论文标题
用相关的向量玻色子和LHC的质风味射流探测质子结构
Probing the proton structure with associated vector boson and heavy flavor jet production at the LHC
论文作者
论文摘要
我们考虑使用质子中的横向动量依赖性（TMD）Parton密度的两个方案，考虑使用LHC能量在LHC Energies处与重型（魅力和美容）相关的$ Z $玻色子的产生。他们中的第一个采用了Catani-Ciafaloni-Fiorani-Marchesini Gluon进化，并在Monte-Carlo事件发电机Pegasus中实施。在这里，沉重的夸克总是在硬党散射中产生。第二个方案基于Parton分支方法，该方法目前实施到Monte-Carlo事件发生器级联反应中。在这种情况下，生成了$ z $ +喷气机样品，然后选择包含最终状态下重型风味喷气式飞机的事件。我们比较了这两种基于TMD的方法中获得的预测，并研究了它们对质子中TMD Gluon密度的敏感性，并估计来自Parton阵雨和双Parton散射机制的影响。此外，我们将我们的预测与以NLO准确性执行的传统（共线）PQCD计算结果进行了比较。结果表明，基于TMD的结果与以$ \ sqrt s = 8 $和$ 13 $ TEV收集的LHC实验数据一致。我们讨论了可观察到对质子中夸克分布的敏感性，并提出预测，以在即将进行的LHC实验数据分析中搜索固有的魅力信号。
We consider the production of $Z$ bosons associated with heavy (charm and beauty) jets at the LHC energies using two scenarios based on the transverse momentum dependent (TMD) parton densities in a proton. The first of them employs the Catani-Ciafaloni-Fiorani-Marchesini gluon evolution and is implemented in the Monte-Carlo event generator PEGASUS. Here, the heavy quarks are always produced in the hard partonic scattering. The second scheme is based on the parton branching approach, currently implemented into the Monte-Carlo event generator CASCADE. In this scenario, the $Z$ + jets sample is generated and then events containing the heavy flavor jet in a final state are selected. We compare the predictions obtained within these two TMD-based approaches to each other, investigate their sensitivity to the TMD gluon densities in a proton and estimate the effects coming from parton showers and double parton scattering mechanism. Additionally, we compare our predictions with the results of traditional (collinear) pQCD calculations performed at NLO accuracy. It is shown that the TMD-based results agree with the LHC experimental data collected at $\sqrt s = 8$ and $13$ TeV. We discuss the sensitivity of observables to the quark distributions in a proton and present predictions to search for the intrinsic charm signal in forthcoming analyses of the LHC experimental data.
