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arXiv 1703.01682hep-phhep-ex
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在$ \sqrt s= $ 13 TeV的LHC的孤立瞬发光子产生的预测

Predictions for the isolated prompt photon production at the LHC at $ \sqrt s= $13 TeV

Muhammad Goharipour, Hossein Mehraban

摘要:

强子碰撞中的瞬发光子产生在提供强子的亚结构信息和检验QCD微扰技术方面有着悠久的历史。通过分析瞬发光子产生截面的测量结果,无论是包含重夸克还是与重喷注有关的测量结果,也可以获得关于核子和原子核中部分子密度的一些有价值的信息,特别是胶子的部分子密度。在这项工作中,我们提出了预测的包容性孤立提示光子生产$ pp $碰撞在质心能量为13 TeV,使用各种现代PDF集。的计算都作为一个函数的光子横向能量$ E_\textrm{T}^γ$和赝快度$ η^γ$的ATLAS运动学覆盖。我们还详细研究了由于重整化、因子化和碎裂尺度的变化而引起的截面的理论不确定性。此外,我们还引入并计算了不同快度区的光子动量比,并研究了不同输入PDF对光子动量比的影响。

英文摘要:

The prompt photon production in hadronic collisions has a long history of providing information on the substructure of hadrons and testing the perturbative techniques of QCD. Some valuable information about the parton densities in the nucleon and nuclei, especially of the gluon, can also be achieved by analysing the measurements of the prompt photon production cross section whether inclusively or in association with heavy quarks or jets. In this work, we present predictions for the inclusive isolated prompt photon production in $ pp $ collisions at center-of-mass energy of 13 TeV using various modern PDF sets. The calculations are presented both as a function of photon transverse energy $ E_\textrm{T}^γ$ and pseudorapidity $ η^γ$ for the ATLAS kinematic coverage. We also study in detail the theoretical uncertainty in the cross sections due to the variation of the renormalization, factorization and fragmentation scales. Moreover, we introduce and calculate the ratios of photon momenta for different rapidity regions and study the impact of various input PDFs on such quantity.

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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