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arXiv 2009.08635hep-phhep-ex
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面对暗物质探测限制的电弱相变

Electroweak phase transition confronted with dark matter detection constraints

Cheng-Wei Chiang, Da Huang, Bo-Qiang Lu

摘要:

我们在实单重态和复单重态扩展下研究了第二类一阶电弱相变和暗物质(DM)现象。在真正的单态扩展与$\mathbb{Z}_2$对称性,我们表明,有利于相变的参数区域遭受DM直接检测的强约束,使只有一个可以忽略不计的部分($f_{X}\sim 10^{-4}-10^{-5}$)DM组成的真正的单态标量可以生存的LUX和XENON 1 T的约束。在复杂的单重态$S$的情况下,我们施加一个$CP$对称性$S\to S^{*}$的标量势。由于$CP$对称性的保护,$S$的实部可以与SM希格斯玻色子混合,而虚部则成为DM候选者。考虑到目前的实验约束的不可见希格斯衰变,希格斯信号强度测量,和暗物质的检测,我们发现,存在一个大的参数空间的II型电弱相变发生,同时解释所有的暗物质遗迹密度。我们确定了一个子集的参数空间,是有前途的未来的实验,包括双希格斯和希格斯信号强度测量在HL-LHC和暗物质直接检测的XENONNT项目。

英文摘要:

We study the type-II first-order electroweak phase transition and dark matter (DM) phenomenology in both real and complex singlet extensions of SM. In the real singlet extension with a $\mathbb{Z}_2$ symmetry, we show that the parameter regions favored by the phase transition suffer from strong constraints from DM direct detection so that only a negligible fraction ($f_{X}\sim 10^{-4}-10^{-5}$) of DM composed of the real singlet scalar can survive the LUX and XENON1T constraints. In the complex singlet $S$ case, we impose a $CP$ symmetry $S\to S^{*}$ to the scalar potential. The real component of $S$ can mix with SM Higgs boson while the imaginary component becomes a DM candidate due to the protection of the $CP$ symmetry. By taking into account the current experimental constraints of invisible Higgs decays, Higgs signal strength measurements, and dark matter detections, we find that there exists a large parameter space for the type-II electroweak phase transition to occur while explaining all of the dark matter relic density. We identify a subset of parameter space that is promising for future experiments, including the di-Higgs and Higgs signal strength measurements at the HL-LHC and the dark matter direct detection in the XENONnT project.

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