Connected and disconnected sea partons from the CT18 parametrization of PDFs

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.