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首页> 外文期刊>Physical review, D >Dedicated strategies for triboson signals from cascade decays of vector resonances
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Dedicated strategies for triboson signals from cascade decays of vector resonances

机译：矢量谐振级联衰减产生的摩擦信号的专用策略

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New colorless electroweak (EW) charged spin-1 particles with mass of a few TeV arise in numerous extensions of the standard model (SM). Decays of such a vector into a pair of SM particles, either fermions or EW bosons, are well studied. Many of these models have an additional scalar, which can lead to (and even dominate in certain parameter regions) a novel decay channel for the heavy vector particles instead—into a SM EW boson and the scalar, which subsequently decays into a SM EW boson pair. In this work, we focus on the scalar being relatively heavy, roughly a factor of 2 lighter than the vector particles, rendering its decay products well separated. Such a cascade decay results in a final state with three isolated bosons. We argue that for this “triboson” signal the existing diboson searches are not quite optimal due to combinatorial ambiguity for three identical bosons, and in addition, due to a relatively small signal cross section determined by the heaviness of the decaying vector particle. In order to isolate the signal, we demonstrate that tagging all three bosons, followed by use of the full triboson invariant mass distribution as well as that of appropriate subsets of dibosons, is well motivated. We develop these general strategies in detail within the context of a specific class of models that are based on extensions of the standard warped extradimensional scenario. We also point out that a similar analysis would apply to models with an enlarged EW gauge sector in four dimensions, even if they involve a different Lorentz structure for the relevant couplings.
机译：在标准模型（SM）的众多扩展中，出现了质量为几个TeV的新型无色电弱（EW）带电的spin-1粒子。已经很好地研究了将这种矢量分解为一对SM粒子（费米子或EW玻色子）的衰减。这些模型中的许多模型都有一个附加的标量，可以导致（甚至在某些参数区域中占主导地位）一个用于重矢量粒子的新颖衰减通道-变成SM EW玻色子和标量，随后衰减成SM EW玻色子对。在这项工作中，我们关注标量相对较重，大约比矢量粒子轻2倍的标量，从而使其衰减乘积得到很好的分离。这种级联衰减导致最终状态具有三个孤立的玻色子。我们认为，对于这种“ triboson”信号，由于三个相同玻色子的组合模糊性，并且由于衰减矢量粒子的沉重决定了相对较小的信号横截面，因此现有的diboson搜索不是十分理想。为了隔离信号，我们证明了对所有三个玻色子进行标记，然后再使用完整的Triboson不变质量分布以及适当的Diboson子集，是有充分动机的。我们将在基于标准扭曲超维场景扩展的特定类模型的上下文中详细开发这些通用策略。我们还指出，即使在相关联轴器涉及不同的Lorentz结构的情况下，类似的分析也将适用于在四个维度上具有更大EW规扇区的模型。

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