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arXiv · 2206.02431

Connected and Disconnected Sea Partons from CT18 Parametrization of PDFs

Tie-Jiun Hou·Mengshi Yan·Jian Liang·Keh-Fei Liu·C. -P. Yuan
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Abstract

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 alternative parametrization of the non-perturbative parton distribution functions in the CT18 global analysis. This is achieved with the help of the distinct small $x$ behaviours of these two sea partons and the constraint from the lattice calculation of the ratio of the strange momentum fraction to that of the $\bar u$ or $\bar d$ in the disconnected insertion. The whole dataset of CT18 is used in this CT18CS fit. The impact of the recent SeaQuest data on the $\bar{d}(x)-\bar{u}(x)$ 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 $μ=1.3$ GeV for the first time. They can be compared term-by-term with systematic error controlled lattice calculations.

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Tie-Jiun Hou, Mengshi Yan, Jian Liang, Keh-Fei Liu, C. -P. Yuan. 2022-11-01. Connected and Disconnected Sea Partons from CT18 Parametrization of PDFs. https://doi.org/10.1103/physrevd.106.096008

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