A model of electroweakly interacting non-abelian vector dark matter
A model of electroweakly interacting non-abelian vector dark matter
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DOI：
10.1007/jhep07(2020)136
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发表时间：
2020-04
影响因子：
5.4
通讯作者：
T. Abe;Motoko Fujiwara;J. Hisano;K. Matsushita
中科院分区：
文献类型：
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作者：
T. Abe;Motoko Fujiwara;J. Hisano;K. Matsushita
我们提出了一个电弱相互作用的自旋为1的暗物质（DM）模型。将电弱规范对称SU (2) lx U (1) Y扩展为SU (2) 0× SU (2) 1× SU (2) 2× U (1) Y，得到了SU(2) 0和SU(2) 2交换的离散对称。这种离散对称稳定了DM候选。自旋为1的DM粒子（v0）及其SU (2) L伙伴（V±）与标准模型（SM）电弱规范玻色子相互作用，没有任何抑制因子。因此，DM粒子对在早期宇宙中有效地湮灭成SM粒子，DM能量密度的测量值很容易通过热冻结机制实现。该模型还预测了可见扇区的重矢量三重态（W′±和Z′）。它们有助于DM湮灭过程。Z′和v0的质量比决定了各种耦合的值，对W′和Z′的约束限制了DM物理可行的参数空间区域。我们研究了标量和规范耦合的微扰统一性、希格斯信号强度、大型强子对撞机的W '搜索和DM直接探测实验的约束。发现v0的残余丰度解释了3tev19 TeV的DM能量密度是合适的。
We propose an electroweakly interacting spin-1 dark matter (DM) model. The electroweak gauge symmetry, SU (2) L× U (1) Y, is extended into SU (2) 0× SU (2) 1× SU (2) 2× U (1) Y. A discrete symmetry exchanging SU (2) 0 and SU (2) 2 is imposed. This discrete symmetry stabilizes the DM candidate. The spin-1 DM particle (V 0) and its SU (2) L partners (V±) interact with the Standard Model (SM) electroweak gauge bosons without any suppression factors. Consequently, pairs of DM particles efficiently annihilate into the SM particles in the early universe, and the measured value of the DM energy density is easily realized by the thermal freeze-out mechanism. The model also predicts a heavy vector triplet (W′±and Z′) in the visible sector. They contribute to the DM annihilation processes. The mass ratio of Z′ and V 0 determines values of various couplings, and constraints on W′ and Z′ restrict regions of the parameter space that are viable for DM physics. We investigate the constraints from perturbative unitarity of scalar and gauge couplings, the Higgs signal strength, W′ search at the LHC, and DM direct detection experiments. It is found that the relic abundance of V 0 explains the right amount of the DM energy density for 3 TeV19 TeV.