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arXiv · 2211.11064

Impact of Lattice Strangeness Asymmetry Data in the CTEQ-TEA Global Analysis

Tie-Jiun Hou·Huey-Wen Lin·Mengshi Yan·C. -P. Yuan
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Abstract

We study the impact of lattice data on the determination of the strangeness asymmetry distribution $s_-(x) \equiv s(x) - {\bar s}(x)$ in the general CTEQ-TEA global analysis of parton distribution functions (PDFs) of the proton. Firstly, we find that allowing a nonvanishing $s_-(x)$, at the initial $Q_0=1.3$~GeV scale, in a global PDF analysis leads to a CT18As fit with similar quality to CT18A. Secondly, including the lattice data in the CT18As\_Lat fit greatly reduces the $s_-$-PDF error band size in the large-$x$ region. To further reduce its error would require more precise lattice data, extended to smaller $x$ values. We take ATLAS 7 TeV $W$ and $Z$ production data, SIDIS di-muon production data, $F_3$ structure function data, E866 NuSea data, and E906 SeaQuest data as examples to illustrate the implication of CT18As and CT18As\_Lat fits. The parametrization dependence for PDF ratio $(s+\bar{s})/(\bar{u}+\bar{d})(x)$ is analyzed with CT18As2 and CT18As2\_Lat fits as results.

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Tie-Jiun Hou, Huey-Wen Lin, Mengshi Yan, C. -P. Yuan. 2022-11-20. Impact of Lattice Strangeness Asymmetry Data in the CTEQ-TEA Global Analysis. https://doi.org/10.1103/physrevd.107.076018

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