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arXiv 1903.02583hep-ph
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用BHPS方法计算质子的部分子分布函数和内禀粲含量

Parton distribution functions and constraints on the intrinsic charm content of the proton using BHPS approach

H. Abdolmaleki, A. Khorramian

摘要:

在这项工作中,一组新的部分子分布函数考虑到本征魅力(IC)的贡献。我们专注于大$x$魅力结构函数的EMC测量的影响,作为最有力的证据,结合HERA,SLAC和BCDMS数据的内在魅力。本文的主要目标是同时确定内禀粲概率${P}_{c{\bar c/p}}$和强耦合$α_s$。这使我们能够研究这两个量的相互作用,以及在IC贡献的存在下对PDF的影响。通过考虑$α_s$(固定参数和自由参数),我们发现,虽然提取的PDF中心值及其不确定度没有显著变化,但得到的${P}_{c{\bar c/p}}$值变化了7.8倍。在QCD分析中提取的${P}_{c{\bar c/p}}$值与最近报道的首次由LHC测量得到的$1.93\%$上限值一致。我们发现内禀粲几率对强耦合常数和粲质量都很敏感。在非线性光学条件下,强耦合常数$α_s(M_Z^2) = 0.1191 \pm 0.0008$的提取值与世界平均值和现有的理论模型符合得很好。

英文摘要:

In this work, a new set of parton distribution functions taking into account the intrinsic charm (IC) contribution is presented. We focus on the impact of the EMC measurements on the large $x$ charm structure function as the strongest evidence for the intrinsic charm when combined with the HERA, SLAC and BCDMS data. The main goal of this paper is the simultaneous determination of the intrinsic charm probability ${P}_{c{\bar c/p}}$ and strong coupling $α_s$. This allows us to study the interaction of these two quantities as well as the influence on the PDFs in the presence of IC contributions. By considering $α_s$ which can be fix or free parameter from our QCD analysis, we find that although there is not a significant change in the extracted central value of PDFs and their uncertainties, the obtained value of ${P}_{c{\bar c/p}}$ change by factor 7.8\%. The extracted value of ${P}_{c{\bar c/p}}$ in the present QCD analysis is consistent with the recent reported upper limit of $1.93\%$, which is obtained for the first time from LHC measurements. We show the intrinsic charm probability is sensitive to the strong coupling constant and also the charm mass. The extracted value of the strong coupling constant $α_s(M_Z^2) = 0.1191 \pm 0.0008$ at NLO is in good agreement with world average value and available theoretical models.

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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