Probing squeezed bino-slepton spectra with the Large Hadron Collider
Probing squeezed bino-slepton spectra with the Large Hadron Collider
复制标题
使用大型强子对撞机探测压缩双子轻子光谱
DOI：
10.1103/physrevd.96.075037
复制
发表时间：
2017
影响因子：
5
通讯作者：
Walker, Joel W.
中科院分区：
文献类型：
--
作者：
Dutta, Bhaskar;Fantahun, Kebur;Fernando, Ashen;Ghosh, Tathagata;Kumar, Jason;Sandick, Pearl;Stengel, Patrick;Walker, Joel W.
我们考虑了一个最小超对称标准模型场景，其中唯一的轻超粒子是一个类双星的暗物质候选者和一个近乎简并的斯普顿。在大型强子对撞机(LHC)上探索这一场景是出了名的困难，因为轻子对产生过程产生的最终状态是软轻子和丢失的小横向能量。我们在参数空间中研究了这一情形，其中最轻的中性子和最轻的斯普顿之间的质量差()为()，重点讨论了额外的辐射喷流为斯普顿对提供横向助推的过程。然后，我们利用轻子之间的角分离以及轻子与丢失的横向能量的角分离，以及喷流和丢失的横向能量之间的角分离，来区分信号和背景事件。我们还使用了重构的迪托质量，变量，对于更大的轻子，则使用轻子的下限。这些切割可以极大地提高信号灵敏度和信号背景比，允许在大型强子对撞机上以合理的综合光度在参数空间的感兴趣区域发现。使用我们的搜索策略，大型强子对撞机将能够排除具有积分光度的mμ˜≈200 GeV。虽然我们关注的是一个特定的模型，但结果推广到各种情况，其中暗物质和轻子伙伴质量几乎简并，特别是具有标量介体的情况。
We consider a minimal supersymmetric Standard Model scenario in which the only light superparticles are a binolike dark matter candidate and a nearly degenerate slepton. It is notoriously difficult to probe this scenario at the Large Hadron Collider (LHC), because the slepton pair-production process yields a final state with soft leptons and small missing transverse energy. We study this scenario in the region of parameter space where the mass difference between the lightest neutralino and the lightest slepton () is, focusing on the process in which an additional radiated jet provides a transverse boost to the slepton pair. We then utilize the angular separation of the leptons from each other and from the missing transverse energy, as well as the angular separation between the jet and the missing transverse energy, to distinguish signal from background events. We also use the reconstructed ditau mass, thevariable, and for larger, a lower bound on the lepton. These cuts can dramatically improve both signal sensitivity and the signal-to-background ratio, permitting discovery at the LHC with reasonable integrated luminosity over the interesting region of parameter space. Using our search strategy the LHC will be able to exclude mμ˜≈200 GeV foratwithof integrated luminosity. Although we focus on a particular model, the results generalize to a variety of scenarios in which the dark matter and a leptonic partner are nearly degenerate in mass, and especially to scenarios featuring a scalar mediator.