Origins of the isospin violation of dark matter interactions
Origins of the isospin violation of dark matter interactions
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DOI：
10.1088/1475-7516/2013/01/021
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发表时间：
2013
影响因子：
6.4
通讯作者：
Xin Gao;Zhaofeng Kang;Tianjun Li
中科院分区：
文献类型：
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作者：
Xin Gao;Zhaofeng Kang;Tianjun Li
轻暗物质（DM）具有大的DM-核子自旋无关散射截面，而且还有适当的同位旋破坏（ISV）fn/fp <$−0.7，这可能提供一种方法来理解令人困惑的DM直接检测结果。进一步利用严格的天体物理和对撞机约束，我们首先通过一般算符分析，进一步通过指定三种类型的介质：来自手征U（1）X的光Z′，近似的旁观者Higgs二重态（它可以同时解释W+jj异常）和色三重态，系统地研究了ISV的起源.此外，虽然来自奇异的U（1）X与U（1）Y混合的Z′只产生fn = 0，但我们可以将它与传统的希格斯粒子联合收割机结合，以获得适当的ISV。作为一个具体的例子，我们提出了U（1）X模型，其中U（1）X带电轻中微子是一个非弹性DM，它主要湮灭到轻暗态，如Z′，具有亚GeV的质量。该模型可以一致地（与其他DM直接检测结果）和安全地解释最近的GoGeNT年度调制结果。
Light dark matter (DM) with a large DM-nucleon spin-independent scattering cross section and moreover proper isospin violation (ISV) fn/fp ≈ −0.7 may provide a way to understand the confusing DM direct detection results. Further using the stringent astrophysical and collider constraints, we systematically investigate the origin of ISV first via general operator analyses and further via specifying three types of mediators: a light Z′ from chiral U(1)X, an approximate spectator Higgs doublet (It can explain the W+jj anomaly simultaneously) and color triplets. In addition, although Z′ from an exotic U(1)X mixing with U(1)Y generates only fn = 0, we can combine it with the conventional Higgs to achieve the proper ISV. As a concrete example, we propose the U(1)X model where the U(1)X charged light sneutrino is an inelastic DM, which dominantly annihilates to light dark states such as Z′ with sub-GeV mass. The model can consistently (with other DM direct detection results) and safely interpret the recent GoGeNT annual modulation result.