Detecting a boosted diboson resonance
Detecting a boosted diboson resonance
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DOI：
10.1007/jhep11(2018)027
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发表时间：
2018-09
影响因子：
5.4
通讯作者：
K. Agashe;J. Collins;P. Du;Sungwoo Hong;Doojin Kim;Rashmish K. Mishra
中科院分区：
文献类型：
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作者：
K. Agashe;J. Collins;P. Du;Sungwoo Hong;Doojin Kim;Rashmish K. Mishra
新的轻标量粒子在数百GeV的质量范围内，衰变成一对W/Z玻色子，可以出现在SM的几个扩展中。对撞机研究这种标量的重点通常是直接产生标量，其中标量通常只是轻微增强。因此，观测到的W/Z被很好地分离，允许以低质量二色子共振的标准方式对标量共振进行分析。在这项工作中，我们转而关注标量的直接产生被抑制的情况，它是通过一个明显更重（几TeV质量）的新粒子与SM粒子结合的衰变产生的。这样的过程导致标量被高度提升，使其衰变产生的W/Z合并。这种衰变的最终状态是一个“胖”喷流，它可以是四个分叉的（对于完全强子W/Z衰变），或者可能像W/Z射流一样，但是里面有轻子（如果W/Z中的一个轻子衰变）。此外，这种胖喷流的喷流质量可能与W/Z/希格斯/顶夸克引起的喷流大不相同，可能会被现有的搜索所遗漏。在这项工作中，我们开发了专门的算法，用于在大型强子对撞机上标记这种多层“增强二色子”。作为一个具体应用，我们讨论了标准翘曲额外维度框架的扩展，其中可以出现这样一个轻标量。我们证明，使用这些算法可以在质量范围内提供灵敏度，否则约束很差。
New light scalar particles in the mass range of hundreds of GeV, decaying into a pair of W/Z bosons can appear in several extensions of the SM. The focus of collider studies for such a scalar is often on its direct production, where the scalar is typically only mildly boosted. The observed W/Z are therefore well-separated, allowing analyses for the scalar resonance in a standard fashion as a low-mass diboson resonance. In this work we instead focus on the scenario where the direct production of the scalar is suppressed, and it is rather produced via the decay of a significantly heavier (a few TeV mass) new particle, in conjunction with SM particles. Such a process results in the scalar being highly boosted, rendering the W/Z’s from its decay merged. The final state in such a decay is a “fat” jet, which can be either four pronged (for fully hadronic W/Z decays), or may be like a W/Z jet, but with leptons buried inside (if one of the W/Z decays leptonically). In addition, this fat jet has a jet mass that can be quite different from that of the W/Z/Higgs/top quark-induced jet, and may be missed by existing searches. In this work, we develop dedicated algorithms for tagging such multi-layered “boosted dibosons” at the LHC. As a concrete application, we discuss an extension of the standard warped extra dimensional framework where such a light scalar can arise. We demonstrate that the use of these algorithms gives sensitivity in mass ranges that are otherwise poorly constrained.