论文标题
在高质量Dilepton最终状态中搜索具有Atlas探测器的新的非共鸣现象
Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector
论文作者
论文摘要
提出了在2 TEV以上的质量范围内的DIELECTRON和DIMUON最终状态中对具有非共鸣信号的新物理学的搜索。这是在LHC的Dilepton最终状态中首次搜索非共鸣信号以使用数据的背景估计。与质子 - 普罗顿碰撞中的Atlas实验记录了$ \ sqrt {s} = 13 $ tev在运行2个大型Hadron Collider的2 $ \ sqrt {s} = 13 $ tev的质子 - 质子碰撞中，Atlas实验在Proton-Proton碰撞中记录了对应于139 fb $^{-1} $的集成光度的数据。基准信号签名是两夸克和两级接触的相互作用，这将在TEV质量尺度上提高DILEPTON事件率。为了模拟背景过程的贡献，功能形式适合在关注区域以下质量区域的数据中的DILEPTON不变质量光谱。然后将其外推到高质量信号区域，以获得那里的预期背景。在数据中没有观察到与预期背景的显着偏差。为涉及新物理的过程的事件数量和可见的横截面分支分数的上限为95％Cl。在接触相互作用量表上观察到（预期）95％Cl下限达到35.8（37.6）TEV。
A search for new physics with non-resonant signals in dielectron and dimuon final states in the mass range above 2 TeV is presented. This is the first search for non-resonant signals in dilepton final states at the LHC to use a background estimate from the data. The data, corresponding to an integrated luminosity of 139 fb$^{-1}$, were recorded by the ATLAS experiment in proton-proton collisions at a center-of-mass energy of $\sqrt{s} = 13$ TeV during Run 2 of the Large Hadron Collider. The benchmark signal signature is a two-quark and two-lepton contact interaction, which would enhance the dilepton event rate at the TeV mass scale. To model the contribution from background processes a functional form is fit to the dilepton invariant-mass spectra in data in a mass region below the region of interest. It is then extrapolated to a high-mass signal region to obtain the expected background there. No significant deviation from the expected background is observed in the data. Upper limits at 95 % CL on the number of events and the visible cross-section times branching fraction for processes involving new physics are provided. Observed (expected) 95 % CL lower limits on the contact interaction energy scale reach 35.8 (37.6) TeV.
