Nonminimal dark sectors: Mediator-induced decay chains and multijet collider signatures
Nonminimal dark sectors: Mediator-induced decay chains and multijet collider signatures
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DOI：
10.1103/physrevd.101.075024
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发表时间：
2019-10
影响因子：
5
通讯作者：
K. Dienes;Doojin Kim;Huayang Song;S. Su;B. Thomas;David Yaylali
中科院分区：
文献类型：
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作者：
K. Dienes;Doojin Kim;Huayang Song;S. Su;B. Thomas;David Yaylali
大量的天体物理学和宇宙学证据表明，宇宙不仅包含可见物质，而且包含暗物质。为了抑制暗扇区和可见扇区之间的耦合，一个标准的假设是这两个扇区仅通过中介进行通信。在本文中，我们做了一个简单但重要的观察：如果暗扇区包含多个具有相似量子数的分量，那么这个介质也会产生暗扇区衰变，较重的暗分量会衰变为较轻的分量。这反过来甚至可以产生相对较长的暗衰变链，衰变链的每一步也会产生可见物质。因此，这种介体诱导的衰变链的可见副产物可以作为这种情况的独特特征。为了更具体地研究这种可能性，我们研究了一个场景，其中一个多分量的暗扇区通过中介连接到标准模型夸克。然后，我们证明，这样的情况下产生的多喷对撞机签名，我们检查这样的喷气机在部分子和检测器水平的属性。在相对较大的区域内的参数空间，我们发现，这样的多射流签名不排除现有的单射流和多射流搜索。因此，这种衰变级联代表了在当前和未来对撞机上发现多组分暗区的潜在途径。
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 examine this possibility more concretely, we examine a scenario in which a multi-component dark sector is connected through a mediator to Standard-Model quarks. We then demonstrate that such a scenario gives rise to multi-jet 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 multi-jet signatures are not excluded by existing monojet and multi-jet searches. Such decay cascades therefore represent a potential discovery route for multi-component dark sectors at current and future colliders.