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arXiv 1708.06283hep-ph
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NLO QCD使用Sherpa对$Z+γ$ +喷气机生产的预测

NLO QCD predictions for $Z+γ$ + jets production with Sherpa

Johannes Krause, Frank Siegert

摘要:

我们提出了精确的预测与一个$Z$玻色子和喷流的即时光子生产。它们是在夏尔巴人框架内作为一个一贯合并的包容性样本获得的。计算中完全考虑了$Z$玻色子的轻子衰变以及所有的壳外效应。虚拟矩阵元素由OpenLoops提供,部分子簇射效应用偶极部分子簇射模拟。由于非线性光学QCD校正包括不仅为包容性$Zγ$生产,但也为$Zγ$ + 1喷流过程中,我们发现显着降低系统的不确定性和非常好的协议与实验测量$\sqrt{s}=8$ TeV。预测在$\sqrt{s}=13$ TeV显示,包括理论的不确定性研究。考虑到这些模拟在LHC实验中的应用,我们详细讨论了与$Z$ +喷流终态模拟的必要结合。除了相应的处方外,我们还介绍了推荐的交叉检查,以避免在两个样本之间的重叠去除过程中出现常见的陷阱。

英文摘要:

We present precise predictions for prompt photon production in association with a $Z$ boson and jets. They are obtained within the Sherpa framework as a consistently merged inclusive sample. Leptonic decays of the $Z$ boson are fully included in the calculation with all offshell effects. Virtual matrix elements are provided by OpenLoops and parton shower effects are simulated with a dipole parton shower. Thanks to the NLO QCD corrections included not only for inclusive $Zγ$ production but also for the $Zγ$ + 1-jet process we find significantly reduced systematic uncertainties and very good agreement with experimental measurements at $\sqrt{s}=8$ TeV. Predictions at $\sqrt{s}=13$ TeV are displayed including a study of theoretical uncertainties. In view of an application of these simulations within LHC experiments, we discuss in detail the necessary combination with a simulation of the $Z$ + jets final state. In addition to a corresponding prescription we introduce recommended cross checks to avoid common pitfalls during the overlap removal between the two samples.

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