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首页> 外文期刊>Physical review, D >Parton distribution functions and constraints on the intrinsic charm content of the proton using the Brodsky-Hoyer-Peterson-Saka approach
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Parton distribution functions and constraints on the intrinsic charm content of the proton using the Brodsky-Hoyer-Peterson-Saka approach

机译：使用Brodsky-Hoyer-Peterson-Saka方法的Parton分布函数和质子固有魅力内容的约束

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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 European Muon Collaboration (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 c ˉ / 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 c ˉ / p change by factor 7.8%. The extracted value of P c c ˉ / 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 ± 0.0008 at NLO is in good agreement with the world average value and available theoretical models.
机译：在这项工作中，提出了一组新的parton分布函数，其中考虑了内在魅力（IC）的贡献。我们将重点放在欧洲Muon协作（EMC）测量对大型x魅力结构功能的影响上，这是结合HERA，SLAC和BCDMS数据得出的固有魅力的最有力证据。本文的主要目的是同时确定固有魅力概率P c c P / p和强耦合αs。这使我们能够研究这两个量的相互作用以及在存在IC贡献的情况下对PDF的影响。通过从QCD分析中考虑可以是固定参数或自由参数的αs，我们发现尽管PDF的提取中心值及其不确定性没有显着变化，但P ccˉ/ p的获得值却变化了7.8。 ％。在当前的QCD分析中，P c cˉ/ p的提取值与最近报道的上限1.93％一致，该上限是从LHC测量中首次获得的。我们证明了固有的魅力概率对强耦合常数和魅力质量都敏感。 NLO处的强耦合常数αs（M Z 2）= 0.1191±0.0008的提取值与世界平均值和可用的理论模型高度吻合。

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