NLO+NLL squark and gluino production cross sections with threshold-improved parton distributions.
NLO+NLL squark and gluino production cross sections with threshold-improved parton distributions.
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NLO+nll squark和Gluino生产截面具有阈值改良的Parton分布。
DOI：
10.1140/epjc/s10052-016-3892-4
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Rojo J
中科院分区：
文献类型：
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作者：
Beenakker W;Borschensky C;Krämer M;Kulesza A;Laenen E;Marzani S;Rojo J
我们提出了在LHC运行II中对夸克和胶子产生对的截面的最新预测。首先，利用NNPDF3.0NLO全局分析，对基于NLO+NLL部分子截面的计算进行了更新。本研究包括从高阶、pdf和强耦合的理论不确定性的充分表征。然后，我们探讨了NLO+NLL阈值恢复对最近NNPDF3.0 pdf计算的影响。我们发现，阈值改进后的pdf引起的结果偏移在基于NLO pdf计算的总理论不确定性范围内。然而，我们也观察到NLO+NLL截面的中心值在定性和定量上都得到了修改，这说明了阈值改进的pdf和恢复的部分子截面的相关性和影响。基于NNPDF3.0NLO的更新的NLO+NLL截面以NLL-fast格式公开提供，应该是解释Run II超对称粒子搜索的重要组成部分。
We present updated predictions for the cross sections for pair production of squarks and gluinos at the LHC Run II. First of all, we update the calculations based on NLO+NLL partonic cross sections by using the NNPDF3.0NLO global analysis. This study includes a full characterization of theoretical uncertainties from higher orders, PDFs and the strong coupling. Then we explore the implications for this calculation of the recent NNPDF3.0 PDFs with NLO+NLL threshold resummation. We find that the shift in the results induced by the threshold-improved PDFs is within the total theory uncertainty band of the calculation based on NLO PDFs. However, we also observe that the central values of the NLO+NLL cross sections are modified both in a qualitative and a quantitative way, illustrating the relevance and impact of using threshold-improved PDFs together with resummed partonic cross sections. The updated NLO+NLL cross sections based on NNPDF3.0NLO are publicly available in the NLL-fast format, and should be an important ingredient for the interpretation of the searches for supersymmetric particles at Run II.