Impact of lattice strangeness asymmetry data in the CTEQ-TEA global analysis
Impact of lattice strangeness asymmetry data in the CTEQ-TEA global analysis
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DOI：
10.1103/physrevd.107.076018
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发表时间：
2022-11
影响因子：
5
通讯作者：
T. Hou;Huey-Wen Lin;Mengshi Yan;C. Yuan
中科院分区：
文献类型：
--
作者：
T. Hou;Huey-Wen Lin;Mengshi Yan;C. Yuan
研究了在质子部分子分布函数的CTEQ-TEA整体分析中，晶格数据对奇异不对称分布s_-（x）\equiv s（x）- {\bar s}（x）\的影响.首先，我们发现，在初始$Q_0=1.3$~GeV的尺度下，在全局PDF分析中允许非零的$s_-（x）$，会导致与CT 18 A相似质量的CT 18 A拟合。其次，在CT 18 As\_Lat拟合中包括晶格数据极大地减小了大-$x$区域中的$s_-$-PDF误差带大小。为了进一步减少其误差，需要更精确的晶格数据，扩展到更小的x值。以ATLAS 7 TeV W$和Z$生产数据、SIDIS双μ子生产数据、F3 $结构函数数据、E866 NuSea数据和E906 SeaQuest数据为例，说明了CT 18 As和CT 18 As Lat拟合的意义。以CT 18 As 2和CT18As2\_Lat拟合为结果，分析了PDF比$（s+\bar{s}）/（\bar{u}+\bar{d}）（x）$的参数化依赖性。
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.