arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1912.03215hep-ph
收藏

重新解释charginos的$pp \to W^+W^-$搜索

Reinterpreting $pp \to W^+W^-$ searches for charginos

Antonio Delgado, Adam Martin

备注：
14 pages, 5 figures
发表信息：
Phys. Rev. D 101, 035014 (2020)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

在大型强子对撞机的自然超对称性中寻找电弱子的标志性方法涉及三轻子加丢失能量的末态。这种方法假设一个电弱子质量层次，允许级联衰变导致最终状态的$W^{\pm}Z^0$加上丢失的能量。然而，在某些情况下，这种衰变模式可能不存在，例如电荷伴子是最轻的电弱伴子，而最轻的超对称粒子是引力伴子。在参数空间中出现这种有序的区域，中性伴子/电荷伴子的任何组合的产生都会导致一个$W^+W^- + X$加上能量缺失的终态，其中$X$可能是额外的喷流或轻子。如果$X$是软的，那么所有的中性伴子/电荷伴子产生模式都落入相同的实验终态，即双轻子加上丢失的能量。ATLAS和CMS有轻子$W^+W^-$加上丢失的能量搜索，但他们的解释假设一个光谱组成的一个孤立的带电状态。在本文中，我们确定的情况下，自然超对称模型可以避免$W^{\pm}Z^0$加上丢失的能量界限。对于逃脱$W^{\pm}Z^0$加上缺失能量的场景，我们重新设计最新的ATLAS $W^+W^-$加上缺失能量搜索，考虑到对同一信号有贡献的所有状态。假设最轻的超对称粒子是无质量的，我们发现一个460 GeV的类希格斯诺简并双重束缚。最后，我们扩展我们的论点，一个非超对称的简化模型，包含新的电弱尺度$SU(2)_w$双峰和单峰。

英文摘要：

The hallmark way to search for electroweakinos in natural supersymmetry at the LHC involves the trilepton plus missing energy final state. This approach assumes an electroweakino mass hierarchy that allows for cascade decays leading to a final state of $W^{\pm}Z^0$ plus missing energy. There are, however, situations when that decay pattern may not exist, such as when a chargino is the lightest electroweakino and the lightest supersymmetric particle is the gravitino. In regions of the parameter space where this ordering occurs, the production of any combination of neutralino/chargino leads to a $W^+W^- + X$ plus missing energy final state, where $X$ could be additional jets or leptons. If $X$ is soft, then all neutralino/chargino production modes fall into the same experimental final state, dileptons plus missing energy. ATLAS and CMS have leptonic $W^+W^-$ plus missing energy searches, but their interpretation assumes a spectrum consisting of an isolated charged state. In this paper, we identify the circumstances under which natural supersymmetry models can avoid $W^{\pm}Z^0$ plus missing energy bounds. For scenarios that escape $W^{\pm}Z^0$ plus missing energy, we then recast the latest ATLAS $W^+W^-$ plus missing energy search, taking into account all the states that contribute to the same signal. Assuming the lightest supersymmetric particle is massless, we find a bound of 460 GeV for a higgsino-like degenerate doublet. Finally, we extend our arguments to a non-supersymmetric simplified model containing new electroweak-scale $SU(2)_w$ doublets and singlets.

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。

↑