Sequential displaced vertices: Novel collider signature for long-lived particles
Sequential displaced vertices: Novel collider signature for long-lived particles
复制标题
连续位移顶点：长寿命粒子的新颖对撞机特征
DOI：
10.1103/physrevd.106.095012
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发表时间：
2022
影响因子：
5
通讯作者：
Thomas, Brooks
中科院分区：
文献类型：
--
作者：
Dienes, Keith R.;Kim, Doojin;Leininger, Tara T.;Thomas, Brooks
在本文中，我们指出了一个新的签名的物理超越标准模型，可能会被观察到在大型强子对撞机（LHC）和未来的对撞机。这个签名，自然出现在许多建议的标准模型的扩展，结果从多个位移的顶点与连续衰变的不稳定，长寿命的粒子沿着相同的衰变链。我们把这样一个置换的顶点序列称为“顶点”。我们研究了在大型强子对撞机上观察不倒翁的前景，并评估了在何种程度上可以区分新物理学的其他签名，其中也涉及多个位移顶点在同一对撞机事件。作为这种分析的一部分，我们还开发了一个程序，用于重建相应衰变链中所涉及的粒子的质量和寿命。我们发现，发现和区分不倒翁的前景，可以大大提高利用精确的定时信息，如将提供的CMS定时层在高光度LHC。因此，我们的分析提供了强大的额外的动机，继续努力，以提高对撞机探测器在LHC及以后的计时能力。
In this paper, we point out a novel signature of physics beyond the Standard Model which could potentially be observed both at the Large Hadron Collider (LHC) and at future colliders. This signature, which emerges naturally within many proposed extensions of the Standard Model, results from the multiple displaced vertices associated with the successive decays of unstable, long-lived particles along the same decay chain. We call such a sequence of displaced vertices a “tumbler.” We examine the prospects for observing tumblers at the LHC and assess the extent to which tumbler signatures can be distinguished from other signatures of new physics which also involve multiple displaced vertices within the same collider event. As part of this analysis, we also develop a procedure for reconstructing the masses and lifetimes of the particles involved in the corresponding decay chains. We find that the prospects for discovering and distinguishing tumblers can be greatly enhanced by exploiting precision timing information such as would be provided by the CMS timing layer at the high-luminosity LHC. Our analysis therefore provides strong additional motivation for continued efforts to improve the timing capabilities of collider detectors at the LHC and beyond.