Connected and disconnected sea partons from the CT18 parametrization of PDFs

Tie Jiun Hou, Mengshi Yan, Jian Liang, Keh Fei Liu, C. P. Yuan

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1 Scopus citations


The separation of the connected and disconnected sea partons, which were uncovered in the Euclidean path-integral formulation of the hadronic tensor, is accommodated with an extended parametrization of the nonperturbative parton distribution functions in the CT18 global analysis. This is achieved with the help of the distinct small x behaviors of these two sea partons and the constraint from the lattice calculation of the ratio of the strange momentum fraction to that of the ū or d¯ in the disconnected insertion. The whole dataset of CT18 is used in this CT18CS fit. The impact of the recent SeaQuest data on the d¯(x)-ū(x) distribution of CT18CS is also discussed. The separate momentum fractions for the valence, the connected sea and disconnected sea of u and d, the strange and the gluon partons are presented at the input scale μ=1.3 GeV for the first time. They can be compared term-by-term with systematic error controlled lattice calculations.

Original languageEnglish
Article number096008
JournalPhysical Review D
Issue number9
StatePublished - Nov 1 2022

Bibliographical note

Funding Information:
The authors are indebted to J. C. Peng, J. W. Qiu, and Y. B. Yang for insightful discussions. The work of K.-F. L. is partially support by the U.S. DOE Grant No. DE-SC0013065 and DOE Grant No. DE-AC05-06OR23177 which is within the framework of the TMD Topical Collaboration. This research used resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. This work used Stampede time under the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation Grant No. ACI-1053575. We also thank the National Energy Research Scientific Computing Center (NERSC) for providing HPC resources that have contributed to the research results reported within this paper. We acknowledge the facilities of the USQCD Collaboration used for this research in part, which are funded by the Office of Science of the U.S. Department of Energy. The work of J. L. is partially supported by the National Science Foundation of China (NSFC) under Grant No. 12175073. The work of C.-P. Y. is partially supported by the U.S. National Science Foundation under Grant No. PHY-2013791. C.-P. Y. is also grateful for the support from the Wu-Ki Tung endowed chair in particle physics.

Publisher Copyright:
© 2022 authors.

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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