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arXiv 2103.13776hep-ph
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改进的基于BHPS模型的全局分析奇异分布函数的确定

Improved determination of strange distribution function from the global analysis using BHPS model

Maral Salajegheh, S. Mohammad Moosavi Nejad, S. Atashbar Tehrani

备注：
12 pages, 5 figs , 2 tables
发表信息：
Few-Body Syst. (2021) 62:16
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摘要：

考虑到大量的实验数据，研究了核子海的内禀奇异（IS）分量对部分子分布函数（PDF）整体分析的影响。为了这个目的，我们考虑两种情况的基础上BHPS模型结果的IS分布。在第一种情况下，我们应用BHPS模型的结果，在第二种情况下，我们使用其演变的分布。对于每种情况，我们在$ 1σ$和$ 4σ$水平给出了标准公差标准$ Δχ^2=1 $和$ 18.112 $的IS概率$ {\cal P}_5^{s\bar{s}} $的限值。我们的研究结果表明，实验数据可以容忍一个IS组件具有更大的概率$ {\cal P}_5^{s\bar{s}} $，如果采用第二种情况。我们在$ 4σ$水平上分别获得了$ Δχ^2=1 $和$18.112$的$ {\cal P}_5^{s\bar{s}}\approx 0.01 $和$ {\cal P}_5^{s\bar{s}}\approx 0.025 $。我们还计算了质子中包含和不包含IS分量的奇异海夸克密度与轻海夸克密度之比$r_s$。我们的研究结果表明，如果包括IS组分，则可以获得更高的比率$r_s$值。

英文摘要：

We study the impact of intrinsic strange (IS) component of nucleon sea on the global analysis of parton distribution functions (PDFs) considering a wide range of experimental data. To this aim, we consider two scenarios on the basis of BHPS model results for the IS distribution. In the first scenario, we apply the results presented through the BHPS model and in the second scenario we use its evolved distributions. For each scenarios, we present the limit of the IS probability $ {\cal P}_5^{s\bar{s}} $ for the standard tolerance criteria $ Δχ^2=1 $ and $ 18.112 $ at $ 1σ$ and $ 4σ$ levels. Our results show that the experimental data can tolerate an IS component with a greater probability $ {\cal P}_5^{s\bar{s}} $ if one employs the second scenario. We obtain $ {\cal P}_5^{s\bar{s}}\approx 0.01 $ and $ {\cal P}_5^{s\bar{s}}\approx 0.025 $ for $ Δχ^2=1 $ and $18.112$, respectively, at the $ 4σ$ level. We also calculate the ratio of strange-to-light sea-quark densities $r_s$ in the proton both including and excluding the IS component. Our results show that one can obtain a higher value for the ratio $r_s$ if the IS component is included.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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