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arXiv 1609.09079hep-phastro-ph.CO
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终于（Finally！排除Z和Higgs介导的暗物质模型

Toward (Finally!) Ruling Out Z and Higgs Mediated Dark Matter Models

Miguel Escudero, Asher Berlin, Dan Hooper, Meng-Xiang Lin

备注：
Corrected an error on the relic abundance curves in the high mass region for the Z mediated models and for fermionic dark matter mediated by the Higgs. Some figures changed accordingly. Conclusions remain unchanged but for the case of a fermionic dark matter with purely axial couplings to the Z. References added
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摘要：

近年来，直接探测、间接探测和对撞机实验对粒子暗物质施加了越来越严格的限制，探索了与WIMP范式相关的大部分参数空间。在本文中，我们专注于WIMP模型的子集，其中暗物质湮灭在早期宇宙通过耦合到标准模型$Z$或标准模型希格斯玻色子。考虑到费米，标量和矢量暗物质的候选人在一个模型无关的背景下，我们发现，这些暗物质候选人的绝大多数已经排除了现有的实验。在$Z$介导的暗物质的情况下，目前唯一没有被排除的情况是，暗物质是费米子，具有轴向耦合，质量在$Z$共振（$m_{\rm DM} \simeq m_Z/2$）的几个GeV内或大于200 GeV，或者具有矢量耦合和$m_{\rm DM} > 6$ TeV。如果暗物质的质量接近希格斯极（$m_{\rm DM} \simeq m_H/2$），那么目前有几种希格斯介导的情况是可行的。否则，唯一不被排除的情况是暗物质是一个重于400 GeV（1160 GeV）的标量（矢量），并与希格斯门耦合，或者是一个与标准模型希格斯玻色子耦合的赝标量（CP破坏）的费米子。除了暗物质与希格斯玻色子的纯赝标量耦合外，预计计划中的直接探测实验将探测本研究中考虑的几乎整个模型范围。

英文摘要：

In recent years, direct detection, indirect detection, and collider experiments have placed increasingly stringent constraints on particle dark matter, exploring much of the parameter space associated with the WIMP paradigm. In this paper, we focus on the subset of WIMP models in which the dark matter annihilates in the early universe through couplings to either the Standard Model $Z$ or the Standard Model Higgs boson. Considering fermionic, scalar, and vector dark matter candidates within a model-independent context, we find that the overwhelming majority of these dark matter candidates are already ruled out by existing experiments. In the case of $Z$ mediated dark matter, the only scenarios that are not currently excluded are those in which the dark matter is a fermion with an axial coupling and with a mass either within a few GeV of the $Z$ resonance ($m_{\rm DM} \simeq m_Z/2$) or greater than 200 GeV, or with a vector coupling and with $m_{\rm DM} > 6$ TeV. Several Higgs mediated scenarios are currently viable if the mass of the dark matter is near the Higgs pole ($m_{\rm DM} \simeq m_H/2$). Otherwise, the only scenarios that are not excluded are those in which the dark matter is a scalar (vector) heavier than 400 GeV (1160 GeV) with a Higgs portal coupling, or a fermion with a pseudoscalar (CP violating) coupling to the Standard Model Higgs boson. With the exception of dark matter with a purely pseudoscalar coupling to the Higgs, it is anticipated that planned direct detection experiments will probe nearly the entire range of models considered in this study.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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