purpose
NNLO central set + 58 eigenvector sets
(LHAPDF)
*PDF sets with a varied strong coupling alpha_s(M_Z) in the ranges 0.116-0.120 and 0.110-0.124 . The recommended 90% C.L. uncertainty estimate is 0.116 - 0.120. |
T.-J. Hou et. al.
|
arXiv:1912.10053 (to be replaced) |
12/2019 |
|
| CT18Z NLO |
*General-purpose
NLO central set + 58 eigenvector sets
(LHAPDF)
*PDF sets with a varied strong coupling alpha_s(M_Z) in the ranges 0.116-0.120 and 0.110-0.124 . The recommended 90% C.L. uncertainty estimate is 0.116 - 0.120. |
T.-J. Hou et. al. |
arXiv:1912.10053 |
12/2019 |
|
| CT18A NNLO |
*General-purpose
NNLO central set + 58 eigenvector sets
(LHAPDF)
*PDF sets with a varied strong coupling alpha_s(M_Z) in the ranges 0.116-0.120 and 0.110-0.124 . The recommended 90% C.L. uncertainty estimate is 0.116 - 0.120. |
T.-J. Hou et. al.
|
arXiv:1912.10053 |
12/2019 |
|
| CT18A NLO |
*General-purpose
NLO central set + 58 eigenvector sets
(LHAPDF)
*PDF sets with a varied strong coupling alpha_s(M_Z) in the ranges 0.116-0.120 and 0.110-0.124 . The recommended 90% C.L. uncertainty estimate is 0.116 - 0.120. |
T.-J. Hou et. al. |
arXiv:1912.10053 |
12/2019 |
|
| CT18X NNLO |
*General-purpose
NNLO central set + 58 eigenvector sets
(LHAPDF)
*PDF sets with a varied strong coupling alpha_s(M_Z) in the ranges 0.116-0.120 and 0.110-0.124 . The recommended 90% C.L. uncertainty estimate is 0.116 - 0.120. |
T.-J. Hou et. al.
|
arXiv:1912.10053 |
12/2019 |
|
| CT18X NLO |
*General-purpose
NLO central set + 58 eigenvector sets
(LHAPDF)
*PDF sets with a varied strong coupling alpha_s(M_Z) in the ranges 0.116-0.120 and 0.110-0.124 . The recommended 90% C.L. uncertainty estimate is 0.116 - 0.120. |
T.-J. Hou et. al. |
arXiv:1912.10053 |
12/2019 |