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首页> 外文期刊>Physical review, D >Nonminimal dark sectors: Mediator-induced decay chains and multijet collider signatures
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Nonminimal dark sectors: Mediator-induced decay chains and multijet collider signatures

机译：非生物黑暗部门：介质诱导的衰减链和多jet撞机签名

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摘要

A preponderance of astrophysical and cosmological evidence indicates that the universe contains not only visible matter but also dark matter. In order to suppress the couplings between the dark and visible sectors, a standard assumption is that these two sectors communicate only through a mediator. In this paper we make a simple but important observation: if the dark sector contains multiple components with similar quantum numbers, then this mediator also generically gives rise to dark-sector decays, with heavier dark components decaying to lighter components. This in turn can even give rise to relatively long dark decay chains, with each step of the decay chain also producing visible matter. The visible byproducts of such mediator-induced decay chains can therefore serve as a unique signature of such scenarios. In order to investigate this possibility more concretely, we examine a scenario in which a multicomponent dark sector is connected through a mediator to Standard-Model quarks. We then demonstrate that such a scenario gives rise to multijet collider signatures, and we examine the properties of such jets at both the parton and detector levels. Within relatively large regions of parameter space, we find that such multijet signatures are not excluded by existing monojet and multijet searches. Such decay cascades therefore represent a potential discovery route for multicomponent dark sectors at current and future colliders.
机译：Astrophysical和宇宙学证据的优势表明宇宙不仅含有可见的物质，而且含有暗物质。为了抑制暗和可见部门之间的耦合，标准假设是这两个扇区仅通过介体通信。在本文中，我们做出了一个简单但重要的观察：如果暗部门包含具有类似量子数的多个组件，那么该介体也经过覆盖的暗部衰变，衰减较轻的组件。这反过来甚至可以产生相对较长的黑暗衰变链，衰减链的每个步骤也产生可见的物质。因此，这种介体诱导的衰减链的可见副产物可以作为这种情况的独特签名。为了更具体地研究这种可能性，我们研究了一种情况，其中多组分暗部门通过中介到标准模型夸克。然后，我们展示了这样的场景产生了多jet撞机签名，并且我们在Parton和探测器水平中检查这种喷射器的性质。在相对较大的参数空间区域内，我们发现此类多项目签名不会被现有的单速和多jet搜索排除在外。因此，这种衰变级联代表了当前和未来撞机的多组分暗部门的潜在发现路线。

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